Waec Physics 2002 Past Questions and Answers

Question 41:

• WAEC 2002

The lead-acid accumulator consists of a

A. Lead as the positive electrode
B. Lead ocide as the negative electrode
C. Hydrochloric acid as the electrolyte
D. Tetraoxosulphate(VI) acid as the electrolyte

Question 42:

• WAEC 2002

Which of the following actions will not lead to an increase in the induced e.m.f. in a coil of wire rotating between the poles of a magnet? Increasing the

A. Strength of the magnet
B. Number of turns in the coil
C. Speed of location in the coil
D. Gap between the poles of the magnet

Question 43:

• WAEC 2002

A transformer has 400 turns and 200 turns in the primary and secondary windings respectively. If the current in the primary and secondary windings are 3A and 5A respectively. calculate the efficiency of the transformer?

A. 85.0%
B. 83.3%
C. 37.5%
D. 30.0%

Question 44:

• WAEC 2002

A freely-suspended magnet swinging in a horizontal plane comes to rest with its axis pointing approximately

A. North-south
B. South-west
C. North-east
D. South-east

Question 45:

• WAEC 2002

Calculate the inductance L, of the coil in the circuit diagram shown above

A. 3.8H
B. 0.6H
C. 0.4H
D. 0.2H