Physics 2014 WAEC Past Questions

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The period of a simple pendulum X is 5s. What is the period of a simple pendulum Y which makes 50 vibrations in the same time it takes X to make 20 vibrations?

A. 12.5s
B. 2.5s
C. 2.0s
D. 1.2s

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Alcohol of mass 21g and density 0.7g cm^-3 is mixed with 10g of water. Determine the density of the mixture [density of water = 1.0gcm^-3]

A. 0.775gcm^-3
B. 0.875gcm^-3
C. 0.780gcm^-3
D. 0.880gcm^-3

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A device that converts mechanical energy into electrical energy is

A. a dynamo
B. an electric motor
C. an induction coil
D. a transformer

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The S.I unit of power is

A. N
B. Pa
C. W
D. J

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A screw-jack has the distance between its successive threads as P and the length of its tommy bar as r. Its velocity ratio is given by the expression

A. \(\frac{2 \pi r^2}{P}\)
B. \(\frac{2 \pi r}{P}\)
C. \(\frac{2 \pi}{rp}\)
D. \(\frac{P}{2 \pi r}\)

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