Q.
What is the ratio of the velocity of sound at 4 atmosphere to that at 1 atmosphere?
4 : 1
2 : 1
1 : 2
1 : 1
Explanation:
Q.
Holes can exist in____________________?
Insulators
Semi conductors
Conductors
All of the above
Explanation:
Q.
The mass of Platinum cylinder kept near Paris is________?
None
1 gram
1 Kg
100 Kg
Explanation:
Q.
When fluid is incompressible then________________?
The volume of the fluid is constant
The density of the fluid is constant
The velocity of the fluid is constant
The flow of the fluid is the straight line
Explanation:
Q.
The distance covered by a body in one complete vibration is 20cm. What is the amplitude of body ___________________?
15 cm
7.5 cm
10 cm
5 cm
Explanation:
Q.
How many types of units are in SI ?
3
4
1
2
Explanation:
Q.
If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb________________?
Remains same
Brightness increases
No light
Brightness decreases
Explanation:
Q.
The circumference subtends an angle________________?
? radian
2? radian
4? radian
?/2 radian
Explanation:
Q.
In which quadrant, the only value of tan will be positive ?
Both 1st and 3rd
Second
First
Third
Explanation:
Q.
Which of the following group of forces can produce equilibrium?
12N, 5N, 15N
4N ,2N, 10N
10N, 18N
12N, 5N, 20N
Explanation:
Q.
The waveform of S.H.M. is________________?
Square wave
Sine wave
Standing wave
None
Explanation:
Q.
Which of the following statements is true when we see
The sky remains clear and the sun is at lower position in the sky
We face sun and raindrops
The Sun remains behind us and we face raindrops
In light rainfall, we face Sun
Explanation:
Q.
Three coplanar forces acting on a body keep it in equilibrium. They should therefore be_______________?
Non-concurrent
Non-parallel
Parallel
Concurrent
Explanation:
Q.
The purpose of flywheel in the engines is________________?
to smooth out the energy variation
both A and B
to start engine
to add more weight to engine to work it stable
Explanation:
Q.
Which equation is not dimensionally correct ?
S=Vt2
E=mc2
S=1/2at2
Vf=Vi+at
Explanation:
Q.
Tick the correct statement_________________?
Moderators reflect the neutrons
Moderators absorb the neutrons
Moderators bring the neutrons to rest
Moderators slow down the neutrons
Explanation:
Q.
Dimensional analysis is helpful for__________________?
Deriving a possible formula
Checking the homogeneity of a physical equation
Verification of laws
Only A and B are correct
Explanation:
Q.
The most useful tracer is_________________?
C-14
I-131
Sr-90
CA-41
Explanation:
Q.
The displacement of SHM is written as X = X`sin?t if the displacement is written by X = X? sont then phase constant will be equal to_______________?
90
180
0
45
Explanation:
Q.
If the momentum of an object is increased twice, then what will be the kinetic energy?
Thrice
Sixteen times
Four times
Twice
Explanation:
Q.
Oil rises up to wick in a lamp because_____________?
Oil is volatile
Diffusion of oil through the wick
Oil is very light
Capillary action phenomenon
Explanation:
Q.
If the pressure of a given gas is held constant its density is inversely proportional to its absolute temperature. We can refer it as another statement of______________?
Boyles law
Ideal gas law
Avagadros law
Charles law
Explanation:
Q.
A photon is always considered to be: ________?
Moving with speed of sound
At rest
Moving with speed of light
In accelerated form
Explanation:
Q.
When a body moves in a circle of radius r with linear speed V its centripetal force is_______________?
mV/r
mV2/r
mV/r2
mV2/r2
Explanation:
Q.
Two vectors A and B are making angle ? with each other. The scalar projection of vector B on vector A is written as____________?
Both a and b are correct
A.B/B
A.B/A
A.cos?
Explanation:
Q.
Magnifying power of simple microscope______________?
increase with decrease in focal length
increase with increase in focal length
list distance of distinct vision
no effect with decrease or increase with focal length
Explanation:
Q.
Alpha particles possess greater penetration power than that of beta particles due to its_____________?
Neither greater nor smaller ionization power
Smaller ionization power
Same ionization power
Greater ionization power
Explanation:
Q.
The unit of entropy is________________?
Kgm2/sec2.K
J/K
N.m/sec
J.K
Explanation:
Q.
Area under the curve of velocity-time graph gives_______?
Momentum
Force
Displacement
Acceleration
Explanation:
Q.
An alternating current is represented by the equation I = I?sin?t which of the following equation represents an alternating current of frequency and amplitude twice that of the above current ?
I = I?sin(2?t)
I = 2I?Sin(2?t)
I = 2ISin?t
I = 2I?Sin(?t/2)
Explanation:
Q.
Davison Germer experiment indicates__________________?
Interference
Electron diffraction
Refraction
Polarization
Explanation:
Q.
Ohm is a unit of measuring _________?
None of these
Resistance
Voltage
Current
Explanation:
Q.
A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and the ball goes up to 2 in height further, find the magnitude of the force. Consider g = 10m/s 2
22N
4N
16N
20N
Explanation:
Q.
Absolute uncertainty in a measurement depends upon______________?
All of a, b and C
The magnitude of the measurement
Least count of the instrument
Percentage error in the measurement
Explanation:
Q.
Very weak magnetic fields are detected by___________________?
Squids
Oscilloscope
Magnetometer
Magnetic resonance imaging (MRI)
Explanation:
Q.
The performance of a refrigerator is described by________________?
both A and B
coefficient of performance
not described
efficiency
Explanation:
Q.
A body of 2 kg is suspended from the ceiling of an elevator moving up with an acceleration g. Its apparent weight in the elevator will be______________?
39.2 N
9.8 N
19.6 N
129.4 N
Explanation:
Q.
A simple pendulum suspended from the ceiling of a lift has time period T when the lift is at rest. When the lift falls freely, the time period is_________________?
T/g
Infinite
g/T
Zero
Explanation:
Q.
The operation of a transistor requires______________?
None of the above
That the collector be heated
That the emitter be heated
That the base be heated
Explanation:
Q.
Dimension of pressure is__________________?
ML-2T-2
ML-1T-2
MLT
ML-1T-1
Explanation:
Q.
An alpha particle can produce fluorescence in__________________?
Barium platinocyanide
Calcium tungstate
All of above
ZnS
Explanation:
Q.
Maximum number of rectangular components are_____________?
2
4
3
1
Explanation:
Q.
In an electron microscope, we use energetic particles because of______________?
Wavelength is very short
Kinetic energy is large
Penetrating power is high
All the above reasons
Explanation:
Q.
Electrons present in p-type material due to thermal pair generation are_____________?
dual carriers
minority carriers
blockers
majority carriers
Explanation:
Q.
What is the acceleration of free fall on the moon of that on the Earth ?
1/4th
1/6th
1/8th
None of these
Explanation:
Q.
After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light______________?
Decreases because speed decreases
Remains same
Increases then decrease
Increases because wavelength decreases
Explanation:
Q.
The projection of the particle moving in a circle with non-uniform speed executes ?
Both B and D
Vibratory motion
S.H.M
None S.H.M
Explanation:
Q.
Prefix deca represents_______________?
10 Raised to power -1
10 Raised to power 3
10 Raised to power 2
10 Raised to power 1
Explanation:
Q.
ML-1 T-2 is the dimension of_______________?
Momentum
Pressure
Force
Energy
Explanation:
Q.
The direction of propagation of an electromagnetic waves is________________?
Parallel to electric and magnetic field
Perpendicular to magnetic field
Perpendicular to both electric and magnetic field
Perpendicular to electric field
Explanation:
Q.
The synopsis of Einstein
The faster you move, the heavier you get
The faster you move, the lighter you get
None of the above
The slower you move, the heavier you get
Explanation:
Q.
In which process all the heat supplied is converted into work done ?
isobaric
isochoric
isothermal
isentropic
Explanation:
Q.
The penetrating power of X-rays depends on their______________?
applied voltage
all of the above
source
frequency
Explanation:
Q.
The velocity of a particle of mass m of de-Broglie wavelength ? is______________?
v = 2
v = 2
v = 2
v = 3
Explanation:
Q.
The power is the dot product of ___________ quantities.
Force and time
None of these
Force and velocity
Force and speed
Explanation:
Q.
CFC is used in _________________?
Plastic foam industry
Refrigeration
Aerosol spray
All of above
Explanation:
Q.
Galvanometer is a very sensitive device with______________________?
very high damping
radial field disintegration
no damping at all
very low damping
Explanation:
Q.
A lens which converges a beam of parallel rays to a point is called______________?
diverging (or concave) lens
converging (or convex) lens
plano convex lens
plano concave lens
Explanation:
Q.
The antiparticle of electron is: ______?
Positron
Proton
Meson
Neutron
Explanation:
Q.
The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________?
1T = 10-4 G
1T = 104 G
1T = 10-2 G
1T = 103 G
Explanation:
Q.
Modern system of navigation satellites called ___________?
Proton
Navstar
Inertia frames of reference
None of these
Explanation:
Q.
Dioptre power of an concave lens of 10 cm focal length is_______________?
10 dioptre
1 / 10 dioptre
1 / 10 dioptre
10 dioptre
Explanation:
Q.
The sensitivity of a galvanometer is given by__________________?
BAN/C
CAN/B
ABC/N
C/BAN
Explanation:
Q.
Which of the following properties of molecules of a gas is same for all gases at particular temperature ?
momentum
kinetic energy
velocity
mass
Explanation:
Q.
Antimatter consists of ______________?
Antineutron
All of above
Antiproton
Positron
Explanation:
Q.
How many main frontiers of fundamental science ?
2
1
4
3
Explanation:
Q.
Bracket series is obtained when all transition of electron terminate on_______________?
5th orbit
2nd orbit
3rd orbit
4th orbit
Explanation:
Q.
The density of human blood is nearly equal to____________?
Oil (kerosene)
Mercury
Honey
Water
Explanation:
Q.
A changing magnetic flux produces around itself an induced_______________?
Electric field
Electromagnetic force
Artificial gravitational field
Magnetic field
Explanation:
Q.
The length of the second pendulum is_________________?
99.2 cm
98 cm
99 cm
100 cm
Explanation:
Q.
For confinement of electron in a box of radius 10-14m the electron, speed should be_____________?
Should be greater than the speed of light.
Not be wave-like
Be zero
107m/sec
Explanation:
Q.
An inductive coil has a resistance of 100?. When an AC signal of frequency 1000Hz is fed to the coil the applied voltage leads the current by 45?. What is the inductance of the coil ?
16mH
10mH
12mH
20mH
Explanation:
Q.
Gravitation force of moon is_________?
7.2 m/s
1.62 m/s
3.75 m/s
9.8 m/s
Explanation:
Q.
hen a body moves in a circle, the angle between its linear velocity and angular velocity is always_______________?
90
0
45
Explanation:
Q.
When a wheel 1 m in diameter makes 30 rev min the linear speed of the point on its rim in ms-1 is_______________?
2?
?
20?
?/2
Explanation:
Q.
An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if_________________?
B = eE/V
E = BeV
E = BeV/2
E = BV
Explanation:
Q.
If a material object moves with speed of light its mass becomes ________________?
zero
double of its rest mass
equal to its rest mass
infinite
Explanation:
Q.
Which of the following is true ?
the spectral series formula can be derived from the Rutherford model of the hydrogen atom.
Paschen series is a line spectrum in the infra red.
Lyman series is a continuous spectrum.
Balmer series is a line spectrum in the ultraviolet.
Explanation:
Q.
An alternating current of the r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing a 10? resistor. The peak current is then ?
5.66A
20.66A
20A
6.66A
Explanation:
Q.
Identify the correct statement about minority carriers_____________?
holes in n-type and free electrons in p-type
holes in n-type and p-type
free electrons in n-type and holes in p-type
free electrons in n-type and p-type
Explanation:
Q.
The rectangular voltage is an example of____________________?
An analogue waveform
Electronic waveform
A digital waveform
Continuous wave form
Explanation:
Q.
Sum of the masses of constituent nucleons as compared to the mass of the resultant nucleus is______________?
Sometimes smaller some times greater
Greater than 82
Smaller
Same
Explanation:
Q.
A central force is that which__________________?
Can produce torque
Some time can produce torque some time cannot
Cannot produce torque
Has no relation with torque
Explanation:
Q.
Torque is defined as______________?
Cross product of position vector and force
Product of force and moment arm
All A, B and C are correct
Turning effect of force
Explanation:
Q.
Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is__________________?
0.1 A
1 m A
1:00 AM
current sensitivity
Explanation:
Q.
Choose the correct statement. In the case of AC circuit ohms law holds for_______________?
All of the above
Instantaneous values of voltage and current
Effective values of voltage and current
Peak values of voltage and current
Explanation:
Q.
If a convex lens of large aperture fails to converge the light rays incident on it to a single point, it is said to suffer from______________?
spherical aberration
chromatic aberration
distortion
both spherical and chromatic
Explanation:
Q.
