Question

if you cover a burning kerosene lamp with a jar will it also stop giving light it after sometime justify your answer​

Answer 1

Answer:

Explanation:

Question. 1 A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance?

(a) Iron nail (b) Glass (c) Stone piece (d) Wood

Answer. (d) Wood is a combustible substance. It is a solid fuel and produces smoke during combustion.

Question. 2 Which one of the following has the highest calorific value?

(a) Kerosene (b) Big gas (c) LPG (d) Petrol

Answer. (c) LPG has the highest calorific value, i.e. 55000 kJ/kg.

It means that if 1 kg of LPG is burnt completely, then it will produce 55000 kilojoules of heat energy.

Note

Calorific value

45000 kJ/kg 35000 to 40000 kJ/kg 45000 kJ/kg

Answer 2

Explanation:

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