set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

Easily soluble in water

a) Nitrogen

b) Ammonia

c) Carbon

d) Iodine

Question : 3

To make the steel hard requires increase in

a) The quantity of Chromium

b) The quantity of Silicon

c) The quantity of Carbon

d) The quantity of Manganese

Question : 4

For the ceiling of diamonds, the unit of weight is carat. One carat is equal to

a) 400 mg

b) 100 mg

c) 200 mg

d) 300 mg

Question : 5

Out of the following which is not an alloy?

a) Copper

b) Bronze

c) Steel

d) Brass

Question : 6

By which process, Alum cleans the muddy water?

a) Dialysis

b) Coagulation

c) Absorption

d) Adsorption