Waec Physics 1988 Past Questions and Answers

Question 41:

• WAEC 1988

A lamp is marked 220V 60 W. Calculate the energy it would consume when connected to a 220V source for 1 hour.

A. 216000J
B. 13200J
C. 3600J
D. 864J
E. 220J

Question 42:

• WAEC 1988

What is the effect of using split-rings in a simple d.c motor?

A. The direction of rotation of the coil is reversed
B. The current in the coil flows in the same direction
C. The current in the coil becomes alternating
D. The direction of the force on the coil is reversed
E. The contact with the voltage is cut-off

Question 43:

• WAEC 1988

Which of the following statement is not correct about loaded spiral spring?

A. The extension is proportional to the load applied, provided the elastic limite is not exceeded
B. If the elsatic limit is not exceeded, the contraction is proportional to the load removed.
C. Up to the yield limit, extension is no longer proportional to the applied load.
D. Beyond the elsatic limit, extension is no longer proportional to the applied load.
E. If the string regains its shape or form after deformation, it is said to be elastic.

Question 44:

• WAEC 1988

Calculate the resistivity of a wire of length 2m and cross-sectional area 0.004cm² if the resistance is 3.0 Ω.

A. 0.0000267Ωcm
B. 0.006Ωcm
C. 0.26700Ωcm
D. 0.27500Ωcm
E. 0.060000Ωcm

Question 45:

• WAEC 1988

Which of the following particles of ray has the highest penetrating power?

A. Beta particles
B. Alpha particles
C. Gamma particles
D. Electrons
E. Neutrons