# 2011 - WAEC Physics Past Questions and Answers - page 1

1

Which of the following statements is not correct?

A

molecules of ice, water and water vapour have equal intermolecular distances

B

molecules of ice, water and water vapour do not differ in the structure of their molecules

C

molecules of water vapour attract each other with forces far less than the forces of attraction between water molecules

D

water is less compressible than water vapour

**Answer & Comments**

**correct option:**a

2

The density P of a spherical ball of diameter d and mass m is given by

A

P = \(\frac{3m}{4 \pi d^3}\)

B

p = 4\(\pi md^3\)

C

p = \(\frac{6m}{\pi d^3}\)

D

p = \(\frac{3m}{2 \pi d^3}\)

**Answer & Comments**

**correct option:**c

p = \(\frac{M}{V} = \frac{M}{\frac{4}{3} \pi (\frac{d}{\pi})^3}\)

= \(\frac{6m}{\pi d^3}\)

Users' Answers & Comments= \(\frac{6m}{\pi d^3}\)

3

A metal rod of density 7000 kgm

^{-3}and cross-sectional area of 0.001257m^{2}has a mass of 1.76kg. Calculate its length.A

0.20m

B

0.25m

C

0.40m

D

0.50m

**Answer & Comments**

**correct option:**a

P = \(\frac{M}{AL}\)

L = \(\frac{M}{CA}\)

= \(\frac{1.76}{7000 \times 0.001257}\)

= 0.2m

Users' Answers & CommentsL = \(\frac{M}{CA}\)

= \(\frac{1.76}{7000 \times 0.001257}\)

= 0.2m

4

The pressure in a liquid

A

is the same at all points in the liquid

B

decreases with depth

C

is the same in all directions at a given point

D

is equal to the atmospheric pressure

**Answer & Comments**

**correct option:**c

5

The property of a fluid that is used to determine its suitability as a lubricant is its

A

capillarity

B

viscocity

C

surface tension

D

relative density

**Answer & Comments**

**correct option:**b

6

The area under a velocity-time graph represents

A

final velocity attained

B

distance covered

C

acceleration

D

workdone

**Answer & Comments**

**correct option:**b

7

In the absence of gravitational force, the weight of the body is

A

its mass

B

zero

C

its density

D

its volume

**Answer & Comments**

**correct option:**b

8

Which of the following propeties is not considered in choosing mercury as a thermomemetric liquid?

A

density

B

expansivity

C

conductivity

D

opacity

**Answer & Comments**

**correct option:**a

9

A stone of mass 300g is released from rest from the top of a bulding of height 100m. Determine the kinetic energy gained by the stone when it is a quarter way down from the point of release.[g = 10 ms

^{-2}]A

750.0J

B

225.0J

C

75.0J

D

22.5J

**Answer & Comments**

10

A body of mass 120g placed at the 10cm mark on a uniform metre rule makes the rule settle horizontally on a fulcrum places at 35cm mark. Calculate the mass of the rule

A

60g

B

80g

C

120g

D

200g

**Answer & Comments**