If a photon is reflected from the mirror then the change in momentum of each photon is_______________?
Half
Double
Zero
1
Explanation:
Q.
Speed of a body can not be_______?
None
Positive
Zero
Negative
Explanation:
Q.
Boyles law helds for ideal gases in________________?
isobaric processes
adiabatic processes
isothermal processes
isochoric processes
Explanation:
Q.
The electronic circuits which implement the various logic operations are called_____________?
Logic functions
Logic gates
Amplifier gain
Boolean algebra
Explanation:
Q.
Blood vessels are______________?
Rigid
Of glass
Of rubber
Not rigid
Explanation:
Q.
To obtain an n-type semiconductor germanium crystal it must be doped with foreign atoms whose valency is_____________?
3
2
4
5
Explanation:
Q.
The dimension of force is__________________?
MLT-2
MLT-1
ML-1T-2
ML-1T
Explanation:
Q.
At constant temperature the graph between V and 1/P is_____________?
Parabola
Hyperbola
A curve of any shape
A straight lime
Explanation:
Q.
The semiconductor diode can be used as a rectifier because _______________?
It has low resistance to the current flow when forward biased & high resistance when reverse biased.
It has high resistance to the current flow when reverse biased
It has low resistance to the current flow when forward biased.
Its conductivity increases with rise of temperature.
Explanation:
Q.
Value of
ge/6
2ge
Zero
6ge
Explanation:
Q.
The equation ? = 1.22 ?/D was devised by_______________?
Planks
Einstein
Raleigh
Newton
Explanation:
Q.
Which one of the following is not a radioactive element ?
Radium
Cadmium
Thorium
Uranium
Explanation:
Q.
Semi-conductors with donor atoms and free electrons belong to the type________________?
any of above
mix
p
n
Explanation:
Q.
Which one of following band is completely filled in case of conductors ?
Conduction band
Forbidden band
Fermi band
Valence band
Explanation:
Q.
The value of R ( Universal Gas Constant ) = ___________?
10.314 J/mole K
8.314 J/mole K
6.5
1.314 J/mole K
Explanation:
Q.
Intensity level of threshold of pain is: _____________?
60 db
100 db
80 db
120 db
Explanation:
Q.
When a body is moving along a circular path it covers a certain angle in a given interval of time. Such type of motion is__________________?
Rotatory motion
Linear motion
Angular motion
Vibratory motion
Explanation:
Q.
A chimney works best if air exposed to the chimney is______________?
Moving slowly
Moving
Moving fast
Stationary
Explanation:
Q.
Terminal velocity is given by equation_______________?
Vt = 9gr2/2?
Vt = gr2/9?
Vt = 2gr2/9?
Vt = gr2?
Explanation:
Q.
Neutron and proton are commonly known as______________?
Meson
Boson
Nucleon
Quartz
Explanation:
Q.
Tesla is the unit for measuring:
Magnetic induction
None of the above
Magnetic moment
Magnetic intensity
Explanation:
Q.
Which one of the following of glass can cut ultraviolet rays?
Pyrex Glass
Soda Glass
Jena Glass
Crookes Glass
Explanation:
Q.
Petrol engine is a________________?
SI engine
all the above
IC engine
C.I engine
Explanation:
Q.
The minimum distance between an object and its real image in a convex lens is_____________?
3f
2.5 f
4f
2 f
Explanation:
Q.
Which of the following waves have smallest velocity in vacuum?
Micro
Sound
Infra-Red
Ultraviolet
Explanation:
Q.
The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is________________?
30
120
90
60
Explanation:
Q.
The total energy of a body executing S.H.M is directly proportional to________________?
Square of an amplitude
The amplitude
Reciprocal of amplitude
The square root of amplitude
Explanation:
Q.
Addition of vector obeys_____________?
Commutative law
Associative law
Distributive law
All given laws in A, B and C
Explanation:
Q.
In forward bias the width of potential barrier_____________?
Decreases
No effect
Remains same
Increases
Explanation:
Q.
For what value of
Both A & B
2
4
-2
Explanation:
Q.
Mohus scale is used for to measure ____________?
Pressure
Hardness
Temperature
Humidity
Explanation:
Q.
The instrument used to measure blood pressure is called____________?
Sphygmomanometer
Venturimeter
Sonometer
Blood pressure
Explanation:
Q.
In hydrogen spectrum which one of the following series lies in the ultraviolet region ?
Pfund series
Bracket series
Lymann series
Balmer series
Explanation:
Q.
Geostationary satellite completes one rotation around the earth in_______________?
6 hours
3 hours
12 hours
24 hours
Explanation:
Q.
What is wavelength of visible spectrum?
7800
8500
3900
1300
Explanation:
Q.
A photon is________________?
A quantum of electromagnetic radiation
A unit of wavelength
A positively charged particle
A unit of energy
Explanation:
Q.
The reverse of LED is______?
Resistor
Capacitor
Photodiode
Diode
Explanation:
Q.
Who were the pioneers of Physics?
Persians
Egyptians
Latin
Greek
Explanation:
Q.
Image of an object 5 mm high is only 1 cm high. Magnification produced by lens is__________________?
0.2
0.5
1
2
Explanation:
Q.
How many days would be in a year if the distance between the earth and the sun were reduced to half of its present value (assuming circular orbit) ?
129 days
730 days
329 days
365 days
Explanation:
Q.
Which of the following is not a correct representation method for prefixes______________?
10km
1mm
1000um
Both A and B
Explanation:
Q.
A person wears spectates with concave lenses. It means that normally (when not using glasses), the image of distant objects is focused in his eyes:
on the retina
in front of the retina
on the blind spot
behind the retina
Explanation:
Q.
It is easier to turn a steering wheel with both hands than with a single hand because______________?
Accelerating force increases on the wheel
Two forces act on the wheel
Two hands provide a firm grip
The couple acts on the wheel
Explanation:
Q.
Electric current in a solid metal conductor is caused by the movement of what ?
Metal ions
Metal atoms
Protons
Electrons
Explanation:
Q.
The simplest type of rectification known as half wave rectification is obtained by____________________?
suppressing the harmonics in A.C voltage
using a transistor
suppressing half wave of A.C supply by using diode
using a Coolidge tube
Explanation:
Q.
Two identical coaxial circular loops carry equal currents in the same direction. If the loops approach each other the current in______________?
One increases whereas that in the other decreases
Each increase
Each decrease
Each remains the same
Explanation:
Q.
Einstein
1/2 mvmax2=hf+?
All of above are correct
1/2 mvmax2=hf-?
1/2 mvmax2-hf = ?
Explanation:
Q.
The number 76.85 is rounded off up to two significant figures as_____________?
76.9
None of these
76.8
77
Explanation:
Q.
Numerical value of Boltzmanns constant is______________?
3.18
3.18
1.38
1.38
Explanation:
Q.
The back emf of a motor which is just started is_________?
Maximum
Zero
Minimum
Optimum
Explanation:
Q.
Which one is a unit vector ?
??3 / 3 i^ + ??3 / 3 j^ + ??3 / 3 k^
??3 i^ + ??3 j^ + ??3 k^
1/??3 i^ + 1/??3 j^ +1/ ??3 k^
Both B and C are correct
Explanation:
Q.
A 10? electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?
110V
220 ?2V
220V
220/ 2V
Explanation:
Q.
Strontium-90 is used as __________________?
?-particle source
?-particle source
Neutron source
?-rays source
Explanation:
Q.
In any measurement the significant figures are______________?
Only doubtful digits
Only accurately known digits
All accurately known digits and the first doubtful digit
All accurately known and all doubtful digits
Explanation:
Q.
Gravitation force of earth is___________?
9.80 m/s
1.62 m/s
7.21 m/s
None of these
Explanation:
Q.
Semi-conductor germanium and silicon are_________________?
tetravalent
pentavalent
divalent
trivalent
Explanation:
Q.
A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion, taking g=10 ?
20 m
15 m
25 m
5 m
Explanation:
Q.
Which one is the dimensionally correct equation ?
V=f/t
f=vt
V=St
S=Vit+1/2at2
Explanation:
Q.
An OP-AMPs can amplify_______________?
D.C.
A.C.
Both A.C. & D.C.
None of the above
Explanation:
Q.
Radiation with wavelength longer than red lights______________?
infra red radiation
ultraviolet rays
visible radiation
X-rays
Explanation:
Q.
Which one of the following is not vector quantity _______?
Acceleration
Speed
Displacement
Force
Explanation:
Q.
A bird sitting on a high tension electric wire does not get electrocuted because:
it does not form a closed path for the flow of current
its feet are good insulators
Sit has high resistance
the body is earthed
Explanation:
Q.
The energy liberated when one atom of U-235 undergoes fission reaction is________________?
20MeV
200MeV
30MeV
40MeV
Explanation:
Q.
The error in measurement may occur due to_________________?
Due to all reasons in A, B and C
The faulty apprentice
The inexperience of a person
Inappropriate method
Explanation:
Q.
The breaking of crystals along definite direction is called _____________________?
Homogeneity
Isotropy
Symmetry
Cleavage
Explanation:
Q.
If a current carrying solenoid is suspended freely it will__________________?
come to rest in N-S direction
be rotating
vibrating like galvanometer needle
comes to rest after rotation
Explanation:
Q.
T.V sets and microwave ovens emit ___________________?
X-rays
?-rays
?-rays
?-rays
Explanation:
Q.
The bulk properties of materials such as their mode of fracture can be related to their____________________?
Cleavage
Microstructure
Polymerization
Dislocation
Explanation:
Q.
The direction of the linear velocity of a body moving in a circle is______________?
along the tangent
directed away from the centre
along the axis of rotation
directed towards the centre
Explanation:
Q.
A Circle has a number of tangents equal to _________?
2
1
Infinite
Explanation:
Q.
Pair production takes place in the vicinity of a heavy nucleus so that_____________?
Net momentum is conserved
Net charge is conserved
All of the above
Net energy is conserved
Explanation:
Q.
A man of weight W is standing on an elevator which is ascending with an acceleration a. The apparent weight of the man is_______________?
mg + ma
mg
mg
mg
Explanation:
Q.
In addition to the daughter nucleus and an electron or positron, the products of a beta decay
Proton
Neutrons
Alpha particle
Neutrino
Explanation:
Q.
If the axis of rotation passes through the body and the body moves around itself then the motion is called:
Orbital motion
Translatory motion
Spin motion
Rectilinear motion
Explanation:
Q.
The alternating voltage is an example of_______________?
An analogue waveform
A digital waveform
None at all
Discrete waveform
Explanation:
Q.
The operational amplifier is______________?
A high gain amplifier
A high resistance amplifier
A high-power amplifier
A low resistance amplifier
Explanation:
Q.
A train is moving with a speed of 100mph. What will be its speed in m/s.?
100 m/s
120 m/s
90 m/s
45 m/s
Explanation:
Q.
Which one of the following radiation possesses maximum penetrating power ?
X-rays
All have the equal penetrating powe
?-rays
B-rays
Explanation:
Q.
Adiabatic process is also called______________?
Heat exchange process
Isentropic process
All of the above
Heating process
Explanation:
Q.
The value of ? for diatomic gas is_______________?
1.67
None
? = 1.3
1.4
Explanation:
Q.
The bombardment of nitrogen with alpha particles will produce______________?
Electron
Positron
Neutron
Proton
Explanation:
Q.
The value of acceleration due to gravity is minimum on which of these planets?
Jupiter
Neptune
Mercury
Mars
Explanation:
Q.
A device for producing high-velocity nuclei is ________________?
Wilson cloud chamber
Cloud chamber
A mass spectrograph
Linear accelerator
Explanation:
Q.
The rectangular coordinate system is also called______________?
Polar coordinate system
Cartesian coordinate system
Spherical coordinate system
Cylindrical coordinate system
Explanation:
Q.
Which one of the following is not a donor impurity ?
antimony
aluminium
phosphorus
arsenic
Explanation:
Q.
Relation between linear velocity and angular velocity:
r=vw
v=rw
?s/?t
s=r
Explanation:
Q.
When a particle of charge q and mass m enters into a uniform magnetic field B moving with a velocity v perpendicular to the direction for the field it describes a circular path of radius___________________?
R=qB/mV
R=qmB/V
R=mV/qB
R=qmV/B
Explanation:
Q.
Rutherford in his atomic model could not explain behavior of ___________ ?
Neutrons
Electrons
Protons
Neutrino
Explanation:
Q.
In bringing an electron towards the second electron, the electrostatic potential energy of the system
becomes zero
increases
remains the same
Decreases
Explanation:
Q.
Ideal fluid is_______________?
Incompressible
Possess all properties
Non-viscous
Steady flow
Explanation:
Q.
Which one of the following radiations possesses maximum velocity ?
?-rays
?-rays
?-rays
All of above have the same speed
Explanation:
Q.
0.001 kg mass will be equivalent to_________________?
250 GWh
0.26 GWh
2.50 GWh
25.00 GWh
Explanation:
Q.
