WAEC Physics Past Questions, Answers, And Explanations - Physics

Waec Physics Questions

Question 276:

WAEC 1992

A pipe closed at one end is 1.0m long. The air in the pipe is set into vibration and a fundamental note of frequency 85Hz is produced. Calculate the velocity of sound in the air. (Neglect end correction).

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A 340.0ms^-1
B 33Oms^-1
C 170ms^-1
D 85.0ms^-1
E 42.5ms^-1

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Question 277:

WAEC 1992

The diagram above shows the magnetic field around a bar magnet which has its N-pole pointing north. The neutral points in the field are likely to occur at

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A 1 and 2
B 3 and 4
C 5 and 6
D 7 and 8
E 9 and 10

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Question 278:

WAEC 1992

A negatively charged rod is brought near the cap of a gold-leaf electroscope. The cap is earthed momentarily while the rod is near to it. The rod is then removed. Which of the following is correct?

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A The cap will be positively charged and the negatively charged leaves will diverge
B The cap will be negatively charged and the positively charged leaves will diverge
C The cap and the leaves will be positively charged
D The cap and the leaves will be negatively charged.
E The leaves will not diverge because the cap has been earthed.

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Question 279:

WAEC 1992

Calculate the rate at which energy is used up in the circuit illustrated by the diagram

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