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Physics WAEC Past Questions

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
66
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
67
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
68
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
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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69

A block of ice at its melting point is left on a table in the atmosphere and observed to melt gradually. Which of the following statements is true about the melting process?

  • A. the reaction force of the table on the ice breaks the ice into water molecules
  • B. heat extracted from the ice block makes the ice block cold
  • C. the ice block absorbs heat from the atmosphere and its temperature rises
  • D. the atmosphere absorbs heat from the ice block and its temperature falls
  • E. the ice block absorbs heat from the atmosphere and its temperature remains constant as it melts
View Answer & Discuss (7) WAEC 1989
70

All the heat generated by a current of 2A passing through a resistor of 6Ω for 25s is used to evaporate 5 g of a liquid at its boiling point. What is the specific latent heat of the liquid?

  • A. 60 Jg-1
  • B. 120 Jg-1
  • C. 300 Jg-1
  • D. 360 Jg-1
  • E. 1500 Jg-1
View Answer & Discuss (11) WAEC 1989
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