set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Which gas is known as ‘noble gas’?

a) Oxygen

b) Helium

c) Hydrogen

d) Carbon dioxide

Question : 2

Which of the following is not in the form of crystal?

a) Graphite

b) Diamond

c) Quartz

d) Sulphur

Question : 3

Check these statements.

1. Brass is an alloy of Copper and Zinc.
2. Magnetite is the main ore of Aluminium.
3. Mercurius Solubilis are that substance which mainly involves mercury.
4. Potassium Nitrate (KNO3 ) is a chemical used in photography.

a) 1, 3 and 4

b) 2 and 3

c) 1 and 2

d) 1 and 3

Question : 4

Solder used in soldering metal pieces consists of any alloy of

a) Tin, Lead and Zinc

b) Tin, Zinc and Copper

c) Tin and Zinc

d) Tin and Lead

Question : 5

Brass is a combination of what metals?

a) Copper + Zinc and Nickel

b) Copper and Zinc

c) Copper and Nickel

d) Copper and Tin

Question : 6

Which of the following elements is added to iron to produce steel which can resist high temperature, have high hardness and abrasion resistance?

a) Tungsten

b) Nickel

c) Aluminium

d) Chromium