McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
| 1. |
A chemical process in which a substance reacts with oxygen to give off heat is called |
| A. | Conduction |
| B. | Conjunction |
| C. | Combustion |
| D. | Confusion |
| Answer» C. Combustion | |
| 2. |
Fuel may be |
| A. | Solid only |
| B. | Solid,Liquid or gas |
| C. | Liquid only |
| D. | Gas only |
| Answer» B. Solid,Liquid or gas | |
| 3. |
The amount of heat energy produced on complete combustion of_____ fuel is called its calorific value. |
| A. | 1 litre |
| B. | 1 Kg |
| C. | 1 milli litre |
| D. | 1 gram |
| Answer» B. 1 Kg | |
| 4. |
The substances which have very low ignition temperature and can easily catch fire with a flame are called |
| A. | inflammable substances |
| B. | Flaming substance |
| C. | Fire proof substance |
| D. | None of the above |
| Answer» A. inflammable substances | |
| 5. |
When we heat water in a paper bowl over a candle, the paper does not catch fire because |
| A. | Paper is not inflamable |
| B. | Paper gets wet |
| C. | Due to water the ignition temperature of paper is not reached |
| D. | This is not possible |
| Answer» C. Due to water the ignition temperature of paper is not reached | |
| 6. |
When oil or petrol catches fire, water is not used to extinguish it because |
| A. | Water covers oil and oil burns under water layer which may not be noticeable |
| B. | Water is heavier than oil / petrol and so remains below the oil layer which continues to burn |
| C. | Water get mixed with oil and increases fire |
| D. | Water gets evaporated |
| Answer» B. Water is heavier than oil / petrol and so remains below the oil layer which continues to burn | |
| 7. |
In combustion |
| A. | Both heat and light is produced |
| B. | Only heat is produced |
| C. | Only light is produced |
| D. | All are correct |
| Answer» A. Both heat and light is produced | |
| 8. |
A person caught fire on clothes is wrapped with blanket because |
| A. | The person suddenly feels cold |
| B. | To hide the burnt body parts |
| C. | The person’s clothes gets burnt |
| D. | To reduce air supply and put fire off |
| Answer» B. To hide the burnt body parts | |
| 9. |
Ignition temperature is |
| A. | The maximum temperature at which a substance catches fire |
| B. | The minimum temperature at which a substance catches fire |
| C. | The temperature of burning substance |
| D. | The temperature in the substance when |
| Answer» B. The minimum temperature at which a substance catches fire | |
| 10. |
Explosion takes place because of |
| A. | Release of large amount of gas under pressure due to sudden reaction |
| B. | Release of large amount of heat |
| C. | Release of large amount of light |
| D. | None of the above |
| Answer» A. Release of large amount of gas under pressure due to sudden reaction | |
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