Physics - Questions (Section-1)
37Inside an aeroplane, flying at a high altitude,
A. the pressure is the same as that outsideB. normal atmospheric pressure is maintained by the use of air pumps
C. the pressure inside is less than the pressure outside D. normal humidity and partial vacuum are maintained
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38oil raise up the wick in a lamp. The principle involves
A. the diffusion of oil through the wickB. the liquid state of oil
C. capillary action phenomenon D. volatility of oil
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39One thousand microns is equal to
A. 10-3mB. 10-6m
C. 10-9m D. 10-12m
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40Sound travels at the fastest speed in
A. steelB. water
C. air D. vacuum
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41Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
A. Water, iron and airB. Iron, air and water
C. Air, water and iron D. Iron, water and air
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42Superconductors are substances which
A. conduct electricity at low temperatureB. offer high resistance to the flow of current
C. offer no resistance to the flow of electricity D. conduct electricity at high temperatures
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