Rest mass of a photon is________________?
infinite
zero
1.67 x 10-27 kg
very small
Explanation:
Q.
The mass-energy relation is the outcome of____________?
General theory of relativity
None of these
Special theory of relativity
Quantum theory
Explanation:
Q.
In Davisson-Germer experiment the diffracted proton from crystal shows______________?
Quantum property
Light property
Wave property
Particle property
Explanation:
Q.
Gravitation force of sun is__________?
362 m/s
None
300 m/s
274 m/s
Explanation:
Q.
Radioactive materials can be identified by measuring their_______________?
Half life
Hardness
Density
Mass
Explanation:
Q.
How many electrons per second constitute a current of one micro ampere?
6.25
one electron
10 electrons
10 electrons
Explanation:
Q.
The unit of radioactivity curie is equal to________________?
3.74 x 109 disintegration per sec
3.70 x 1010 disintegration per sec
3.55 x 1010 disintegration per sec
3.60 x 1010 disintegration per sec
Explanation:
Q.
In a half-wave rectifier the r.m.s. value of the A.C. component of the wave is________________?
Less than D.C. value
More than D.C. value
Zero
Equal to D.C. value
Explanation:
Q.
Torque acting on a body determines_______________?
Angular acceleration
Linear acceleration
Direction of motion of the body
Acceleration
Explanation:
Q.
The Fahrenheit and centigrade scales agree to________________?
15.5
40
273
542
Explanation:
Q.
The process in which no heat enters or leave the system known as _____________?
Isobaric
Isochoric
adiabatic
Isothermal
Explanation:
Q.
At what temperature is the Fahrenheit scale reading equal to twice that of the Celsius scale?
160
280
360
460
Explanation:
Q.
Newton
temperature remaining constant, volume of a given mass of a gas varies inversely
volume of a given mass of gas increases or decreases
attraction or repulsion between two charges
every action there is an equal and opposite reaction
Explanation:
Q.
The linear momentum of an X-ray photon of wavelength 0.1A is_______________?
66.25x1023N-s
data is insufficient
662.5x1023N-s
6.625x1023N-s
Explanation:
Q.
A body in equilibrium__________________?
May be at rest or in uniform motion
Always in uniform motion
Always at rest
May be at rest or in motion
Explanation:
Q.
Zero error of the instrument is a type of_________________?
Classified error
Random error
Systematic error
Personal error
Explanation:
Q.
In multiplication and division of measurement______________?
Absolute uncertainties are added
Percentage uncertainties are added
Absolute uncertainties are divided
Percentage uncertainties are divided
Explanation:
Q.
Total uncertainty, in the result obtained from the subtraction of two measurements, is equal to_______________?
Division of their absolute uncertainties
The product of their absolute uncertainties
Sum of their absolute uncertainties
The difference of their absolute uncertainties
Explanation:
Q.
The velocity of an oscillating charge as it moves to and fro along a wire is always_____________?
zero
constant
infinite
changing
Explanation:
Q.
In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is_______________?
he/ev
he/Vc
impossible to predict
eV/h
Explanation:
Q.
X-ray are________________?
radio isotopes
high energy electrons
of unknown nature
high energy photons
Explanation:
Q.
To measure the speed of an approaching car a police officer shines?
light waves on it
radio waves on it
ultra high frequency waves on it
microwaves on it
Explanation:
Q.
Which one is the correct representation of the unit of pressure ?
Newton/meter2
newton/Meter2
newton/meter2
Newton/Meter2
Explanation:
Q.
S.I unit of frequency is_________________?
ms-1
Radian
Vibration S-2
Hertz
Explanation:
Q.
UV radiation can be produced by______________?
Electron excitation in the gas
All the above
Heating the filament
Ionization of atoms
Explanation:
Q.
Magnetic flux and flux density are related by___________________?
flux density = magnetic flux x area
flux density = magnetic flux area
magnetic flux = flux density x area
magnetic flux = flux density / area
Explanation:
Q.
Sterilization of surgical instruments medical supplies and bandages can be done by exposing them to a beam of_______________?
?-rays
?-rays
?-rays
B and C have equal antiseptic propertie
Explanation:
Q.
For which position maximum blood pressure in the body have the smallest value ?
Laying horizontally
Sitting on ground
Standing straight
Sitting on chair
Explanation:
Q.
An example of scalar quantity is _________?
Displacement
Acceleration
Velocity
Speed
Explanation:
Q.
The average acceleration caused by gravity per second is____________?
52 feet
32 feet
42 feet
22 feet
Explanation:
Q.
An elevator weighing 3.5 x 10-6 N is raised to a height of 1000 m in the absence of friction, the work done is_________________?
3.5 x 104 J
3.5 x 10-3 J
3.5 x 106 J
3.5 x 109 J
Explanation:
Q.
In simple cube one atom or molecule lies at its______________________?
Nine corners
Eight corners
Six corners
Force corners
Explanation:
Q.
If the velocity-time graph gives a parabolic curve then body posses______?
Zero acceleration
Constant acceleration
All of these
Variable acceleration
Explanation:
Q.
The phase of SHM describes________________?
The direction of motion only
Displacement only
Neither displacement nor direction of motion
Both displacement and direction of motion
Explanation:
Q.
Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always___________________?
BINA
BINA sina
BINA cosa
BINA tana
Explanation:
Q.
The path of alpha particle is_______________?
Curved
Elliptical
Zig-zag or erratic
Rectilinear
Explanation:
Q.
The net charge on n-type material is____________________?
Both positive and negative
Positive
Neutral
Negative
Explanation:
Q.
In the transistor schematic symbol, the arrow_______________?
is located on the emitter
points form north to south
is located on the base
is locate on the collector
Explanation:
Q.
By how many times are the Electrostatic forces stronger than the Gravitational Forces for a fixed distance?
10
10
10
None of these
Explanation:
Q.
Which of the following branch of Physics deals with the internal structure of earth?
Plasma physics
Atomic physics
Geophysics
Biophysics
Explanation:
Q.
A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________?
(F1+F2) (12-11)
(F1+F2) (122-112)
(F1+F2) (12-11)
(F1+F2) (121+122)
Explanation:
Q.
What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ?
0.5 mH
0.5H
8.0H
2.0H
Explanation:
Q.
Newton
Work
Energy
Momentum
Inertia
Explanation:
Q.
In which quadrant the two rectangular components of a vector have same sign ?
2nd
4th
Both 1st and 3rd
1st
Explanation:
Q.
Two vectors are A = 3i^+2j^ -k^& B = 3i^-2j^ +k^ , then_____________?
B has a negative magnitude
B is a negative vector of A
B is anti-parallel to A
B is perpendicular to A
Explanation:
Q.
The dimensions of the coefficient of viscosity are_____________?
M2L-1T-1
M2L1T1
ML-1T-1
ML1T-1
Explanation:
Q.
A piece of copper and a piece of germanium are cooled from the room temperature down to 77 K.
The resistance of copper decreases and that of germanium increases.
The resistance of each of them increases.
The resistance of each of them decreases.
The resistance of copper increases and that of germanium decreases
Explanation:
Q.
If the plane of the rectangular coil is parallel to the magnetic field (i.e radial magnetic field) the torque on the coil is_____________________?
? = NIAB
? = NIAB cos?
? = NIAB sin?
? = NIAB tan?
Explanation:
Q.
If east, west, north, south, up and down are representing the direction of unit vectors, then east x south has the direction along_____________?
West
North
Down
Up
Explanation:
Q.
The value of resistivity for insulator is of the order of____________?
107 ohm metre
108 ohm metre
106 ohm metre
105 ohm metre
Explanation:
Q.
One light year is equal to________________?
9.5x1015m
9.5x1015Km
9.5x1015cm
9.5x1015sec
Explanation:
Q.
Electrons_________________?
Can exist both inside and outside the nucleus
Cannot exist inside the nucleus
Can exist inside the nucleus
Do not know
Explanation:
Q.
The cross product of two vectors is a negative vector when______________?
They are parallel vectors
They are a perpendicular vector
They are rotated through 270
They are anti parallel vectors
Explanation:
Q.
Ground state energy of the 4th orbit in a H-atom is_____________?
3.40 eV
0.85 eV
1.51 eV
13.60 eV
Explanation:
Q.
Power of a lens is one diopter if its focal length is
2 meter
1 meter
Explanation:
Q.
Irregular flow of fluid is called_______________?
Turbulent
Streamline
Laminar
Uniform
Explanation:
Q.
The characteristic X-rays spectrum is due to_____________?
The bombardment of target by electrons
The illumination of the target metal by ultra-violet radiation
The absorption of radiation by the target metal
The bombardment of the target by protons
Explanation:
Q.
Steradian is the SI unit of________________?
Solid angle
Plane angle
Neither plane angle nor solid angle
Both plane angle and solid angle
Explanation:
Q.
The first overtone of a stretched string of given length is 320 Hz. The first harmonic is_________?
320 Hz
160 Hz
480 Hz
640 Hz
Explanation:
Q.
1 Weber / m
One gauss
1/3
10? gauss
3
Explanation:
Q.
For the successful operation of Heat engine which condition should be met ?
both A and B
operated at certain temperature difference
cyclic process
none of these
Explanation:
Q.
Boltzman constant K in terms of universal gas constant R and Avagadros number Na is give as_______________?
K = R/Na
K = Na/Ra
K = nRNa
K = RNa
Explanation:
Q.
For a simple pendulu,m the restoring force is caused by________________?
Gravity
Hand
All of these
Spring
Explanation:
Q.
To reduce the uncertainty in the timing experiment______________?
Count number of vibration
Both a and C
Conduct at room temperature
Highly precise instrument
Explanation:
Q.
The specially designed semi-conductor diodes used as fast counters in electronic circuits are______________?
Photo voltaic cell
Photo diodes
The light emitting diodes
Solar cells.
Explanation:
Q.
Geiger counter is suitable for _________________?
Extremely fast counting
Fast counting
Slow counting
All situations
Explanation:
Q.
n instrument which can measure potential without drawing any current is_____________________?
galvanometer
ammeter
cathode ray oscilloscope (CRO)
Explanation:
Q.
As the temperature of black body is raised the wavelength corresponding to maximum intensity________________?
shifts towards longer wavelength
shifts towards longer as well as shorter wavelengths
remain the same
shifts towards shorter wavelength
Explanation:
Q.
The effective way to increase the sensitivity of a moving coil galvanometer is to___________________?
use a coil with very large number of turns
use a very strong magnetic field
use a coil of very large area
use a very long and fine suspension
Explanation:
Q.
Which of the following is not derived quantity________?
Time
Volume
Density
Area
Explanation:
Q.
SI unit of torque is______________?
joule
Both a and b are correct
Neither a nor b is correct
N.m
Explanation:
Q.
The Capacity of doing work is called_________?
Energy
Momentum
Power
Work
Explanation:
Q.
For a gas obeying Boyles law if the pressure is doubled the volume becomes________________?
one fourth
four times
one half
double
Explanation:
Q.
Two parallel beams of positrons moving in the same direction will________?
be deflected normal to the plane containing the two beams.
repel each other
not interact with each other
attract each other
Explanation:
Q.
The electrons in conduction band are free to___________________?
Transport charge
Transport impulses
Transport signals
Transport vibrations
Explanation:
Q.
The work done in the isochoric process is________________?
variable
depends on situation
zero
constant
Explanation:
Q.
Pair production can take place only with_________________?
Gamma rays
IR-rays
X-rays
UV-rays
Explanation:
Q.
The angular speed for daily rotation of the earth in rad S-1 is______________?
7.3 x 10-5 radians/second
7.3 x 5 radians/second
7.3 x 10 radians/second
3.7 x 10 7.3 x 5 radians/second
Explanation:
Q.
The mass of an object will get doubled at the speed of __________?
2.6
2.6
2.6
2.6
Explanation:
Q.
According to equation of continuity A1V1 = A2V2 = constant. The constant is equal to_______________?
Mass of fluid
Flow rate
Volume of fluid
The density of the fluid
Explanation:
Q.
The area enclosed by the curve ABCDA for a Carnot heat engine represents the work done by Carnot engine_______________?
during its operation
at any instant
during one cycle
averagely
Explanation:
Q.
In the electron microscope, electric & magnetic fields are used as_______________?
Deflecting charged particle
Converging source of electrons
Source of electromagnetic waves
Electromagnetic gun
Explanation:
Q.
Which of the following is not a unit of length?
light year
angstrom
radian
micron
Explanation:
Q.
Which one is not a type of dynamic equilibrium ?
Both A and C are corret answer
Translational equilibrium
Rotational equilibrium
Static equilibrium
Explanation:
Q.
Why the needle of iron swims on water surface when it is kept gently ?
due to its shape
It will remain under the water, when it will displace more water than its weight
the density of needle is less than that of water
due to surface tension
Explanation:
Q.
Radiations are used for the treatment of skin of a patient is_______________?
