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

Magnesium ribbon on burning in air produces:

[A]. Magnesium oxide water and light
[B]. Magnesium oxide and heat
[C]. Magnesium oxide heat and light
[D]. Magnesium oxide water and heat
Q2

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




Q3

In which of the following statements is or are correct?

[A]. A physical process in which a substance reacts with oxygen to give off heat is called combustion.
[B]. Water is the best extinguisher for fire involving electrical equipment.
[C]. Alcohol, CNG and LPG are inflammable substances.
[D]. Increased concentration of nitrogen in air is believed to cause global warming.
Q4

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.




Q5

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.
Q6

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

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



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

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.




Q9

Which of the following is not a combustible substance?

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