A beam of light travelling in air enters into a liquid. Its speed reduces by 30%. The refractive index of liquid with respect to air is 

(a) 
10/7 
(b) 
10/3 
(c) 
7/5 
(d) 
4/3 
A beam of light travelling in air enters into a liquid. Its speed reduces by 30%. The refractive index of liquid with respect to air is 

(a) 
10/7 
(b) 
10/3 
(c) 
7/5 
(d) 
4/3 
A uniform disc rolls without slipping on a rough horizontal surface with uniform angular velocity. Point is the centre of disc and is a point on disc as shown in Figure. In each situation oc column I a statement is given and the corresponding results are given in Column II. Match the statements in Column I with the results in Column II
ColumnI 
Column II 

(A) 
The velocity of point on the disc 
(p) 
Changes in magnitude with time 

(B) 
The acceleration of point on the disc 
(q) 
Always directed from that point (the point on disc given in column I) towards the centre of disc 

(C) 
The tangential acceleration of point on the disc 
(r) 
Is always zero 

(D) 
The acceleration of the point on the disc which is in constant with rough horizontal surface 
(s) 
Is nonzero and remains constant in magnitude 

CODES : 


A 
B 
C 
D 



a) 
C 
a 
b,d 
a 



b) 
a 
b,d 
a 
b,d 



c) 
c 
a 
b 
d 



d) 
d 
c 
a 
b 


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