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2014 - WAEC Physics Past Questions and Answers - page 2

11

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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12

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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13

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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14

The S.I unit of power is

A
N
B
Pa
C
W
D
J
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15

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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16

Heat transfer by conduction is similar to wave motion because

A
there is increase in temperature
B
transfer of naterials is involved
C
xharged particles vibrates at right angles
D
no transfer of materials is involved
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17

The temperature at which the water vapour in the air saturates the air and begins to condense is known as

A
dew point
B
critical point
C
boiling point
D
tripple point
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18

The change of state from solid to liquid occurs

A
at constant temperature
B
when temperature is lower than the boiling point
C
when temperature is just near freezing point
D
when teemperature is equal ro the boiling point
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19

which of the following types of thermometers can be used to measure a range of temperature from -50oC to 50o? i. Clinical ii. Mercury iii. Alcohol-in-glass

A
i only
B
ii only
C
iii only
D
i and ii only
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20

A body of mass M kg rests on a plane inclined at an angle (\theta) to the horizontal. The component of the weight of the body parallel to the plane is

A
Mg sin \(\theta\)
B
Mg cos \(\theta\)
C
Mg tan \(\theta\)
D
Mg sec \(\theta\)
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