Heat

26 Grade 4 Integrated Science questions on Heat, with worked marking schemes. 26 questions are available on this topic in full.

1. Question 1

   1 mark

   Which of the following materials is a good heat insulator?

   A. Wood

   B. Copper

   C. Iron

   D. Aluminium

   (1 mark)

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2. Question 2

   1 mark

   Which is the safest way to hold a hot cooking pot?

   A. Hold it with bare hands

   B. Use a wet cloth

   C. Use a dry cloth or pot holder

   D. Carry it with your fingertips

   (1 mark)

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3. Question 3

   1 mark

   We wear warm clothes in cold weather to

   A. attract more heat from the air

   B. prevent heat from leaving our bodies

   C. look fashionable

   D. make ourselves heavier

   (1 mark)

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4. Question 4

   1 mark

   A metal spoon in hot tea becomes hot because metal is a good

   A. conductor of heat

   B. reflector of heat

   C. source of heat

   D. insulator of heat

   (1 mark)

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5. Question 5

   1 mark

   Materials that do not conduct heat easily are called

   A. conductors

   B. reflectors

   C. insulators

   D. magnets

   (1 mark)

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6. Question 6

   1 mark

   Which of the following produces heat by using electricity?

   A. A book

   B. A bicycle

   C. A window

   D. An electric iron

   (1 mark)

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7. Question 7

   1 mark

   Which of the following is the main natural source of heat for the earth?

   A. A torch

   B. The moon

   C. The sun

   D. A stone

   (1 mark)

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8. Question 8

   1 mark

   When water is heated for a long time on a jiko, it slowly

   A. Becomes solid

   B. Turns into ice

   C. Turns into steam

   D. Turns into oil

   (1 mark)

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9. Question 9

   3 marks

   State three safety measures to observe when using fire or heat at home.

   (3 marks)

   Marking scheme

   Any three (1 mark each): keep a safe distance from the fire; do not touch hot objects with bare hands; put out the fire after use; keep small children away from fire; do not play near a jiko or stove; use a pot holder or dry cloth.

10. Question 10

    1 mark

    Which safety rule should be followed when you are near an open fire?

    A. Pour paraffin on the fire

    B. Touch the flames to test them

    C. Play very close to the flames

    D. Keep a safe distance from the fire

    (1 mark)

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11. Question 11

    3 marks

    (a) Give two uses of heat at home.

    (b) State one danger of heat.

    (3 marks)

    Marking scheme

    (a) Any two (1 mark each): cooking food; warming the house/body; drying clothes; ironing; boiling water. (b) Any one (1 mark): it can burn the skin; it can cause fires.

12. Question 12

    1 mark

    Heat is a form of

    A. liquid

    B. solid

    C. matter

    D. energy

    (1 mark)

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13. Question 13

    1 mark

    Which of the following is a use of heat in the home?

    A. Cutting paper

    B. Cooling water in a fridge

    C. Ironing clothes

    D. Sweeping the floor

    (1 mark)

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14. Question 14

    4 marks

    Heat can change materials. Give two examples showing how heat changes a material at home.

    (4 marks)

    Marking scheme

    Any two examples explained (2 marks each): heating candle wax makes it melt into liquid; boiling water turns it into steam/vapour; cooking changes raw food into cooked food; heating maize makes popcorn.

15. Question 15

    1 mark

    Mama Njeri lights a jiko of charcoal to cook githeri. In this case the heat comes from

    A. Burning charcoal

    B. The moon

    C. The sun

    D. The wind

    (1 mark)

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16. Question 16

    1 mark

    Heat travels from

    A. a cold object to a hot object

    B. cold air to cold water

    C. a hot object to a cold object

    D. objects of the same temperature

    (1 mark)

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17. Question 17

    3 marks

    State three sources of heat used in a Kenyan home.

    (3 marks)

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18. Question 18

    1 mark

    The instrument used to measure temperature is a

    A. ruler

    B. thermometer

    C. clock

    D. scale

    (1 mark)

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19. Question 19

    1 mark

    When you rub your two palms together quickly, they become warm. The heat is produced by

    A. Friction

    B. The sun

    C. Electricity

    D. Burning

    (1 mark)

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20. Question 20

    1 mark

    What happens to a piece of butter when it is heated?

    A. It freezes

    B. It stays exactly the same

    C. It becomes harder

    D. It melts

    (1 mark)

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21. Question 21

    1 mark

    Which of the following is a source of heat?

    A. Fire

    B. Ice

    C. Shadow

    D. Cold water

    (1 mark)

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22. Question 22

    3 marks

    (a) Name the natural source of heat and light for the earth.

    (b) Give two uses of heat from the sun.

    (3 marks)

    Marking scheme

    (a) The sun (1 mark). (b) Any two (1 mark each): drying clothes; drying crops/grains; warming the body/houses; drying salt or fish.

23. Question 23

    3 marks

    Kamau saw his mother lift a hot sufuria off the fire using a dry cloth.

    (a) Why did she use a dry cloth and not a wet one?

    (b) State one other safety rule to follow when handling heat.

    (3 marks)

    Marking scheme

    (a) A dry cloth does not let heat pass through easily, but a wet cloth lets heat/steam pass and can scald or burn the hands (2 marks). (b) Any one (1 mark): keep a safe distance from fire; do not touch hot objects; keep young children away from fire.

24. Question 24

    1 mark

    Wet clothes hung outside on a sunny day dry up because of heat from the

    A. Sun

    B. Wind alone

    C. Moon

    D. Fridge

    (1 mark)

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25. Question 25

    1 mark

    Which of these appliances is used together with heat to cook food?

    A. A jiko

    B. A fan

    C. A radio

    D. A torch

    (1 mark)

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26. Question 26

    4 marks

    Explain what happens to each of the following when it is strongly heated: (a) a cube of ice; (b) a metal spoon.

    (4 marks)

    Marking scheme

    (a) The ice melts and changes into water (2 marks). (b) The metal spoon becomes hot/warm to touch (accept: it expands slightly) (2 marks).

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