Advertisements
Advertisements
प्रश्न
Fill in the blanks using the words given in the box.
| ignition | petrol | combustion | calorific value | combustible | combustible |
The substances which have very low ______ temperature and can easily catch fire with a flame are called ______ substances.
उत्तर
The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances.
APPEARS IN
संबंधित प्रश्न
Combustion is a chemical reaction in which and substance react with ______.
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.
Slaags is a non-combustible material.
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.
Two glass jars A and B are filled with carbon dioxide and oxygen gases respectively. In each jar, a lighted candle is placed simultaneously. In which jar, will the candle remain lighted for a longer time and why?
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 |
Write True/False against the following statement and also correct the false statement.
A physical process in which a substance reacts with oxygen to give off heat is called combustion.
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)
Any reaction that involves reaction with oxygen is called reaction ______.
Complete combustion of the fuel takes place and the colour of the flame is yellow and is the hottest part of the flame.
