Question

d. Oxygen
3. Which of the following is produced in incomplete combustion of hydrocarbons?
7. In which of the following cases, water should not be used for extinguishing fire?
B. Choose the correct option.
1. The colour of the flame depends upon:
a. temperature
b. amount of air available
c. nature of the substance burning d. All of these
2. What burns in a candle flame?
a. Solid wax b. Liquid wax
C. Wax vapours
a. Carbon dioxide
b. Carbon monoxide
c. Oxygen
d. Methane
4. Which of the following is a characteristic of an ideal fuel?
a. High calorific value
b. High rate of combustion
c. Low ignition temperature
d. Should cause pollution
5. Which of the following is the main constituent of natural gas?
a. Oxygen b. Petrol
C. Methane
6. Which of the following is an air pollutant?
a. Carbon monoxide
c. Soot particles
d. All of these
d. Carbon dioxide
b. Oxides of nitrogen and sulphur
d. All of these
d. Methane
c. Electrical fire
a. Burning diesel b. Burning petrol
8. Which of the following fuels is considered an ideal fuel for domestic use?
a. Hydrogen b. Petrol
c. Cow dung cakes
9. Which of the following types of coal is used for manufacturing coke?
a. Lignite b. Peat
C. Bituminous coal
10. Which of the following products of petroleum is used in candles, ointments and
Vaseline?
a. Fuel oil
b. Paraffin wax C. Lubricating oil
d. Anthracite
d. Asphalt​

Answer 1

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