Jamb Physics 1987 Past Questions and Answers

Question 11:

• JAMB 1987

A load of 5N gives an extension of 0.56cm in a wire which obeys Hooke's law. What is the extension caused by a load of 20N?

A. 1.12cm
B. 2.14cm
C. 2.24cm
D. 2.52cm

Question 12:

• JAMB 1987

A cube of side 10cm and mass 0.5kg floats in a liquid with only \(\frac{1}{5}\) of its height above the liquid surface. What is the relative density of the liquid?

A. 0.125cm^-1
B. 0.250gcm^-1
C. 0.625cm^-1
D. 2.500cm^-1

Question 13:

• JAMB 1987

The distance between the fixed points of a centigrade thermometer is 20cm. What is the temperature when the mercury level is 4.5cm above the lower mark?

A. 22.5^oC
B. 29.0^oC
C. 90.0^oC
D. 100.0^oC

Question 14:

• JAMB 1987

The length of a side of a metallic cube at 20^oC is 5.0cm. Given that the linear expansivity of the metal is 4.0 x 10^-5k^-1, find the volume of the cube at 120^oC .

A. 126.50cm³
B. 126.25cm³
C. 126.00cm³
D. 125.00cm³

Question 15:

• JAMB 1987

As a result of air at the top of a barometer, the height of the mercury column is 73.5cm when it should be 75.0cm; the volume of the space above the mercury is 8.0cm³. Calculate the correct barometer height when the barometer reads 74.0cm and the volume of the space above the mercury is 6.0cm³.

A. 72.0cm
B. 74.5cm
C. 75.1cm
D. 76.0cm