Physics Questions and Answers

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Q31
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
  • A mercury is a metal
  • B density of mercury is greater than that of water
  • C cohesion of mercury is greater than its adhesion with glass
  • D cohesion of water is greater than its adhesion with glass
Answer: Option C
Q32
Suitable impurities are added to a semiconductor depending on its use. This is done in order to
  • A increase its life
  • B enable it to withstand higher voltages
  • C increase its electrical conductivity
  • D increase its electrical resistivity
Answer: Option C
Q33
Stars twinkle because
  • A the intensity of light emitted by them changes with time
  • B the distance of the stars from the earth changes with time
  • C the refractive index of the different layers of the earth's atmosphere changes
  • D continuously, consequently the position of the image of a start changes with time
Answer: Option C
Q34
It takes much longer to cook food in the hills than in the plains, because
  • A in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
  • B due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
  • C in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere
  • D in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
Answer: Option A
Q35
 Moment of inertia is
  • A vector
  • B scalar
  • C phasor
  • D tensor
Answer: Option D
Q36
Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?
  • A Rainbow
  • B Earthshine
  • C Halo
  • D Mirage
Answer: Option D
Q37
Inside an aeroplane, flying at a high altitude,
  • A the pressure is the same as that outside
  • B 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
Answer: Option B
Q38
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
  • A Water, iron and air
  • B Iron, air and water
  • C Air, water and iron
  • D Iron, water and air
Answer: Option C
Q39
One thousand microns is equal to
  • A 10-3m
  • B 10-6m
  • C 10-9m
  • D 10-12m
Answer: Option A
Q40
 Sound travels at the fastest speed in
  • A steel
  • B water
  • C air
  • D vacuum
Answer: Option A

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