Physics - Questions and AnswersPage 9
81. | | Moon has no atmosphere | | (a)does not have sufficient gravity to hold atmosphere | | (b)does not have oxygen | | (c)because mass is less than earth | | (d)None of the above |
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Answer is: ANA
82. | | If the radius of the earth's orbit becomes one-fourth of the present value, the deviation of one year will become | | (a)8 times | | (b)1/8 times | | (c)4 times | | (d)1/4 times |
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Answer is: BNA
83. | | The value of acceleration due to gravity on the surface of the earth is g. If the diameter of the earth becomes double of its present value and its mass remains unchanged, the value of acceleration due to gravity on the surface of the earth would become | | (a)g/2 | | (b)g/4 | | (c)4/g | | (d)2/g |
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Answer is: CNA
84. | | For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is | | (a)1/√2 | | (b)1/2 | | (c)√2 | | (d)2 |
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Answer is: BNA
85. | | A simple pendulum is oscillating in a lift. If the lift starts moving upwards with a uniform acceleration, the period will | | (a)be longer | | (b)remain unaffected | | (c)be shorter | | (d)none of the above |
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Answer is: CNA
86. | | A simple harmonic oscillator has time period T. the time taken by it to travel from the extreme position to half the amplitude is | | (a)T/6 | | (b)T/3 | | (c)T/4 | | (d)T/2 |
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Answer is: CNA
87. | | A simple pendulum is vibrating in an evacuated chamber. It will | | (a)come to rest eventually | | (b)oscillate with the same amplitude but frequency will decrease with time | | (c)oscillate with same frequency but amplitude will decrease with time | | (d)oscillate for ever with the same amplitude and frequency |
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Answer is: DNA
88. | | A simple pendulum has a time period T1 when on the earth's surface and T2 when taken to height R above the earth's surface, where R is the radius of the earth. The value of T1/ T2 | | (a)1/2 | | (b)4 | | (c)3 | | (d)2 |
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Answer is: ANA
89. | | If a pendulum clock is brought inside an artificial satellite, then the time period of the clock becomes | | (a)0 | | (b)∞ | | (c)1 | | (d)None of these |
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Answer is: BNA
90. | | If a pendulum clock is brought on the moon, then the period of oscillation of the pendulum clock becomes | | (a)decreased | | (b)increased | | (c)zero | | (d)infinite |
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Answer is: BNA
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