1
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
The instantaneous angular position of a point on a rotating wheel is given by the equation $$\theta \left( t \right) = 2{t^3} - 6{t^2}$$

The torque on the wheel becomes zero at
A
t = 1 s
B
t = 0.5 s
C
t = 0.25 s
D
t = 2 s
2
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
The moment of inertia of a thin uniform rod of mass M and length L about an axis passing through its midpoint and perpendicular to its length is $$I$$0. Its moment of inertia about an axis passing through one of its ends and perpendicular to its length is
A
$${I_0} + M{L^2}/2$$
B
$${I_0} + M{L^2}/4$$
C
$${I_0} + 2M{L^2}$$
D
$${I_0} + M{L^2}$$
3
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
A planet moving along an elliptical orbit is closest to the sun at a distance r1 and farthest away at a distance of r2. If $$v$$1 and $$v$$2 are the linear velocities at these points respectively, then the ratio $${{{v_1}} \over {{v_2}}}$$ is
A
(r1 /r2)2
B
r2/r1
C
(r2/r1)2
D
r1/r2
4
AIPMT 2011 Prelims
MCQ (Single Correct Answer)
+4
-1
During an isothermal expansion, a confined ideal gas does $$-$$ 150 J of work against its surroundings. This implies that
A
150 J of heat has been removed from the gas
B
300 J of heat has been added to the gas
C
no heat is transferred because the process is isothermal
D
150 J of heat has been added to the gas
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