Physics 1989 WAEC Past Questions

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Calculate the heat energy required to vapourize 50g of water initially at 80^oC if the specific heat capacity of water is 4.2Jg^-1K (specific latent heat of vapourization of water is 2260Jg^-1).

A. 533000J
B. 230000J
C. 117200J
D. 113000J
E. 4200J

View Answer & Discuss (2) WAEC 1989

A block of ice at its melting point is left on a table in the atmosphere and observed to melt gradually. Which of the following statements is true about the melting process?

A. the reaction force of the table on the ice breaks the ice into water molecules
B. heat extracted from the ice block makes the ice block cold
C. the ice block absorbs heat from the atmosphere and its temperature rises
D. the atmosphere absorbs heat from the ice block and its temperature falls
E. the ice block absorbs heat from the atmosphere and its temperature remains constant as it melts

View Answer & Discuss (7) WAEC 1989

All the heat generated by a current of 2A passing through a resistor of 6Ω for 25s is used to evaporate 5 g of a liquid at its boiling point. What is the specific latent heat of the liquid?