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WorksheetsCOMBUSTION AND FLAME
Total questions: 10
Worksheet time: 3hrs 30mins
The hottest zone of a candle flame is
Non-luminous zone
Luminous zone
dark zone
blue zone at the base of the wick.
Which poisonous gas is formed as a result of incomplete combustion?
Coal gas
carbon monoxide
carbon dioxide
nitrogen oxide
Good fuels have
low ignition temperature and high calorific value
high ignition temperature and high calorific value
low ignition temperature and low calorific value
high ignition temperature and low calorific value
Which one of the following gases is used in combustion?
CO
Carbon dioxide
Oxygen
Nitrogen
A temperature at which the substance burns is called
melting
boiling temperature
ignition temperature
evaporation
Why is the innermost zone of a flame black in colour?
What are the characteristics of good fuel? (Write any 4)
How does Carbon dioxide extinguish fire?
All combustible substances must be heated to the same temperature to make them burn. True or false?
What is the SI unit of calorific value?
