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Physics 2006 WAEC Past Questions

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21
The silvered surface in a vacuum flask reduces heat loos due to
  • A. conduction
  • B. convection
  • C. radiation
  • D. evaporation
View Answer & Discuss WAEC 2006
22
How long will it take to heat 3kg of water from 28oC to 88oC in an electric kettle taking 6a from a 220V supply? [specific heat capacity of water = 4180 J kg-1K-1]
  • A. 120s
  • B. 570s
  • C. 600s
  • D. 836s
View Answer & Discuss (3) WAEC 2006
23
The amount of energy required to change a kilogram of ice in water without a change in temperature is
  • A. heat capacity of ice
  • B. specific heat capacity
  • C. specific latent heat of vaporisation of ice
  • D. specific latent heat of fusion of ice
View Answer & Discuss WAEC 2006
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24
A quantity of steam at 100oC condenses to water at the same temperature by releasing 6.9 x 104J of energy. Calculate the mass of the condensed steam. [specific latent heat of vaporization of eater = 2.3 x 106 J kg-1]
  • A. 3.0 x 10-1 kg
  • B. 3.0 x 10-2 kg
  • C. 3.0 x 10-3 kg
  • D. 3.0 x 10-4 kg
View Answer & Discuss WAEC 2006
25
The temperature of a liquid falls after some of it has evaporated because
  • A. the liquid left is smaller in volume and the breeae easily cools it
  • B. the more energetic molecules have escaped into the atmosphere
  • C. the liquid left has less latent heat
  • D. after evaporation impurites are left behind
View Answer & Discuss (1) WAEC 2006
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