Question

A. Tick () the correct answer.
1. Which gas is produced when most of the fuels are burnt?
a. Sulphur dioxide b. Helium
c. Nitrogen
d. Carbon dioxide
2. Which gas is the supporter of combustion?
a. Oxygen
b. Hydrogen
c. Nitrogen
d. Carbon dioxide
3. Water cannot be used to put off fire caused by which of the following substances?
a. Kerosene
b. Petrol
c. Electrical appliance d. All of these
4. Which of the following substance does not burn with a flame?
a. LPG
b. Wood
c. Coal
d. Candle
5. Which among the following substances undergo spontaneous combustion?
a. Firecracker
b. Magnesium ribbon c. Sodium
d. LPG
6. Which is the hottest zone of a candle flame?
a. Innermost zone b. Middle zone C. Outermost zone d. All of these
7. In which part of the candle flame does complete combustion take place?
a. Innermost zone
b. Middle zone c. Outermost zone d. All of these
8. Which fuel has the highest calorific value?
a. Methane
b. LPG
C. Petrol
d. Hydrogen
9. Soot is made up of which of the following?
a. Un-burnt carbon particles
b. Carbon dioxide
c. Carbon monoxide
d. None of these
10. Which among the following is a constituent of natural gas?
a, Methane
b. Ethane
c. Propane
d. Butane​

Answer 1

Answer:

1 ans Carbon dioxide

2 ans oxygen

3 ans All of these

4 ans LPG

5 ans Sodium

6 ans Innermost zone

7 ans All of these

8 ans LPG

9 ans . Un-burnt carbon particles

10 ans thane

Explanation:

hope it helps you

thanku