Physics 2009 | Study Mode

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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.

Correct Option:
B
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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

Correct Option:
D
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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

Correct Option:
C
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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.

Correct Option:
B
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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

Correct Option:
C
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Question 6
A
0.8
B
0.4
C
1
D
0.6
Explanation.
coefficient of friction = (F)/R = (F)/ mg = (500)/80 x 10
= 0.625

Correct Option:
D
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Question 7
A
3
B
3.1
C
3.2
D
2
Explanation.
V.R = (1)/sin = (1)/sin 30 = (1)/(1)/2 = 2

Correct Option:
D
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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

Correct Option:
C
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Question 9
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.
Work done on a stretched cord
= Average force x extension
= (10 + 0)/2 x 1.2 x 10-2
= 6.0 x 10-2J

Correct Option:
A
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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

Correct Option:
B

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