1
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
300 J of work is done in sliding a 2 kg block up an inclined plane of height 10 m. Work done against friction is (Take g = 10 m/s2)
A
1000 J
B
200 J
C
100 J
D
zero
2
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
A body of mass 3 kg is under a constant force which causes a displacement s in metres in it, given by the relation s = $${1 \over 3}$$t2, where t is in seconds. Work done by the force in 2 seconds is
A
$${{19} \over 5}J$$
B
$${5 \over {19}}J$$
C
$${3 \over {8}}J$$
D
$${8 \over {3}}J$$
3
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm the potential energy stored in it is
A
U/4
B
4U
C
8U
D
16U
4
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
A uniform rod AB of length $$l$$ and mass m is free to rotate about point A. The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about A is ml2/3, the initial angular acceleration of the rod will be

A
$${{mgl} \over 2}$$
B
$${3 \over 2}gl$$
C
$${{3g} \over {2l}}$$
D
$${{2g} \over {3l}}$$
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