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396
An iron rod of length 50m and at a temperature of 60oC is heated to 70oC. Calculate its new length. (Linear expansivity of iron = 1.2 x 10-5K-1)
  • A. 50.006m
  • B. 50.060m
  • C. 51.600m
  • D. 51.200m
View Answer & Discuss (2) WAEC 1999
397
The heat capacity of a substance is the energy
  • A. required to raise the temperature of a unit mass of the substance by one degree.
  • B. required to raise the temperature of the substance by one degree
  • C. absorbed by the substance at constant temperature
  • D. lost by a unit mass of the substance.
View Answer & Discuss (1) WAEC 1999
398
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
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399
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
400
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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