3131: Total internal reflection occurs when light travels from:
(a) A rarer medium to a denser medium
(b) A denser medium to a rarer medium
(c) A rarer medium to a denser medium and the angle of incidence is less than the critical angle
(d) A rarer medium to a denser medium and the angle of incidence is greater than the critical angle
3132: Assertion (A) :
A man standing on a completely friction-less surface can propel himself by whistling.
Reason (R) :
If no external force acts on a system, its momentum cannot change.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
3133: Where were the Ghadar revolutionaries, who became active during the outbreak of the World War I based?
(a) South America
(b) North America
(c) Central America
(d) West America
3134: Capital Account Convertibility of the Indian Rupee implies
(a) that the Indian Rupee can be exchanged by the authorised dealers for travel
(b) that the Indian Rupee can be exchanged for any major currency for the purpose of trade in goods and services
(c) that the Indian Rupee can be exchanged for any major currency for the purpose of trading financial assets
(d) None of the above
3135: Who inscribed the name of Khalifa of Baghdad on his coins?
(a) Alauddin Khilji
(b) Iltutmish
(c) Qutub-ud-din
(d) Balban