Systems Of Particles And Rotational Motion

Physics
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A particle is moving along a fixed circular orbit with uniform speed. Then the correct statement among the following is:

A
Angular momentum of particle is constant only in magnitude but its direction changes from point to point
B
Angular momentum of particle is constant only in direction but its magnitude changes from point to point
C
Angular momentum of particle is constant both in magnitude and direction
D
Angular momentum of particle is not constant both in magnitude and direction
Easy
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The centre of a mass of a rigid body lies

A
inside the body
B
outside the body
C
neither nor
D
either or
Easy
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If the resultant of all external forces is zero, then velocity of centre of mass will be

A
zero
B
constant
C
either or
D
neither nor
Easy
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When the velocity of a body is doubled

A
kinetic energy is doubled
B
acceleration is doubled.
C
momentum is doubled.
D
potential energy is doubled.
Easy
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The motion of centre of mass depends on 

A
total external forces
B
total internal forces
C
sum of and
D
None of these
Easy
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Which of the following pairs of physical quantities are not analogous to each other in case of translatory motion and rotational motion, 

A
force, torque
B
mass, moment of inertia
C
couple, torque
D
linear momentum, angular momentum
Easy
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