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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
2116
Dry oxygen is trapped by a pellet of mercury in a uniform capillary tube which is sealed at one end. The length of the column of oxygen at 27oC is 50cm. if the pressure of the oxygen is constant, at what temperature will the length be 60cm?
  • A. 360.0oC
  • B. 240.6oC
  • C. 237.0oC
  • D. 87.0oC
  • E. 36oC
View Answer & Discuss (3) WAEC 1998
2117

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
2118
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
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2119

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
2120
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
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