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991
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
992
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
993
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
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994
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
995

A ray of light is incident on 'a plane mirror at an angle of 20o. This mirror is rotated through, twice this angle, In this new position the angle between the incident ray and the reflected ray is

  • A. 20o
  • B. 40o
  • C. 80o
  • D. 120o.
View Answer & Discuss (9) WAEC 1999
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