Combustion and Flame MCQ

Q: What is combustion?

A chemical process in which a substance reacts with oxygen to give off heat.

Q: What are the conditions necessary for combustion?

Fuel Air (to supply oxygen) Heat (to raise the temperature of the fuel beyond the ignition temperature)

Q: What are the different types of combustion?

Rapid combustion Spontaneous combustion Explosion

Q: What are the different zones of a flame?

Dark zone Luminous zone Non-luminous zone

Question 1

Question 1: Which of these is an example of combustion?

A. Ice meltingB. A candle burningC. Water boilingD. A plant growing

Answer

B. A candle burning. Combustion involves burning and producing heat and light. (Combustion and Flame MCQ by Top100MCQ.com)

Question 2

Question 2: What is combustion?

A. A process where a substance reacts with oxygen to produce heatB. A process where a substance changes state from solid to liquidC. A process where a substance cools downD. A process where a substance mixes with water

Answer

A. A process where a substance reacts with oxygen to produce heat. This is the definition of combustion. (Combustion and Flame MCQ by Top100MCQ.com)

Question 3

Question 3: Which of these fuels burns with a flame?

A. CoalB. CandleC. CharcoalD. Cow dung cake

Answer

B. Candle. Candles burn with a flame while others burn without a flame. (Combustion and Flame MCQ by Top100MCQ.com)

Question 4

Question 4: Which of these is a combustible substance?

A. StoneB. GlassC. PaperD. Iron nail

Answer

C. Paper. Paper can burn, making it combustible. (Combustion and Flame MCQ by Top100MCQ.com)

Question 5

Question 5: Which of these is a non-combustible substance?

A. WoodB. KeroseneC. MatchsticksD. Glass

Answer

D. Glass. Glass cannot burn, making it non-combustible. (Combustion and Flame MCQ by Top100MCQ.com)

Question 6

Question 6: Which of these is an example of combustion in daily life?

A. A light bulb glowingB. Cooking gas burningC. An ice cube meltingD. A fan rotating

Answer

B. Cooking gas burning. Cooking gas burns with oxygen to produce heat. (Combustion and Flame MCQ by Top100MCQ.com)

Question 7

Question 7: What is the main difference between burning a candle and burning coal?

A. Coal produces more heatB. A candle burns with a flame, while coal does notC. Coal burns fasterD. A candle requires oxygen, while coal does not

Answer

B. A candle burns with a flame, while coal does not. This is the primary visual difference between the two. (Combustion and Flame MCQ by Top100MCQ.com)

Question 8

Question 8: Which of these is a product of combustion?

A. WaterB. HeatC. OxygenD. Carbon

Answer

B. Heat. Combustion always produces heat. (Combustion and Flame MCQ by Top100MCQ.com)

Question 9

Question 9: What gas is necessary for combustion to occur?

A. Carbon dioxideB. NitrogenC. OxygenD. Hydrogen

Answer

C. Oxygen. Oxygen is the key component of air that supports combustion. (Combustion and Flame MCQ by Top100MCQ.com)

Question 10

Question 10: What is a fuel?

A. Any substance that can be used to produce energyB. A substance that undergoes combustionC. A substance that is always in a solid stateD. A substance that does not react with oxygen

Answer

B. A substance that undergoes combustion. Fuels are combustible materials. (Combustion and Flame MCQ by Top100MCQ.com)

Question 11

Question 11: Which of these is a combustible substance?

A. GoldB. CharcoalC. GlassD. Water

Answer

B. Charcoal. Charcoal can burn in the presence of oxygen. (Combustion and Flame MCQ by Top100MCQ.com)

Question 12

Question 12: What is the chemical process of burning called?

A. CondensationB. EvaporationC. CombustionD. Sublimation

Answer

C. Combustion. Combustion is the scientific term for burning. (Combustion and Flame MCQ by Top100MCQ.com)

Question 13

Question 13: What is the main difference between a combustible and a non-combustible substance?

