Factors Supporting Combustion

Q. White phosphorus burns spontaneously in air.

1. True
2. False

Q.

Which of these are inflammable substances?

A. Hydrogen B. Phosphorus

C. Water D. Coke

1. A, B and D
2. A and D
3. Only A
4. A and C

Q. Match the following types of combustion with the correct image

1. Rapid combustion
2. Spontaneous combustion
3. Explosion

Q.

Explain why ${\mathrm{N}}_2\mathrm{O}$ supports combustion more vigorously than air.

Q. An astronaut on the moon takes out a paper and uses a magnifying lens to focus sunlight on the paper. The paper does not catch fire. What can be reason for this occurence?

1. Absence of oxygen
2. Absence of carbon dioxide
3. Absence of wind
4. Absence of sunlight

Q. is necessary for combustion to occur.

1. Air
2. Wax
3. Water

Q.

Fuel A and Fuel B are mixed. Ignition temperature of A is lower then room temperature and that of B is about ${50}^{\circ }$C. What will burn?

1. Mixture

2. No burning

3. Fuel A

4. Fuel B

Q.

A name obtained when the evolution of heat and light takes place is called --------------------- flame.

Q.

Flame is the ___________and _______ part of the fire.

Q.

Which of the following flames is produced by a candle?

1. Blue flame

2. Non-luminous flame

3. Light giving flame

4. Yellow luminous flame

Q. What kind of combustion is undergone by ignition of a cracker?

1. all of these
2. slow combustion
3. explosive combustion
4. spontaneous combustion

Q. Which among the following factors increases the intensity of fire?

1. Fuel supply is increased
2. Fuel supply is decreased
3. Oxygen supply is increased
4. Oxygen supply is decreased

Q. The picture below shows two cases in which a person is trying to burn the paper cup. In case 1, the cup is filled with water and in case 2, it is empty and dry. Which of the following statements is true about this activity?

1. Case 1 catches fire
2. Case 2 catches fire
3. Case 1 does not catch fire
4. Case 2 does not catch fire

Q. Which of the following is not a component of a fire triangle?

1. Heat
2. Oxygen
3. Nitrogen
4. Fuel