Chemistry MCQs

Question 1

In arc welding, Argon is used because of its

Accepted Answer

Low reactivity with metal

Answer

Ability to lower the melting point of the metal

Answer

High flammability

Answer

High calorific value

Question 2

An inert gas mixed with oxygen given to patients suffering from restricted breathing is

Accepted Answer

Helium

Answer

Krypton

Answer

Radon

Answer

Argon

Question 3

Which of the following elements is obtained from seaweeds ?

Accepted Answer

Iodine

Answer

Vanadium

Answer

Argon

Answer

Sulphur

Question 4

Silica gel is a

Accepted Answer

Drying agent

Answer

Moisturizer

Answer

Flavouring agent

Answer

Delicious food

Question 5

Silicon is a

Accepted Answer

Semiconductor

Answer

Insulator

Answer

Non-conductor

Answer

Conductor

Question 6

Silicon is used in

Accepted Answer

All of these

Answer

Solar energy devices

Answer

Semiconductors

Answer

Transistors

Question 7

Which of the inert gases can form compounds?

Accepted Answer

Xenon

Answer

Helium

Answer

Krypton

Answer

Argon

Question 8

Vulcanized rubber contains sulphur

Accepted Answer

3-5%

Answer

2%

Answer

7-9%

Answer

10-15%

Question 9

Which of the following alloy is used in making magnet ?

Accepted Answer

Alnico

Answer

Duralumin

Answer

Stainless steel

Answer

Magnalium