Beta rays
X-rays
Alpha rays
Gamma rays
Explanation:
Q.
Systolic pressure is called_______________?
Abnormal blood pressure
Low blood pressure
Normal blood pressure
High blood pressure
Explanation:
Q.
If the distance-time graph gives a straight line then body possesses___________?
Variable Velocity
Uniform Velocity
Zero Velocity
None
Explanation:
Q.
The diameter of an atom is approximately_______________?
10-11m
10-12m
10-14m
10-10m
Explanation:
Q.
CGS unit of Force is_________?
Joule
Erg
Newton
Dyne
Explanation:
Q.
Hydrogen atom does not emit X-rays because _________________?
it is too small in size
its energy levels are too close to each other
it has a single electron
its energy levels are too far apart
Explanation:
Q.
A photostat machine works on _____________?
electrostatic image making
electromagnetic image making
magnetic image making
thermal image making
Explanation:
Q.
Two convex lenses of equal focal length f are placed in contact the resultant focal length of the combination is______________?
zero
focus
f/2
2 f
Explanation:
Q.
A wheat stone bridge is said to be balanced when____________________?
minimum current flows through the galvanometer branch
potential difference across galvanometer branch is maximum
maximum current flows through the galvanometer branch
potential difference across galvanometer branch is zero
Explanation:
Q.
Length, mass, time, intensity of light and amount of substance are examples of ____________?
Quartile quantities
Base quantities
Prefixes
Derived quantities
Explanation:
Q.
The name of the photon for quantum of light was proposed by________________?
Plank
Einstein
Ampere
Thomson
Explanation:
Q.
Mass of neutron is________________?
1.67 x 10-31 kg
1.67 x 10-27 kg
9.1 x 10-31 kg
1.67 x 10-19 kg
Explanation:
Q.
The charge on beta particle is________________?
+2
1
-1
-2
Explanation:
Q.
Mach is the unit of measurement in stating the speed of a moving object in relation to__________?
The speed of air resistance
The speed of other object
The speed of sound
The speed of light
Explanation:
Q.
Which one of the following has the greatest energy gap ?
any of above
semi conductor
conductor
insulator
Explanation:
Q.
Waves emitted from the antenna are__________________?
Sound waves
Modulated waves
Radio waves
Electromagnetic waves
Explanation:
Q.
Rainbow is seen after rain because of hanging molecules of water which act as __________?
Prism
Slabs
Lens
Mirror
Explanation:
Q.
Average energy required to remove one nucleon from the nucleus is called__________________?
All of above
Energy of decay
Destruction energy
Binding energy per nucleon
Explanation:
Q.
Optics does not deal with ___________?
Characteristics of sound
Nature of light waves
Properties of light
Lenses and mirrors
Explanation:
Q.
The relation between linear and angular acceleration is______________?
r = a x a
a = a x r
a = a x r
a = r x a
Explanation:
Q.
A cube of side 5 cm has a charge of 6 C. The surface density of charge is_________?
200 C m
400 C m
300 C m
100 C m
Explanation:
Q.
Joule Thomson effect is based upon __________ ?
Sudden expansion of gases
Cooling of gases
Sudden compression of gases
Heating of gases
Explanation:
Q.
An ideal standard of measurement of a base quantity has characteristics_______________?
Invariable
Only a and b are correct
Accessible
Transportable
Explanation:
Q.
The diameter of a lens is called________________?
radius of curvature
principal axis
focal length
aperture
Explanation:
Q.
During fusion of hydrogen into helium________________?
Energy is released
Mass is reduced due to the energy released
Energy is absorbed
Mass is increased due to energy absorption
Explanation:
Q.
In an electronic transition atom cannot emit______________?
Infra red radiation
Visible light
?-rays
Ultraviolet rays
Explanation:
Q.
The product of the frequency and time period is equal to_________________?
4
2
1
3
Explanation:
Q.
The unit of force in CGS, system is __________?
Dyne
None of these
Newton
Pound
Explanation:
Q.
The internal energy of the system increases__________?
in adiabatic expansion
in adiabatic compression
in isothermal expansion
in isothermal compression
Explanation:
Q.
The natural frequency of simple pendulum depends upon_______________?
The square root of its length
Square of its length
It
It
Explanation:
Q.
p-n junction when reversed biased acts as a_______________?
inductor
capacitor
off switch
on switch
Explanation:
Q.
The least distance of distinct vision for a normal eye is_______________?
25 cm
30 cm
40 cm
15 cm
Explanation:
Q.
Mass-Energy relation given by Einstein in represented as: ____________?
E=m
E=mc
E=mv
E=hf
Explanation:
Q.
What is the SI unit of acceleration is ___________?
Both
Meter per secound
meter per second square
All
Explanation:
Q.
A digit zero in a measurement__________________?
May be significant may not significant
Significant only if left to a significant figure
Always significant
Always insignificant sign
Explanation:
Q.
Electromagnetic waves emitted from antenna are________________?
Stationary
All the above
Longitudinal
Transverse
Explanation:
Q.
The number of significant figures in the length of a bar 6200mm measured by meter rod is_______________?
3
2
4
None of these
Explanation:
Q.
If Ax is -ve and Ay is +ve, the resultant is:___________?
1st
4th
3rd
2nd
Explanation:
Q.
The normal blood pressure range for a human body is______________?
100 to 80 torr
60 to 140 torr
120 to 60 torr
120 to 80 torr
Explanation:
Q.
Stopping potential for a metal surface in case of photoelectric emission depends on_____________?
the threshold frequency for the metal surface
all of the above
the frequency of incident light and work function of the metal surface
the intensity of incident light
Explanation:
Q.
In case of a simple pendulum, the cause of damping is__________________?
Gravity
None of these
Tension in the string
Drag force of air
Explanation:
Q.
What is the SI unit of modulus of elasticity of substance ?
Nm-2
Nm-1
Jm-2
Being a number it has no unit.
Explanation:
Q.
Field particle of Electromagnetic interaction is _________?
Meson
Graviton
Vector Boson
Photon
Explanation:
Q.
The SI unit of Heat is________?
Joule
Watt
Volt
Newton
Explanation:
Q.
The effect of the decrease in pressure with the increase of the speed of the fluid in a horizontal pipe is known as______________?
Torricelli effect
Stokes effect
Bernoulli effect
Venturi effect
Explanation:
Q.
A choke is used as a resistance in_________________?
AC circuits
DC circuit
Both AC and DC circuit
Full wave rectifier circuit
Explanation:
Q.
X-rays are similar in nature to_______________?
Beta rays
Positive rays
?-rays
Cathode rays
Explanation:
Q.
A cup of milk is placed in a microwave oven. Tell which statements is false. (1) Milk will be heated up only. (2) Cup will remain cool. (3) Both cup and mild will get hot ?
1
None
2
3
Explanation:
Q.
Unit vector n^ is along______________?
Normal on a surface
X-axis
Z-axis
Y-axis
Explanation:
Q.
X-rays are diffracted by a crystal but not by a diffraction grating because_____________?
The penetration power of X-rays is high in a diffraction grating
The ions in a crystal are well arranged
The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal
The lines in a diffraction grating cannot reflect X-rays.
Explanation:
Q.
If A=Ax i^ + Ay j^ + Az K^ B = Bx i^ + By j^ + Bz K^ then______________?
A. B = Ay Bz + Az By + Az Bx
A. B = Ax By + Ay Bz + Az By
A. B = Ax Bx + Ay By + Az Bz
A. B = Ax Bz + Ay By + Az Bx
Explanation:
Q.
For chain reaction to build up the size of the radioactive target should be______________?
Equal to the critical size
All of above can build up a change reaction
Greater than the critical size
Less than the critical size
Explanation:
Q.
A million electron are added to a pith ball. Its charge is________?
Explanation:
Q.
Earth
45 km/s
70 km/s
60 km/s
30 km/s
Explanation:
Q.
The frequency of the second pendulum is________________?
1 hertz
1.5 hertz
0.5 hertz
2.5 hertz
Explanation:
Q.
Due to the relative motion of observer and frame of reference time:
Dilates
Contracts
Constant
Uniform
Explanation:
Q.
Ina liquid metal fast breeder reactor, the type of uranium used is______________?
92U239
92U235
92U234
92U238
Explanation:
Q.
If a diffraction grating is placed in the path of a light beam it reveals______________?
Electromagnetic wave property
Particle property
Wave property
Energy particle
Explanation:
Q.
The minimum wavelength of X-rays produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be______________?
4 x 10-10m
9.1 x 10-18m
6.2 x 10-10m
3.11 x 10-10m
Explanation:
Q.
When K.E energy of SHM is maximum its__________________?
Acceleration is zero
All P.E acceleration and restoring force are zero
P.E is zero
Restoring force is zero
Explanation:
Q.
The standard vector symbol for flux density is ____________________?
M
L
B
H
Explanation:
Q.
Thermions are________________?
photons
positrons
protons
electrons
Explanation:
Q.
An A.C series circuit containing 4? resistance and 3? inductive reactance. The impedance of the circuit is______________?
5?
7?
1?
7?
Explanation:
Q.
Compton effect proves the________________?
Wave nature of light
Uncertain nature of light
Dual nature of light
Photon theory of light
Explanation:
Q.
CGS system of units is also called __________?
Metric system
Metric or British system of units
Metric or French system of units
None of these
Explanation:
Q.
One pico stands for_________________?
10 raised to power -15
10 raised to power -6
10 raised to power -12
10 raised to power -9
Explanation:
Q.
To obtain a p-type semi-conductor Si Crystal must be doped with foreign atoms whose valency is_____________?
3
4
2
5
Explanation:
Q.
Which of the following pair of forces can produce a resultant of 8N?
3N & 6N
4N & 1N
2N & 5N
20N & 2N
Explanation:
Q.
Forward current through a semi conductor diode circuit is due to____________?
minority carriers
majority carriers
electron
holes
Explanation:
Q.
pure resistor circuit the voltage and current are_______________?
No phase difference
Lagging each other
They are at 90? phase difference
They have zero phase difference
Explanation:
Q.
Terminal velocity is_____________?
Uniform and maximum
Maximum
Uniform
Neither uniform nor maximum
Explanation:
Q.
Which one of the following possesses greater penetration power ?
?-rays
Neutron-rays
?-rays
?-rays
Explanation:
Q.
Electron moves in the orbit as________________?
Standing wave motion
S.H.M likes the sound
Vibratory motion like up and down
Simple vibratory motion
Explanation:
Q.
The device or circuit used for conversion of A.C. into D.C. is called_______________?
Filtering circuit
Converter.
A rectifier
An amplifier.
Explanation:
Q.
The working of transistor as amplifier is similar to________________?
Step down transformer
Triode vacuum tube
Step up transformer
Three diodes in common
Explanation:
Q.
Acceptor and donor impurities donate______________?
p-carriers only
n-carriers and p-carriers respectively
n-carriers only
p-carriers and n-carriers respectively
Explanation:
Q.
Bernoulli
Both laminar and turbulent flow
None of these
Laminar flow
Turbulent flow
Explanation:
Q.
In S.H.M. the velocity of a particle is maximum at________________?
extreme position
mean position
middle between the mean and extreme position on the left side
middle between the mean and extreme position on the right side
Explanation:
Q.
Radioactive decay obeys which one of the following law ?
N=Noe?t
N=Noe-?t
N=Noe-?t/2
No=N(1+e?t)
Explanation:
Q.
Metabolism is the name of a process in which energy transformation takes place within______________?
Atmosphere
Laboratory
Heat engine
Human body
Explanation:
Q.
The equation of continuity is obtained by applying in the law of conservation of_____________?
Momentum
Mass
All
Energy
Explanation:
Q.
In full wave rectification the output D.C. voltage across the load is obtained for_____________?
All of the above.
The complete cycle of input A.C.
The positive half cycle of input A.C.
The negative half cycle of input A.C.
Explanation:
Q.
Sphygmomanometers measures blood pressure ?
Some time static and sometimes dynamic
Statically
Dynamically
None of these
Explanation:
Q.
A black body has the property to _____________ all the radiation entering it.
Exude
Absorb
Reflect
None of these
Explanation:
Q.
Which of the following radiations are suitable for the treatment of an infection in the interior of the body ?
?-rays
?-rays
?-rays
X-rays
Explanation:
Q.
A capacitor of capacitance 30
0.9x102sec
0.9sec
15 sec
1.5x105sec
Explanation:
Q.
Maximum frequency in the spectrum from X-ray tube is directly proportional to the______________?
The soft target which can easily emit electrons
All of above are correct
The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated
Number of incident electron i.e. filament current
Explanation:
Q.
What is the angle that the given vector makes with y-axis and A=2i+3j ?
30
120
60
90
Explanation:
Q.
The curie temperature is that at which ____________________?
Ferromagnetic becomes paramagnetic
Semi-conductor becomes conductors
Paramagnetic becomes diamagnetic
Metals become super conductor
Explanation:
Q.
Which one is the derived quantity in SI units _____________?
