Practice test

Heat, temperature and thermodynamics - Test Set 2

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

    When water freezes its density.
    1. Decreases
    2. Becomes zero
    3. Remains constant
    4. Increases
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  2. Question 2

    Super cooling stands for cooling of a liquid
    1. At freezing point
    2. At melting point
    3. Below freezing point
    4. Above melting point
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  3. Question 3

    Refrigerator protects the food from contamination because
    1. At its low temperature bacteria & fungus become non-reactive.
    2. Germs get died at this temperature.
    3. Germs get freeze at this temperature.
    4. It makes food free from germs.
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  4. Question 4

    Cryogenic science is related to
    1. High temperature
    2. Low temperature
    3. Friction and wear-tear
    4. Increment in crystals.
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  5. Question 5

    What determines the colour of a star?
    1. Temperature
    2. Distance
    3. Radius
    4. Atmospheric Pressure
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  6. Question 6

    The rate of cooling depends on which factor?
    1. Temperature difference between body and its surroundings
    2. Nature of radiated surface
    3. Area of radiated surface
    4. All of the above
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  7. Question 7

    A copper disc has a hole. If the disc is heated the size of hole
    1. Increases
    2. Decreases
    3. No change
    4. First increase then decreases
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  8. Question 8

    During hot weather the fan produces a feeling of comfort this is because
    1. Fan supplies cool air
    2. Fan cools the air
    3. Our perspiration evaporates rapidly
    4. Conductivity of air increases
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  9. Question 9

    Ocean currents are an example of
    1. Convection
    2. Conduction
    3. Insulation
    4. Radiation
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  10. Question 10

    A circular plate, a cube and a sphere all made up of same material and having the same mass are heated to 300°C and left in a room which of them will have slowest rate of cooling?
    1. Circular plate
    2. Cube
    3. Sphere
    4. All will cool at the same rate
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  11. Question 11

    Conversion of heat energy into electric energy is achieved by using
    1. Ammeter
    2. Hydrometer
    3. Voltmeter
    4. Thermocouple
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  12. Question 12

    On heating frozen foods in sealed pouches in a microwave why do you first poke holes in the pouch?
    1. To prevent steam pressure from bursting open the pouch.
    2. To allow the heat get into the food through the hole.
    3. To allow the microwaves to get into the food through the holes.
    4. To allow the aroma of the food to come out through the hole.
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  13. Question 13

    In case of an ideal gas, Joule-Thomson effect is
    1. zero
    2. positive
    3. negative
    4. infinite
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  14. Question 14

    The temperature at which Celsius and Fahrenheit scales give the same reading is:
    1. 0°C
    2. 32°C
    3. -40°C
    4. 40°C
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  15. Question 15

    Kinetic energy of molecules is highest in
    1. Gases
    2. Solids
    3. Liquids
    4. Solutions
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  16. Question 16

    If temperature is kept constant during a reaction, the process is called
    1. Adiabatic
    2. Isobaric
    3. Isochoric
    4. Isothermal
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  17. Question 17

    The principle underlying a microwave oven is
    1. Heat generated by nuclear power
    2. Microwaves are similar to thermal radiation
    3. Not fully understood
    4. Microwaves vibrate the water molecules in food thereby generating heat
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  18. Question 18

    Select the best response:
    One should wear coloured dress in winter because
    1. They look colourful
    2. They are cheaper
    3. They absorb heat
    4. it is easy to wash them
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  19. Question 19

    Which of the following metals is the best conductor of heat and electricity?
    1. Sodium
    2. Copper
    3. Silver
    4. Potassium
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  20. Question 20

    When water cools from 7°C to 0°C
    1. It contracts only
    2. It expands only
    3. It first contracts and then expands
    4. It first expands and then contracts
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