Jamb Physics 1985 Past Questions and Answers

Question 16:

• JAMB 1985

A uniform cylindrical block of wood floats in water with one-third of its height above the water level, in a liquid of relative density 0.8, what fraction of its height will be above the liquid level?

A. \(\frac{1}{6}\)
B. \(\frac{1}{5}\)
C. \(\frac{1}{3}\)
D. \(\frac{4}{5}\)
E. \(\frac{5}{6}\)

Question 17:

• JAMB 1985

A thin aluminum plate has a surface area of 1500m^{[/sup] at 20[sup]o}C. What will be its surface area when it is cooled to -20^oC? (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

Question 18:

• JAMB 1985

Two liquids, P at a temperature of 20^oC and Q at a temperature of 80^oC have specific heat capacities of 1.0Jkg^-1oC^-1 and 1.5J kg^-1oC^-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

Question 19:

• JAMB 1985

A quantity of gas occupies a certain volume when the temperature is -73^oC 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

Question 20:

• JAMB 1985

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

A. Force
B. Force/m
C. Work
D. Force/m³
E. Energy/m³