Question

C. SE
d. Marble
a Coal gas
A. Choose the correct answer.
1. Which of the following is a combustible substance?
a. Brick
b. Cotton cloth c. Cement
2.
Which poisonous gas is formed as a result of incomplete combustion?
b. Carbon monoxide
c. Carbon dioxide
d. Nitrogen dioxide
3. Which of the following method can be used to extinguish a flame?
a. Reduce temperature to below ignition temperature
b. Remove combustible substance
c. Cut off air supply
d. All of them
4. Which of the following is not a primary fuel?
a. Animal dung b. Charcoal c. Wood
d. Coal
5. What is the colour of a luminous flame?
a. Blue
b. Black
c. Yellow
d. Red
Which of these can be used in case of an electric fire?
a. Water
b. Soda-acid fire extinguisher
c. Carbon dioxide fire extinguisher d. Sand
7. An ideal fuel must have
a. moderate ignition temperature b. low calorific value
c very high ignition temperature d. strong odour
8. Acid rain contains
a. oxides of carbon
b. oxides of sulphur
c. oxides of nitrogen
d. both (b) and (c)
the blanks
1:​

Answer 1

Answer:

2-Carbon monoxide

3-remove combustible substance

4-charcoal

6-carbon dioxide fire extinguisher

Answer 2

Answer:

A.

1. b Cotton cloth

2. b Carbon monoxide

3. d All of them

4. d Coal

5. c Yellow

6. d Sand

7. a moderate ignition temperature

8. both (b) and (c)