Physics - Heat

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Question - 1

The temperature of boiling water in steam engine may be high because

  • A there are dissolved substances in water
  • B there is low pressure inside the boiler
  • C there is high pressure inside the boiler
  • D the fire is at very high temperature

Question - 2

The energy that can harness heat stored below the earth's surface is known as

  • A thermal energy
  • B tidal energy
  • C nuclear energy
  • D geothermal energy

Question - 3

The wavelength of the radiation emitted by a body depends upon

  • A the temperature of the surface
  • B the area of the surface
  • C the nature of the surface
  • D All of the above factors

Question - 4

At upper atmosphere, an astronaut feels

  • A extremely hot
  • B slightly hotter
  • C extremely cool
  • D slightly cooler

Question - 5

The celsius temperature is a/an

  • A relative temperature
  • B absolute temperature
  • C specific temperature
  • D approximate temperature

Question - 6

Which of the following is the best conductor of the heat?

  • A Mercury
  • B Silver
  • C Leather
  • D Benzene

Question - 7

What is the principle by which a cooling system (Radiator) in a motor car works?

  • A Convection
  • B Conduction only
  • C Radiations only
  • D Both conduction and radiation

Question - 8

The cloud float in the atmosphere because of their low

  • A velocity
  • B temperature
  • C density
  • D pressure

Question - 9

White clothes are cooler than black ones because they

  • A absorb all the light that reaches them
  • B reflect all the light that reaches them
  • C will not allow the light to penetrate
  • D cool the sun light completely

Question - 10

The change of a solid into vapour directly is called

  • A vapourization
  • B freezing
  • C melting
  • D sublimation