F1 SC C7 OUTPUT TEST

__________ gas occupies the major part of composition of air.

• Nitrogen

• Oxygen

• Carbon dioxide

Which gas is released into the atmosphere by plants following photosynthesis?

• Oxygen

• Argon

• Carbon dioxide

• Nitrogen

__________% of nitrogen is present in the atmosphere.

________% of carbon dioxide is present in the atmosphere.

____________% of oxygen is present in the atmosphere.

Which of the following gas helps in burning?

• Nitrogen

• Oxygen

• Carbon dioxide

• Carbon monoxide

What are the users of Oxygen?

(a) Living being

(b) Combustion of fuel

(c) Rusting of iron

(d) All the above

• A

• B

• C

• D

Excessive carbon dioxide will cause：

Pls state one phenomenon

what are the conditions for burning?

*can choose more than 1

• oxygen

• fuel

• water

• heat

Choose materials that classify as fuel

• Glass rod

• Candle

• Stone

• Wood