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Physics Past Questions and Answers

Waec Physics Questions

Question 1596:

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]

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

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Question 1597:

A device that converts mechanical energy into electrical energy is

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A A dynamo
B An electric motor
C An induction coil
D A transformer

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Question 1598:

The S.I unit of power is

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A N
B Pa
C W
D J

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Question 1599:

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

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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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Question 1600:

Heat transfer by conduction is similar to wave motion because

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A There is increase in temperature
B Transfer of materials is involved
C Charged particles vibrates at right angles
D No transfer of materials is involved

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