A. Combustible substances are always solidB. Non-combustible substances produce heatC. Combustible substances can burn in the presence of oxygenD. Non-combustible substances are always heavier

Answer

C. Combustible substances can burn in the presence of oxygen. This is the defining characteristic of a combustible substance. (Combustion and Flame MCQ by Top100MCQ.com)

Question 14

Question 14: Which of these is a product of combustion?

A. OxygenB. NitrogenC. LightD. Water vapor

Answer

C. Light. Combustion often produces light, either as a flame or a glow. (Combustion and Flame MCQ by Top100MCQ.com)

Question 15

Question 15: Which of these is an example of combustion?

A. A plant making foodB. A metal rustingC. Wood burningD. Water freezing

Answer

C. Wood burning. Wood burning involves a chemical reaction with oxygen, producing heat and light. (Combustion and Flame MCQ by Top100MCQ.com)

Question 16

Question 16: What happens when a substance undergoes combustion?

A. It meltsB. It reacts with oxygenC. It dissolvesD. It changes state

Answer

B. It reacts with oxygen. This reaction is the core of combustion. (Combustion and Flame MCQ by Top100MCQ.com)

Question 17

Question 17: Which of these is a fuel?

A. IronB. GlassC. SandD. Petrol

Answer

D. Petrol. Petrol is a liquid fuel used in vehicles. (Combustion and Flame MCQ by Top100MCQ.com)

Question 18

Question 18: What is the primary source of energy for our body?

A. SunlightB. WaterC. FoodD. Oxygen

Answer

C. Food. Food acts as a fuel for our body, reacting with oxygen to produce energy. (Combustion and Flame MCQ by Top100MCQ.com)

Question 19

Question 19: What is the role of air in combustion?

A. It cools down the fuelB. It provides nitrogen for the reactionC. It provides oxygen for the reactionD. It has no role in combustion

Answer

C. It provides oxygen for the reaction. Oxygen is the essential component of air for combustion. (Combustion and Flame MCQ by Top100MCQ.com)

Question 20

Question 20: What happens to a candle flame when it is covered with a glass jar?

A. It burns brighterB. It goes outC. It changes colorD. It remains unchanged

Answer

B. It goes out. The lack of oxygen supply extinguishes the flame. (Combustion and Flame MCQ by Top100MCQ.com)

Question 21

Question 21: What is ignition temperature?

A. The temperature at which a substance starts to meltB. The temperature at which a substance starts to boilC. The lowest temperature at which a substance catches fireD. The highest temperature at which a substance can burn

Answer

C. The lowest temperature at which a substance catches fire. This is the definition of ignition temperature. (Combustion and Flame MCQ by Top100MCQ.com)

Question 22

Question 22: Why does a matchstick not catch fire on its own at room temperature?

A. Because it needs oxygen to burnB. Because it needs heat to reach its ignition temperatureC. Because it is not a combustible substanceD. Because it is wet

Answer

B. Because it needs heat to reach its ignition temperature. The friction from striking the match provides this heat. (Combustion and Flame MCQ by Top100MCQ.com)

Question 23

Question 23: Why does a paper cup with water in it not burn when heated by a candle?

A. Because water is a non-combustible substanceB. Because water cools down the paperC. Because water prevents oxygen from reaching the paperD. Because water absorbs the heat, preventing the paper from reaching its ignition temperature

Answer

D. Because water absorbs the heat, preventing the paper from reaching its ignition temperature. The heat is transferred to the water, keeping the paper below its ignition point. (Combustion and Flame MCQ by Top100MCQ.com)

Question 24

Question 24: What are inflammable substances?

A. Substances that do not burnB. Substances that burn with a low flameC. Substances that have a very high ignition temperatureD. Substances that have a very low ignition temperature

Answer

D. Substances that have a very low ignition temperature. These substances catch fire easily. (Combustion and Flame MCQ by Top100MCQ.com)

Question 25

Question 25: Which of these is an example of an inflammable substance?

A. WoodB. CoalC. LPGD. Iron

Answer

C. LPG. LPG has a very low ignition temperature. (Combustion and Flame MCQ by Top100MCQ.com)

Question 26

Question 26: Why is it necessary for a substance to reach its ignition temperature to burn?

A. To ensure enough oxygen is presentB. To overcome the activation energy required for combustionC. To change the state of the substanceD. To make the substance combustible

Answer

B. To overcome the activation energy required for combustion. Reaching the ignition temperature provides the necessary energy for the combustion reaction to start. (Combustion and Flame MCQ by Top100MCQ.com)

Question 27

Question 27: What is the most common way to extinguish a fire?

A. Removing the fuelB. Adding more oxygenC. Increasing the temperatureD. Cooling down the fuel

Answer

D. Cooling down the fuel. This is typically done by using water. (Combustion and Flame MCQ by Top100MCQ.com)

Question 28

Question 28: What is the primary function of a fire extinguisher?

A. To provide more fuel to the fireB. To remove oxygen or reduce the temperature of the fuelC. To help the fire spread fasterD. To increase the ignition temperature of the fuel

Answer

B. To remove oxygen or reduce the temperature of the fuel. This disrupts the combustion process. (Combustion and Flame MCQ by Top100MCQ.com)

Question 29

Question 29: Why is water not suitable for extinguishing fires involving electrical equipment?

A. Because water is a combustible substanceB. Because water can conduct electricityC. Because water is too coldD. Because water is too heavy

Answer

B. Because water can conduct electricity. This can electrocute the person trying to extinguish the fire. (Combustion and Flame MCQ by Top100MCQ.com)

Question 30

Question 30: Which gas is the best extinguisher for fires involving oil and petrol?

A. OxygenB. NitrogenC. Carbon dioxideD. Hydrogen

Answer

C. Carbon dioxide. It is heavier than oxygen and forms a blanket over the fire, cutting off the oxygen supply. (Combustion and Flame MCQ by Top100MCQ.com)

Question 31

Question 31: How does carbon dioxide extinguish a fire?

A. By adding more fuel to the fireB. By increasing the temperature of the fireC. By cutting off the supply of oxygen to the fireD. By making the fuel non-combustible

Answer

C. By cutting off the supply of oxygen to the fire. Carbon dioxide displaces oxygen, smothering the fire. (Combustion and Flame MCQ by Top100MCQ.com)

Question 32

Question 32: What are the three essential requirements for producing fire?

A. Fuel, nitrogen, and heatB. Fuel, carbon dioxide, and lightC. Fuel, oxygen, and ignition temperatureD. Fuel, water, and pressure

Answer

C. Fuel, oxygen, and ignition temperature. These three elements are necessary for combustion to occur. (Combustion and Flame MCQ by Top100MCQ.com)

Question 33

Question 33: Why is it important to know the telephone number of the fire service?

A. To order new fire extinguishersB. To report a fire emergencyC. To schedule a fire safety inspectionD. To get information about different types of fires

Answer

B. To report a fire emergency. This allows for a quick response in case of a fire. (Combustion and Flame MCQ by Top100MCQ.com)

Question 34

Question 34: What is the most common fire extinguisher?

A. WaterB. Carbon dioxideC. FoamD. Dry powder

Answer

A. Water. It is readily available and effective for many types of fires. (Combustion and Flame MCQ by Top100MCQ.com)

Question 35

Question 35: What is rapid combustion?

A. Combustion that occurs spontaneouslyB. Combustion that produces a lot of smokeC. Combustion that occurs quickly and produces heat and lightD. Combustion that occurs very slowly

Answer

C. Combustion that occurs quickly and produces heat and light. This is the definition of rapid combustion. (Combustion and Flame MCQ by Top100MCQ.com)

Question 36

Question 36: Which of these is an example of rapid combustion?

A. A candle burningB. A piece of wood slowly decayingC. A metal rustingD. A plant growing

Answer

A. A candle burning. The candle flame burns quickly and produces heat and light. (Combustion and Flame MCQ by Top100MCQ.com)

Question 37

Question 37: What is spontaneous combustion?

