Physics MCQs with answers Page - 9

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Q. ntensity of sound at a point is ____ its distance from the source.

  • (A) directly proportional to
  • (B) inversely proportional to
  • (C) directly proportional to square of
  • (D) inversely proportional to square of

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Q. Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

  • (A) at sea level
  • (B) at the top of Mt. Everest
  • (C) at a place in a valley below sea level
  • (D) in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level

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Q. Radio telescopes are better than optical telescopes because

  • (A) they can detect faint galaxies which no optical telescope can
  • (B) they can work even in cloudy conditions
  • (C) they can work during the day and night
  • (D) All of the above

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Q. Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit

  • (A) X-rays
  • (B) ultraviolet light
  • (C) visible light
  • (D) radio waves

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Q. Mercury is commonly used as a thermometric fluid rather than water because

  • (A) specific heat of mercury is less than water
  • (B) specific heat of mercury is more than water
  • (C) mercury has greater visibility than water
  • (D) density of mercury is more than the water

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Q. Optical fibre works on the

  • (A) principle of refraction
  • (B) total internal reflection
  • (C) scattering
  • (D) interference

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Q. Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

  • (A) 4.2 seconds
  • (B) 42 seconds
  • (C) 4.2 years
  • (D) 42 years

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Q. Supersonic plane fly with the speed

  • (A) less than the speed of sound
  • (B) of sound
  • (C) greater than the speed of sound
  • (D) of light

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Q. Mach number is used in connection with the speed of

  • (A) sound
  • (B) aircraft
  • (C) spacecraft
  • (D) ships

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Q. Rainbow is due to

  • (A) absorption of sunlight in minute water droplets
  • (B) diffusion of sunlight through water droplets
  • (C) ionisation of water deposits
  • (D) refraction and reflection of sunlight by water droplets

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