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
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.
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
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 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
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
The calorific value of a fuel is expressed in the unit called:
[A]. Kilo joule per litre
[B]. Kilogram per milliliter
[C]. Kilojoules per gram
[D]. Kilojoules per kilogram
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
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.
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
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
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
Q17
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.
Q18
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
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
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
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.
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Last Edited: June 12, 2023
