TOP 100 Physics MCQS
All Questions for: TOP 100 Physics MCQS
Question 401: A vacant or partially filled band is called _____________________?
- A Valence band
- B Forbidden band
- C Conduction band
- D Empty band
Explanation:
Question 402: If a wire has a resistance of 0.5 ohm, then its conductance is:
- A 2 S
- B 1 S
- C 5 S
- D 1.5 S
Explanation:
Question 403: When average and instantaneous velocities become equal then body possess_______?
- A Variable Velocity
- B Uniform Velocity
- C Variable Acceleration
- D Uniform Acceleration
Explanation:
Question 404: In p-n-p transistor the collector current is________________?
- A equal to emitter current
- B any of above
- C greater than emitter current
- D slightly less than emitter current
Explanation:
Question 405: One radian is equal to______________?
- A 87.3
- B 67.3
- C 57.3
- D 60
Explanation:
Question 406: Force 100N is applied on a wire produces extension 5mm in it. Energy stored in it is
- A 0.250 J
- B 1 J
- C 0.125 J
- D 0.50 J
Explanation:
Question 407: 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 ?
- A Only (i)
- B Only (iii)
- C Only (ii)
- D Both (i) and (ii)
Explanation:
Question 408: Maximum number of components of a vector may be________________?
- A Infinite
- B 3
- C 1
- D 2
Explanation:
Question 409: A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ?
- A 2 volt
- B 5 volt
- C 0.4 volt
- D 4 volt
Explanation:
Question 410: The velocity of the mass attached to a spring is maximum at_______________?
- A Mean position
- B None
- C Both A and B
- D Extreme position
Explanation:
Question 411: Velocity of fluid increases where the pressure is________________?
- A Changes continuously
- B Low
- C Constant
- D High
Explanation:
Question 412: The charge on an electron was determine by ________________?
- A Millikan
- B Thomson
- C Ampere
- D Maxwell
Explanation:
Question 413: One torr is equal to_________________?
- A 13.33 Nm-2
- B 1.333 Nm-2
- C .1333 Nm-2
- D 133.3 Nm2
Explanation:
Question 414: A force applied on a body through the string is called_________?
- A Weight
- B Momentum
- C Tension
- D Torque
Explanation:
Question 415: If the length of the second pendulum becomes four times, then its time period will become________________?
- A 4 times
- B 8 times
- C 6 times
- D 2 times
Explanation:
Question 416: 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______________?
- A Equal to the weight of the stone
- B Zero
- C Less than the weight of the stone
- D Maximum
Explanation:
Question 417: A transmitting station emits radio waves of wavelength ? at power P. If h is Planck
- A ?
- B Speed of lightB.
- C h
- D Speed of sound
Explanation:
Question 418: If capacitance of L-C circuit is made four times then frequency of the circuit becomes___________________?
- A One half
- B Four times
- C None
- D Twice
Explanation:
Question 419: In normal state of energy the incident high energy photons will be______________?
- A Cause laser production
- B Stimulated
- C Cause X-ray emission
- D Absorbed
Explanation:
Question 420: Various types of cancer are treated by_________________?
- A Strontium-90
- B Cobalt-60
- C Carbon-14
- D Nickel-63
Explanation:
Question 421: The most suitable unit for expressing nuclear radius is_______?
- A Angstrom
- B Nano meter
- C Fermi
- D Micro
Explanation:
Question 422: When A.C current passes through a capacitor then the current relationship will be_______________?
- A The voltage leads current by phase angle is 45 degrees
- B The voltage leads current by phase angle is 90 degrees
- C The current lead voltage by phase angle is 45 degrees
- D The current lead voltage by phase angle is 90 degrees
Explanation:
Question 423: Concentration of red cells in blood is about______________?
- A 40%
- B 25%
- C 75%
- D 50%
Explanation:
Question 424: Reflecting mirrors in laser is used to______________?
- A All
- B Further stimulation
- C Lasing more
- D For producing more energetic lasers
Explanation:
Question 425: Which of the following are not deflected by electric and magnetic fields ?
- A Beta rays
- B Alpha rays
- C None of these
- D Gamma rays
Explanation:
Question 426: X-rays are electromagnetic waves like________________?
- A ?-rays
- B Microwaves
- C Heat waves
- D Light waves
Explanation:
Question 427: Quality of X-rays depends upon ____________ A-filament current B-accelerating voltage C-material of the target ?
- A B & C
- B A B & C
- C A & C
- D A & B
Explanation:
Question 428: The slope of velocity-time graph gives_______?
- A Velocity
- B Acceleration
- C Speed
- D All of these
Explanation:
Question 429: A football is kicked at 45 degrees with horizontal with K.E of E. Its K.E. at highest point is
- A Zero
- B E/2
- C E/(2)
- D E
Explanation:
Question 430: The waves which are used for line of sight (LOS) communication are called:
- A Cable waves
- B Space waves
- C None of these
- D Antenna waves
Explanation:
Question 431: The anti-matter is composed of: __________________?
- A Anti-neutron
- B Anti-proton
- C All of these
- D Anti-electrons
Explanation:
Question 432: The minimum wavelength of X-rays can further be reduced by _______________?
- A Increasing the temperature of the filament.
- B Using a target element of higher atomic number
- C Reducing the pressure or cooling the target
- D Increasing the potential difference between the cathode and the target
Explanation:
Question 433: Which one is true for internal energy ?
- A It is a state function of a system
- B All are correct
- C It is sum of all forms of energies associated with molecules of a system
- D It is proportional to transnational K.E of the molecules
Explanation:
Question 434: Energy needed to magnetize and demagnetize is represented by _________________?
- A Hysteresis loop
- B Hysteresis loop area
- C Hysteresis curve
- D Straight line
Explanation:
Question 435: Least distance of distinct vision_____________?
- A increases with increase in age
- B decreases with increase in age
- C neither increases nor decreases
- D becomes infinite after 60 years
Explanation:
Question 436: Venturi meter is used to measure_________________?
- A Fluid density
- B Fluid pressure
- C Fluid speed
- D None
Explanation:
Question 437: The carburettor of a car is an application of_______________?
- A None
- B Both A and B
- C Bernoulli equation
- D Venturi meter
Explanation:
Question 438: In He-Ne laser the lasing action is produced by_______________?
- A Electrons of He
- B Electrons Ne
- C He-Ne both
- D Ne only
Explanation:
Question 439: Non-inverting amplifier circuits have____________?
- A A very high input impedance
- B None of the above
- C A low output impedance
- D A very low input impedance
Explanation:
Question 440: A.C. and D.C. have the same __________?
- A Affect in charging a capacitor
- B Heating effect through a resistance
- C Affect while passing through an inductance
- D Affect in charging a battery
Explanation:
Question 441: An alpha particle is emitted from 88Ra226. What is the mass and atomic number of the daughter nucleus ?
- A 222
- B 220
- C 224
- D 226
Explanation:
Question 442: Young
- A Gas only
- B Solid only
- C Liquid only
- D All of the above
Explanation:
Question 443: For anti-parallel vectors angle is equal to ____________?
- A None of these
- B 90
- C 270
- D 180
Explanation:
Question 444: The vector A= 2i^+2j^ makes_______ angle with x-axis.?
- A 30
- B 90
- C 60
- D 45
Explanation:
Question 445: Which of the following pairs does not have identical dimensions ?
- A Energy and work
- B Torque and energy
- C Momentum and impulse
- D Mass and moment of inertia
Explanation:
Question 446: The fission chain reaction in a nuclear reactor can be controlled by introducing _______________?
- A Platinum rods
- B Iron rods
- C Graphite rods
- D Cadmium rods
Explanation:
Question 447: The power of a concave lens is_______________?
- A real
- B virtual
- C negative
- D positive
Explanation:
Question 448: Product of time period and frequency is ____________?
- A Velocity
- B Unity
- C Time period
- D Frequency
Explanation:
Question 449: Mirage is an example of ___________?
- A Scattering of light
- B refraction of light
- C Refraction and total internal reflection of light
- D reflection of light
Explanation:
Question 450: A hoop and disc have same mass and radius. Their rotational K.E are related by an equation______________?
- A K.E hoop = 4K.E disc
- B K.E hoop = 2K.E disc
- C K.E hoop = 1/2K.E disc
- D K.E hoop = K.E disc
Explanation: