Practice test

Heat, temperature and thermodynamics - Test Set 4

Review 20 exam-focused questions with detailed explanations, then start the interactive test when you are ready.

20 questions

Questions and explanations

  1. Question 1

    Transfer of heat by convection can take place in
    1. solid and liquids
    2. solid and vacuum
    3. gases and liquids
    4. vacuum and gases
    View explanation

    Sign In to See Explanations. Sign Up Here

  2. Question 2

    The coefficient of thermal conductivity depends upon
    1. temperature difference of two surfaces
    2. area of the plate
    3. thickness of the plate
    4. material of the plate
    View explanation

    Sign In to See Explanations. Sign Up Here

  3. Question 3

    Transfer of heat energy from a heater coil to the food in cooking vessel takes place through the process of
    1. convection only
    2. conduction and convection only
    3. radiation and convection only
    4. convection conduction and radiation
    View explanation

    Sign In to See Explanations. Sign Up Here

  4. Question 4

    When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will
    1. remain same
    2. double
    3. three times
    4. four times
    View explanation

    Sign In to See Explanations. Sign Up Here

  5. Question 5

    A wooden spoon is dipped in a cup of ice-cream. Its other end will ______.
    1. become cold by the process of conduction
    2. become cold by the process of convection
    3. become cold by the process of radiation
    4. not become cold
    View explanation

    Sign In to See Explanations. Sign Up Here

  6. Question 6

    Ice is packed in saw dust because
    1. saw dust will not get melted easily
    2. saw dust is poor conductor of heat
    3. saw dust is a good conductor of heat
    4. saw dust does not stick to the ice
    View explanation

    Sign In to See Explanations. Sign Up Here

  7. Question 7

    A liquid remains hot or cold for a long time in thermos flask because there is no loss or gain of heat by
    1. conduction
    2. convection and radiation
    3. Both (a) and (b)
    4. None of the above
    View explanation

    Sign In to See Explanations. Sign Up Here

  8. Question 8

    In which of the following phenomena do heat waves travel along a straight line with the speed of light?
    1. Thermal conduction
    2. Thermal convention
    3. Thermal radiation
    4. Both (a) and (c)
    View explanation

    Sign In to See Explanations. Sign Up Here

  9. Question 9

    In which of the following, heat loss is primarily not due to convection?
    1. Boiling water
    2. Land and sea breeze
    3. Circulation of air around blast furnace
    4. Heating of glass surface of a bulb due to current in filament
    View explanation

    Sign In to See Explanations. Sign Up Here

  10. Question 10

    Why are dewdrops not formed on a cloudy night?
    1. Clouds absorb the radiation released from the Earth’s surface.
    2. Clouds reflect back the Earth’s radiation.
    3. The Earth’s surface would have low temperature on cloudy nights.
    4. Clouds deflect the blowing wind to ground level.
    View explanation

    Sign In to See Explanations. Sign Up Here

  11. Question 11

    In a closed room, heat transfer takes place by
    1. Conduction
    2. convection
    3. radiation
    4. All of these
    View explanation

    Sign In to See Explanations. Sign Up Here

  12. Question 12

    Which one of the following processes is not a part of long-wave radiation?
    1. Conduction
    2. Scattering
    3. Convection
    4. Radiation
    View explanation

    Sign In to See Explanations. Sign Up Here

  13. Question 13

    Radiations coming from the sun are mostly in the form of
    1. light only
    2. light and long wavelength infrared
    3. light and short wavelength infrared
    4. Both short and long wavelength infrared
    View explanation

    Sign In to See Explanations. Sign Up Here

  14. Question 14

    Supercooling is cooling of liquid ____________ .
    1. below melting point
    2. below freezing point
    3. at melting point
    4. above melting point
    View explanation

    Sign In to See Explanations. Sign Up Here

  15. Question 15

    The brightness of a star depends on its
    1. size and temperature
    2. size and distance from the earth
    3. size, temperature and mass
    4. size, temperature and distance from the earth
    View explanation

    Sign In to See Explanations. Sign Up Here

  16. Question 16

    A hot body cools from 90°C to 75°C in 25 s. The same body in further cooling 75°C to 60°C will take how much time?
    1. 25 s
    2. Less than 25 s
    3. More than 25 s
    4. Nothing can be said
    View explanation

    Sign In to See Explanations. Sign Up Here

  17. Question 17

    The first law of thermodynamics is related to conservation of which one of the following?
    1. Energy
    2. Number of molecules
    3. Number of moles
    4. Temperature
    View explanation

    Sign In to See Explanations. Sign Up Here

  18. Question 18

    The statement that ‘heat cannot flow by itself from a body at a lower temperature to a body at a higher temperature’, is known as
    1. zeroth law of thermodynamics
    2. first law of thermodynamics
    3. second law of thermodynamics
    4. third law of thermodynamics
    View explanation

    Sign In to See Explanations. Sign Up Here

  19. Question 19

    Which one of the following physical quantities is the same for molecules of all gases at a given temperature?
    1. Speed
    2. Mass
    3. Kinetic energy
    4. Momentum
    View explanation

    Sign In to See Explanations. Sign Up Here

  20. Question 20

    The direction of heat flow between two bodies depends on which of the following?
    1. Their specific heat
    2. Their latent heat
    3. Their area of contact
    4. Their temperatures
    View explanation

    Sign In to See Explanations. Sign Up Here