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Physics 1999 WAEC Past Questions

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16
The temperature of a piece of metal of mass 9 g is raised from 10oC to 110oC when it absorbs 108J of heat energy. Determine the specific heat capacity of the metal in J kg-1K-1
  • A. 1.2
  • B. 12.0
  • C. 120.0
  • D. 1200.0
View Answer & Discuss (7) WAEC 1999
17
Which of the following statements is not correct?
  • A. A sea breeze is due to convection in air
  • B. Cotton materials are better than woollen ones for use in hot weather
  • C. Convectional currents play an important role in the cooling of the engine of a motor car
  • D. The vacuum space in a flask helps to reduce heat loss by radiation.
View Answer & Discuss (5) WAEC 1999
18
Calculate the heat energy required to change 0.1kg of ice at 0oC to water boiling at 100oC. (Specific heat capacity of water = 4200 J kg-1K-1) (Specific latent heat of fusion of ice = 336,000 J kg-1)
  • A. 75,600J
  • B. 336,000J
  • C. 340,200J
  • D. 378,000J.
View Answer & Discuss (6) WAEC 1999
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19
Which of the following statements about evaporation is not correct?
  • A. The rate of evaporation of a liquid varies with temperature
  • B. The molecules of an evaporating liquid have an average speed
  • C. Evaporation occurs when faster molecules escape from the surface of a liquid
  • D. Evaporation takes place inside a liquid.
View Answer & Discuss (1) WAEC 1999
20
Calculate the power rating of an immersion heater used for 10 minutes to increase the temperature of 10kg of water by 15K. (Specific heat capacity of water = 4200 J l-1K-1)
  • A. 1,050W
  • B. 16,800W
  • C. 18,060W
  • D. 20,160W
View Answer & Discuss (4) WAEC 1999
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