set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

The process used for transforming salty water into pure water is called

a) Reverse osmosis

b) Electric separation

c) Deliquescence

d) Efflorescence

Question : 2

What is the approximate percentage of Nitrogen present in the atmosphere?

a) 18-20%

b) 40-42%

c) 10-11%

d) 78-79%

Question : 3

Statement (A):
Galvanized iron does not rust.
Statement (R):
Zinc has the efficiency of oxidation.

a) (A) is false, but (R) is true

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

Question : 4

Easily soluble in water

a) Nitrogen

b) Ammonia

c) Carbon

d) Iodine

Question : 5

Graphite was in news recently. What is its importance?

1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as conducting electrodes required for touch screens, LCD’s and organic LED’s.

a) 1, 2, 3 and 4

b) 1 and 2

c) 3 and 4

d) 1, 2 and 4

Question : 6

Match List-I with List-II:

a) 2 1 4 3

b) 1 2 3 4

c) 1 2 4 3

d) 2 1 3 4