3821: A father is now three times as old as his son. Five years back, he was four times as old as his son. The age of the son is
(a) 12 years
(b) 15 years
(c) 18 years
(d) 20 years
3822: The basic reason for the extraordinary sparkle of a suitably cut diamond is that
(a) it has a very high transparency
(b) it has a very high refractive index
(c) it is very hard
(d) it has well-defined cleavage planes
3823: Unemployment which occurs when workers move from one job to another job is known as
(a) Seasonal unemployment
(b) Frictional unemployment
(c) Technological unemployment
(d) Cyclical unemployment
3824: Assertions (A) :
A mixture of salt and ice gives temperature below 0°C.
Reason (R) :
The salt raises the freezing point of ice.
In the context of the above two statements, which one of the following is correct?
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and Rare true but R is NOT the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
3825: The first Civil Disobedience Movement was started by Gandhiji after the:
(a) Rowlatt Act of 1919
(b) Jallianwala Bagh massacre in 1919
(c) Chauri Chaura incident in 1922
(d) Arrival of Cripps Mission in 1942