Physics 2008 | Study Mode

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Question 1
A
I and II only
B
I and III only
C
I, II and III only
D
I, III and IV only
Explanation
Torque has the same unit as moment = Nm
i, iii and iv have correct units.

Correct option: D
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Question 2
A
altitude
B
acceleration
C
displacement
D
weight
Explanation
Altitude is just a measure of height, regardless of direction.

Correct option: A
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Question 3
A
3.6 ms-1
B
3.77 ms-1
C
4.0 ms-1
D
7.5 ms-1
Explanation
V = wr = 2f r = 2 x (22)/7 x 1 x 0.6
= 3.77ms-1

Correct option: B
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Question 4
A
I and II only
B
I and III only
C
II and III only
D
I, II and III
Explanation

The condition (ii) is a condition for an equilibrium of parallel forces only while conditions (i) and (iii) are correct for both parallel and non- parallel coplanar forces.


Correct option: B
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Question 5
A
0.01 Hz
B
0.04 Hz
C
2.27 Hz
D
3.60 Hz
Explanation
Frequency = (No. of revolutions)/ Time = (90)/25 = 3.6 Hz

Correct option: D
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Question 6
A
h =(u)2/g
B
h = (u)2/4g
C
h = (2u)2/g
D
h = (u)2/2g
Explanation
From V2 = U2 + 2as
O = U 2 - 2gH, since at maximum height H, the final velocity, v = O.
H = (U)2/2g
PE = KE at (1)/2 H = (U)2/2g x (1)/2 = U2 4g

Correct option: B
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Question 7
A
diffusion
B
cohesion
C
adhesion
D
viscosity
Explanation
since currency and finger contain unlike molecules, the force involved is adhesion

Correct option: C
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Question 8
A
25
B
2.5
C
0.5
D
0.25
Explanation
F = (mv)2/r = (100 x 5)2 = 250N
R = mg = 100 x 10 - 1000N
coefficient of friction,
= (F)/R = (250)/1000 = 0.25

Correct option: D
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Question 9
A
0.625 J
B
6.250 J
C
62.500 J
D
625.000 J
Explanation
Energy stored in a spring = (1)/2 K e2 = (1)/2 x 500(0.05)2 = 0.625J

Correct option: A
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Question 10
A
0.8
B
1.1
C
1.2
D
1.3
Explanation
hlpl = hwpw
where, L =liquid and W = water
(pl)/pw = (hw)/hl = (26.5)/20.4
= 1.299

Correct option: D

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