Combustion and flame hard

Combustion and Flame Quiz

1. Which of the following gases is not produced during combustion?

a) Nitrogen b) Carbon dioxide c) Oxygen d) Sulphur dioxide

2. What is the ignition temperature?

a) The temperature at which a substance catches fire b) The temperature at which a substance starts melting c) The temperature at which a substance boils d) The temperature at which a substance sublimates

3. Which of the following is an example of a self-sustained combustion process?

a) Burning of paper b) Lighting a matchstick c) Burning of a candle d) Spontaneous combustion of hay

4. Why does a candle flame have three distinct zones?

a) Due to the presence of three different fuels b) Due to different temperature zones c) Due to incomplete combustion d) Due to a chemical reaction

5. Which of the following is a characteristic of a diffusion flame?

a) It is bright blue b) It is non-luminous c) It has high heat content d) It produces no heat

6. Which of the following substances does not support combustion?

a) Oxygen b) Hydrogen c) Charcoal d) LPG (Liquefied Petroleum Gas)

7. What is the main purpose of a safety valve in a pressure cooker?

a) To prevent the pressure cooker from exploding b) To increase the cooking time c) To regulate the temperature d) To reduce the flame

8. What is the main cause of smog formation in cities?

a) Dust particles b) Industrial waste c) Vehicle emissions d) Agricultural activity

9. Which gas is released from the exhaust of vehicles?

a) Nitrogen b) Carbon dioxide c) Oxygen d) Carbon monoxide

10. Which of the following materials undergoes sublimation?

a) Ice b) Wax c) Camphor d) Salt