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 2020-2021

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 2020-2021 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

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
Q2

Paheli is writing some statement which is given by her teacher. Would you help him to choose the incorrect statements?

[A]. Chemical process in which a substance reacts with oxygen to give off heat is called combustion.
[B]. The lowest temperature at which a substance catches fire is called its ignition temperature.
[C]. Ignition temperature of petrol is lower than that of wood.
[D]. Wood, paper, CNG are non-combustible substance.




Q3

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.
Q4

Consider the following statements, choose the incorrect one:

[A]. Chemical process in which a substance reacts with the oxygen to give heat and light is called combustion.
[B]. Oxygen is necessary for combustion to take place.
[C]. Respiration is a kind of fast combustion of food which takes place in the body.
[D]. The process of rusting of iron is an example of slow combustion.
Q5

The substance expected to have the highest ignition temperature out of the following is:

[A]. Kerosene
[B]. Petrol
[C]. Coal
[D]. Alcohol
Q6

If a person’s clothes catch fire the best way to extinguish the fire is to:

[A]. Throw water on the clothes
[B]. Use fire extinguisher
[C]. Cover the person with a woolen blanket
[D]. Cover the person with a polythene sheet



Q7

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

[A]. When water is thrown on a burning substance it gets cooled below its ignition temperature and stops burning.
[B]. The fire produced by burning oil (frying pan) and petrol (petrol pumps, oil tanks etc.) cannot be extinguished by using water.
[C]. The fire caused by electrical short circuit in an electrical appliance or in electrical wiring should not be extinguished by throwing water.
[D]. All the above
Q8

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.




Q9

Which of the following has the highest calorific value?

[A]. Kerosene
[B]. Biogas
[C]. LPG
[D]. Petrol
Q10

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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