A. Combustion that requires external heat to startB. Combustion that occurs without any apparent external causeC. Combustion that always produces an explosionD. Combustion that occurs only in liquids

Answer

B. Combustion that occurs without any apparent external cause. The substance ignites seemingly on its own. (Combustion and Flame MCQ by Top100MCQ.com)

Question 38

Question 38: Which of these can cause spontaneous combustion?

A. Extreme coldB. The presence of waterC. The heat of the sunD. Lack of oxygen

Answer

C. The heat of the sun. The sun’s heat can raise the temperature of a substance to its ignition point. (Combustion and Flame MCQ by Top100MCQ.com)

Question 39

Question 39: What is an explosion?

A. A very slow combustion reactionB. A combustion reaction that produces only lightC. A combustion reaction that produces a large amount of gas and a loud soundD. A combustion reaction that occurs only in solids

Answer

C. A combustion reaction that produces a large amount of gas and a loud sound. Explosions are rapid and violent combustion reactions. (Combustion and Flame MCQ by Top100MCQ.com)

Question 40

Question 40: Which of these is an example of an explosion?

A. A candle burningB. A firework explodingC. A piece of wood burningD. A metal rusting

Answer

B. A firework exploding. Fireworks are designed to explode, producing a rapid release of gas, heat, light, and sound. (Combustion and Flame MCQ by Top100MCQ.com)

Question 41

Question 41: What is the difference between rapid combustion and an explosion?

A. Rapid combustion is slower than an explosionB. Rapid combustion produces more heat than an explosionC. Rapid combustion does not produce light, while an explosion doesD. Rapid combustion occurs only in liquids, while explosions occur only in solids

Answer

A. Rapid combustion is slower than an explosion. Explosions are extremely rapid combustion reactions. (Combustion and Flame MCQ by Top100MCQ.com)

Question 42

Question 42: Which of these is a safety concern related to spontaneous combustion?

A. It can cause fires in coal minesB. It can cause explosions in water bodiesC. It can lead to the formation of acid rainD. It can deplete the oxygen in the atmosphere

Answer

A. It can cause fires in coal mines. Coal dust can spontaneously ignite, leading to dangerous fires in mines. (Combustion and Flame MCQ by Top100MCQ.com)

Question 43

Question 43: What is the color of an LPG flame?

A. RedB. YellowC. BlueD. Green

Answer

C. Blue. LPG flames are typically blue. (Combustion and Flame MCQ by Top100MCQ.com)

Question 44

Question 44: Which of these materials produces a flame when burned?

A. CharcoalB. CandleC. CoalD. Iron nail

Answer

B. Candle. Candles burn with a flame due to the vaporization of wax. (Combustion and Flame MCQ by Top100MCQ.com)

Question 45

Question 45: Why do some materials produce flames while others do not?

A. Because some materials are heavier than othersB. Because some materials contain more oxygenC. Because some materials vaporize during burning, while others do notD. Because some materials are more expensive than others

Answer

C. Because some materials vaporize during burning, while others do not. The vaporized substances burn as a flame. (Combustion and Flame MCQ by Top100MCQ.com)

Question 46

Question 46: What is the color of a candle flame?

A. BlueB. YellowC. GreenD. Red

Answer

B. Yellow. Candle flames are typically yellow due to incomplete combustion. (Combustion and Flame MCQ by Top100MCQ.com)

Question 47

Question 47: Which of these materials does not produce a flame when burned?

A. KeroseneB. MagnesiumC. CharcoalD. Camphor

Answer

C. Charcoal. Charcoal does not vaporize and therefore does not produce a flame. (Combustion and Flame MCQ by Top100MCQ.com)

Question 48

Question 48: What causes the yellow color in a candle flame?

A. Complete combustion of the fuelB. The presence of oxygen in the airC. Incomplete combustion of the fuelD. The presence of water vapor in the air

Answer

C. Incomplete combustion of the fuel. This results in the formation of glowing soot particles that give off yellow light. (Combustion and Flame MCQ by Top100MCQ.com)

Question 49

Question 49: What is the purpose of a wick in a candle?

