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Physics 2005 WAEC Past Questions

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21
The energy required to change a solid to liquid at constant temperature is called
  • A. thermal capacity
  • B. has lower specific heat capacity
  • C. latent heat of fusion
  • D. latent heat of vaporisation
View Answer & Discuss WAEC 2005
22
Which of the following statements about boiling and evaporation at atmospheric pressure is correct?
  • A. evaporation and boiling of water take place at 100o
  • B. evaporation of water takes place at a temperature greater than 100oC, while boiling takes place at 100oC
  • C. evaporation of water takes place at 100oC while boiling takes place at a higher temperature
  • D. boiling takes place at 100o while evaporation my take place at temperatures lower than 100oC
View Answer & Discuss (1) WAEC 2005
23
Which of the following statements is correct?
  • A. the density of a liquid decreases when it expands
  • B. the density of a liquid increases when the liquids are heated
  • C. the real expansivity of a liquid is less than its apparent expansivity
  • D. a liquid changes to solid when heated to a sufficiently high temperature
View Answer & Discuss (1) WAEC 2005
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24
The pressure exerted by a given mass of gas in a container
  • A. decreases if the container is heated
  • B. increases if the molecules of the gas move faster
  • C. increases if the container is doubled
  • D. decreases as the kinetic energy of the gas molecules inceases
View Answer & Discuss WAEC 2005
25
Which of the following statements about a progressive mechanical wave is correct?
  • A. it can be a plane polarised
  • B. its energy is localised at specific points of its profile
  • C. it does not require a material medium for its propagation
  • D. its frequency remains constant as it travels between different media
View Answer & Discuss (1) WAEC 2005
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