Physics MCQs with answers Page - 7

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Q. The lens used in a simple microscope is

  • (A) Concave
  • (B) Convex
  • (C) Cylindrical
  • (D) None

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Q. The S. I. unit of refractive index is

  • (A) meter
  • (B) cm
  • (C) watt
  • (D) no unit

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Q. The liquid metal is

  • (A) Bismuth
  • (B) Magnesium
  • (C) Mercury
  • (D) Sodium

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Q. Endothermic reactions are those in which

  • (A) Heat is evolved
  • (B) Heat is absorbed
  • (C) Temperature increases
  • (D) Light is produced

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Q. Which colour of light is deviated least

  • (A) Red
  • (B) Blue
  • (C) Violet
  • (D) Green

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Q. Sound of frequency below 20 Hz is called

  • (A) audio sounds
  • (B) infrasonic
  • (C) ultrasonic
  • (D) supersonics

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Q. 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.

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Q. 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

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Q. 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

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Q. Moment of inertia is:

  • (A) Vector
  • (B) Scalar
  • (C) Phasor
  • (D) Tensor

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