Amount of substance
Electric charge
Electric current
Plane angle
Explanation:
Q.
Nuclear forces exist between ___________________?
Neutron-neutron
Proton-proton
All of the above
Proton-neutron
Explanation:
Q.
Gas molecules of different masses in the same container have the same average transnational kinetic energy which is directly proportional to their_____________?
absolute temperature
volume
time
pressure
Explanation:
Q.
The turning effect of force is called_________?
None of these
Moment
Momentum
Torque
Explanation:
Q.
An electric motor could be used as a: ___________?
Transformer
Capacitor
Battery
Dynamo
Explanation:
Q.
Ceramic magnets are_______?
None of these
Insulators
Conductors
Semiconductors
Explanation:
Q.
Which one of the following material is most suitable for making core of an electromagnet ?
steel
Cu-Ni alloy
air
soft iron
Explanation:
Q.
When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be_______________?
Same
At L will be more than at C
Different
At L will be less than at C
Explanation:
Q.
If electrical conductivity increases with the increase of temperature of a substance, then it is a:
None of the above
Insulator
Conductor
Semiconductor
Explanation:
Q.
In optic fiber transmission system _____________ are used regenerate the dim light signal?
Repeaters
Diodes
Laser
Transformer
Explanation:
Q.
The SI unit of force constant is identical with that of__________________?
Loudness
Surface tension
Force
Pressure
Explanation:
Q.
Michelson devised the formula to calculate the speed of light_______________?
C = 5/2fd
C = 8fd
C = 4fd
C = 16fd
Explanation:
Q.
The force responsible for the vibratory motion of the simple pendulum is_________________?
mg ton?
mg
mg sin?
mg cos?
Explanation:
Q.
An alpha particle in a single encounter__________________?
Loses no energy at all
Loses a small fraction of its energy
Losses most of its energy
Loses all of its energy
Explanation:
Q.
When X-rays are passed through successive aluminum sheets what happens to their thickness ?
it decreases
sometimes increases and sometimes decreases
increases
it remains same
Explanation:
Q.
The charged particle enters the uniform magnetic field in such a way that its initial velocity is not perpendicular to the field the orbit will be__________________?
helix
an ellipse
a spiral
a circle
Explanation:
Q.
Two identical metal balls with charges + 2Q and
F/2
F/4
F
F/8
Explanation:
Q.
According to Einstein, the gravitational interaction is possible between_______________?
none of the above
material objects only
electromagnetic radiations
material objects and electromagnetic radiation only
Explanation:
Q.
If vectors a and b are antiparallel to each other then their resultant is ___________?
2b
a+b
a?b
2a
Explanation:
Q.
An OP-AMP comparator is a circuit that compares the signal voltage on one of its inputs with a ______________?
Output
Virtual input
Non-inverting voltage at output
Reference voltage on the other
Explanation:
Q.
When two charges are placed in water then the Coulomb force between them reduces to _____________?
1/78 times
1/58 times
1/3 times
1/2 times
Explanation:
Q.
What is the outward force acting on a mass of 10 kg when rotating at one end an inelastic string 10m long at speed of 1m/s ?
1N
100N
10N
2N
Explanation:
Q.
The device used for conversion of D.C. to A.C. is called______________?
Converter
A rectifier
Oscillator
Inverter
Explanation:
Q.
The dimension of velocity are __________?
LMT^-1
LMT
LT
LT^-1
Explanation:
Q.
Null vector is a vector which has________________?
No specified direction
Both A and B are correct
Both A and B are not correct
Zero magnitude
Explanation:
Q.
We have two bodies, One is moving with 2m/s velocity and other is at rest, which one has greater inertia?
Moving body
Both have same inertia because inertia depends upon mass only
Body is at rest
Both have not any inertia
Explanation:
Q.
The existence of Ether wind was experimentally rejected by__________________?
infinite
zero
double of its rest mass
equal to its rest mass
Explanation:
Q.
The audio signals of TV are _____________?
Velocity modulated
Frequency modulated
Amplitude modulated
fixe modulated
Explanation:
Q.
Speed of efflux can be determined by applying______________?
Torricelli
Bernoulli
All
Venture relation
Explanation:
Q.
An object travels at constant speed around a circle of radius 1.0 m in 2.0 seconds. What is the magnitude of its acceleration?
?
2
4
Explanation:
Q.
Which of the following will be a better shield against gamma rays ?
Lead
Aluminum
Heavy water
Ordinary water
Explanation:
Q.
An angle between two vectors A and B can be determined by_____________?
Head to tail rule
Their cross product
Right-hand rule
Their dot product
Explanation:
Q.
Unit vector is used to specify the _____________?
Frequency
Direction of vector
Velocity
Magnitude
Explanation:
Q.
Displacement of the body in S.H.M is equal to amplitude when the body is at_______________?
Elsewhere
Mean position
Extreme position
None
Explanation:
Q.
Final image produced by a compound microscope is_____________?
virtual and erect
real and erect
virtual and inverted
real and inverted
Explanation:
Q.
SI unit of the coefficient of viscosity is___________________?
Kg.m.S-1
Kg-1.m-1.S-1
Kg m-1.S-1
Kg.m.S
Explanation:
Q.
A photon of wavelength 900nm behaves like a particle of mass______________?
1.84 x 10-44kg
2.46 x 10-36kg
5.53 x 10-36kg
0 kg.
Explanation:
Q.
In scientific notation, numbers are expressed in________________?
Reciprocal
Powers of two
Power of ten
Decimal
Explanation:
Q.
Who discovered the inverse square law for gravity ?
Galileo
Newtons
Einstein
Plank
Explanation:
Q.
A body will be in complete equilibrium when it is satisfying______________?
1st condition of equilibrium
Impossible
Both Ist and 2nd condition of equilibrium
2nd condition of equilibrium
Explanation:
Q.
The flow of ideal fluid is always_______________?
Turbulent
Irregular
Straight line
Streamline
Explanation:
Q.
An emf of 5 volt is produced by a self inductance, when the current changes at a steady rate from 3 to 2 ampere in 1 millisecond. The value of self inductance is_______?
zero
5 H
5000 H
5 mH
Explanation:
Q.
A vector which has magnitude one is called _________?
A null vector
A unit vector
A resultant vector
A position vector
Explanation:
Q.
At Murree Hills (Assume the value of g changes). If we use a simple pendulum as time standard then one-second duration will_____________?
Remains the same
Decrease
Increase
Is zero
Explanation:
Q.
In the capacitive circuit the current___________________?
Lags behind voltage by ?/2
Leads forward the voltage by ?/2
Opposite in phase of voltage by ?
Is in phase with voltage
Explanation:
Q.
A potential difference is applied across the ends of a wire. If the potential difference is doubled, then the drift velocity of free electron will.
be doubled
remain unchanged
be quadrupled
be halved
Explanation:
Q.
Electromagnetic waves travel in free space with the speed of___________________?
Positive rays
?-rays
More than sound waves
Cathode rays
Explanation:
Q.
A vacant or partially filled band is called _____________________?
Valence band
Conduction band
Forbidden band
Empty band
Explanation:
Q.
If a wire has a resistance of 0.5 ohm, then its conductance is:
2 S
1.5 S
1 S
5 S
Explanation:
Q.
When average and instantaneous velocities become equal then body possess_______?
Variable Acceleration
Variable Velocity
Uniform Velocity
Uniform Acceleration
Explanation:
Q.
In p-n-p transistor the collector current is________________?
any of above
slightly less than emitter current
greater than emitter current
equal to emitter current
Explanation:
Q.
One radian is equal to______________?
67.3
60
87.3
57.3
Explanation:
Q.
Force 100N is applied on a wire produces extension 5mm in it. Energy stored in it is
0.125 J
1 J
0.250 J
0.50 J
Explanation:
Q.
Three students measured the length of a needle with meter rod and recorded as : (i) 0.2145m (ii) 0.21m (iii) 0.214m Which one is a correct record ?
Only (ii)
Both (i) and (ii)
Only (iii)
Only (i)
Explanation:
Q.
Maximum number of components of a vector may be________________?
1
Infinite
3
2
Explanation:
Q.
A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ?
4 volt
0.4 volt
2 volt
5 volt
Explanation:
Q.
The velocity of the mass attached to a spring is maximum at_______________?
Both A and B
Mean position
None
Extreme position
Explanation:
Q.
Velocity of fluid increases where the pressure is________________?
Low
High
Constant
Changes continuously
Explanation:
Q.
The charge on an electron was determine by ________________?
Thomson
Maxwell
Ampere
Millikan
Explanation:
Q.
One torr is equal to_________________?
1.333 Nm-2
.1333 Nm-2
133.3 Nm2
13.33 Nm-2
Explanation:
Q.
A force applied on a body through the string is called_________?
Momentum
Tension
Torque
Weight
Explanation:
Q.
If the length of the second pendulum becomes four times, then its time period will become________________?
8 times
2 times
6 times
4 times
Explanation:
Q.
A stone is whirled in a vertical circle at the end of a string. When the stone is at the highest position the tension in the string is______________?
Maximum
Zero
Less than the weight of the stone
Equal to the weight of the stone
Explanation:
Q.
A transmitting station emits radio waves of wavelength ? at power P. If h is Planck
Speed of lightB.
Speed of sound
?
h
Explanation:
Q.
If capacitance of L-C circuit is made four times then frequency of the circuit becomes___________________?
None
Four times
Twice
One half
Explanation:
Q.
In normal state of energy the incident high energy photons will be______________?
Absorbed
Cause laser production
Cause X-ray emission
Stimulated
Explanation:
Q.
Various types of cancer are treated by_________________?
Carbon-14
Cobalt-60
Strontium-90
Nickel-63
Explanation:
Q.
The most suitable unit for expressing nuclear radius is_______?
Fermi
Micro
Angstrom
Nano meter
Explanation:
Q.
When A.C current passes through a capacitor then the current relationship will be_______________?
The voltage leads current by phase angle is 45 degrees
The current lead voltage by phase angle is 90 degrees
The voltage leads current by phase angle is 90 degrees
The current lead voltage by phase angle is 45 degrees
Explanation:
Q.
Concentration of red cells in blood is about______________?
25%
40%
75%
50%
Explanation:
Q.
Reflecting mirrors in laser is used to______________?
Further stimulation
For producing more energetic lasers
All
Lasing more
Explanation:
Q.
Which of the following are not deflected by electric and magnetic fields ?
None of these
Beta rays
Alpha rays
Gamma rays
Explanation:
Q.
X-rays are electromagnetic waves like________________?
Heat waves
?-rays
Light waves
Microwaves
Explanation:
Q.
Quality of X-rays depends upon ____________ A-filament current B-accelerating voltage C-material of the target ?
A & B
A & C
A B & C
B & C
Explanation:
Q.
The slope of velocity-time graph gives_______?
All of these
Acceleration
Speed
Velocity
Explanation:
Q.
A football is kicked at 45 degrees with horizontal with K.E of E. Its K.E. at highest point is
Zero
E/2
E
E/(2)
Explanation:
Q.
The waves which are used for line of sight (LOS) communication are called:
None of these
Cable waves
Space waves
Antenna waves
Explanation:
Q.
The anti-matter is composed of: __________________?
All of these
Anti-proton
Anti-electrons
Anti-neutron
Explanation:
Q.
The minimum wavelength of X-rays can further be reduced by _______________?
Using a target element of higher atomic number
Increasing the potential difference between the cathode and the target
Reducing the pressure or cooling the target
Increasing the temperature of the filament.
Explanation:
Q.
Which one is true for internal energy ?
It is sum of all forms of energies associated with molecules of a system
It is a state function of a system
It is proportional to transnational K.E of the molecules
All are correct
Explanation:
Q.
Energy needed to magnetize and demagnetize is represented by _________________?
Straight line
Hysteresis loop area
Hysteresis curve
Hysteresis loop
Explanation:
Q.
Least distance of distinct vision_____________?
neither increases nor decreases
becomes infinite after 60 years
decreases with increase in age
increases with increase in age
Explanation:
Q.
Venturi meter is used to measure_________________?
Fluid density
Fluid pressure
Fluid speed
None
Explanation:
Q.
The carburettor of a car is an application of_______________?
Venturi meter
Bernoulli equation
None
Both A and B
Explanation:
Q.
In He-Ne laser the lasing action is produced by_______________?
Electrons of He
He-Ne both
Ne only
Electrons Ne
Explanation:
Q.
Non-inverting amplifier circuits have____________?
A very high input impedance
A low output impedance
A very low input impedance
None of the above
Explanation:
Q.
A.C. and D.C. have the same __________?
Heating effect through a resistance
Affect while passing through an inductance
Affect in charging a capacitor
Affect in charging a battery
Explanation:
Q.
An alpha particle is emitted from 88Ra226. What is the mass and atomic number of the daughter nucleus ?
222
226
220
224
Explanation:
Q.
Young
Liquid only
All of the above
Gas only
Solid only
Explanation:
Q.
