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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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656
Which of the following surfaces will radiate heat energy best?
  • A. Red
  • B. White
  • C. Black
  • D. Yellow
  • E. Blue
View Answer & Discuss (10) WAEC 1989
657

Which of the following statements is/are not correct?

  • A. Evaporation takes place only at the surface of the liquid
  • B. Boiling takes place throughout the volume of the liquid
  • C. Evaportaion takes place at all temperatures
  • D. Boiling takes place at a particular temperature for a liquid at a fixed external pressure
  • E. The boiling point of a liquid is not affected by impurities
View Answer & Discuss (5) WAEC 1989
658
Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain the
  • A. relative humidity is higher than at sea-level
  • B. rays of the sun adds more heat to the water
  • C. temperature is lower than that at sea-level
  • D. pressure is lower than that at sea-level
  • E. pressure is more than that at sea-level
View Answer & Discuss (4) WAEC 1989
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659
Which of the following substance is not a good conductor of electricity?
  • A. Human body
  • B. Glass
  • C. Aluminium
  • D. Earth
  • E. Copper
View Answer & Discuss WAEC 1989
660
Calculate the heat energy required to vapourize 50g of water initially at 80oC if the specific heat capacity of water is 4.2Jg-1K (specific latent heat of vapourization of water is 2260Jg-1).
  • A. 533000J
  • B. 230000J
  • C. 117200J
  • D. 113000J
  • E. 4200J
View Answer & Discuss (2) WAEC 1989
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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