2010 - WAEC Physics Past Questions & Answers - page 1

1
Which of the following properties of a long steel bar would alter if the bar were melted, recast into a cube and allowed to cool to its original temperature?
A
sensity
B
volume
C
specific heat capacity
D
electrical resistance
CORRECT OPTION: b
2
Which of the following instruments is best for measuring the diameter of a thin constantan wire?
A
callipers
B
metre rule
C
micometer screw guage
D
vernier callipers
CORRECT OPTION: c
3
What is the density of a fuel of relative density 0.72? [Density of water = 1000kg m-3]
A
72 kgm-3
B
720 kgm-3
C
7200 kgm-3
D
72000 kgm-3
CORRECT OPTION: b
P = 0.72 x 1000 = 720
4
The types of motion which a cylindrical drum rolling down an inclined plane undergoes are
A
circular and translational
B
rotational and translational
C
rotational and circular
D
rectilinear and circular
CORRECT OPTION: b
5
Which of the following statements about static friction is correct? It
A
is independent of the nature of the surface in contact
B
depends on the area of surface in contact
C
depends on the relative motion between the surface in contact
D
depends on the weight of the moving body
CORRECT OPTION: c
6
Which of the following statements about moving particle is correct?
A
if the resultant force acting on the particle is zero, then it is in dynamic equillibrium
B
If the resultant force acting on the acting on the particle is greater than zero, then it is moving with a uniform velocity
C
the rate of change of its momentum with time tales place in a direction opposite to that of its motion
D
the particle falling freely covers equal distances in equal time interval
CORRECT OPTION: d
7
Two cars X and Y travelling in opposite directions along the same high way at uniform velocities 110 kmh-1 and 90kmh-1 respectively pass each other at a certain point. The velocity of X relative to Y at the time they pass each other is
A
200 kmh-1
B
100 kmh-1
C
40 kmh-1
D
20 kmh-1
CORRECT OPTION: a
R = 110 + 90 = 200
8
The average speed of an object is determined by dividing the sum of its initial and final speeds by two only when the acceleration is
A
changing
B
uniform
C
increasing
D
decreasing
CORRECT OPTION: b
9
a body is projected horizonatlly from the top of a cliff 45m above the ground. if the body lands at a distance 30m from the foot of the cliff, calculate the speed of projection. [g = 10ms-2]
A
10ms-1
B
15ms-1
C
20ms-1
D
30ms-1
CORRECT OPTION: d
V2 = U2 + 2gh

= 02 + 2 x 10 x 45 = 30
10
Which of the following statements best describes a rigid body? A body which
A
is not equally deformed
B
when deformed regains it shape
C
is brittle
D
when deformed remains deformed
CORRECT OPTION: a
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