1
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
A small mass attached to a string rotates on a frictionless table top as shown. If the tension in the string is increased by pulling the string causing the radius of the circular motion to decrease by a factor of 2, the kinetic energy of the mass will

AIPMT 2011 Mains Physics - Rotational Motion Question 58 English
A
decrease by a factor of 2
B
remain constant
C
increase by a factor of 2
D
increase by a factor of 4
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
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
4
AIPMT 2010 Mains
MCQ (Single Correct Answer)
+4
-1
A thin circular ring of mass M and radius r is rotating about its axis with constant angular velocity $$\omega $$. Two objects each of msass m are attached gently to the opposite ends of a diameter of the ring. The ring now rotates with angular velocity given by
A
$${{\left( {M + 2m} \right)\omega } \over {2m}}$$
B
$${{2M\omega } \over {M + 2m}}$$
C
$${{\left( {M + 2m} \right)\omega } \over M}$$
D
$${{M\omega } \over {M + 2m}}$$
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