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Combustion and Flame

Combustion And Flame

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Questions

Question 1 Multiple Choice (Single Answer)

When a magnesium ribbon burns, it combines with the oxygen from the air to form _____________, liberating heat and light.

  1. magnesium hydroxide
  2. magnesium oxide
  3. magnesium trioxide
  4. magnesium dioxide
  5. magnesium bicarbonate
Question 2 Multiple Choice (Single Answer)

When charcoal burns, the carbon of the charcoal combines with the oxygen of the air to form

  1. carbon monoxide
  2. carbon dioxide
  3. carbon oxide
  4. carbon disulphide
  5. carbonic acid
Question 3 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. When charcoal burns with the oxygen in the air, a lot of heat, but only a little light is produced.
b. Carbon dioxide is necessary for combustion to take place.
c. Respiration is a kind of slow combustion of food which takes place to produce heat in the body.

  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 substances has the lowest ignition temperature?

  1. Coal
  2. Charcoal
  3. Cow-dung cakes
  4. Wood
  5. LPG
Question 5 Multiple Choice (Single Answer)

Which of the following is/are the conditions necessary for combustion?

a. Presence of a combustible substance.
b. Presence of a supporter of combustion.
c. Heating of the combustible substance to its ignition temperature.

  1. Only a
  2. Only c and b
  3. Only a and c
  4. Only c
  5. All of these
Question 6 Multiple Choice (Single Answer)

The fire produced by ___________ cannot be extinguished by water.

  1. wood
  2. petrol
  3. paper
  4. fabric
  5. plastic
Question 7 Multiple Choice (Single Answer)

Which of the following has the highest ignition temperature?

  1. White phosphorus
  2. Alcohol
  3. Diesel
  4. Biogas
  5. Plastic
Question 8 Multiple Choice (Single Answer)

Which of the following chemicals can be used to extinguish electric fire?

  1. Sulphur
  2. Antimony trisulphide
  3. Potassium bicarbonate
  4. Phosphorus
  5. Washing soda
Question 9 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. A combustible substance cannot catch fire as long as its temperature is higher than its ignition temperature.
b. A supporter of combustion is necessary for the combustion to take place.
c. The lowest temperature at which a substance catches fire and starts burning is called its ignition temperature.

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

Which of the following are used to make the head of matchsticks these days?

a. Antimony trisulphide
b. Potassium chlorate
c. Red phosphorus
d. Brown sulphur

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

Which of the following gas is used to extinguish electric fires?

  1. Oxygen
  2. Nitrogen
  3. Helium
  4. Carbon dioxide
  5. Argon
Question 12 Multiple Choice (Single Answer)

Which of the following is an example of explosive combustion?

  1. Burning of LPG in a gas stove.
  2. Burning of white phosphorus.
  3. Burning of wax in a candle.
  4. Burning of coal dust in coal mines.
  5. Burning of firecrackers during festivals.
Question 13 Multiple Choice (Single Answer)

Which of the following is/are ways to extinguish a fire?

a. By removing the fuel.
b. By removing the heat.
c. By cutting off the air supply to the burning substances.

  1. Only a
  2. Only a and b
  3. Only b and c
  4. Only c
  5. All of these
Question 14 Multiple Choice (Single Answer)

Which of the following is not an example of a solid fuel?

  1. Wood
  2. Alcohol
  3. Charcoal
  4. Coke
  5. Coal
Question 15 Multiple Choice (Single Answer)

Which of the following fuels has the highest calorific value?

  1. Hydrogen gas
  2. Diesel
  3. Petrol
  4. Biogas
  5. Methane
Question 16 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. Dry leaves catch fire easily, but green leaves do not.
b. Coal fires cannot be started easily using a matchstick as coal has a high ignition temperature.
c. The ignition temperature of wood is lower than that of kerosene.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 17 Multiple Choice (Single Answer)

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

  1. Biogas
  2. Camphor
  3. Magnesium
  4. Charcoal
  5. Mustard oil
Question 18 Multiple Choice (Single Answer)

Which of the following statements is/are false?

a. Different types of fuels produce different amounts of heat on burning.
b. When water is thrown on a burning substance it gets cooled below its ignition temperature and stops burning.
c. The amount of heat produced by the burning of one gram of a fuel is called its calorific value.

  1. Only a
  2. Only a and b
  3. Only b
  4. Only b and c
  5. Only c
Question 19 Multiple Choice (Single Answer)

Match the following:
a. Rapid combustion 1. It is a very fast combustion reaction in which a large amount of heat, light and sound are produced.
b. Spontaneous combustion 2. It is a combustion reaction which occurs on its own i.e. without the help of any external heat.
c. Explosive combustion 3. It is a combustion reaction in which a large amount of heat and light are produced in a short time.
  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
Question 20 Multiple Choice (Single Answer)

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

  1. It has a high calorific value.
  2. It burns easily in air at a moderate rate.
  3. It has a very low ignition temperature.
  4. It does not produce any harmful gases or leaves any residue after burning.
  5. It should be cheap, readily available and easy to transport.
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