Revision Exercise

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Revision Exercise

• Chapter 2

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• Which of the following statements about the
  conduction of heat is wrong?
• Metals are generally better conductors than
  woods.
• Lighter objects are generally better conductors
  than heavier objects.
• Air is a poor conductor.
• Convection is generally less important than
  conduction in transferring heat in solids.

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• People wearing down (??) coat usually feels
  warmer than putting on ordinary clothes of
  similar thickness. Which of the following best
  explains this?
• Eiderdown is usually lighter than the materials
  making the ordinary clothes, it absorbs less
  energy from our body.
• Eiderdown traps air, which is a poor conductor of
  heat.
• Eiderdown coat absorbs more heat from
  surroundings than ordinary clothes to make our
  body warm.
• The specific heat capacity of eiderdown coat is
  less than that of ordinary clothes.

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• Which of the following phenomena CANNOT be
  explained by conduction of heat?
• The furs and feathers of some wild animals are
  thickest in winter.
• The handles of saucepan are usually made of
  insulators of heat.
• The heating parts of the cooking utensils are
  made of metals.
• The heat exchanger at the back of refrigerator is
  painted black.

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• At the back of a television, slots and holes can
  be found on the case. Which of the following best
  describes their function.
• To save material making the case and hence to
  reduce the cost of production.
• For better reception of television signal.
• For better appearance.
• Allow ventilation for convection of air, by which
  energy is carried away from the inner components
  of the television.

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• Which of the following descriptions about
  convection is/are correct?
• Convection transfers energy in a fluid by the
  movement of the fluid.
• In heating the same volumes of congee (?) and
  water in 2 identical pans with the same fire,
  convection current appears earlier in the pan of
  water.
• Convection cannot occur on the surface of the
  Moon, which has no atmosphere.
• (1) and (2) only.
• (1) and (3) only.
• (2) and (3) only.
• (1), (2) and (3).

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• Which of the following actions CANNOT increase
  the rate of heat loss by radiation of a hot
  object?
• Increase its temperature.
• Increase its surface area.
• Paint its surface silvery.
• Paint its surface dull black.

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• Which of the following actions can speed up the
  cooling of a glass of hot water at room
  temperature?
• Paint the glass dull black.
• Put a stainless steel spoon into the glass.
• Put the glass in somewhere windy.
• (1) and (2) only.
• (1) and (3) only.
• (2) and (3) only.
• (1), (2) and (3).

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• Which state of matter is the poorest conductor
  of heat?
• Solid
• Liquid
• Gas
• No difference

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• Convection causes
• sea-land breezes.
• tsunamis(??).
• a drop of ink to spread out in still water.
• lava(??)to flow downhill.

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