Physics 1988 WAEC Past Questions

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In which of the following is the expansion of solids a disadvantage?

A. the fitting of wheels in rims
B. fire alarms
C. the thermostat
D. the bimatellic thermometer
E. the balance wheel of a watch

View Answer & Discuss (4) WAEC 1988

Which of the following best explains a person suffers more severe burns when his skin is exposed to steam than when boiling water is poured onto his skin?

A. steam is at a higher temperature than boiling water
B. steam posses greater heat energy per unit-mass than boiling water
C. steam spreads more easily over a wider area of the skin than boiling water
D. steam panetrates more easily over a wider area of the skin than boiling water
E. the specific latent heat of vaporization is released in changing from boiling water to steam

View Answer & Discuss (3) WAEC 1988

Which of the following statements about radiant heat is/are not correct?
I. radiant heat cannot travel through a vacuum
II. rough surfaces emit radiant heat more than polished surfaces
III. Dark surfaces absorb radiant heat more than bright surfaces

A. I only
B. II only
C. III only
D. I & II only
E. II & III only

View Answer & Discuss (22) WAEC 1988

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0.5kg of water at 10^oC is completely converted to ice by extracting 188000J of heat from it. If the specific heat capacity of water is 4200J kg^-1C^-1, calculate the specific latent heat of fusion of ice.