• Combustion and Flame
Back
0

Combustion and Flame

Description: Combustion and Flame - I
Number of Questions: 20
Created by:
Tags: Combustion and Flame - I Combustion, Types of Combustion Flame, Structure of a Flame Fuel, Fuel Efficiency, Harmful Effects on Burning of Fuels Combustion and Flame Concentration of Solution and its Effects on the Cell Structure and Functions of Cell Organelles Fundamental Unit of Life
Start the Quiz
Attempted 0/20 Correct 0 Score 0
‹
›

Which of the following products are formed when magnesium burns in the presence of oxygen?

  1. It produces manganese, light and heat.

  2. It produces magnesium oxide, light and heat.

  3. It produces magnesium dioxide, light and heat.

  4. It produces magnesium oxide and absorbs heat.

Show answer
Correct Option: B
Explanation:

When magnesium burns in the presence of oxygen it produces magnesium oxide, light and heat.

Which is the gas best suitable for extinguishing the fire involving electrical equipments and inflammable materials like petrol?

  1. (O2) oxygen

  2. Nitrogen

  3. Carbon dioxide

  4. Hydrogen

Show answer
Correct Option: C

Which of the following is not an essential requirement for producing fire?

  1. Fuel

  2. Air

  3. Heat

  4. Light

Show answer
Correct Option: D
Explanation:

Light is not an essential condition for combustion to take place. 

Why does a matchstick not catches fire on its own at room temperature?

  1. This is because its ignition temperature is to high to burn.

  2. This is because its ignition temperature is too low to burn.

  3. This is because it never burns in the presence of light and air.

  4. This is because oxygen supply is too low at room temperature.

Show answer
Correct Option: A
Explanation:

A matchstick does not catch fire until its temperature is raised to its ignition temperature and the ignition temperature of this type of substance is higher than room temperature.

Which of the following gas is essential for combustion?

  1. Oxygen

  2. Carbon dioxide

  3. Nitrogen

  4. Hydrogen

Show answer
Correct Option: A
Explanation:

 Oxygen is an essential gas for combustion.

What is the difference between spontaneous combustion and rapid combustion?

  1. In spontaneous combustion, substance suddenly bursts into flames while in rapid combustion, substance burns slowly.

  2. In spontaneous combustion, substance burns rapidly into flames while in rapid combustion, substance burns suddenly in to flames.

  3. In spontaneous combustion, substance burns suddenly into flames and in rapid combustion, substance burns rapidly into flames.

  4. In spontaneous combustion, substance burns slowly but in rapid combustion, substance burns rapidly into flames.

Show answer
Correct Option: C

How does carbon dioxide (CO2) help to put off fire?

  1. CO2 is lighter than oxygen. It covers fire like a blanket and cut off the contact between fuel and oxygen.

  2. CO2 is heavier than oxygen. It covers the fire like a blanket and cut off the contact between the fuel and oxygen.

  3. CO2 mixes with O2 and it changes the nature of oxygen which supports burning into non supporting gas.

  4. Carbon dioxide reacts with oxygen gas and thus changes the nature of oxygen, from supporting gas to non supporting gas.

Show answer
Correct Option: B

Why do substances like wax and kerosene oil burn while flaming flame?

  1. Wax and kerosene oil liquefied during burning and form flame

  2. Wax and kerosene oil vapourise during burning and produce flame.

  3. Flame is produced because kerosene oil and wax have low ignition temperature.

  4. Kerosene oil and wax are combustible substances and every combustible substance always produce flames on burning.

Show answer
Correct Option: B

Why is water not suitable for fire involving oil and petrol?

  1. Because water is lighter than oil and it flows over oil.

  2. Water is heavier than oil and sinks below it.

  3. It mixes with oil and both start burning.

  4. Water increases the ignition temperature of oil.

Show answer
Correct Option: B

Which of the following materials does not produce flame on burning?

  1. Candle

  2. Magnesium

  3. Kerosene stone

  4. Charcoal

Show answer
Correct Option: D

Which of the following fuels has least calorific value?

  1. Cow dung cake

  2. Petrol

  3. L.P.G

  4. Hydrogen

Show answer
Correct Option: A

Which of the following gases produced during burning of coal can cause death of a person if he/she burns coal in a closed room?

  1. Carbon dioxide

  2. Carbon monoxide

  3. Carbon sulphide

  4. Carbon disulphide

Show answer
Correct Option: B

Which of the following is not a zone of flame?

  1. Dark zone

  2. Luminous zone

  3. Combustible zone

  4. Non luminous zone

Show answer
Correct Option: C

Why does charcoal not produce flame on burning?

  1. It vapourises and burns vigorously.

  2. It does not vapourise for producing flame.

  3. It never burns so do not produce flame.

  4. It changes in to liquid state while burning so do not produce flame.

Show answer
Correct Option: B

Why do Goldsmiths use the outermost zone of a flame with metallic blow pipe for melting gold and silver?

  1. It has unburnt carbon particles.

  2. Oxygen supply is less in this zone.

  3. It is the hottest zone.

  4. It has vapours which help in melting gold and silver.

Show answer
Correct Option: C
Explanation:

The outermost zone is the hottest zone of the flame as oxygen is available in sufficient supply and complete combustion takes place here.

Which of the following gases is extremely suffocating and corrosive and is produced by burning of coal and diesel?

  1. Carbon dioxide gas

  2. Sulphur dioxide gas

  3. Nitrogen oxide

  4. Sulphur monoxide gas

Show answer
Correct Option: B

Which of the following is not a property of ideal fuel?

  1. It is cheap.

  2. It produces large amount of heat.

  3. It burns quickly in air.

  4. It does not leave behind any residue and any undesirable substance.

Show answer
Correct Option: C
Explanation:

We should keep in mind that the fuel selected must possess the following characteristic properties:

  1. It should possess high calorific value.
  2. It should have proper ignition temperature.
  3. It should not produce poisonous products during combustion.
  4. It should not burn quickly in air.
  5. Combustion should be easily controllable.
  6. It should not leave behind much ash on combustion.
  7. It should be easily available in plenty.
  8. It should have low moisture content.
  9. It should be cheap and easy to handle and transport. 

What is the colour of middle zone of the flame of candle?

  1. Yellow

  2. Blue

  3. Black

  4. Green

Show answer
Correct Option: A

Why is the flame of L.P.G stove blue in colour?

  1. It is due to incomplete combustion of L.P.G.

  2. It is due to presence of carbon particles.

  3. It is due to presence of dust particles.

  4. It is due to complete combustion of L.P.G.

Show answer
Correct Option: D

In which of the following zones of candle flame, partial combustion takes place?

  1. Luminous zone

  2. Non luminous zone

  3. Combustible zone

  4. Dark zone

Show answer
Correct Option: A
- Hide questions
ADVERTISEMENT

Find more quizzes from top tags

general knowledge
3615 Quizzes
119858 Questions
 technology
307 Quizzes
36705 Questions
 sports
963 Quizzes
19148 Questions
 history
1187 Quizzes
13475 Questions
 physics
598 Quizzes
13441 Questions
 biology
1160 Quizzes
12174 Questions
 science & technology
551 Quizzes
11015 Questions
 chemistry
490 Quizzes
9892 Questions
 maths
518 Quizzes
9324 Questions
 softskills
0 Quizzes
7131 Questions