1531: Helium is used for respiration in deep water instead of nitrogen because:
(a) It is heavier than nitrogen
(b) It is lighter than nitrogen
(c) It mixes less in blood than nitrogen
(d) It helps oxygen burn more quickly
1532: Contour bunding is used:
(a) To stop the winds in sandy deserts
(b) To irrigate desert areas
(c) To prevent erosion in hilly areas
(d) None of the above
1533: Which of the following is true about the Bats?
1. Bats are mammals
2. Bats have wings which are actually the modified forelimbs
3. Bats are nocturnal in habit
(a) 1, 2 & 3
(b) 2 & 3
(c) 1 & 3
(d) 1 & 2
1534: With reference to the period of Indian freedom struggle, which of the following was/were recommended by the Nehru report ?
1. Complete Independence for India.
2. Joint electorates for reservation of seats for minorities.
3. Provision of fundamental rights for the people of India in the Constitution.
Select the correct answer using the codes given below:
(a) 1 only
(b) 1 and 3 only
(c) 2 and 3 only
(d) 1, 2 and 3
1535: 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