# 2008 - WAEC Physics Past Questions & Answers - page 1

1
If the air inside a rigid box is heated, the i, average speed of the molecules increases ii. pressure of the air increases iii. average separation of the molecule increases. Which of the statements above are correct?
A
i and ii only
B
ii and iii only
C
i and iii only
D
i, ii and iii
CORRECT OPTION: a
2
Which of the following sets of quantities is fundamental?
A
length, mass and time
B
speed, length and time
C
speed, mass and distance
D
distance, speed and time
CORRECT OPTION: a
3
which of the following statements about Archimedes' principle is correct? The upthrust on a body is a measure of the
A
mass of fluid displaced
B
weight of the body
C
volume of the body
D
weight of the fluid displaced
CORRECT OPTION: d
4
Which of the following is/are in random motion? i. Pollen grains in water ii. The molecules of hydrogen gas ii. Fine chalk particles floating in air
A
i and ii only
B
i and iii only
C
ii and iii only
D
i, ii and iii
CORRECT OPTION: d
5
A car travelling with a uniform velocity of 30ms-1 along a horizontal road overcomes a constant frictional force of 600N. Calculate the power of the engine of the car
A
18kW
B
20kW
C
180kW
D
200kW
CORRECT OPTION: a
P = FV

= 600 x 30 = 18kW
6
A rectangular block of dimensions 2.0m x 1.0m x 0.5m weighs 200N. calculate the maximum pressure exerted by the block on a horizontal floor.
A
100Nm-2
B
200Nm-2
C
300Nm-2
D
400Nm-2
CORRECT OPTION: a
P = $$\frac{wt}{A} = \frac{200}{2 \times 1} = 100Nm^{-2}$$
7
A very sensitive spring balance was used to determine the weight of an object at the north pole. When the same spring balance was used to measure the weight of the same object at the equator, it was found to reduce. The explanation for this observation is that
A
it is very hot at the equator
B
the spring balance has expanded
C
the acceleration of free fall due to gravity varies with location
D
the mass of the body is reduced
CORRECT OPTION: c
8
The diagram above illustrates a Hare's apparatus. $$\mathit{e}_1, \mathit{e}_2$$ represent densities and $$\mathit{h}_1, \mathit{h}_2$$ heights of columns of liquids. Which of the following equations is correct?
A
$$\mathit{h}_1 = \frac{\mathit{h}_2 \mathit{e}_1}{\mathit{e}_2}$$
B
$$\mathit{h}_1 = \frac{\mathit{h}_2 \mathit{e}_2}{\mathit{e}_1}$$
C
$$\mathit{h}_1 = \frac{\mathit{e}_1 \mathit{e}_2}{\mathit{h}_2}$$
D
$$\mathit{h}_1 = \frac{\mathit{e}_1}{\mathit{h}_2 \mathit{e}_2}$$
CORRECT OPTION: b
$$\frac{\mathit{h}_2}{\mathit{h}_2} = \mathit{h}_1 = \frac{\mathit{h}_2 \mathit{e}_2}{\mathit{e}_1}$$
9
The diagram above represents the displacement-time graph of the motion of an object thrown upwards. The velocity of the object at the point P is
A
maximum
B
uniform
C
zero
D
terminal
CORRECT OPTION: c
10
The diagram above illustrates a bar magnet near a coil connected to a galvanometer, When the magnet is rapidly moves towards the coil i. e.m.f. is induced in the coil ii. the galvanometer needle deflects iii. the magnet is attracted by the coil. Which of the statements above is/are correct?
A
i only
B
ii only
C
iii only
D
i and iii only
CORRECT OPTION: a
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