A. To provide oxygen to the flameB. To hold the candle uprightC. To draw up the molten wax and allow it to vaporizeD. To extinguish the flame

Answer

C. To draw up the molten wax and allow it to vaporize. The vaporized wax then burns as a flame. (Combustion and Flame MCQ by Top100MCQ.com)

Question 50

Question 50: Why does a kerosene stove produce a flame?

A. Because kerosene is a solid fuelB. Because kerosene does not require oxygen to burnC. Because kerosene vaporizes when heatedD. Because kerosene is heavier than air

Answer

C. Because kerosene vaporizes when heated. The vaporized kerosene mixes with oxygen and burns as a flame. (Combustion and Flame MCQ by Top100MCQ.com)

Question 51

Question 51: What is the main difference between a flame and a glow?

A. A flame is hotter than a glowB. A flame is produced by solid fuels, while a glow is produced by liquid fuelsC. A flame is produced by vaporized substances, while a glow is produced by solid substancesD. A flame is always yellow, while a glow is always blue

Answer

C. A flame is produced by vaporized substances, while a glow is produced by solid substances. Glows are produced by the incandescence of solid substances. (Combustion and Flame MCQ by Top100MCQ.com)

Question 52

Question 52: What can be observed when a glass tube is introduced into the dark zone of a candle flame?

A. The glass tube catches fire.B. Smoke enters the glass tube.C. Wax vapors can be seen inside the glass tube.D. Nothing happens.

Answer

C. Wax vapors can be seen inside the glass tube. The heat from the flame vaporizes the wax, and these vapors rise up through the wick. (Combustion and Flame MCQ by Top100MCQ.com)

Question 53

Question 53: What does the dark zone of a candle flame indicate?

A. The hottest part of the flame.B. The area of complete combustion.C. The presence of unburnt wax vapors.D. The absence of oxygen.

Answer

C. The presence of unburnt wax vapors. This zone is relatively cool and contains wax vapors that have not yet started to burn. (Combustion and Flame MCQ by Top100MCQ.com)

Question 54

Question 54: What is observed when a glass plate is introduced into the luminous zone of a candle flame?

A. The glass plate melts.B. A circular blackish ring forms on the glass plate.C. The flame is extinguished.D. The flame changes color.

Answer

B. A circular blackish ring forms on the glass plate. This indicates the deposition of unburnt carbon particles present in this zone. (Combustion and Flame MCQ by Top100MCQ.com)

Question 55

Question 55: Why does a blackish ring form on the glass plate when it is held in the luminous zone of a candle flame?

A. Due to the deposition of unburnt carbon particles.B. Due to the condensation of water vapor.C. Due to the burning of the glass plate.D. Due to the reaction of the glass plate with oxygen.

Answer

A. Due to the deposition of unburnt carbon particles. These particles are a product of incomplete combustion in this zone. (Combustion and Flame MCQ by Top100MCQ.com)

Question 56

Question 56: What can be inferred when a copper wire is held in the non-luminous zone of a candle flame?

A. The non-luminous zone is the coolest part of the flame.B. The non-luminous zone is the hottest part of the flame.C. The copper wire reacts with the flame.D. The copper wire becomes coated with wax.

Answer

B. The non-luminous zone is the hottest part of the flame. The copper wire gets red hot, indicating the high temperature of this zone. (Combustion and Flame MCQ by Top100MCQ.com)

Question 57

Question 57: Which zone of a candle flame is the hottest?

A. The dark zone.B. The luminous zone.C. The non-luminous zone.D. All zones have the same temperature.

Answer

C. The non-luminous zone. This is the outermost zone of the flame where complete combustion occurs. (Combustion and Flame MCQ by Top100MCQ.com)

Question 58

Question 58: Why do goldsmiths use the outermost zone of a flame for melting gold and silver?

A. Because it is the coolest part of the flame.B. Because it contains unburnt wax vapors.C. Because it is the hottest part of the flame.D. Because it produces a yellow light.

Answer

C. Because it is the hottest part of the flame. This zone provides the necessary heat for melting metals. (Combustion and Flame MCQ by Top100MCQ.com)

Question 59

Question 59: What causes the different colors in a candle flame?

