# 2007 - WAEC Physics Past Questions and Answers - page 1

1

Which of the following observations is not an effect of surface tension?

A

droplets of water dripping slowly from a tap

B

mercury spilled on a clean glass plate forms spherical droplets

C

an indect walking across the surface of a pond

D

water flowing out more easily then engine oil from a container

**correct option:**d

2

Which of the following physical quantities is correctly paired with it's corresponding S.I unit?

A

density[kg m

^{3}]B

power[Js

^{-1}]C

specific latent heat [J kg

^{-1}K^{-1}D

Pressure [Nm

^{-1}]**correct option:**b

3

A liquid of volume 2.00 m

^{3}and density 1.00 x 10^{3}is mixed with 3.00 m^{3}of another liquid of density 8.00 x 10^{3}kg m^{-3}. Calculate the density of the mixture [Assuming there is no chemical reaction]A

5.20 x 10

^{2}kg m^{-3}B

1.13 x 10

^{3}kg m^{-3}C

8.80 x 10

^{2}kg m^{-3}D

5.20 x 10

^{2}kg m^{-3}**correct option:**d

\(V_T = 5m^3, m_1 = 2 \times 1 \times 10^3 = 2 \times 10^3\)

\(M_2 = 3 \times 8 \times 10^3 = 24 \times 10^3\)

M

D = \(\frac{m}{v} = \frac{26 \times 10^3}{5} = 5.2 \times 10^3\)

Users' Answers & Comments\(M_2 = 3 \times 8 \times 10^3 = 24 \times 10^3\)

M

_{T}= 26 x 10^{3}D = \(\frac{m}{v} = \frac{26 \times 10^3}{5} = 5.2 \times 10^3\)

4

Which of the following statements about solid friction are correct? It i. is a force ii. occurs between the surfaces of two bodies in contact iii. depends on the area in contact

A

i and ii only

B

i adnd iii only

C

ii and iii only

D

i, ii and iii

**correct option:**a

5

A mass of mass m, experiences a viscous drag, F and an upthrust, U as he descends towards the ground at a steady velocity, Using a parachute. If the acceleration of free fall is g, which of the following expressions is correct?

A

FU = mg

B

U + F - mg = 0

C

U - F = mg

D

F - U - mg = 0

**correct option:**b

6

a body moving at a constant speed accelerates when it is in

A

rectilinear motion

B

translational motion

C

circular motion

D

vibrational motion

**correct option:**a

7

An object of mass 2 kg moves with a uniform speed of 10ms

^{-1}for 5s along an straight path. Determine the magnitude of its accelerationA

0 ms

^{-2}B

1 ms

^{-2}C

3 ms

^{-2}D

4 ms

^{-2}8

The team rectilinear acceleration means the rate of increase of

A

velocity along a circular path in a unit time

B

distance along a rectangular path in a unit time

C

displacement along a straight-line path in a unit time

D

velocity along a straight-line path in a unit time

**correct option:**d

9

A body moving with an initial velocity U accelerates until it attains a velocity of V within a time t. The distance, s covered by the body is given by the expressions

A

s = (\(\frac{v - u}{2}\))t

B

s = (\(\frac{v + 2u}{2}\))t

C

s = (\(\frac{v + u}{2}\))t

D

s = (\(\frac{2v + u}{2}\))t

**correct option:**c

10

A body accelerates uniformly from rest at 2ms

^{-2}. Calculate the magnitude of its velocity after travelling 9mA

4.5 ms

^{-1}B

6.0ms

^{-1}C

18.0

^{-1}D

36.0

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

v = \(\sqrt{U^2} + 2as = \sqrt{0^2} + 2 \times 2 \times 9 = 6\)m/s

Users' Answers & Comments