Question : Dry ice is

Option 1: Solid ammonia

Option 2: Solid sulphur dioxide

Option 3: Dry carbon dioxide

Option 4: Solid carbon dioxide

Question : Which of the following is a tough, porous, black substance and an almost pure form of carbon?

Option 1: Coke

Option 2: Bitumen

Option 3: Coal tar

Option 4: Coal gas

Question : Silicon is a:

Option 1: semiconductor

Option 2: insulator

Option 3: non-conductor

Option 4: carbon dioxide

Question : Which one out of the following helps in burning?

Option 1: Oxygen

Option 2: Carbon monoxide

Option 3: Nitrogen

Option 4: Carbon dioxide

Question : The carbon dioxide content in the air that we exhale is about

Option 1: 4 %

Option 2: 8 %

Option 3: 12 %

Option 4: 16 %