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1.
I. Diameter of a small ball bearing.
II. Thickness of a pieces of paper.
III. Diameter of a measuring cylinder.
IV. Length of a piece of wire.
Which of the above can be measured using a micrometer screw gauge?
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A.
I, II and IV only .
B.
I and II only
C.
II and III only
D.
III and IV only
Explanation. Give a better Explanation
Of all the instruments used in measuring length,the micrometer screw gauge has the highest reading accuracy (0.01 mm), and is therefore used in measuring very small length such as diameter of a small ball bearing, and thickness of a piece of paper.


2.
What is the acceleration between two points on a velocity time graph which has coordinates
(10s, 15 ms-1)
and (20 s, 35 ms-1)?
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A.
1.7 ms-2
B.
3.50 ms-2
C.
1.00 ms-2
D.
2.00 ms-2
Explanation. Give a better Explanation
Acceleration = (AV)/At = (V2) - U1)/t2 - t1 = (35 - 15)/20 - 10 = (20)/10 = 2m5-2


3.
A bullet fired vertically from upward from a gun held 2.0 m above the ground reaches its maximum height in 4.0s. calculate its initial velocity.


[g = 10ms-2]
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A.
10 ms-1
B.
8 ms-1
C.
40 ms-1
D.
20 ms-1
Explanation. Give a better Explanation
At maximum height, the final velocity, v = 0
thus from v = u + at
0 = u - at
U = at = 10 x 4 = 40 mls


4.
I. The motion of the tyres of a moving car.
II. The motion of a loaded test tube oscillated
vertically.
III. The beating of the heart.
IV. A stone tied to a string and whirled round.
V. The motion of the pistons in a gasoline engine.
Which of the motions above is simple harmonic?
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A.
III, IV and V only
B.
II, III and V only
C.
II, III and IV only
D.
I,II and III only
Explanation. Give a better Explanation
Simple harmonic motion is the motion of a body whose acceleration is directed towards a fixed point and is directly proportional to its displacement from point.


5.
If a cage containing a truck of coal weighing 750 kg is raised to a height of 90 m in a minute, what is the total power expended?


[g = 10 ms2]
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A.
11.50 kw
B.
12.60 kw
C.
11.25 kw
D.
12.10 kw
Explanation. Give a better Explanation
Power = (work done)/time taken = (mgh)/t
= (750 x 10 x 90)/60 = 11250w = 11.25kw


6.
An object of mass 80 kg is pulled on a horizontal rough ground by a force of 500 N. Find the coefficient of static friction.


[g = 10 ms-2]
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A.
0.8
B.
0.4
C.
1
D.
0.6
Explanation. Give a better Explanation
coefficient of friction = (F)/R = (F)/ mg = (500)/80 x 10
= 0.625


7.
If a heavy barrel is rolled up a plane inclined at 30 to the horizontal. its velocity ratio will be
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A.
3
B.
3.1
C.
3.2
D.
2
Explanation. Give a better Explanation
V.R = (1)/sin = (1)/sin 30 = (1)/(1)/2 = 2


8.
I. Density of the liquid.
II. Acceleration due to gravity.
III. Type of container of the liquid.
IV. The constituents of the liquid.
which of the above conditions will NOT affect the pressure of fluid?
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A.
I and III only
B.
II and III only
C.
III and IV only
D.
I and II only
Explanation. Give a better Explanation
pressure in fluid is given by P = hlg.
fluid pressure depends on height of liquid column, h, density of liquid p and acceleration of free fall 8. it is therefore independent of type of container and constituents of the liquid


9.
If a load of mass 10N stretched a cord by 1.2cm, what is the total work done?
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A.
6.0 x 10-2J
B.
7.6 x 10-2J
C.
1.8 x 10-2J
D.
6.6 x 10-2J
Explanation. Give a better Explanation
Work done on a stretched cord
= Average force x extension
= (10 + 0)/2 x 1.2 x 10-2
= 6.0 x 10-2J


10.
A plastic sphere floats in water with 50% of its volume submerged. if it floats in glycerine with 40% of its volume submerged,the density of the glycerine is?
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A.
1400 kgm-3
B.
1250 kgm-3
C.
500 kgm-3
D.
1000 kgm-3
Explanation. Give a better Explanation
Weight of glycerine displaced = weight of water dispalced
Mgh glycerine = Mgh water
Pvgh glycerine = Pvgh water
0.4V P glycerine = (0.5v)/v.4v P water = 1.25
(Polycerine)/p water =
But density of substance = relative density x density of water = 1. 25 x 1000kgm3 = 1250kgm-3


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