For anti-parallel vectors angle is equal to ____________?
270
180
90
None of these
Explanation:
Q.
The vector A= 2i^+2j^ makes_______ angle with x-axis.?
30
60
90
45
Explanation:
Q.
Which of the following pairs does not have identical dimensions ?
Energy and work
Momentum and impulse
Torque and energy
Mass and moment of inertia
Explanation:
Q.
The fission chain reaction in a nuclear reactor can be controlled by introducing _______________?
Platinum rods
Graphite rods
Cadmium rods
Iron rods
Explanation:
Q.
The power of a concave lens is_______________?
negative
virtual
positive
real
Explanation:
Q.
Product of time period and frequency is ____________?
Time period
Unity
Velocity
Frequency
Explanation:
Q.
Mirage is an example of ___________?
Scattering of light
Refraction and total internal reflection of light
refraction of light
reflection of light
Explanation:
Q.
A hoop and disc have same mass and radius. Their rotational K.E are related by an equation______________?
K.E hoop = 2K.E disc
K.E hoop = 1/2K.E disc
K.E hoop = K.E disc
K.E hoop = 4K.E disc
Explanation:
Q.
A uniform steel wire of length 4m and area of cross-section 3
0.100J
0.75J
0.50J
0.025J
Explanation:
Q.
Which quantity is a state function_______________?
internal energy
heat supply
volume
pressure
Explanation:
Q.
As a result of annihilation of electron and positron, number of ?
Two
One
Four
Three
Explanation:
Q.
If a car moves with a uniform speed of 2 ms-1 in a circle of radius 0.4. Its angular speed is______________?
4 rad. S-1
5 rad. S-1
2.8 ms-1
1.6 rad. S-1
Explanation:
Q.
A magnetic compass will be deflected if it is kept near a____________________?
both
charge at rest
charge in motion
none
Explanation:
Q.
When the amplitude of a wave becomes double its energy become_________________?
Four times
None time
One half
Double
Explanation:
Q.
The direction of a vector in space is specified by_______________?
Two angle
Three angle
No angle
One angle
Explanation:
Q.
Coercive force is the force which opposes ____________________?
Breakage
Surface cracking
Extension
Demagnetization
Explanation:
Q.
If we look at the floating piece of iceberg on the sea, approximately what fraction of it is visible above the seawater level?
1/8th
None of these
1/10th
1/6th
Explanation:
Q.
In a semiconductors the charge carriers are ___________________?
All of the above
Electron and holes both
Holes only
Electrons only
Explanation:
Q.
The cross product i^ x j^ is equal to_______________?
One
i^
Zero
k^
Explanation:
Q.
SI unit of flux density is____________________?
NA-1m-1
NAm-1
NmA-1
NmA-2
Explanation:
Q.
A magnetic field___________________?
never exerts a force on a charged particles
always exerts a force on a charged particle
exerts a force if the charged particle is moving in the direction of the magnetic field lines
exerts a force if the charged particle is moving perpendicular to the magnetic field lines
Explanation:
Q.
The radius of geostationary orbit from the centre of the earth is nearly______________?
42000km
36000km
24000 km
18000 km
Explanation:
Q.
In obtaining an X-ray photograph of our hand we use the principle of______________?
ionization
any of above
shadow photograph
photo electric effect
Explanation:
Q.
Study of sound is called _____________?
Physiology
Soundlogy
Acoustics
Neurology
Explanation:
Q.
The unit vector in the direction of vector A = 2 i^ -2j^ + k^ is_______________?
(2i^
(2i^
2i^
(2i^
Explanation:
Q.
A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________?
(R2+f2L2)
R+1/2?fL
(R2+4?2f2L2)
(R+2?fL)
Explanation:
Q.
Unit of G is ______________?
Nm2Kg-2
Nm2Kg2
None
Nm2Kg
Explanation:
Q.
A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is_________________?
directly proportional to B
independent mass m
directly proportional to q
directly proportional to m
Explanation:
Q.
Pair production cannot take place in a vacuum as ________________?
Mass is not conserved
The chargee is not conserved
Momentum is not conserved
Energy is not conserved
Explanation:
Q.
Value of permeability of free space in SI units is___________________?
4?x10-10 WbA-1m-1
4?x10-7 WbA-1m-1
4?x10-8 WbA-1m-1
4?x10-9 WbA-1m-1
Explanation:
Q.
For what displacement the P.E becomes 1/4 of its maximum value ?
x = x
x = x
x = x
x = x(2)
Explanation:
Q.
In cricket when a bowler produce reverse swing the ball will move towards______________?
The seam of the ball
Goes straight
The shinning side of the ball
Rough side
Explanation:
Q.
The least count of Vernier caliper is ________ containing 10 Vernier scale divisions?
0.01mm
0.0001mm
0.1mm
0.001mm
Explanation:
Q.
Which instrument is used to detect path of visible rays?
Wilson Cloud Detector
None of the above
Solid State Detector
Geiger counter
Explanation:
Q.
The critical speed of an artificial satellite is_______________?
8 Kms-1
8 ms-1
7.9 Kms-1
8.1 Kms-1
Explanation:
Q.
The energy absorbed by a body is __________________ at resonance?
Maximum only
Minimum only
Maximum as well minimum
Explanation:
Q.
Newton
Non-inertial frame of reference
Inertial frame of reference
Accelerated frame of reference
None
Explanation:
Q.
Matter itself has energy called ________?
Rest energy
Potential energy
Nuclear energy
Chemical energy
Explanation:
Q.
An artificial satellite revolves round the Earth in circular orbit, which quantity remains constant?
Linear Velocity
Angular Displacement
None of the above
Angular Momentum
Explanation:
Q.
The direction of the vector product is given by______________?
Head to tail rule
Right-hand rule
Triangular rule
Left-hand rule
Explanation:
Q.
When a projectile moves upward , its vertical component of velocity?
None of these
Decrease
Remains same
increase
Explanation:
Q.
A particle having the mass of an electron and the charge of a proton is called a______________?
Positron
Gamma rays
Antiproton
Photon
Explanation:
Q.
Number of significant figures in 0.0173 is_________________?
2
3
5
4
Explanation:
Q.
Radioactivity is a ______ (A) Spontaneous activity (B) Chemical property_____________?
A & B
C & A
A B & C
B & C
Explanation:
Q.
Farad is the unit of___________?
capacitance
inductance
voltage
None of these
Explanation:
Q.
A vector can be multiplied by a number. The number may be_______________?
Dimensional scalar
All A, B and C are correct
Negative
Dimensionless
Explanation:
Q.
In Compton scattering, the change in wavelength is maxed if_______________?
The angle of scattering is 0
The angle of scattering is 90
The angle of scattering is 180
The angle of scattering is 60
Explanation:
Q.
Which of the following is a good moderator?
Graphite
Cadmium
Ordinary Water
Helium
Explanation:
Q.
Electrical resonance is observed in_______________?
Radio
Microwave oven
Both in radio and microwave oven
Neither in radio nor in a microwave oven
Explanation:
Q.
The span of the broad jump depends upon_______________?
Angle of projection
Height of jump
None
Mass of the jumper
Explanation:
Q.
The sharpness of resonance is__________________?
Equal to the square of damping force
Directly proportional to the damping force
Inversely proportional to the damping force
Equal to the square of damping force
Explanation:
Q.
The planet nearest to the earth is______________?
Venus
Sun
Mercury
Uranus
Explanation:
Q.
Coefficient of viscosity of honey is greater than______________?
Milk
Charcoal
Water
Water
Explanation:
Q.
Average translational kinetic energy per molecule of an ideal gas is given by_____________?
3Na/2RT
3NaT/2R
2NaT/3
3RT/2Na
Explanation:
Q.
What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m2 when the force acting on the wire is 5N ?
100A
10A
1A
1000A
Explanation:
Q.
If one or more of the neutrons emitted during fission cab be used to build up further fission then the reaction is self-sustained and is known as __________________?
Chemical reaction
Fission reaction
Fusion reaction
Chain reaction
Explanation:
Q.
In the nucleus of uranium, the number of neutrons will be _____________?
143
92
235
Different for different isotopes
Explanation:
Q.
Michelson calculated the speed of light using the instruments______________?
none of these
galvanometer
interferometer
spectrometer
Explanation:
Q.
Radiation produced from TV picture tube is_____________?
X-rays
B-rays
Far infrared
Infrared
Explanation:
Q.
Nuclei having the same mass number but different atomic number are____________?
Isotones
Isomers
Isotopes
Isobars
Explanation:
Q.
Normal human body temperature 98.6
410
37
55
42
Explanation:
Q.
The blood flow is _______________ flow at systolic pressure?
Turbulent
None
Laminar
Mixed
Explanation:
Q.
The uncertainty in momentum & position is due to its_____________?
Property of matter and radiation
Emission of the certain wavelength
Two-dimensional motion
Very high velocity
Explanation:
Q.
Terminal velocity of the body is directly proportional to the_______________?
The diameter of the body
Square of the diameter of the body
Size of the body
The radius of the body
Explanation:
Q.
Why gamma rays are used to kill bacteria to sterilize surgical equipment etc ?
All of above
Chargeless
Highly penetrating
Massless
Explanation:
Q.
Simple harmonic motion is a type of________________?
Rotational motion
Musical arrangement
Circular motion
Vibratory motion
Explanation:
Q.
When we excite some atoms by heat collision or electrical discharge they will________________?
emit either invisible or visible light
radiate electromagnetic energy with a continuous distribution of wavelength
absorb particular wavelengths when white light is incident on them
radiate electromagnetic energy of discrete characteristic wavelength
Explanation:
Q.
A galvanometer basically is an instrument used to ____________________?
measure voltage across a circuit
measure potential difference between two points in a circuit
measure current flowing through a circuit
detect current in a circuit
Explanation:
Q.
Errors in the transmission of power through optic fiber can be minimized by using a______________?
Graded index fiber
Single mode step index fiber
Copper wire
Multimode index fiber
Explanation:
Q.
When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?
a circle in a plane perpendicular to the field
a straight line parallel to the field
a straight line along its initial direction
a parabola in a plane perpendicular to the field
Explanation:
Q.
In laser production the state in which more atoms are in the upper state than in the lower one is called_____________?
All the above
Normal state
Inverted population
Metal stable state
Explanation:
Q.
The mass attached to a spring executes ?
Rotatory motion
Both A and C
S.H.M
Vibratory motion
Explanation:
Q.
Select an alternative from of uncertainly principle from the following_______________?
mc2 = hv
?E . ?t = h
Any of above
?E = h/m?c(1-cos?)
Explanation:
Q.
Which of the following is path funtion?
work and heat
Entropy
Enthalpy
Internal energy
Explanation:
Q.
What is the force of attraction between any two bodies by virtue of their masses is called?
Nuclear Force
Electromagnetic Force
Centripetal Force
Gravitational Force
Explanation:
Q.
The drag force is given by_________________?
Gauss law
Pascals law
Stokes law
Newtons law
Explanation:
Q.
Reverse process of photoelectric effect is_______________?
X-rays production
pair production
Compton effect
annihilation of matter
Explanation:
Q.
A voltage V = V0 cos ?t is applied across a resistor of resistance R the average power dissipated per cycle in the resistor is given by___________?
V02/?2R
2/?2?R
V/?2?R
V?/?2R
Explanation:
Q.
The magnetic field strength of solenoid is__________________?
B = ?nI
B = ?N/I
Both B and C
B = ?NI
Explanation:
Q.
A mass spectrograph (spectrometer) sorts out____________?
Ions
Elements
Isotopes
Molecules
Explanation:
Q.
If the volume of a gas is held constant and we increase its temperature then_______________?
its pressure rises
its pressure falls
its pressure is constant
any of above
Explanation:
Q.
The restoring force acting on the simple pendulum is given by_______________?
mg cos ?
mg sin ?
mg cos ?
mg sin ?
Explanation:
Q.
The angular speed of seconds hand of a watch in rads-1 is______________?
?/30
?/2
?/180
?
Explanation:
Q.
Which one is venturi relation ?
P = 1 /2?V2 = ?gh = constant
V2 = 2g (h1-h2)
A1 V1 = A2 V2 = constant
P1
Explanation:
Q.
An ammeter measures the total current flowing through a circuit when it is connected__________________?
in series with the circuit
in parallel with any of the series resistances in the circuit
in parallel with circuit
in series with any of the parallel resistances in the circuit
Explanation:
Q.
A Stone thrown from the top of a tall building follows a path that is:
Circular
Parabolic
Made of two straight line segments
Hyperbolic
Explanation:
Q.
Depletion region of a junction is formed_____________?
under reverse bias
when temperature varies
under forward bias
during the manufacturing process
Explanation:
Q.
Angle between the rectangular components of a vector is________?
30
Zero
90
45
Explanation:
Q.
The centripetal acceleration produced in a rotating body is commonly due to change on_________of body?
magnitude
direction
None of these
both
Explanation:
Q.
Which one is not correct for a vector A= 2i+2j+3k ?
