0 votes
259 views
in Class VIII Science by Expert (68.9k points)

Provide me latest MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame Free PDF Download so I can prepare for exams. Kindly give Chapter 6 Combustion and Flame Class 8 Science MCQs Questions with Answers quickly as it is very essential.

Please log in or register to answer this question.

1 Answer

0 votes
by Expert (50.3k points)

Below you will find MCQ Questions of Chapter 6 Combustion and Flame Class 8 Science Free PDF Download that will help you in gaining good marks in the examinations and also cracking competitive exams. These Class 8 MCQ Questions with answers will widen your skills and understand concepts in a better manner.

MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with Answers

MCQ Questions for Class 8 Science Chapter 6 Combustion and Flame with answers

1. What kind of reaction is combustion?

(a) Reduction

(b) Redox

(c) Substitution

(d) Oxidation

► (d) Oxidation

2. Substance which vaporise during burning forms :

(a) flame

(b) carbon black

(c) residue

(d) all the above

► (a) flame

3. What does the blue zone in an L.P.G. flame indicate?

(a) Unburnt vapours

(b) Partial decomposition

(c) Moderately hot

(d) Hottest zone of complete combustion

► (d) Hottest zone of complete combustion

4. Non combustible substances do not burn in :

(a) air

(b) oxygen

(c) hydrogen

(d) both air and oxygen

► (d) both air and oxygen

5. What is burning of a substance in the presence of air with the evolution of heat called?

(a) Distillation

(b) Carbonization

(c) Combustion

(d) Refining

► (c) Combustion

6. A material that burns is one that can combine quickly with:

(a) hydrogen

(b) oxygen

(c) carbon

(d) water

► (b) oxygen

7. Which of the following is an example of rapid combustion?

(a) Candle

(b) Cracker

(c) White phosphorus

(d) Sulphur

► (a) Candle

8. We can extinguish fire by

(a) removing non combustible substances from surroundings

(b) cutting the supply of oxygen

(c) lowering temperature below ignition temperature

(d) both cutting the supply of oxygen and lowering temperature below ignition temperature

► (d) both cutting the supply of oxygen and lowering temperature below ignition temperature

9. What does natural gas contain?

(a) Methane, ethane, propane.

(b) Butane, propane and ethane.

(c) Pentene, methane and ethylene.

(d) Hexane, butane and ethane.

► (a) Methane, ethane, propane.

10. At its ignition temperature a combustible material:

(a) extinguishes

(b) changes into vapour

(c) evolves oxygen

(d) melts

► (b) changes into vapour

11. When methane burns in air, what are the products formed?

(a) CO2+2H2O+heat

(b) CO2+H2

(c) CO+O2

(d) CO2+O2+heat

► (a) CO2+2H2O+heat

12. The substances which have very low ignition temperature will

(a) catch fire easily

(b) will not catch fire

(c) catch fire after some time

(d) none of the above

► (a) catch fire easily

13. Many harmful gases are produced during :

(a) incomplete combustion

(b) complete combustion

(c) digestion of food

(d) rusting of iron

► (a) incomplete combustion

14. Middle zone of candle flame is also known as zone of :

(a) impartial combustion

(b) complete combustion

(c) smoke free combustion

(d) partial combustion

► (d) partial combustion

15. No external heat is required to start:

(a) simultaneous combustion

(b) spontaneous combustion

(c) splendid combustion

(d) spreading fire combustion

► (b) spontaneous combustion

16. Coal burns with

(a) flame

(b) only glow

(c) both flame and glow

(d) none of the above

► (b) only glow

17. Some substances burn on their own when kept exposed in air for some time for example

(a) Sulphur

(b) Oxygen

(c) Phosphorus

(d) Carbon

► (c) Phosphorus

18. How is synthetic petrol produced?

(a) From petroleum

(b) From wood

(c) From coal

(d) From L.P.G.

► (c) From coal

19. CNG and LPG are the examples of

(a) solid fuels

(b) liquid fuels

(c) gaseous fuels

(d) they are not fuels

► (c) gaseous fuels

20. A combustible substance is 

(a) wax

(b) sand

(c) water

(d) glass

► (a) wax

21. Lowest temperature at which a substrate catches fire is called its:

(a) blackening temperature

(b) vaporising temperature

(c) threshold temperature

(d) ignition temperature

► (d) ignition temperature

22. Burning of LPG is an example of:

(a) slow combustion

(b) spontaneous combustion

(c) Both slow combustion and spontaneous combustion

(d) rapid combustion

► (d) rapid combustion

23. Water works as a fire extinguisher by removing:

(a) source of combustible substance

(b) heat

(c) oxygen

(d) both oxygen and heat

► (d) both oxygen and heat

24. Substance that burns in oxygen to produce heat and light is called:

(a) renewable

(b) non combustible

(c) combustible

(d) limitless

► (b) combustible

25. The colour of the hottest part of the flame is:

(a) blue

(b) black

(c) yellow

(d) orange

► (a) blue

26. If a glass plate/slide is held into the luminous part of candle flame we see a circular blackish ring that represents:

(a) Unburnt carbon particles

(b) Formation of coal

(c) Burnt carbon particles

(d) Both burnt carbon particles and formation of coal

► (a) Unburnt carbon particles

27. The substances which give heat and light after combustion are called

(a) flame

(b) fuel

(c) combustion

(d) none of the above

► (b) fuel

28. Combustion is a _____ chemical reaction:

(a) volatile

(b) exothermic

(c) endothermic

(d) none of the above

► (b) exothermic

Hope the given MCQ Questions will help you in cracking exams with good marks. These Combustion and Flame MCQ Questions will help you in practising more and more questions in less time.

Related questions

0 votes
1 answer
0 votes
1 answer

Categories

/* */