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CBSE
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MCQ Questions for CBSE Class 12 with Answers
MCQ Questions for CBSE Class 11 with Answers
MCQ Questions for CBSE Class 10 with Answers
MCQ Questions for CBSE Class 9 with Answers
MCQ Questions for CBSE Class 8 with Answers
MCQ Questions for CBSE Class 7 with Answers
MCQ Questions for CBSE Class 6 with Answers
MCQ Questions for CBSE Class 5 with Answers
MCQ Questions for CBSE Class 4 with Answers
MCQ Questions for CBSE Class 3 with Answers
MCQ Questions for CBSE Class 2 with Answers
MCQ Questions for CBSE Class 1 with Answers
Quiz
CBSE
/
Class 11
/
Physics
/
System of Particles and Rotational Motion
1.
A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same, which one of the following will not be affected?
Moment of inertia
Angular momentum
Angular velocity
Rotational kinetic energy
2.
A particle moves on a circular path with decreasing speed. Choose the correct statement.
Angular momentum remains constant.
Acceleration is towards the centre.
Particle moves on a spiral path with decreasing radius.
The direction of angular momentum remains constant.
3.
A body of M.I. 3 kg m² rotating with an angular velocity 2 rad/s has the same K.E. as a mass of 12 kg moving with a velocity of
1 m/s
2 m/s
4 m/s
8 m/s
4.
A hollow cylinder and a solid cylinder having different mass diameter are released from rest simultaneously from the of an inclined plane. Which will reach the bottom first?
solid cylinder
cant be determined without knowing their masses
hollow cylinder
cant be determined without knowing their diameters
5.
Which is the wrong relation from the following?
t = I a
F = ma
L = I w
I = t a
6.
If I, a and t are the moment of inertia, angular acceleration and torque respectively of a body rotating about any axis with angular velocity w, then
t = Ia
t = Iw
I = tw
a = Iw
7.
A dancer on ice spins faster when she folds here arms. This is due to
Increases in energy and increase in angular momentum
Decrease in friction at the skates
Constant angular momentum and increase in kinetic energy
Increase in energy an decreases in angular momentum
8.
The moment of inertia of a uniform semicircular disc of mass M and radius about a line perpendicular to the plane of the disc through the centre is
(2/5) Mr²
(1/4) Mr power 2
(1/2) Mr²
Mr²
9.
A particle moves for 20 s with velocity 3 m/s and then moves with velocity 4 m/s for another 20 s and finally moves with velocity 5 m/s for next 20 s. what is the average velocity of the particle?
3 m/s
4 m/s
5 m/s
Zero
10.
For increasing the angular velocity of an object by 10%, the kinetic energy has to be increased by
40%
20%
10%
21%
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