Has magnitude -2
Has magnitude 2 and direction
Has direction 45
Has magnitude 2
Explanation:
Q.
The frequency of a circuit consisting of a capacitance C and a resistor R is________________?
1/ 2RC
C/R
R/C
1/RC
Explanation:
Q.
Frequency is the inverse of __________?
Gravity
Velocity
Time Period
Stress
Explanation:
Q.
Alpha particle ionizes an atom_________________?
Through direct collision
Through electrostatic repulsion
Through electrostatic attraction
All of above
Explanation:
Q.
A point where the incident parallel rays of light converge or appear to diverge after passing through a lens is called______________?
aperture
center of curvature
focus
optical center
Explanation:
Q.
Mass defect per nucleon is ___________________?
The average energy of the nucleus
All of above are one and the same thing
The binding energy of the nucleus
Packing fraction
Explanation:
Q.
One AMU is equal to__________________?
1.66 x 10-27kg
All of above
166 x 10-15ng
166 x 10-20g
Explanation:
Q.
Cos?i^ + Sin?j^ is a_________________?
The unit vector in the direction at angle ? with an x-axis
Position Vector
Vector
Vector in the direction at angle ? with an x-axis
Explanation:
Q.
In damped harmonic oscillation which one decreases ?
Both amplitude and energy
Energy of vibration
Neither amplitude nor energy
Amplitude of vibration
Explanation:
Q.
The scales of temperature are based on two fixed points which are_________________?
The temperatures of frozen and boiling mercury
The temperatures of water at 0? 100?C
The temperature of melting ice and boiling water at atmospheric pressure
The temperatures of ice cold and boiling water
Explanation:
Q.
The pressure exerted by a column of mercury 76cm high and at 0
1 Pascal
1 atmosphere
1 Newton per square meter
data is insufficient
Explanation:
Q.
If A=B, which of the following is not correct ?
|A| = |B|
A.B = A^ B^
AB^ = BA^
|A^| = |B^|
Explanation:
Q.
Two coherent sources of light produce interference (destructive) when the phase difference between them is _________?
?
?/4
2?
?/2
Explanation:
Q.
Atom is the smallest particall which is_________?
Indivisible
Divisible
Both
Non of these
Explanation:
Q.
Mach number is used in connection with the speed of___________?
Sound
Ship
Light
aircraft
Explanation:
Q.
Electromagnetic waves transport___________________?
Mass
Energy
Heat
Momentum
Explanation:
Q.
Inertia is depends upon only?
Mass
Velocity
Time
Direction
Explanation:
Q.
The uncertainty in a measurement may occur due to_______________?
Natural variation of the object to be measured
Inadequate technique
Limitation of an instrument
All given in A, B and C
Explanation:
Q.
The shaft of a motor rotates at a constant angular speed of 360rev/min. Angle turned through in 1 sec in radian is________________?
3?
?
6?
12?
Explanation:
Q.
At resonance the value of the power factor in an L-C-R series circuit is_______________?
Zero
1
Not definite
2
Explanation:
Q.
The radiations emitted form hydrogen filled discharge tube show____________?
line spectrum
absorption spectrum
band spectrum
continuous spectrum
Explanation:
Q.
The energy of SHM is maximum at_______________?
In between mean and extreme
Mean position
Extreme position
All positions during SHM
Explanation:
Q.
A body can have constant velocity when it follows a_____________?
Rectilinear path
Elliptical path
Parabolic path
Circular path
Explanation:
Q.
When a body is whirled in a horizontal circle by means of a string the centripetal force is supplied by______________?
Mass of a body
The tension in the string
Velocity of body
Centripetal acceleration
Explanation:
Q.
The velocity of laser light is___________________?
Equal to ordinary light
More than ordinary light
Different for different colours or frequency
Less than ordinary light
Explanation:
Q.
A sensitive galvanometer gives full-scale deflection with 100 mV. If the resistance of the galvanometer is 50? the maximum current that can flow through safely is__________________?
2.0 mA
20 mA
200 mA
0.2 mA
Explanation:
Q.
A stone is thrown upward from the top of a 59.4m high cliff with an upward velocity component of 19.6m/s how long is the stone in the air?
5.00 s
6.00 s
7.00 s
4.00 s
Explanation:
Q.
What is the minimum number of unequal magnitude vectors required to get a null vector?
Zero
Three
Two
None
Explanation:
Q.
We can produce heat by________________?
All of the above
Electrical processes
Frictional process
Chemical processes
Explanation:
Q.
A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is _____________________?
F=1/Bsin?
F=1/B
F=1/Bcos?
F/0
Explanation:
Q.
Laminar flow usually occurs at speeds_____________?
Very high
High
Low
Some time high and some time low
Explanation:
Q.
Which one is not a branch of physical sciences ?
Astronomy
Chemistry
Geology
Biology
Explanation:
Q.
The value of critical angle for glass is_______________?
50
52
42
47
Explanation:
Q.
Electron cannot exist in the nucleus it is confirmed by observing that______________?
Its size as compare to proton and neutron is very small
The velocity of electron must be very high according to uncertainty principle
It does emit radiation
No antiparticle of electron is present
Explanation:
Q.
The maximum safe limit dose for persons working in a nuclear power station is ________________?
5 rem per week
1 rem per week
3 rem per week
4 rem per week
Explanation:
Q.
Triple point of water is_____________________?
273.16
273K at 61.6 Kpa
273
273.16K at 750 Kpa
Explanation:
Q.
In case of planets the necessary acceleration is provided by______________?
Coulomb force
Frictional force
Gravitational force
Centripetal force
Explanation:
Q.
Average distance covered by alpha particles in the air before its ionizing power ceases is called its_________________?
Firing level
Range
Trajectory
Limit
Explanation:
Q.
The speed of the fluid is maximum in the venturi meter at_______________?
None of these
Convergent duct
Throat
Divergent duct
Explanation:
Q.
Many of the semi conductors are crystals of the type__________________?
Simple cubic
Body centred cubic
Face centred cubic
All of the above
Explanation:
Q.
Which instrument is suitable to measure the internal diameter of a test tube?
Vernier Callipers
None
Bore Gauge
Screw Gauge
Explanation:
Q.
Which one is the highest power multiple ?
Deca
Mega
Giga
Beta
Explanation:
Q.
Which one is not an example of adiabatic process ?
conversion of water into ice in refrigerator
cloud formation in the atmosphere
rapid expansion of air
rapid escape of air from a burst tyre
Explanation:
Q.
A convex lens gives a virtual image only when the objects lies_________________?
between principal focus and optical center
beyond 2 f
between principal focus and center of curvature
at the principal focus
Explanation:
Q.
The magnitude of i^. (j^ x k^) is________________?
1
-1
i^
Explanation:
Q.
The energy radiated is directly proportional to the fourth power of Kelvins temperature is________________?
Karl-Weins law
Rayleigh-Jeans law
Stephens law
Plancks
Explanation:
Q.
Rain drops fall from great height Which among the following statements is true regarding it?
their velocity increases and they fall with same velocity on the earth
they fall with same ultimate velocity
their velocity increases and they fall with different velocity on the earth
they fall with that ultimate velocity, which are different for different droplets
Explanation:
Q.
Wave-like characteristic of electron is demonstrated by______________?
Line spectrum of atoms
Production of x-rays.
Diffraction by crystalline solids
Photoelectric effect
Explanation:
Q.
In half-wave rectification the output D.C. voltages is obtained across the load for_______________?
The positive half cycle of A.C.
The positive and negative half cycles
Either positive or negative half of A.C.
The negative half cycle of A.C.
Explanation:
Q.
In which process entropy remains constant________________?
isothermal
isobaric
isochoric
adiabatic
Explanation:
Q.
An electromagnetic wave consists of _____________________?
Magnetic field moving with velocity of light in space
Electric and magnetic fields moving parallel to each other
Electric and magnetic fields moving perpendicular to each other
Electric field moving with velocity of light
Explanation:
Q.
Magnification of the astronomical telescope is_____________?
fo/fe
(1+fo/fe)L/fo
fe/fo
fo+fe
Explanation:
Q.
The owl can see most clearly in total darkness because:
it has large eyes with orbs directed forward, giving it binocular sight
it has squint eyes
it has light bulbs in its eyes provided by nature
it produces infrasonic sounds
Explanation:
Q.
When the coil of the galvanometer is in equilibrium then the deflecting couple is____________________?
equal to the restoring couple
smaller than the restoring couple
greater than the restoring couple
zero
Explanation:
Q.
For ___________ flow the path of the fluid particles cannot be tracked?
Turbulent
Laminar
Both A and B
Streamline
Explanation:
Q.
A man standing near a fast moving train may fall___________?
On himself
On the train
Towards the train
Away from the train
Explanation:
Q.
Which one does not work according to resonance ?
Bulb
Radio
Microwave oven
T.V
Explanation:
Q.
Which one of the following radiations has the strongest photon?
Microwaves
X-rays
?-rays
T.V waves
Explanation:
Q.
The profile of aeroplane wing which lifts it up is called as_____________?
Curved profile
Aerofoil profile
None of these
Wing shape
Explanation:
Q.
If a lift is going up with acceleration, the apparent weight of a body is:
Equal to the true weight
Less than the true weight
More than the true weight
More or less the true weight
Explanation:
Q.
Which one of following postulate is in accordance with the Rutherfords model ?
discrete spectra for atoms
no spectrum
continuous spectra for atoms
either continuous nor discrete
Explanation:
Q.
Excited atoms return to their ground state in_______________?
10-9s
10-6s
10-10s
10-8s
Explanation:
Q.
A cyclist cycling around a circular racing track skids because_____________?
the centripetal force upon him is greater than limiting friction
the centripetal force upon him is less than limiting friction
the centripetal force upon him is equal to the limiting friction
the friction between the tyres of the cycle and road vanishes
Explanation:
Q.
While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________?
a steady voltage cell is used
a most sensitive galvanometer is used
the balance point is close to the middle of the wire
a high resistance box is used in one of its gap
Explanation:
Q.
The system which can exchange matter as well as energy with its surroundings is called____________?
open system
Closed system
Isolated system
Inert system
Explanation:
Q.
Minimum number of communication satellites required to cover the whole earth is______________?
2
4
5
3
Explanation:
Q.
The unit of power is _________?
Newton
watt
Joule
Pascal
Explanation:
Q.
Total number of series in hydrogen spectrum is_____________?
three
four
six
five
Explanation:
Q.
Materials that undergo plastic deformation before breaking are called __________________?
Brittle
Ductile
Polymers
Amorphous
Explanation:
Q.
The distance between any two consecutive nodes or antinodes in a stationary wavelength (?) is _________?
?/4
?/2
?/8
?
Explanation:
Q.
The phase angle between the voltage and the current in an AC circuit consisting of a resistance is______________?
Zero
180
45
90
Explanation:
Q.
According to which one of following law the density of atom is uniform ?
Bohrs model
Rutherfords model
All of the above laws contradict the statement
J.J.Thomson model
Explanation:
Q.
Standard condition STP refer to a gas at ___________________?
76cm 0
1atm 273K
760mm 273K
all of the above
Explanation:
Q.
Name the SI unit having the symbol cd?
Second
Cm
Ampere
Candela
Explanation:
Q.
Kirchhoff
both
IR Drops
Battery emf
junction voltages
Explanation:
Q.
I ^. (j^ x k^) is equal to______________?
j^
1
i^
k^
Explanation:
Q.
If we whirl a stone at the end of a string in the vertical circle, it is likely to break when the stone is________________?
At any point during motion
At the highest point
At the lowest point
At the point where gravity is not acting
Explanation:
Q.
A convex lens acts as a diverging lens if the_________________?
object is beyond C
if the object is within f
both B and C
if the object is with in C
Explanation:
Q.
In a clinical thermometer the mercury in the capillary tube does not contract once removed from the patient because_______________?
The capillary tube has a small constriction near the bulb
The amount of mercury use is very small
Mercury takes a long time to contract
The capillary tube is very narrow
Explanation:
Q.
In optic fiber transmission the repeater are separated through a distance of __________ km in newer system?
300km
200km
20km
100km
Explanation:
Q.
Random errors can be reduced by_______________?
Comparing the instrument with another more accurate one
Taking mean of several measurements
Taking zero correction
All methods explained in A, B and C
Explanation:
Q.
Which of the following is used to control rods in nuclear fission?
Cadmium
Heavy Water
All of these
Graphite
Explanation:
Q.
If n number of the photon is striking on a metal surface then total momentum exerted is_______________?
n
p
None
Explanation:
Q.
If the wavelength of incident radiation is increased in photoemission then_________________?
The maximum kinetic energy of the photoelectrons increases
The average kinetic energy of the photoelectrons decreases
The minimum kinetic energy of the photoelectrons decreases
The minimum kinetic energy of the photoelectrons increases
Explanation:
Q.
The metastable state for an atom in laser light is_____________?
10-4 sec
10-5 sec
10-8 sec
10-3 sec
Explanation:
Q.
