Assume sufficient friction to prevent slipping 
ColumnI 
Column II 

(A) 
(p) 
Body accelerates forward 

(B) 
(q) 
Rotation about the centre of mass is clockwise 

(C) 
(r) 
Friction force acts backward 

(D) 
(s) 
No friction acts 

CODES : 


A 
B 
C 
D 



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



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



c) 
c 
d 
b 
a 



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


Assume sufficient friction to prevent slipping 
ColumnI 
Column II 

(A) 
(p) 
Body accelerates forward 

(B) 
(q) 
Rotation about the centre of mass is clockwise 

(C) 
(r) 
Friction force acts backward 

(D) 
(s) 
No friction acts 

CODES : 


A 
B 
C 
D 



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



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



c) 
c 
d 
b 
a 



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


(b)
Solve to get
, if
if
So friction will act in the forward direction
if so friction will act in the backward direction. Also solved to get
is positive for all cases, hence body will accelerate in the forward direction in all cases
It means will be in the clockwise direction. Hence, bodies will rotate in the clockwise direction
A student has been given a project to prepare an astronomical telescope, she has to select two lenses of type 

(a) 
concave lenses of different focal length 
(b) 
concave lenses of same focal length 
(c) 
convex lenses of different focal length 
(d) 
convex lenses of same focal length 
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