A. The type of wax used.B. The temperature variations within the flame.C. The amount of oxygen present.D. The presence of different gases in the flame.

Answer

B. The temperature variations within the flame. Different zones of the flame have different temperatures, leading to different colors. (Combustion and Flame MCQ by Top100MCQ.com)

Question 60

Question 60: What is the significance of the different zones in a candle flame?

A. They indicate the different stages of combustion.B. They have no significance.C. They indicate the purity of the wax.D. They indicate the direction of the wind.

Answer

A. They indicate the different stages of combustion. Each zone represents a different stage in the burning of the wax vapors. (Combustion and Flame MCQ by Top100MCQ.com)

Question 61

Question 61: What is a fuel?

A. Any substance that can be used to produce energyB. A substance that undergoes combustionC. A substance that is always in a solid stateD. A substance that does not react with oxygen

Answer

B. A substance that undergoes combustion. Fuels are combustible materials. (Combustion and Flame MCQ by Top100MCQ.com)

Question 62

Question 62: Which of these is a characteristic of a good fuel?

A. It is very expensive.B. It burns very slowly.C. It produces a lot of smoke.D. It is readily available.

Answer

D. It is readily available. A good fuel should be easy to obtain. (Combustion and Flame MCQ by Top100MCQ.com)

Question 63

Question 63: Which of these is a solid fuel?

A. PetrolB. KeroseneC. CoalD. LPG

Answer

C. Coal. Coal is a commonly used solid fuel. (Combustion and Flame MCQ by Top100MCQ.com)

Question 64

Question 64: Which of these is a liquid fuel?

A. WoodB. DieselC. Natural gasD. Charcoal

Answer

B. Diesel. Diesel is a liquid fuel used in vehicles. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

C. CNG. CNG (Compressed Natural Gas) is a gaseous fuel used in vehicles. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

B. Because it is easily available and inexpensive. In many rural areas, wood is readily accessible and costs less than other fuels. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

C. It produces a lot of smoke, which is harmful. Wood smoke can cause respiratory problems and pollution. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

A. The amount of heat energy produced on complete combustion of 1 kg of a fuel. Calorific value measures the efficiency of a fuel. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

B. Kilojoule per kg (kJ/kg). This unit expresses the amount of energy produced per unit mass of the fuel. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

D. LPG. LPG has a higher calorific value than the other fuels listed. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

C. Because it produces less harmful products upon combustion. CNG produces fewer pollutants compared to petrol or diesel. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

C. It releases pollutants that can cause respiratory diseases. Unburnt carbon particles and other pollutants can cause respiratory problems. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

B. The rise in temperature of the earth’s atmosphere. Global warming is linked to the increased concentration of carbon dioxide in the atmosphere. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

C. By increasing the concentration of carbon dioxide in the atmosphere. Carbon dioxide is a greenhouse gas that traps heat. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

A. Rain that is acidic due to dissolved oxides of sulfur and nitrogen. These oxides are released by the burning of fossil fuels. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

D. It is harmful for crops, buildings, and soil. Acid rain can damage plants, corrode materials, and acidify water bodies. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

D. Sulfur dioxide. Sulfur dioxide is released by the burning of coal and diesel. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

B. Because it produces carbon monoxide, which is a poisonous gas. Carbon monoxide is odorless and colorless, making it difficult to detect. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

D. It contributes to global warming and loss of biodiversity. Trees absorb carbon dioxide, so cutting them down reduces the earth’s ability to absorb this greenhouse gas. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

C. Carelessness of human beings. Human activities like unextinguished campfires or discarded cigarettes are major causes of forest fires. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

B. To control or extinguish fire. Fire extinguishers are designed to put out fires by various means like cutting off oxygen supply or cooling the fuel. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

C. Cutting down trees and clearing forests. Deforestation has several negative environmental impacts. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

C. Melting of polar glaciers and rise in sea level. Global warming causes polar ice to melt, leading to a rise in sea levels. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

D. All of the above. These measures help prevent coal dust from reaching its ignition temperature and spontaneously combusting. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

