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Combustion and Flame (Class VIII)

Combustion and Flame

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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following is the ignition temperature of phosphorus?

  1. 35oC
  2. 349oC
  3. 90oC
  4. 445oC
  5. 500oC
Question 2 Multiple Choice (Single Answer)

The electrical fires or fires caused due to burning of oil or petrol are extinguished by using _________ fire extinguisher.

  1. water
  2. dry powder
  3. carbon dioxide gas
  4. wet chemical
  5. None of the above
Question 3 Multiple Choice (Single Answer)

Which of the following chemicals is/are poisonous and no longer used in making the tips of matchsticks these days?

a. White phosphorus
b. Antimony trisulphide
c. Potassium chlorate

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 4 Multiple Choice (Single Answer)

Which of the following materials do(es) not support combustion?

a. Nitrogen
b. Oxygen
c. Noble gases

  1. Only a
  2. Only a and b
  3. Only b
  4. Only a and c
  5. Only c
Question 5 Multiple Choice (Single Answer)

Match the following
a. When a combustible material burns at a slow or moderate rate, it is called 1. spontaneous combustion
b. When a combustible material burns quickly to produce heat and light, it is called 2. slow combustion
c. When a combustible material suddenly bursts into flames, without the application of apparent cause, it is called 3. rapid combustion
  1. a - 2, b - 1, c - 3
  2. a - 2, b - 3, c - 1
  3. a - 3, b - 2, c - 1
  4. a - 1, b - 2, c - 3
  5. a - 1, b - 3, c - 2
Question 6 Multiple Choice (Single Answer)

Which of the following fuels has the greatest calorific value?

  1. LPG
  2. Diesel
  3. Biogas
  4. Cow-dung cakes
  5. Hydrogen gas
Question 7 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. Spontaneous combustion never takes place at the room temperature.
b. The heat required for spontaneous combustion is produced inside the substance by its slow oxidation.
c. A large amount of gas is released quickly in an explosive combustion.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 8 Multiple Choice (Single Answer)

Which of the following is an example of spontaneous combustion?

  1. The burning of wax in a candle
  2. The burning of coal dust in coal mines
  3. The burning of cooking gas in a gas stove
  4. The exploding of crackers during festivals
  5. The burning of kerosene oil in a kerosene stove
Question 9 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. The materials that produce light energy on burning in air are called fuels.
b. When magnesium is heated in air, it catches fire and burns with a dazzling white flame.
c. On heating, charcoal burns to produce a large amount of heat and a dull red light.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 10 Multiple Choice (Single Answer)

Which of the following methods cannot be used to extinguish fire?

a. By removing the combustibe substances
b. By removing the heat
c. By increasing the supply of air to the burning substances

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 11 Multiple Choice (Single Answer)

Which of the following is not a characteristic of an ideal fuel?

  1. It burns easily in air at a moderate rate.
  2. It has a low calorific value.
  3. It has a proper ignition temperature.
  4. It neither produces any harmful gases nor leaves any residue after burning.
  5. It is cheap, readily available and easy to transport.
Question 12 Multiple Choice (Single Answer)

If the oxygen supply is sufficient, then the fuel burns completely, producing mainly a blue flame. In which of the following cases is a blue flame produced?

a. The burning of LPG in a kitchen gas stove
b. The burning of kerosene in a lamp
c. The burning of a wax candle

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 13 Multiple Choice (Single Answer)

The substances that do not undergo combustion are called non-combustible substances. Which of the following is a non-combustible substance?

  1. Charcoal
  2. Kerosene oil
  3. Alcohol
  4. Copper
  5. Wood
Question 14 Multiple Choice (Single Answer)

Which of the following substances does not burn by producing a flame?

  1. Biogas
  2. Camphor
  3. Magnesium
  4. Mustard oil
  5. Charcoal
Question 15 Multiple Choice (Single Answer)

A few chemicals release carbon dioxide gas, by getting decomposed in the heat of the fire, for extinguishing a fire. Which of the following chemicals cannot be used for this purpose?

a. Baking soda
b. Potassium bicarbonate
c. Citric acid

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 16 Multiple Choice (Single Answer)

Match the following:

 
Zones of a flame Features
a. The innermost zone 1. Blue in colour and the hottest
b. The middle zone 2. Yellow in colour and moderately hot
c. The outer zone 3. Black in colour and the coldest
  1. a - 3, b - 1, c - 2
  2. a - 3, b - 2, c - 1
  3. a - 2, b - 3, c - 1
  4. a - 2, b - 1, c - 3
  5. a - 1, b - 2, c - 3
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