# 2000 - WAEC Physics Past Questions and Answers - page 1

1

The diagram above illustrates three forces T

_{1}, T_{2}and 100N in equilibrium. Determine the magnitude of T_{1}A

100 tan 30

^{o}B

\(\frac{100}{\cos 30^o}\)

C

200 sin 30

^{1}D

\(\frac{200}{tan 30^o}\)

**correct option:**a

2

An iron rod is moved from the earth to the moon. Which of the following properties of the rod would remain unchanged? i. mass ii. weight iii. relative density

A

i only

B

ii only

C

iii only

D

i and iii only

**correct option:**d

3

A uniform cylindrical hydrometer of mass 20g and cross sectional area 0.54cm

^{2}floats upright in a liquid. If 25cm of its length is submerged, calculate the relative density of the liquid. (Density of water = 1 gcm^{-3})A

1.54

B

1.48

C

1.25

D

0.80

**correct option:**b

4

The apparent weight of a body wholly immersed in water is 32N and its weight in air is 96N. Calculate the volume of the body. (Density of water = 1000kgm

^{-3}, g = 10ms^{-3})A

8.9 x 10m

^{-3}m^{3}B

6.4 x 10m

^{-3}m^{3}C

3.2 x 10m

^{-3}m^{3}D

3.0 x 10m

^{-3}m^{3}**correct option:**b

5

A wooden block of mass 1.6kg rest on a rough horizontal surface, if the limiting friction force between the block and the surface is 8N. Calculate the coefficient of friction. (g = 10ms

^{-2})A

0.6

B

0.5

C

0.3

D

0.2

**correct option:**b

6

A ball bearing is gently released from rest and allowed to fall through a viscous fluid. Which of the following statements about the motion is correct?

A

its acceleration decreases before terminal velocity is attained

B

when terminal velocity is attained the acceleration of the fluid becomes zero

C

its velocity increases before terminal velocity is attained

D

there is no resultant force on the ball before it attains terminal velocity

**correct option:**b

7

The driver of a car moving with uniform speed of 40ms

^{-1}observes a truck approaching from the opposite direction with a speed of 20ms^{-1}. Calculate the speed of the car relative to that of the truckA

.5ms

^{-1}B

2.0ms

^{-1}C

20.0ms

^{-1}D

60.0ms

^{-1}**correct option:**d

8

A bus travelling at 15ms

^{-1}accelerates uniformly at 4ms^{-2}, what is the distance covered in 10s?A

150m

B

170m

C

350m

D

600m

**correct option:**c

9

A uniform metre rule of mass 90g is provided at the 40cm mark. If the rule is in equilibrium with an unknown mass m placed at the 10cm mark and a 72g mass at the 70cm mark, determine m

A

72g

B

102g

C

298g

D

504g

**correct option:**b

10

The resultant of two forces acting on an object is maximum when the angle between them is

A

180

^{o}B

90

^{o}C

45

^{o}D

0

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