2007 - WAEC Physics Past Questions & 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 m3]
B
power[Js-1]
C
specific latent heat [J kg-1K-1
D
Pressure [Nm-1]
CORRECT OPTION: b
3
A liquid of volume 2.00 m3 and density 1.00 x 103 is mixed with 3.00 m3 of another liquid of density 8.00 x 103kg m-3. Calculate the density of the mixture [Assuming there is no chemical reaction]
A
5.20 x 102 kg m-3
B
1.13 x 103 kg m-3
C
8.80 x 102 kg m-3
D
5.20 x 102 kg m-3
CORRECT OPTION: d
$$V_T = 5m^3, m_1 = 2 \times 1 \times 10^3 = 2 \times 10^3$$

$$M_2 = 3 \times 8 \times 10^3 = 24 \times 10^3$$

MT = 26 x 103

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
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 acceleration
A
0 ms-2
B
1 ms-2
C
3 ms-2
D
4 ms-2
CORRECT OPTION: a
a = $$\frac{v - u}{t} = \frac{10 - 10}{5} = 0$$m/s
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 9m
A
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
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