Chemistry MCQs

Question 1

Piped Natural Gas (PNG) is used for

Accepted Answer

Cooking

Answer

Mining

Answer

Welding

Answer

Anaesthesia

Question 2

Petroleum consists of a mixture of

Accepted Answer

Hydrocarbons

Answer

Carbohydrates

Answer

Carbonates

Answer

Carbides

Question 3

White coal is

Accepted Answer

None of these

Answer

Uranium

Answer

Hydro-electricity

Answer

Diamond

Question 4

Which of the following is the petroleum wax ?

Accepted Answer

Paraffin wax

Answer

Bees wax

Answer

Carnauba wax

Answer

Jojoba wax

Question 5

The hottest part of the gas flame is known as

Accepted Answer

Luminous zone

Answer

Blue zone

Answer

Non-luminous zone

Answer

Dark zone

Question 6

Water is not effective in extinguishing a fire caused by petrol because

Accepted Answer

Water and petrol are immiscible with each other and petrol which forms the upper layer continues to burn

Answer

The flame is too hot for water to cool it down

Answer

Water and petrol react chemically

Answer

Water and petrol are miscible with each other

Question 7

The temperature of oxy-acetylene flame is around

Accepted Answer

4000°C

Answer

2800°C

Answer

3200°C

Answer

3600°C

Question 8

Helium gas is used in gas balloons instead of hydrogen gas because it is

Accepted Answer

Non-combustible

Answer

Lighter than hydrogen

Answer

More abundant than hydrogen

Answer

More stable

Question 9

Sea water can be purified by the process of

Accepted Answer

Distillation

Answer

Evaporation

Answer

Filtration

Answer

Fractional distillation