Jamb Physics 2019 Past Questions and Answers

Question 86:

• JAMB 2019

Workdone on an object to bring it to a certain point in space is called

A. Gravitational potential energy
B. Potential energy
C. Kinetic energy
D. Mechanical energy

Question 87:

• JAMB 2019

A copper rod, 5m long when heated through 20c, expands by 1mm. If a second copper rod, 2.5m long is heated through 5c, by how much will it expand?

A. 4mm
B. 2mm
C. 0.25mm
D. 0.12mm

Question 88:

• JAMB 2019

A safety precaution designed to prolong the life of a lead acid accumulator is

A. By topping up the cells with concentrated acid
B. The use of naked flame when charging the battery
C. Keeping the specific gravity of the electrolyte within specified range
D. By connecting wires to the terminals directly when testing the level of charging

Question 89:

• JAMB 2019

The mass of water vapour in a given volume of air is 0.05g at 20°C, while the mass of water vapour required to saturate it at the same temperature is 0.15g. Calculate the relative humidity of the air.

A. 3.33%
B. 5.55%
C. 33.33%
D. 55.55%

Question 90:

• JAMB 2019

The angular dispersion of a prism depends on

A. The index of refraction only
B. The angle of incidence as well as the index of refraction
C. The angle of incidence only
D. The thickness of the prism only