Factors Supporting Combustion

Q. What is combustion?

Q.

Why does oxygen support combustion ?

Q. Process of combustion is a chemical change.

1. True
2. False

Q.

What is the meaning of combustion?

Q. is not the part of the fire triangle.

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

Q.

Which of the following should be done to control fire?

1. Reduce the heat supply

2. Increase the oxygen supply

3. Reduce the nitrogen supply

4. Increase fuel supply

Q. What do you mean by combution. Explain with example.

Q. is not the part of the fire triangle.

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

Q.

Why oxygen is not combustible?

Q.

The essential(s) for combustion is (are)

1. a combustible material

2. the presence of oxygen

3. ignition temperature of the substance

4. All of the above

Q. Combustion can be defined as:

1. a process in which a substance combines with oxygen to produce light only.
2. a process in which a substance combines with oxygen and carbon dioxide to produce heat.
3. a process in which a substance combines with oxygen to produce heat and light.
4. a process in which a substance combines with oxygen and carbon dioxide to produce heat and light.

Q. Which of the following is not necessary for combustion to take place?

1. Oxygen
2. Fuel
3. Carbon dioxide
4. Heat

Q.

Give three essential conditions for combustion.

Q. Why does combustion require oxygen and not someother gases

Q. Which amongst the following fuels will burn at 100${}^0\text{C}$?

1. Fuel -A, Ignition temperature-${\text{110}}^0\text{C}$
2. Fuel -B, Ignition temperature-${\text{98}}^0\text{C}$
3. Fuel -C, Ignition temperature-${\text{85}}^0\text{C}$
4. Fuel -D, Ignition temperature-${\text{120}}^0\text{C}$

Q. Which of the following is not necessary for combustion to take place?

1. Fuel
2. Carbon dioxide
3. Oxygen
4. Heat

Q. Which component of air is commonly used in fire extinguishers and why?

Q.

Which of the following gases supports burning .

1. Nitrogen

2. Carbon dioxide

3. Oxygen

4. Water vapour

Q. Which of the following is not necessary for combustion to take place?

1. Carbon dioxide
2. Heat
3. Fuel
4. Oxygen

Q.

What is fire and how is it different from air, water and 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 wind
2. Absence of sunlight
3. Absence of oxygen
4. Absence of carbon dioxide

Q. When a burning candle is covered with an inverted lid, the flame goes off after some time. This is because of:

1. the absence of carbon monoxide.
2. the absence of carbon dioxide.
3. the absence of oxygen.
4. the absence of water vapours.

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

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

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

Q. Which of the following is not necessary for combustion to take place?

1. Oxygen
2. Fuel
3. Carbon dioxide
4. Heat