## Physics 2009 | Study Mode

Question 1
A
I, II and IV only .
B
I and II only
C
II and III only
D
III and IV only
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.

Question 2
A
1.7 ms-2
B
3.50 ms-2
C
1.00 ms-2
D
2.00 ms-2
Explanation.
Acceleration = (AV)/At = (V2) - U1)/t2 - t1 = (35 - 15)/20 - 10 = (20)/10 = 2m5-2

Question 3
A
10 ms-1
B
8 ms-1
C
40 ms-1
D
20 ms-1
Explanation.
At maximum height, the final velocity, v = 0
thus from v = u + at
0 = u - at
U = at = 10 x 4 = 40 mls

Question 4
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.
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.

Question 5
A
11.50 kw
B
12.60 kw
C
11.25 kw
D
12.10 kw
Explanation.
Power = (work done)/time taken = (mgh)/t
= (750 x 10 x 90)/60 = 11250w = 11.25kw

Question 6
A
0.8
B
0.4
C
D
0.6
Explanation.
coefficient of friction = (F)/R = (F)/ mg = (500)/80 x 10
= 0.625

Question 7
A
B
3.1
C
3.2
D
Explanation.
V.R = (1)/sin = (1)/sin 30 = (1)/(1)/2 = 2

Question 8
A
I and III only
B
II and III only
C
III and IV only
D
I and II only
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

Question 9
A
6.0 x 10-2
B
7.6 x 10-2
C
1.8 x 10-2
D
6.6 x 10-2
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

Question 10
A
1400 kgm-3
B
1250 kgm-3
C
500 kgm-3
D
1000 kgm-3
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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