Question

B. Fill in the blanks.
1. A blue flame on a burner shows
combustion.
3. Hottest part of a candle flame is its .......... zone.
4. Mined coal and petroleum are .............fuels.
5.
has the highest calorific value
among the fuels.
2. A yellow flame on a burner shows
combustion.
***
C. State whether 'true' or 'false':
1. An iron nail is a combustible substance.
2. Oxygen is essential for combustion.
3. Minimum temperature at which a substance
catches fire is its calorific value.
4. Water and carbon dioxide are fire extinguishers.
5. Yellow flame from a gas burner shows
complete burning of the fuel.
6. Fossil fuels are an inexhaustible natural
resource of fuel.
7. Fire extinguishers should be provided at all
public places.
8. It is the vapour form of fuel that catches flame.
9. Temperature at which a fuel catches fire is
called its ignition temperature.
10. Amount of heat energy produced on
complete combustion of a unit fuel is called
its calorific value.​

Answer 1

Answer:

3-minim

Explanation:

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