Physics Past Questions

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631

It takes 4 minutes to boil a quantity of water electrically. How long will it take to boil same quantity of water using the same heating coil but with the current doubled? (neglecting any external heat loss).

A. 64 minutes
B. 32 minutes
C. 8 minutes
D. 2 minutes
E. 1 minute

View Answer & Discuss (6) WAEC 1988

632

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

View Answer & Discuss (3) WAEC 1988

633

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

View Answer & Discuss (12) WAEC 1988

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634

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.