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1726

A thin aluminum plate has a surface area of 1.500m at 20ºC. What will be its surface area when it is cooled to -20ºC? (Take the linear expansivity of aluminum to be 2.5 x 10-5k-1).

A. 1.503m²
B. 1.500m²
C. 1.498m²
D. 1.497m²
E. 1.490m²

View Answer & Discuss (26) JAMB 1985

1727

Two liquids, P at a temperature of 20^oC and Q at a temperature of 80^oC have specific heat capacities of 1.0Jkg^-1^oC^-1 and 1.5J kg^-1 ^oC^-1respectively. if equal masses of P and Q are mixed in a lagged calorimeter, then the equilibrium temperature is

A. 44^oC
B. 50^oC
C. 56^oC
D. 60^oC
E. 70^oC

View Answer & Discuss (7) JAMB 1985

1728

A quantity of gas occupies a certain volume when the temperature is -73oC and the pressure is 1.5 atmospheres. If the pressure is increased to 4.5 atmospheres and the volume is halved at the same time, what will be the new temperature of the gas?

A. 573^oC
B. 327^oC
C. 300^oC
D. 110^oC
E. 27^oC

View Answer & Discuss (4) JAMB 1985

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1729

In a gas experiment, the pressure of the gas is plotted against the reciprocal of the volume of the gas at a constant temperature. the unit of the slope of the resulting curve is