1.
Which of these sentences is true?
- A. In a gas the particles have strong forces between them
- B. Liquids fill completely the container they are in
- C. The forces are strong between particles in a solid
- D. Particles in a liquid move faster than in a gas
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| Which of these descriptions matches which state of matter? |
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| 2. Particles are widely separated. |
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| 3. Has no fixed shape. |
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| 4. Strong bonds hold the particles firmly in place. |
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Heat can travel through substances either through conduction, convection, radiation or evaporation.
Which of these methods... |
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| 5. works best in solids |
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| 6. works fastest in liquids with a large surface area exposed to the air |
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| 7. can pass through a vacuum |
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| 8. works by hot regions expanding and rising in liquids and gases |
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| 9. works extremely well in metals because of free conduction electrons |
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10. Heat radiation is which type of radiation?
- A. Infrared
- B. Ultraviolet
- C. Gamma
- D. Microwave
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11. Which colour is the worst emitter and absorber of heat radiation?
- A. White
- B. Silver
- C. Black
- D. Red
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12. A radiator is made to emit heat radiation. To emit the most radiation it should be
- A. warm and white
- B. warm and black
- C. hot and white
- D. hot and black
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13. A cup of soup is left to cool in a room. Which of these factors would not affect the rate of cooling?
- A. The surface area of the soup
- B. The temperature of the room
- C. The Material the soup mug
- D. The size of the room
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14. Some elephants in hot countries have large ears. This adaptation helps because
- A. It prevents evaporation from sweat
- B. The large surface area of the ear loses heat rapidly, keeping them cool
- C. The large surface area prevents heat radiation escaping
- D. The large surface area absorbs the heat from the sun rapidly
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15. Sweating keeps mammals cool. Which of these explanations is correct?
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Method of heat loss |
Explanation |
| A |
Convection |
Hot liquid rises to top of sweat droplet |
| B |
Convection |
Heat escapes from mammal with the liquid |
| C |
Evaporation |
Hot particles escape and cold ones are left behind |
| D |
Evaporation |
Evaporating sweat leaves skin dry and exposed |
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