Physics - Questions and AnswersPage 10
91. | | The time period of a second's pendulum in a satellite is | | (a)2 | | (b)zero | | (c)infinity | | (d)depends on mass of body |
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Answer is: CNA
92. | | A rectifier is an electronic device used to convert | | (a)AC voltage into DC voltage | | (b)DC voltage into AC voltage | | (c)sinusoidal pulse into square pulse | | (d)None of the above |
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Answer is: ANA
93. | | In step-down transformer, the AC output gives the | | (a)current less than the input current | | (b)voltage more than the input voltage | | (c)current equal to the input current | | (d)current more than the input current |
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Answer is: DNA
94. | | When a fluid passes through the constricted part of pipe, its | | (a)velocity and pressure decrease | | (b)velocity and pressure increase | | (c)velocity decreases and pressure increases | | (d)velocity increases and pressure decreases |
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Answer is: DNA
95. | | The pressure in a liquid at a given depth below the surface | | (a)is same all directions | | (b)is always exerted downward | | (c)equals the total weight of liquid above the depth | | (d)depends upon the amount of liquid below the depth |
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Answer is: ANA
96. | | The pressure at the bottom of a liquid tank does not depend on | | (a)density of the liquid | | (b)acceleration due to gravity | | (c)area of the liquid surface | | (d)height of the liquid |
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Answer is: CNA
97. | | The pressure of the earth's atmosphere at sea level is due to the | | (a)heating of the atmosphere by the sun | | (b)fact that most living things constantly breathe air | | (c)evaporation of water from the seas and oceans | | (d)gravitational attraction of the earth for the atmosphere |
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Answer is: DNA
98. | | The rate of leak from a hole in a tank is | | (a)more if situated near the bottom | | (b)more if situated near its top | | (c)independent of its height from the bottom | | (d)more at midway between top and bottom |
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Answer is: ANA
99. | | An inflated balloon rises to a definite height once it starts going up. This balloon cannot rise any further because at that height | | (a)atmosphere pressure reduces to zero | | (b)apparent weight of the balloon reduces to zero | | (c)density of the balloon reduces to zero | | (d)acceleration due to gravity reduces to zero |
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Answer is: BNA
100. | | An ideal liquid flows through a horizontal tube of variable diameter. The pressure is lowest where the | | (a)velocity is lowest | | (b)velocity is highest | | (c)diameter is largest | | (d)None of these |
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Answer is: BNA
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