Jamb Physics 2018 Past Questions and Answers

Question 81:

• JAMB 2018

An object weighs 30N in air and 21N in water. The weight of the object when completely immersed in a liquid of relative density 1.4 is

A. 25.2N
B. 17.4N
C. 12.6N
D. 9.0N

Question 82:

• JAMB 2018

Which of the following instruments is most suitable for measuring the outside diameter of a narrow pipe in a few millimeters in diameter?

A. Pair of calipers
B. Meter rule
C. Micrometer screw gauge
D. Tape rule

Question 83:

• JAMB 2018

Electrical power is transmitted at a high voltage rather than a low voltage because the amount of energy loss is due to

A. Heat dissipation
B. Production of eddy currents
C. Excessive current discharge
D. Excessive voltage discharge

Question 84:

• JAMB 2018

If the focal length of a camera is 20cm, the distance from the film at which the lens must be set to produce a sharp image of 100cm away is

A. 17cm
B. 20cm
C. 25cm
D. 100cm

Question 85:

• JAMB 2018

The image of an object is located 6cm behind a convex mirror. If it's magnification is 0.6, calculate the focal length of the mirror

A. 3.75cm
B. 6.70cm
C. 10.00cm
D. 15.00cm