1993 - WAEC Physics Past Questions & Answers - page 1

1
Which of the following is not an example of a force?
A
Tension
B
Weight
C
Friction
D
Mass
CORRECT OPTION: d
2
A body moves along a circular path with uniform angular speed of 0.6 rad s-1 and at a constant speed of 3.0ms-1. Calculate the acceleration of the body towards the centre of the circle.
A
25.0ms-2
B
5.4 ms-2
C
5.0ms-2
D
1.8 ms-2
CORRECT OPTION: d
A = wv = 0.6 x 3.0 = 1.8m-2
3
Which of the following is a derived unit?
A
Ampere
B
Kilogramme
C
Second
D
Ohm
CORRECT OPTION: d
4
A body timed 20 oscillations of a certain pendulum three times and obtained 44.3s, 45.5s and 45.7s respectively. Calculate the mean period of oscillation of the pendulum
A
0.13s
B
2.22s
C
2.26s
D
44.30s
CORRECT OPTION: c
5
A body of mass M1 moving with a velocity U collides with a stationary body of mass M2 and both move with a common velocity V lf linear momentum is conserved, which of the following expressions correctly represents V?
A
M1 U/M1 + M2
B
M2 U/M1 + M2
C
M1 + M2/M1 U
D
M1 - M2/M1 U
CORRECT OPTION: a
M1U + M2 x 0 = (M1 + M2)v
V =
M1 U/M1 + M2
6
A body of mass m = 0.5 kg is suspended by a string and pulled by a horizontal force of 1g N as shown in the 12N diagram: Calculate the tension T in the String if the body is in equilibrium. [Take g as 10ms-1]
A
7.0
B
10.9
C
12.5
D
13.0
CORRECT OPTION: d
Mg = 5N
T2 = 52 + 122T = 13N
7
A particle starts from rest and moves with a constant acceleration of 0.5 ms-2? Calculate the time taken by the particle to cover a distance of 25m.
A
25s
B
7.1s
C
10.0s
D
50.0s
CORRECT OPTION: c
S = ut + 1/2at2
25 = 0 + 1/2 x 0.5t2
T = 10s
8
A block of material of volume 2 X 1O-5m3 and density 2.5 x 10-3 kgm-3 is suspended from a spring balance with half volume of the block immersed in water. What is the reading of the spring balance? (Density of water =1.0x103 kg m-3 g = 10 ms-2).
A
0.10N
B
0.25N
C
0.30N
D
0.40N
CORRECT OPTION: d
Weight of object = mg = pvg = 2.5 x 103 x 2 x 10-5 x 10 = 0.5N; Upthrust = weight of displaced fluid = pvg water
= 1.0 x 103 x
2 x 10-5/2 x 10 = 0.1N
∴Reading = 0.5 – 0.1 = 0.4N
9
An object is projected with a velocity of 100 ms-1 from the ground level at an angle 0 to the vertical. If the total time of flight of the projectile is 10 s, calculate θ. (g = 10 ms-2).
A
0o
B
30o
C
45o
D
60o
CORRECT OPTION: b
T =
2u sinθ/g
sinθ =
Tg/2u =
10 x 10/2 x 100 = 0.5
,θ = sin-10.5 = 30o
10
How far will a body move in 4 seconds if uniformly accelerated from rest at the rate of 2 ms-2?
A
32m
B
24m
C
16m
D
1.2m
CORRECT OPTION: c
S = vt + 1/2 at2 = 0 + 1/2 x 2 x 42 = 16m
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