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प्रश्न
Fill in the blanks using the words given in the box.
| ignition | petrol | combustion | calorific value | combustible | combustible |
Ignition temperature of ______ is lower than that of wood.
उत्तर
Ignition temperature of petrol is lower than that of wood.
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संबंधित प्रश्न
List conditions under which combustion can take place.
True or False – If False give the correct answer
Oxygen is necessary for combustion
What is ignition temperature?
The substance expected to have the highest ignition temperature out of the following is
Some words (underlined) in the following sentence is jumbled up. Write them in their correct form.
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ficalroic value.
Match the items of Column A with the items of Column B.
| Column A | Column B |
| (a) Oxides of sulphur and nitrogen | (i) fire extinguisher |
| (b) CNG | (ii) incomplete combustion of coal |
| (c) Oxygen | (iii) very low ignition temperature |
| (d) inflammable substance | (iv) acid rain |
| (e) carbon dioxide | (v) necessary for combustion |
| (f) carbon monoxide | (vi) fuel for automobiles |
People usually keep angithi/burning coal in their closed rooms during winter season. Why is it advised to keep the door open?
Write True/False against the following statement and also correct the false statement.
Increased concentration of nitrogen in air is believed to cause global warming.
Complete the crossword with the help of the clues.
Across
1. Non-metal which catches fire if exposed to air. (10)
3. The lowest temperature at which a substance catches fire is called its ______ temperature. (8)
5. The most common fire extinguisher. (5)
Down
2. A chemical process in which a substance reacts with oxygen to give off heat. (10)
4. Petrol is used as a ______ in automobiles. (4)
6. It is as hard as stone and black in colour. (4)
Fill in the blanks using the words given in the box.
| ignition | petrol | combustion | calorific value | combustible | combustible |
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its ______.
