2009 - WAEC Physics Past Questions & Answers - page 1

1
In which of the following states of matter do the molecules vibrate about their mean positions?
A
liquids only
B
solids only
C
liquids and gasses only
D
solids, liquids and gases
CORRECT OPTION: b
2
Which of the following properties of a steel bar can be measured in terms of the dimension of length only?
A
weight
B
density
C
pressure
D
volume
CORRECT OPTION: d
3
In a hydraulic press, a force of 40N is applied to the smaller priston of area 10cm2. If the area of the larger piston is 200cm2, calculate the force obtained
A
800N
B
500N
C
80N`
D
50N
CORRECT OPTION: a
\(F_2 = \frac{F_1 \times A_2}{A_1} = \frac{40 \times 200}{10} = 800N\)
4
A body of volume 0.046m3 is immersed in a liquid of density 980kgm-3 with \(\frac{3}{4}\) of its volume submerged. Calculate the upthrust on the body. [g = 10ms-2]
A
11.27N
B
33.81N
C
112.70N
D
338.10N
CORRECT OPTION: d
M = D x V

= 980 x 0.046 x \(\frac{3}{4}\) = 33.81kg

upthrust = mg = 33.81 x 10

= 338.1N
5
Which of the following types of types of motion will be produced when a pair of equal and opposite non-collinear parallel forces acts on a body?
A
vibrational motion
B
random motion
C
translational motion
D
rotational motion
CORRECT OPTION: d
6
A body moving in a circle at constant speed has i. a velocity tangent to the circle ii. a constant kinetic energy ii. an acceleration directed towards the circmference of the circle ii. an acceleration directed towards the circumference of the circle. Which of the statements above are correct?
A
i and ii only
B
ii and iii
C
ii and iii only
D
i and iii only
CORRECT OPTION: a
7
A moving body accelerates when it
A
changes its direction at constant speed
B
mauntains a constant linear speed
C
covers equal distances in equal times in a straight line
D
is acted upon by balanced forces
CORRECT OPTION: c
8
The following properties of a solid are measured on earth i. weight ii. specific heat capacity iii. density. Which of the properties will hav a different value if measured in space?
A
i only
B
ii only
C
iii only
D
ii and iii only
CORRECT OPTION: a
9
Two forces 6N and 8N, act eastwards and northwards respectively on a body. Calculate the magnitude of their equilibrant
A
2N
B
7N
C
10N
D
14N
CORRECT OPTION: c
R = \(\sqrt{A^2 + B^2} = \sqrt{6^2 + 8^2} = 10N\)
10
The period of a simple pendulum of length 80.0cm was found to have doubled when the length of the pendulum was increased by X. Calculate X.
A
26.7cm
B
40.0cm
C
160.0cm
D
240.0cm
CORRECT OPTION: d
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