TOP 100 Physics MCQS
All Questions for: TOP 100 Physics MCQS
Question 551: At resonance the value of the power factor in an L-C-R series circuit is_______________?
- A 2
- B Zero
- C 1
- D Not definite
Explanation:
Question 552: The radiations emitted form hydrogen filled discharge tube show____________?
- A line spectrum
- B band spectrum
- C absorption spectrum
- D continuous spectrum
Explanation:
Question 553: The energy of SHM is maximum at_______________?
- A All positions during SHM
- B Extreme position
- C Mean position
- D In between mean and extreme
Explanation:
Question 554: A body can have constant velocity when it follows a_____________?
- A Elliptical path
- B Circular path
- C Rectilinear path
- D Parabolic path
Explanation:
Question 555: When a body is whirled in a horizontal circle by means of a string the centripetal force is supplied by______________?
- A Mass of a body
- B Centripetal acceleration
- C The tension in the string
- D Velocity of body
Explanation:
Question 556: The velocity of laser light is___________________?
- A Less than ordinary light
- B Equal to ordinary light
- C Different for different colours or frequency
- D More than ordinary light
Explanation:
Question 557: 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__________________?
- A 20 mA
- B 2.0 mA
- C 0.2 mA
- D 200 mA
Explanation:
Question 558: 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?
- A 4.00 s
- B 6.00 s
- C 5.00 s
- D 7.00 s
Explanation:
Question 559: What is the minimum number of unequal magnitude vectors required to get a null vector?
- A Zero
- B Two
- C None
- D Three
Explanation:
Question 560: We can produce heat by________________?
- A Electrical processes
- B All of the above
- C Chemical processes
- D Frictional process
Explanation:
Question 561: A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is _____________________?
- A F/0
- B F=1/Bsin?
- C F=1/Bcos?
- D F=1/B
Explanation:
Question 562: Laminar flow usually occurs at speeds_____________?
- A Low
- B Very high
- C Some time high and some time low
- D High
Explanation:
Question 563: Which one is not a branch of physical sciences ?
- A Chemistry
- B Astronomy
- C Biology
- D Geology
Explanation:
Question 564: The value of critical angle for glass is_______________?
- A 47
- B 50
- C 42
- D 52
Explanation:
Question 565: Electron cannot exist in the nucleus it is confirmed by observing that______________?
- A It does emit radiation
- B Its size as compare to proton and neutron is very small
- C No antiparticle of electron is present
- D The velocity of electron must be very high according to uncertainty principle
Explanation:
Question 566: The maximum safe limit dose for persons working in a nuclear power station is ________________?
- A 3 rem per week
- B 5 rem per week
- C 4 rem per week
- D 1 rem per week
Explanation:
Question 567: Triple point of water is_____________________?
- A 273
- B 273.16K at 750 Kpa
- C 273K at 61.6 Kpa
- D 273.16
Explanation:
Question 568: In case of planets the necessary acceleration is provided by______________?
- A Coulomb force
- B Gravitational force
- C Centripetal force
- D Frictional force
Explanation:
Question 569: Average distance covered by alpha particles in the air before its ionizing power ceases is called its_________________?
- A Limit
- B Trajectory
- C Range
- D Firing level
Explanation:
Question 570: The speed of the fluid is maximum in the venturi meter at_______________?
- A Throat
- B Convergent duct
- C Divergent duct
- D None of these
Explanation:
Question 571: Many of the semi conductors are crystals of the type__________________?
- A All of the above
- B Body centred cubic
- C Face centred cubic
- D Simple cubic
Explanation:
Question 572: Which instrument is suitable to measure the internal diameter of a test tube?
- A None
- B Vernier Callipers
- C Bore Gauge
- D Screw Gauge
Explanation:
Question 573: Which one is the highest power multiple ?
- A Deca
- B Beta
- C Giga
- D Mega
Explanation:
Question 574: Which one is not an example of adiabatic process ?
- A rapid escape of air from a burst tyre
- B conversion of water into ice in refrigerator
- C cloud formation in the atmosphere
- D rapid expansion of air
Explanation:
Question 575: A convex lens gives a virtual image only when the objects lies_________________?
- A between principal focus and center of curvature
- B between principal focus and optical center
- C at the principal focus
- D beyond 2 f
Explanation:
Question 576: The magnitude of i^. (j^ x k^) is________________?
- A i^
- B 1
- C -1
Explanation:
Question 577: The energy radiated is directly proportional to the fourth power of Kelvins temperature is________________?
