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Physics 1998 WAEC Past Questions

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21

A waterfall is 1260m high. Calculate the change in temperature of a quantity of water that falls from the top to the bottom of the waterfall. (Neglect heat losses to the surroundings, take g as 10m-2 and specific heat capacity of water as 4200Jkg-1K-1)

  • A. 0.3oC
  • B. 3.0oC
  • C. 33.3oC
  • D. 42.0oC
  • E. 100.0oC
View Answer & Discuss (7) WAEC 1998
22
A piece of metal is heated until it becomes red-hot, it is then quickly transferred into a beaker containing boiling water. What effect will this have on the boiling water?
  • A. the boiling water rises slightly
  • B. the boiling point rises sharply
  • C. the rate of vaporisation of the boiling water increases
  • D. the boiling point first rises and then falls
  • E. neither the boiling point nor the rate of vaporisation increases
View Answer & Discuss (1) WAEC 1998
23

A 90-W immersion heater is used to supply energy for five minutes. The energy supplied is used to completely melt 180g of a solid at is melting point. Neglecting energy losses to the surroundings, calculate the specific latent heat of fusion of the solid

  • A. 0.5Jg-1
  • B. 2.5Jg-1
  • C. 15.0Jg-1
  • D. 450.0Jg-1
  • E. 150Jg-1
View Answer & Discuss (16) WAEC 1998
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24
If an ebonite rod is rubbed with fur
  • A. both the ebonite rod and the fur will be negatively charged
  • B. the ebonite rod will be positively charged while the fur will have no charge
  • C. there will be electron transfer only if the ebonite rod is earthed
  • D. the ebonite rod will be negatively charged while the fur will be positively charged
  • E. the ebonite rod will be positively charged while the fur will be negatively charged
View Answer & Discuss (2) WAEC 1998
25
An eclipse of the sun by the moon occurs when the sun, the moon and the earth are in a straight line and the
  • A. earth casts a shadow on the moon
  • B. moon casts a shadow on the sun
  • C. moon is between the sun and the earth
  • D. earth is between the sun and the moon
  • E. sun is between the moon and the earth
View Answer & Discuss WAEC 1998
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