Match the entries in Column I with those in Column II 
ColumnI 
Column II 

(A) 
An impulsive force acts at a height on a solid sphere, lying on a rough surface 
(p) 
Momentum is conserved 

(B) 
A small particle of mass moving horizontally collides with a vertical hinged rod inelastically 
(q) 
Angular momentum is conserved 

(C) 
A small particle of massstrikes elastically at the end of a horizontal rod kept on a smooth surface 
(r) 
Energy is conserved 

(D) 
A small particle of mass collides with a vertical rod elastically 
(s) 
Momentum increases 

CODES : 


A 
B 
C 
D 



a) 
D 
b,d 
a,b,c 
b,c,d 



b) 
d 
c 
b 
a 



c) 
b,a 
c,d 
c 
a 



d) 
b,a 
b,c 
d 
a,c 


Match the entries in Column I with those in Column II 
ColumnI 
Column II 

(A) 
An impulsive force acts at a height on a solid sphere, lying on a rough surface 
(p) 
Momentum is conserved 

(B) 
A small particle of mass moving horizontally collides with a vertical hinged rod inelastically 
(q) 
Angular momentum is conserved 

(C) 
A small particle of massstrikes elastically at the end of a horizontal rod kept on a smooth surface 
(r) 
Energy is conserved 

(D) 
A small particle of mass collides with a vertical rod elastically 
(s) 
Momentum increases 

CODES : 


A 
B 
C 
D 



a) 
D 
b,d 
a,b,c 
b,c,d 



b) 
d 
c 
b 
a 



c) 
b,a 
c,d 
c 
a 



d) 
b,a 
b,c 
d 
a,c 


(a)
a. Immediately the sphere will gain velocity, so momentum increases
b. Here angular momentum about the hinged point will remain constant
Applying conservation of angular momentum about
Final momentum,
This is greater than
c. Here no external force or external torque acts. So all remain conserved, as the collision is elastic
d. Here also momentum increases. As the collision is elastic, so energy is also conserved. Angular momentum is conserved about the hinged point