# 1999 - WAEC Physics Past Questions & Answers - page 1

1
The force between molecules of the same substance is termed
A
elastic force
B
repulsive force
C
cohesive force
D
CORRECT OPTION: c
2
A net force of magnitude 0.6N acts on a body of mass 40g, initially at rest. Calculate the magnitude of tire resulting acceleration.
A
90ms-2
B
60ms-2
C
30ms-2
D
15ms-2.
CORRECT OPTION: d
3
Palm oil from a bottle flows out more easily after it as been heated because the
A
molecules are given potential energy during the heating
B
friction between oil layers is reduced
C
oil molecules force each other out
D
adhesion between the oil molecules and those of the bottle is increased
CORRECT OPTION: b
4
A body weighing 10N moves with a speed of 5ms-1 in a horizontal circular path of radius 5m. Calculate the . magnitude of the centripetal force acting on the body. (g = 10ms-2)
A
10N
B
50N
C
75N
D
100N
CORRECT OPTION: b
5
A motorcyclist, passing a road junction, moves due west for 8 s at a uniform speed of 5ms-1. He then moves due north for another 6 s with the same speed. At the end of the 6s his displacement from the road junction is 50m in the direction of
A
N53oE
B
N37oE
C
N53oW
D
N37oW
CORRECT OPTION: c
6
The time rate of change of displacement is known as
A
speed
B
velocity
C
impulse
D
acceleration
CORRECT OPTION: b
7
A stone of mass 0.7kg is projected vertically , upwards with a speed of 5ms-1. Calculate the maximum height reached. (Take g as 10ms-2 and neglect air resistance)
A
1.00m
B
1.25m
C
1.50m
D
3.75m
CORRECT OPTION: b
8
If the force of attraction between the sun and the 1 planets is removed; the planets will
A
fall towards the sun
B
scatter and stop moving
C
continue to move at tangent to their original orbits
D
continue to move perpendicular to their original orbits. '
CORRECT OPTION: d
9
A 15kg mass, suspended from a ceiling, is pulled aside with a horizontal force, F, as shown in the diagram above. Calculate the value of the tension, T. (g = 10ms-2)
A
300.0N
B
173.2N
C
30.0N
D
17.3N
CORRECT OPTION: b
10
A pendulum bob executing simple harmonic motion has 2cm and 12Hz as amplitude and frequency respectively. Calculate the period of the motion.
A
2.00s
B
0.83s
C
0.08s
D
0.60s
CORRECT OPTION: c
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