Updated on June 12, 2023
by Tiwari Academy
by Tiwari Academy
Class 8 Science Chapter 4 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 4 MCQ Online Tests
| Class: 8 | Science |
| Chapter 4: | Combustion and Flame |
| Contents: | MCQ Online Tests with Explanation |
| Academic Session: | 2024-25 |
Class 8 Science Chapter 4 MCQ with Answers and Explanation
MCQ Online tests for class 8 Science chapter 4 are given below with answer and explanation. All the questions are taken from Latest CBSE NCERT Books for 2024-25 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
Shyam was cooking potato curry on a chulha. To his surprise, he observed that the copper vessel was getting blackened from outside. It may be due to:
[A]. Proper combustion of fuel
[B]. Improper cooking of potato curry
[C]. Improper combustion of fuel
[D]. Burning of copper vessel
Q3
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.
Q4
Boojho is writing some statements, choose the correct statement and help him:
[A]. Calorific value of wood is higher than that of coal.
[B]. Magnesium is a non-combustible metal.
[C]. Air is necessary for combustion.
[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
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
Q7
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.
Q8
Which of the following statement is or are incorrect?
[A]. Compressed natural gas have higher calorific value than that of petrol.
[B]. Petroleum gas and natural gas are the example of gaseous fuel.
[C]. The calorific value of a fuel is expressed in kJ/kg.
[D]. Removal of oxygen is the only way of extinguish any fire.
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
Choose the correct statement about inflammable substance from the following:
[A]. Low ignition temperature and cannot catch fire easily.
[B]. High condition temperature and can catch fire easily.
[C]. Low ignition temperature and can catch fire easily.
[D]. High ignition temperature and cannot catch fire easily.
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
The substance expected to have the highest ignition temperature out of the following is:
[A]. Kerosene
[B]. Petrol
[C]. Coal
[D]. Alcohol
Q14
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
Q15
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
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
Boojho is writing some statements but he confused to know whether the statements are correct or not? Would you help him?
[A]. Rapid combustion is that type of combustion in which a large amount of heat and light are produced in a short time.
[B]. Spontaneous is that type of combustion in which reaction occurs on its own without helping of heat.
[C]. Explosive combustion is that type of combustion in which a large amount of heat, light and sound are produced in very fast way.
[D]. All the above.
Q19
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.
Q20
The substance that does not burn with flame is:
[A]. LPG
[B]. Camphor
[C]. Dry grass
[D]. Charcoal
Q21
Which of the following is not a combustible substance?
[A]. Camphor
[B]. Glass
[C]. Straw
[D]. Alcohol
Q22
Which of the following has the highest calorific value?
[A]. Kerosene
[B]. Biogas
[C]. LPG
[D]. Petrol
Q23
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
Q24
In which of the following sentences are incorrect?
[A]. A chemical process in which a substance reacts with oxygen to give off heat, is called combustion.
[B]. When the clothes of a person catch fire, the person is covered with the blanket to extinguish fire.
[C]. The lowest temperature at which a substance catches fire is called, its ignition temperature.
[D]. The substances which give very high ignition, temperature and can easily catch fire with a flame, are called inflammable substances.
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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Last Edited: June 12, 2023
