# 1993 - WAEC Physics Past Questions and 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}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

M

_{1}U/M_{1}+ M_{2}B

M

_{2}U/M_{1}+ M_{2}C

M

_{1}+ M_{2}/M_{1}UD

M

_{1}- M_{2}/M_{1}U**correct option:**a

M

Users' Answers & Comments_{1}U + M_{2}x 0 = (M_{1}+ M_{2})vV =

M

_{1}U/M_{1}+ M_{2}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

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 +

25 = 0 +

T = 10s

Users' Answers & Comments^{1}/_{2}at^{2}25 = 0 +

^{1}/_{2}x 0.5t^{2}T = 10s

8

A block of material of volume 2 X 1O

^{-5}m^{3}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 =1.0x10^{3}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 10

Users' Answers & Comments^{3}x 2 x 10^{-5}x 10 = 0.5N; Upthrust = weight of displaced fluid = pvg water= 1.0 x 10

^{3}x2 x 10

∴Reading = 0.5 – 0.1 = 0.4N

^{-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

0

^{o}B

30

^{o}C

45

^{o}D

60

^{o}**correct option:**b

T =

2u sinθ/g

sinθ =

Tg/2u =

10 x 10/2 x 100 = 0.5

,θ = sin

,θ = sin

^{-1}0.5 = 30^{o}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 +

Users' Answers & Comments^{1}/_{2}at^{2}= 0 +^{1}/_{2}x 2 x 4^{2}= 16m