Class 8 Science Chapter 6 MCQ

Class 8 Science Chapter 6 MCQ (Multiple Choice Questions) of Combustion and Flame. After doing NCERT Books, these questions help in revising the chapter for tests and exams. There are more than 80 questions divided into sets of 10 questions each.

These questions cover all the important topic and intext questions from NCERT Books. Some exercises questions are also included in these practice tests.

Class 8 Science Chapter 6 MCQ Online Tests for 2021-2022

Class: 8Science
Chapter 6:Combustion and Flame
Contents:MCQ Online Tests with Explanation

Class 8 Science Chapter 6 MCQ with Answers and Explanation

MCQ Online tests for class 8 Science chapter 6 are given below with answer and explanation. All the questions are taken from Latest CBSE NCERT Books for 2021-2022 and are important for examination point of view. These MCQ Quiz questions takes hardly 30 minutes to complete and help to score better than ever.

Q1

Paheli is writing some statements. She wants to know in which of the following statements is or are incorrect?

[A]. The substance which vaporize during burning give flame.
[B]. Diesel is a combustible substance.
[C]. Glass is a non-combustible material.
[D]. Matchstick burn by itself.
Q2

Consider the following statements, choose the incorrect one:

[A]. Some substances on combustion produces heat and flame.
[B]. The amount of heat energy produced on complete combustion of 1 kg of fuel is called its calorific value.
[C]. When CNG burns, it produces harmful products in very small amount.
[D]. None of the above.
Q3

Choose the incorrect statement from the following: “A good fuel is one which …

[A]. Is readily available
[B]. Produces a large amount of heat
[C]. Leaves behind many and desirable substances
[D]. Burns easily in air at a moderate rate
Q4

Which of the following represents the correct statements?

[A]. Outer zone of complete combustion is the hottest part which is blue in colour.
[B]. Middle zone of partial combustion is the moderate hot part which is yellow in colour.
[C]. Innermost zone of unburnt wax vapours is least hot which is black in colour.
[D]. All the above
Q5

Which one among the following is considered as the cleanest fuel?

[A]. Cow dung cake
[B]. Petrol
[C]. Kerosene
[D]. Hydrogen gas




Q6

Consider the following statements and choose the correct one:

[A]. The substance which have very low ignition temperature and can easily catch fire with a flame are called inflammable substance.
[B]. The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific value.
[C]. Inflammable substance have very low ignition temperature.
[D]. All the above
Q7

In villages, people use wood as fuel because:

[A]. It is considered to be an ideal fuel
[B]. Of its easily available and low cost
[C]. It is environment friendly
[D]. It catches fire easily
Q8

Boojho appeared in class test where he wrote some statements but he confused to know the incorrect statement. Would you help him to know that?

[A]. Greater the calorific value, better is the fuel.
[B]. Middle zone is the hottest zone of a flame.
[C]. The substances which vaporize during burning give flame.
[D]. Calorific value of wood is higher than that of coal.
Q9

Mohan is writing some statements, choose the correct statements and help him:

[A]. Phosphorus is the only non-metal which catch fire if exposed to air.
[B]. The lowest temperature at which a substance catches fire is called its ignition temperature.
[C]. Combustion is a chemical process in which a substance reacts with oxygen to give off heat.
[D]. All the above
Q10

Choose the incorrect statement from the following: “Forest fires are usually due to …”

[A]. Carelessness of humans
[B]. Heat of sun
[C]. Cutting of trees
[D]. Lightning Strike



Q11

Boojho is writing some statements about polyester. In which of the following statements is or are incorrect? Help him.

