set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

BOD is connected with

a) organic matter

b) microbes

c) microbes and organic matter

d) None of these

Question : 2

The substance having the largest concentration in acid rain?

a) HNO₃

b) HCl

c) H₂CO₃

d) H₂SO₄

Question : 3

Match List-I with List-II :

a) A – 4, B – 2, C – 1, D – 3

b) A – 1, B – 4, C – 2, D – 3

c) A – 4, B – 1, C – 2, D – 3

d) A – 4, B – 1, C – 3, D – 2

Question : 4

Which of the following best describes “jet streams”?

a) Narrow meandering bands of winds which blow in mid latitude near the tropopause and encircle the globe.

b) Wind blowing from sub tropical high pressure belts towards the tropical low pressure belts.

c) Wind system with seas and reversal of direction.

d) Winds blowing from the tropical high pressure belts towards the equatorial low pressure belts.

Question : 5

What is the reason for white cement to be white?

a) It does not contain iron

b) It does not contain silicon

c) It does not contain carbon

d) It does not contain calcium

Question : 6

Which of the following statements about photochemical smog is wrong?

a) It has low concentration of oxidising agent

b) It can be controlled by controlling the release of NO₂ , hydrocarbons ozone, etc.

c) It has high concentration of oxidising agents

d) Plantation of some plants like pinus helps in controlling photochemical smog.