1
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
$${{2g} \over {3l}}$$
2
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
3
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
4
AIPMT 2006
MCQ (Single Correct Answer)
+4
-1
The moment of inertia of a uniform circular disc of radius R and mass M about an axis touching the disc at its diameter and normal to the disc
A
$${1 \over 2}$$MR2
B
MR2
C
$${2 \over 5}M{R^2}$$
D
$${3 \over 2}M{R^2}$$