CBSE
Multiple Choice QuestionsA sphere of diameter 0.2 m and mass 2 kg is rolling on an inclined plane with velocity v = 0.5 m/s. The kinetic energy of the sphere is :
0.1 J
0.3 J
0.5 J
0.42 J
A sphere rolls down an inclined plane of inclination θ. What is the acceleration as the sphere reaches the bottom?
In a bicycle, the radius of rear wheel is twice the radius of front wheel. If rf and rr are the radii, vf and vr are the speeds of topmost points of the wheel, then:
vr = 2vf
vf = 2vr
vr = vf
vf > vr
Moment of inertia of an object does not depend upon :
mass of the object
mass distribution
angular velocity
axis of rotation
Two spherical shells one which is placed in air has constant charge Q; and the other which is placed in a medium of dielectric constant K has a charge Q; The ratio of forces between the shell is:
K : 1
1 : K
K2 : 1
1 : K2
The mass of a solid sphere is 2 kg and radius is 10 cm. Sphere, tied to one end of 1 m long string, is rotated at a rate of 10 rad/sec. The rotational kinetic energy of sphere is :
121.4 J
18.5 J
15.2 J
22.0 J
In the rotational motion, different particles of the body have :
both linear and angular velocities equal
linear velocities equal but different angular velocities
angular velocities equal but different linear velocities
both linear and angular velocity different
The moment of inertia of a ring about one of its diameter is I. What will be its moment of inertia about a tangent parallel to the diameter?
I
2 I
I
3 I
A disc, initially at rest, starts rotating about its own axis, with a constant angular acceleration of 0.2 rad/s2. The time taken by the disc to rotate by 10 rad is (in second)
7.07
10
14.14
100
A disc of a siren containing 60 holes rotates at a constant speed of 360 rpm. The emitted sound is in unison with a tuning fork of frequency
10 Hz
360 Hz
216 Hz
60 Hz
