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951
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
952
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
953
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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954
The S.I units of frequency, period and amplitude of a wave are respectively
  • A. hertz, second and centimeter
  • B. second, metre and hertz
  • C. metre, hertz and seconds
  • D. hertz, second and metre
View Answer & Discuss WAEC 2006
955
a note of frequency 2000Hz has a velocity of 400 ms-1. calculate the wavelength of the note
  • A. 5.0m
  • B. 2.0m
  • C. 0.5m
  • D. 0.2m
View Answer & Discuss (3) WAEC 2006
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