Unit of power of a lens is________________?
diopter
horsepower
watt
meter
Explanation:
Q.
In n-p-n transistor, p works as______________?
emitter
any of above
collector
base
Explanation:
Q.
A three-dimensional image is obtained by________________?
Magnetic imaging
Electron microscope
None of the above
Scanning electron microscope
Explanation:
Q.
If an object is placed away from 2f of a converging lens then the image will be_______________?
real and erect
virtual
real and inverted
virtual and erect
Explanation:
Q.
In an angular motion, Newton
F=?p/It
?? = I ?
F=ma
All above
Explanation:
Q.
The charge on neutron is_______________?
Plus 1.6 x 10-19C
No definite charge
Zero
Minus 1.6 x 10-19C
Explanation:
Q.
Neutron was discovered by: _________?
Neil Bohr
Rutherford
Einstein
Chadwick
Explanation:
Q.
Medium which sends signal from source to destination is known as ________ ?
Hardware
Transmission channel
Transmitter
Receiver
Explanation:
Q.
Mark the wrong statement ?
a frame of reference which is either at rest or moves with a constant velocity is called an inertial frame of reference
all the frames of reference in uniform rectilinear motion are equivalent
an un-accelerated frame of reference is called an inertial frame of reference
Newtons laws of motion are valid in an accelerated (non inertial) frame of reference
Explanation:
Q.
The light used in optical fiber transmission is________?
Pentachromatic
Dichromatic
Monochromatic
None of these
Explanation:
Q.
The number of categories in which physical quantities are divided is_____________?
2
1
4
3
Explanation:
Q.
Product of wavelength and time period is _______________?
Velocity
Wavelength
Time period
Frequency
Explanation:
Q.
Which one of the following has the largest energy content ?
106 photons of wavelength 200nm (UV)
103 photons of wavelength 2 pm (?-rays)
102 photons of wavelength 1nm (x-rays)
106 photons of wavelength 50?m (infrared)
Explanation:
Q.
Forced vibration is known as_____________________?
Natural vibration
Free vibration
Simple harmonic vibration
Driven harmonic vibration
Explanation:
Q.
The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is__________________?
Average current
r.m.s current
Sinusoidal current
Net current
Explanation:
Q.
The efficiency of the Carnot engine working between 150
100%
23.6%
50%
29.4%
Explanation:
Q.
Total distance travelled by a bob of the simple pendulum in one vibration is equal to________________?
Square of the amplitude
2 x amplitude
4 x amplitude
Amplitude
Explanation:
Q.
A 100
100?
50?
32?
62?
Explanation:
Q.
Two parallel wires carrying currents in the opposite directions____________________?
repel each other
have no effect upon each other
attract each other
they cancel out their individual magnetic fields
Explanation:
Q.
An inductor may store energy in ________________?
Its electric field
Its magnetic field
Both electric and magnetic fields
Its coils
Explanation:
Q.
Which one of the following has the highest value of specific heat?
Alcohol
Methane
Water
Kerosene
Explanation:
Q.
The core of a transformer is laminated to reduce energy losses due to__________?
None of these
Eddy currents
Hysteresis
Resistance in winding
Explanation:
Q.
During an encounter with an atom alpha particle knocks out ______________?
Nothing
Protons
Electrons
Neutrons
Explanation:
Q.
To find the r.m.s value of an alternating current mathematically we need to have ________________?
Mean value of I2
Square root of mean value of I2
Square root of I2
Square of 1/2
Explanation:
Q.
The ratio of displacement to distance can not be___________?
Equal to one
Less than one
All are possible
Greater than one
Explanation:
Q.
The especially designed semiconductor diodes used as indicator lamps in electronic circuits are___________?
The photo diodes
Solar cells.
The light emitting diode
The switch
Explanation:
Q.
Which of the following can not be the resultant of two vectors having magnitude 10N and 15N?
25N
22N
18N
30N
Explanation:
Q.
The acceleration of a projection on the diameter for a particle moving along a circle is_______________?
w2x
wx2
wx2
w2x
Explanation:
Q.
n an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then_______________?
V2 = VR2+(VL-VC)2
V2 = VL2+(VR-VC)2
V2 = VR2+VL2+VC2
Explanation:
Q.
An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the length of meter stick is________________?
greater than one meter
less than one meter
a foolish question
one meter
Explanation:
Q.
Which of the following is reverse process of composition of vectors?
Addition of vectors
Multiplication of vectors
Subtraction of vectors
Resolution of vectors
Explanation:
Q.
Ratio of the weight of H-atom to that of an electron is approximately______________?
18360
1836
18.336
183.6
Explanation:
Q.
A satellite moving around the earth constitutes______________?
An inertial frame of reference
Both inertial and non-inertial
Non-inertial frame
Neither inertial nor non-inertial
Explanation:
Q.
The symbol of the prefix used for Mega is_______?
h
M
G
E
Explanation:
Q.
The relativistic energy E is equivalent to relativistic mass given by_______________?
Ec2
E/c2
c2/E
E/c
Explanation:
Q.
The period of a circular motion is given by_______________?
T = ?w
T = ?v
T = 2?r
T = 2?r/v
Explanation:
Q.
The unit of force is _________ and its symbol is ______________ Which is the correct pair ?
Newton, N
newton, n
newton, N
Newton, n
Explanation:
Q.
The size of one degree of Celsius is equal to_________________?
One degree of Fahrenheit scale
2.12 degrees of Fahrenheit scale
3.2 degrees of Fahrenheit scale
1.8 degrees of Fahrenheit scale
Explanation:
Q.
1024 can be written in scientific notation as______________?
0.000976
2 Raised to power 10
1.024
1/0.00097
Explanation:
Q.
The electric P.E of an electron in an orbit at a distance rn from the positive charge_____________?
Ke2/rn
Ke2/rn2
Explanation:
Q.
A___________has no size or shape, just position.
point
vertex
line
bottom
Explanation:
Q.
During the fission process a large amount of______________?
Light energy is released
Chemical energy is released
Heat energy is released
Nuclear energy is released
Explanation:
Q.
Centripetal force performs_______________?
No work
Maximum work
Negative work
Minimum work
Explanation:
Q.
Which branch of science plays an important role in the development of technology and engineering ?
Biology
Physics
Chemistry
Geology
Explanation:
Q.
Temperature is a property which determines_________________?
Whether a body will feel hot or cold to touch
How much total absolute energy a body has
How much heat a body contains
In which direction heat will flow between two systems
Explanation:
Q.
A vector can have maximum________components in a plane.?
Three
Two
Infinite
Zero
Explanation:
Q.
Which one of the following is not an electromechanical instrument ?
galvanometer
voltmeter
ammeter
AC transformer and DC generator
Explanation:
Q.
In fission process_______.
massive nucleus splits to form smaller fragments
both A & B
massive nucleus join together
None of these
Explanation:
Q.
A low resistance which can bypass a current is: _____________?
Multiplier
Divider
Shunt
None of these
Explanation:
Q.
1atm is equal to
101.3 kPa
760 mmHg
760 torr
all of the above
Explanation:
Q.
In vibratory motion_________________?
total energy remains constant
K E remain constant
P E remains constant
total momentum remains constant
Explanation:
Q.
Potential energy means?
None of these
Due to position of object
Due to motion of object
Due to gravity
Explanation:
Q.
Smaller the least count of the instrument more is the measurement________________?
Accurate and precise
Precise
None of these
Accurate
Explanation:
Q.
A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber ?
0.2
0.5
5
2
Explanation:
Q.
For normal adjustment, length of astronomical telescope is______________?
fo / fe
fe / fo
fo + fe
fo
Explanation:
Q.
In a photoelectric effect monochromatic light is incident on a metal surface. If the incident light of twice the intensity but of same wavelength the kinetic energy of the emitted electron_______________?
Becomes double
Remains same
First increases then decrease because of the curvilinear graph
Becomes half
Explanation:
Q.
A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________?
f2
f1f2/f1-f2
f1f2/f2+f1
f2 + f1
Explanation:
Q.
The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12?. Galvanometer resistance is_____________?
18?
30?
12?
24?
Explanation:
Q.
The rotational K.E of the hoop is equal to the______________?
its translational K.E
four times than its translational K.E
half than its translational K.E
double than its translational K.E
Explanation:
Q.
The time period of a second pendulum is______________?
6 seconds
4 seconds
2 seconds
3 seconds
Explanation:
Q.
Heating a magnet will ____________________?
strengthen it
demagnetize it completely
weaken it
reverse its polarity
Explanation:
Q.
According to Pascals law the pressure of gas in a vessel is_____________?
Same only along normal directions
Same in all direction
Different in different direction
Same only along opposite directions
Explanation:
Q.
The charge on alpha particles is________________?
Minus two
Minus one
Plus one
Plus two
Explanation:
Q.
Any alteration produced in shapes length or volume when a body is subjected to some external force is called____________________?
Toughness
Stiffness
Extension
Deformation
Explanation:
Q.
Bernoulli
Momentum
Fluid
Energy
Mass
Explanation:
Q.
We prefer mercury as a thermometric substance because______________?
It does not stick to thermometer glass
All of above
Over a wide range of temperature its expansion is uniform
It opaque to light
Explanation:
Q.
The number of significant figures in 5.400 is________________?
None
3
5
2
Explanation:
Q.
A vector can have maximum________components in space.?
Infinite
Two
Zero
Three
Explanation:
Q.
A ball is thrown towards the earth and bounce back. During this process:
Direction of Displacement, Velocity and acceleration changes
Direction of Displacement and acceleration changes
Direction of Displacement and Velocity changes
Direction of velocity and acceleration changes
Explanation:
Q.
Photon of highest frequency will be absorbed when transition takes place from_____________?
3rd to 5th orbit
4th to 5th orbit
1st to 5th orbit
2nd to 5th orbit
Explanation:
Q.
The speed of light will be minimum while passing through ?
Vaccum
Glass
Water
Air
Explanation:
Q.
What is unit of conductivity?
Ohm
None of these
Watt
mho
Explanation:
Q.
Transuranic elements have an atomic number_______________?
Greater than 72
Greater than 92
Greater than 102
Greater than 82
Explanation:
Q.
Ammeter connected in an AC circuit measures______________?
The peak value of the current
The exact value of the current
RMS value of the current
The net value of the current
Explanation:
Q.
In a multi range ammeter as the range increases _____________________?
shunt value decreases
none of the above
shunt value increases
shunt value remains the same
Explanation:
Q.
A black body emitting all the radiation in the visible region appears________.
Green
White
Blue
Black
Explanation:
Q.
Addition of vectors obeys_______law?
Commutative Law
Distributive Law
Associative Law
All of these
Explanation:
Q.
Two fog droplets have radius 2:3 their terminal velocities are_______________?
2:09
4:06
4:09
4.3
Explanation:
Q.
The function of collimeter in spectrometer is________________?
no function
to make them
to produce parallel beams of light
to filter the light rays
Explanation:
Q.
Stokes law is applicable if body has __________shape?
Circular
Rough
Spherical
Square
Explanation:
Q.
The penetration power of alpha particle as compared to beta particle is_______________?
10 times less
100 times less
100 times more
10 times more
Explanation:
Q.
With the increase of pressure, the boiling point of any substance:
Increases
Remains same
Decreases
Becomes Zero
Explanation:
Q.
A force On particle is conservative if:________?
It
It
It work depends on the end points of every motion, not on the path between
It
Explanation:
Q.
If a vector ? is making an angle
Ay= ACos?
Ax= ACos?
None
Ay= ASin?
Explanation:
Q.
Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________?
magnetic field intensity
magnetic induction
self inductance
magnetic flux
Explanation:
Q.
Compton
Stefan Boltzman
Arthur Holly Compton
Marley
Mosely
Explanation:
Q.
The co efficient of linear expansion is equal to__________?
?L/L?T
?L?T-?L
?L = ?L?T
L?T/?L
Explanation:
Q.
The magnitude of the cross product is equal to the dot product between them. The angle between the two vectors is________________?
180
30
45
60
Explanation:
Q.
An alternating current or voltage_____________________?
fluctuates off and on
changes its direction again and again
varies in magnitude alone
changes its magnitude harmonically and reverses its direction of flow after regularly recurring intervals
Explanation:
Q.
In multimode step index fibre the refractive index of core and cladding is____________?
different with refractive index of core higher than cladding
different
zero
same
Explanation:
Q.
Beta particles ionize an atom_________________?
Due to the gravitational force
Due to the electrostatic force of repulsion
Due to a direct collision
Due to the electrostatic force of attraction
Explanation:
Q.
The dimension of torque is______________?
[ML-2T-2]
[ML2T]
[ML2T-2]
[MLT-2]
Explanation:
Q.
If a wheel of radius r turns through an angle of 30
?/6 x r
V/30 x r
? / 180 x r
? /3 x r
Explanation:
Q.
Linear momentum of a photon is_______________?
hv/c
c2/hv
zero
hv/c2