CBSE
Multiple Choice QuestionsGiven that force N acts on a particle at position m. Find torque of this force on the particle about origin.
A dipole of dipole moment 'p' is placed in non-uniform electric field along x-axis. Electric field is increasing at the rate of 1 V m-1 then the force on dipole is
0
2p
p/2
p
Calculate the heat emitted by a bulb of 100 W in 1 min.
100 J
1000 J
600 J
6000 J
What is the moment of inertia for a solid sphere w.r.t. a tangent touching to its surface?
2/5 MR2
7/5 MR2
2/3 MR2
5/3 MR2
Dimensional formula of angular momentum is
[ M L2 T-1 ]
[ M2 L2 T-2 ]
[ M L2 T-3 ]
[ M L T-1 ]
A solid cylinder, a circular disc, a solid sphere and a hollow cylinder of the same radius are placed on an inclined plane. Which of the following will have maximum acceleration at the bottom of the plane?
Circular disc
Solid cylinder
Solid sphere
Hollow cylinder
If 2 kg mass is rotating on a circular path of radius 0.8 m with angular velocity of 44 rad/sec. If radius of the path becomes 1 m, ther what will be the value of angular velocity?
28.16 rad/sec
19.28 rad/sec
8.12 rad/sec
35.26 rad/sec
Relation between magnetic moment and angular velocity is
M ∝ ω
M ∝ ω2
M ∝
None of these
Assertion: Moment of inertia is always constant.
Reason: Angular moment is conserved that is why moment of inertia is constant.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: Centre of mass of a system does not move under the action of internal forces.
Reason: Internal forces are non conservative forces.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
