A constant external torque acts for a very brief period on a rotating system having moment of inertia , then 

a) 
The angular momentum of the system will change by 
b) 
The angular velocity of the system will change by 
c) 
If the system was initially at rest, it will acquire rotational kinetic energy 
d) 
The kinetic energy of the system will change by 
A constant external torque acts for a very brief period on a rotating system having moment of inertia , then 

a) 
The angular momentum of the system will change by 
b) 
The angular velocity of the system will change by 
c) 
If the system was initially at rest, it will acquire rotational kinetic energy 
d) 
The kinetic energy of the system will change by 
(a,b,c) Let angular momentum or For constant torque, Or if Rotational kinetic energy 
A solid sphere rolls without slipping on a rough horizontal floor, moving with a speed . It makes an elastic collision with a smooth vertical wall. After impact 

a) 
It will move with a speed initially 
b) 
Its motion will be rolling without slipping 
c) 
Its motion will be rolling without slipping initially and its rotational motion will stop momentarily at some instant 
d) 
Its motion will be rolling without slipping only after some time 
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