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PHYSICS MCQs

Total Questions : 3767 | Page 5 of 377 pages
Question 41. Sound travels at the fastest speed in
  1.    steel
  2.    water
  3.    air
  4.    vacuum
 Discuss Question
Answer: Option A. -> steel
Question 42. Superconductors are substances which
  1.    conduct electricity at low temperature
  2.    offer high resistance to the flow of current
  3.    offer no resistance to the flow of electricity
  4.    conduct electricity at high temperatures
 Discuss Question
Answer: Option C. -> offer no resistance to the flow of electricity
Question 43. Oil raise up the wick in a lamp. The principle involves
  1.    the diffusion of oil through the wick
  2.    the liquid state of oil
  3.    capillary action phenomenon
  4.    volatility of oil
 Discuss Question
Answer: Option C. -> capillary action phenomenon
Question 44. Light travels at the fastest speed in:
  1.    glass
  2.    water
  3.    hydrogen
  4.    vacuum
 Discuss Question
Answer: Option D. -> vacuum
Question 45. Railway tracks are banked on curves
  1.    necessary centrifugal force may be obtained from the horizontal component weight of the train
  2.    to avoid frictional force between the tracks and wheels
  3.    necessary centripetal force may be obtained from the horizontal component of the weight of the train
  4.    the train may not fly off in the opposite direction
 Discuss Question
Answer: Option C. -> necessary centripetal force may be obtained from the horizontal component of the weight of the train
Question 46. On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because
  1.    metals have higher thermal capacity than plastics
  2.    plastics have a lower density than metals
  3.    metals are good conductor of heat
  4.    plastics have a higher thermal conductivity than metals
 Discuss Question
Answer: Option C. -> metals are good conductor of heat
Question 47. Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
  1.    1.8 km, 0.15 km
  2.    2.2 km, 0.20 km
  3.    2.8 km, 0.25 km
  4.    3.3 km, 0.30 km
 Discuss Question
Answer: Option D. -> 3.3 km, 0.30 km
Question 48. Intensity of sound at a point is ____ its distance from the source.
  1.    directly proportional to
  2.    inversely proportional to
  3.    directly proportional to square of
  4.    inversely proportional to square of
 Discuss Question
Answer: Option D. -> inversely proportional to square of
Question 49. Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
  1.    at sea level
  2.    at the top of Mt. Everest
  3.    at a place in a valley below sea level
  4.    in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
 Discuss Question
Answer: Option C. -> at a place in a valley below sea level
Question 50. Radio telescopes are better than optical telescopes because
  1.    they can detect faint galaxies which no optical telescope can
  2.    they can work even in cloudy conditions
  3.    they can work during the day and night
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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