# UPSC  Physics

61. A person sitting in a bus experiences a jerk, when the bus stops all of a sudden. This is due to

 Law of inertia Newton’s third law of motion Einstein’s law of relativity None of these

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62. Study the frequency of the following electromagnetic radiations and select the correct relationship (‘>’ implies greater than):
I.: Infrared
II.: Microwave
III.: Ultraviolet

 I > II > III III > I > II III > II > I II > III > I

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63. Which of the following laws was passed during the second half of the nineteenth century under the Social and Religious Reform Movement?

 Formation of Theosophical Society Sanction of inter caste and inter communal marriages Opening of Aligarh Muslim University’ None of the above

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64. If the distance that a radio wave can travel in the time of one complete cycle is 10 metres, then the frequency of the radio wave in cycles per second is

 3×108 m/sec 3×106 m/sec 3×109 m/sec 3×107 m/sec

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65. A truck, a car and a motor cycle have equal kinetic energies. If equal stopping

 x > y > z x < y < z x = y = z x 4y 8z

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66. Assertion (A): Transformer is useful for stepping up or stepping down voltages.
Reason (R): Transformer is a device used in D.C. circuits. In the context of the above two statements, which one of the following is correct?

 Both A and R are true and R is the correct explanation of A. Both A and R are true but R is not a correct explanation of A. A is true but R is false. A is false but R is true.

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67. Consider the following statements:
At the present level of technology available in India, solar energy can be conveniently used to
I. supply hot water to residential buildings.
II. supply water for minor irrigation projects.
III. provide street lighting.
IV. electrify a cluster of villages and small towns.
Of these statements

 I, II, III and IV are correct. II and IV are correct I and III are correct I, II and III are correct

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68. Consider the following statements:
A person in a spaceship located half way between the earth and the sun will notice that the
I. Sky is jet black.
II. Stars do not twinkle.
III. Temperature outside the spaceship is much higher than that on the surface of the earth.
Of these statements

 Only III is correct I and II are correct I and III are correct I, II and III are correct

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69. An astronaut weighing 100 kg fires a bullet weighing 1 kg with a gun of 10 kg at the speed of 50 metres/second. What will be the recoil velocity of the gun?

 5 cm/s 50 cm/s 0.5 cm/s 0.05 cm/s

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70. Match:

List IList II
Measuring instruments   Which measure
A. anemometer1. Motor power
B. Tachometer2. Wind speed
C. Dynamometer3. revolutions per minute
D. Barometer4. Atmospheric pressure
5.Current from a dynamo
A B C D

 1 3 5 4 2 1 3 4 2 3 1 4 1 3 5 2

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