- A Karl-Weins law
- B Rayleigh-Jeans law
- C Stephens law
- D Plancks
Explanation:
Question 578: Rain drops fall from great height Which among the following statements is true regarding it?
- A they fall with that ultimate velocity, which are different for different droplets
- B their velocity increases and they fall with same velocity on the earth
- C they fall with same ultimate velocity
- D their velocity increases and they fall with different velocity on the earth
Explanation:
Question 579: Wave-like characteristic of electron is demonstrated by______________?
- A Production of x-rays.
- B Line spectrum of atoms
- C Photoelectric effect
- D Diffraction by crystalline solids
Explanation:
Question 580: In half-wave rectification the output D.C. voltages is obtained across the load for_______________?
- A The positive and negative half cycles
- B The negative half cycle of A.C.
- C Either positive or negative half of A.C.
- D The positive half cycle of A.C.
Explanation:
Question 581: In which process entropy remains constant________________?
- A adiabatic
- B isobaric
- C isochoric
- D isothermal
Explanation:
Question 582: An electromagnetic wave consists of _____________________?
- A Electric and magnetic fields moving parallel to each other
- B Electric and magnetic fields moving perpendicular to each other
- C Electric field moving with velocity of light
- D Magnetic field moving with velocity of light in space
Explanation:
Question 583: Magnification of the astronomical telescope is_____________?
- A (1+fo/fe)L/fo
- B fe/fo
- C fo/fe
- D fo+fe
Explanation:
Question 584: The owl can see most clearly in total darkness because:
- A it has large eyes with orbs directed forward, giving it binocular sight
- B it has squint eyes
- C it produces infrasonic sounds
- D it has light bulbs in its eyes provided by nature
Explanation:
Question 585: When the coil of the galvanometer is in equilibrium then the deflecting couple is____________________?
- A zero
- B equal to the restoring couple
- C greater than the restoring couple
- D smaller than the restoring couple
Explanation:
Question 586: For ___________ flow the path of the fluid particles cannot be tracked?
- A Streamline
- B Turbulent
- C Laminar
- D Both A and B
Explanation:
Question 587: A man standing near a fast moving train may fall___________?
- A Towards the train
- B On the train
- C Away from the train
- D On himself
Explanation:
Question 588: Which one does not work according to resonance ?
- A Radio
- B Microwave oven
- C Bulb
- D T.V
Explanation:
Question 589: Which one of the following radiations has the strongest photon?
- A ?-rays
- B X-rays
- C T.V waves
- D Microwaves
Explanation:
Question 590: The profile of aeroplane wing which lifts it up is called as_____________?
- A None of these
- B Wing shape
- C Curved profile
- D Aerofoil profile
Explanation:
Question 591: If a lift is going up with acceleration, the apparent weight of a body is:
- A More than the true weight
- B Equal to the true weight
- C Less than the true weight
- D More or less the true weight
Explanation:
Question 592: Which one of following postulate is in accordance with the Rutherfords model ?
- A discrete spectra for atoms
- B either continuous nor discrete
- C no spectrum
- D continuous spectra for atoms
Explanation:
Question 593: Excited atoms return to their ground state in_______________?
- A 10-8s
- B 10-10s
- C 10-9s
- D 10-6s
Explanation:
Question 594: A cyclist cycling around a circular racing track skids because_____________?
- A the friction between the tyres of the cycle and road vanishes
- B the centripetal force upon him is less than limiting friction
- C the centripetal force upon him is greater than limiting friction
- D the centripetal force upon him is equal to the limiting friction
Explanation:
Question 595: While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________?
- A a steady voltage cell is used
- B the balance point is close to the middle of the wire
- C a high resistance box is used in one of its gap
- D a most sensitive galvanometer is used
Explanation:
Question 596: The system which can exchange matter as well as energy with its surroundings is called____________?
- A Inert system
- B Closed system
- C Isolated system
- D open system
Explanation:
Question 597: Minimum number of communication satellites required to cover the whole earth is______________?
- A 2
- B 5
- C 4
- D 3
Explanation:
Question 598: The unit of power is _________?
- A Pascal
- B Joule
- C watt
- D Newton
Explanation:
Question 599: Total number of series in hydrogen spectrum is_____________?
- A five
- B four
- C three
- D six
Explanation:
Question 600: Materials that undergo plastic deformation before breaking are called __________________?
- A Brittle
- B Amorphous
- C Polymers
- D Ductile
Explanation: