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
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
Q4
Which one among the following is considered as the cleanest fuel?
[A]. Cow dung cake
[B]. Petrol
[C]. Kerosene
[D]. Hydrogen gas
Q5
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.
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
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.
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
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
The substance expected to have the highest ignition temperature out of the following is:
[A]. Kerosene
[B]. Petrol
[C]. Coal
[D]. Alcohol
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
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
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
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