[A]. In the sun, heat and light are produced due to nuclear reactions.
[B]. The heat and light produced in the sun are ordinary combustion as like fire.
[C]. A substance which can burn are called combustible substances.
[D]. When a magnesium ribbon burns it combines with oxygen of air to form magnesium oxide and liberate heat and light.
Q12

Consider the following statements and choose the incorrect statement(s):

[A]. The burning of magnesium in air to produce heat and light is a combustion process.
[B]. When charcoal burns, then the carbon of charcoal combines with oxygen of air to form carbon dioxide.
[C]. A combustible substance is also called a fuel.
[D]. Those substances which can undergo combustion are called non-combustible substances.
Q13

Boojho is writing some sentences about condition for combustion. Choose the correct sentences and help him:

[A]. Heating the combustible substance to its ignition temperature.
[B]. Presence of a supporter of combustion like air or oxygen.
[C]. Presence of a combustible substance.
[D]. All the above.
Q14

Boojho is writing some statements about polyester. In which of the following statements is or are incorrect? Help him.

[A]. The lowest temperature at which substance catch fire and starts burning, is called its ignition temperature.
[B]. The substance which have very low ignition temperature and can easily catch fire with a flame are inflammable substances.
[C]. Coal has a high ignition temperature, so coal fire cannot be started by using a lighted matchstick directly.
[D]. None of the above
Q15

Consider the following statements, choose the incorrect one:

[A]. The forest fires occur during the hottest summer day.
[B]. It is very difficult to burn a heap of dry leaves.
[C]. The head of matchstick contains only antimony tri-Sulphide and potassium chlorate.
[D]. All the above



Q16

Which of the following statement is or are incorrect?

[A]. A small fire can be extinguished by throwing sand or soil over it.
[B]. If the clothes of person working in the kitchen catch fire, the person is immediately covered with a blanket.
[C]. The combustion reaction in which a large amount of heat and light produced in a short time is called rapid combustion.
[D]. Any fire needs heat and combustible materials to occur.
Q17

On placing an inverted tumbler over a burning candle, the flame extinguishes after sometime. This is because of non-availability of:

[A]. Oxygen
[B]. Water vapors
[C]. Carbon dioxide
[D]. Wax
Q18

Consider the given statements and choose the incorrect one:

[A]. The immediate burning of cooking gas store is an example of rapid combustion.
[B]. The burning of white phosphorus is an example of spontaneous combustion.
[C]. Bursting of crackers is an example of explosive combustion.
[D]. The spontaneous combustion which take place in nature are less dangerous.
Q19

The substance that does not burn with flame is:

[A]. LPG
[B]. Camphor
[C]. Dry grass
[D]. Charcoal
Q20

Paheli is writing some statements but she confused to know whether the statements are incorrect or not? Would you help her?

[A]. Fuel is a material which is burnt to produce heat.
[B]. Different fuels produce different amount of heat on burning.
[C]. The amount of heat produced by the complete burning of 1 kg of a fuel is called its calorific value.
[D]. The calorific value of coal is much higher than the calorific value of LPG.




Q21

Saumya is writing about “ideal fuel” as ideal fuel is cheap easy to transfer and readily available in the market. Choose in correct sentences written by Saumya:

[A]. It does not produce harmful gases or do not leave any residue after burning.
[B]. It has a proper ignition temperature.
[C]. It can burn easily in air at a moderate rate.
[D]. It has a low calorific value for proper burning.
Q22

Which of the following is not a combustible substance?

[A]. Camphor
[B]. Glass
[C]. Straw
[D]. Alcohol
Q23

Which of the following has the highest calorific value?

[A]. Kerosene
[B]. Biogas
[C]. LPG
[D]. Petrol
Q24

A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance?

[A]. Iron Nail
[B]. Glass
[C]. Stone
[D]. Wood
Q25

Boojho is writing about the factors of “Global warming”. Considered the sentences written by Boojho and choose in correct one(s):

[A]. The burning of fuels like wood, coal and petroleum releases unburnt carbon particles in air.
[B]. Incomplete combustion can create carbon mono oxide, which is very poisonous.
[C]. Burning of petrol and diesel engine of vehicles releases nitrogen oxides into the air.
[D]. None of the above.

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