A. To prevent forest fires. Smoldering embers from unextinguished campfires can easily ignite dry leaves and cause forest fires. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

D. Both B and C. Calling the fire service ensures professional help, and evacuating protects yourself and others. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

D. All of the above. Understanding combustion is crucial for safety, efficiency, and environmental protection. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

D. All of the above. These actions help reduce fuel consumption and mitigate the environmental impact. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

B. Store flammable materials safely. Proper storage of flammable substances reduces the risk of accidental fires. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

C. To be prepared to control a fire in its early stages. Fire extinguishers can help prevent a small fire from becoming a major disaster. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

B. Use a fire blanket or a carbon dioxide extinguisher. Water is ineffective on oil fires and can even spread the fire. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

B. To alert people of a fire. Fire alarms provide early warning, allowing people to evacuate safely. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

B. Incomplete combustion of fuels in enclosed spaces. This can lead to a buildup of carbon monoxide, which is a colorless and odorless gas. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

D. All of the above. These measures help reduce the risk of carbon monoxide buildup and poisoning. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

B. They absorb carbon dioxide from the atmosphere. Trees act as carbon sinks, helping to reduce greenhouse gas levels. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

D. All of the above. Fire safety education is crucial for preventing fires and minimizing their impact. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

A. Stop, drop, and roll. This action helps smother the flames and prevents further injury. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

D. All of the above. Fire drills are essential for preparedness and safety in case of a fire emergency. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

D. All of the above. Technology plays a significant role in enhancing fire safety measures. (Combustion and Flame MCQ by Top100MCQ.com)

Accepted Answer

D. All of the above. Fire safety awareness and preparedness are crucial for everyone. (Combustion and Flame MCQ by Top100MCQ.com)

Table of Contents

Introduction to Combustion

Question 3: Which of these fuels burns with a flame?A. CoalB. CandleC. CharcoalD. Cow dung cakeShow ExplanationCorrect Answer: B. Candle. Candles burn with a flame while others burn without a flame. (Combustion and Flame MCQ by Top100MCQ.com) (adsbygoogle=window.adsbygoogle||[]).push({})

Question 4: Which of these is a combustible substance?A. StoneB. GlassC. PaperD. Iron nailShow ExplanationCorrect Answer: C. Paper. Paper can burn, making it combustible. (Combustion and Flame MCQ by Top100MCQ.com)

Question 5: Which of these is a non-combustible substance?A. WoodB. KeroseneC. MatchsticksD. GlassShow ExplanationCorrect Answer: D. Glass. Glass cannot burn, making it non-combustible. (Combustion and Flame MCQ by Top100MCQ.com) (adsbygoogle=window.adsbygoogle||[]).push({})

Question 8: Which of these is a product of combustion?A. WaterB. HeatC. OxygenD. CarbonShow ExplanationCorrect Answer: B. Heat. Combustion always produces heat. (Combustion and Flame MCQ by Top100MCQ.com) (adsbygoogle=window.adsbygoogle||[]).push({})

The Process of Combustion

Question 9: What gas is necessary for combustion to occur?A. Carbon dioxideB. NitrogenC. OxygenD. HydrogenShow ExplanationCorrect Answer: C. Oxygen. Oxygen is the key component of air that supports combustion. (Combustion and Flame MCQ by Top100MCQ.com) (adsbygoogle=window.adsbygoogle||[]).push({})

Question 11: Which of these is a combustible substance?A. GoldB. CharcoalC. GlassD. WaterShow ExplanationCorrect Answer: B. Charcoal. Charcoal can burn in the presence of oxygen. (Combustion and Flame MCQ by Top100MCQ.com) (adsbygoogle=window.adsbygoogle||[]).push({})

Question 12: What is the chemical process of burning called?A. CondensationB. EvaporationC. CombustionD. SublimationShow ExplanationCorrect Answer: C. Combustion. Combustion is the scientific term for burning. (Combustion and Flame MCQ by Top100MCQ.com)

Question 14: Which of these is a product of combustion?A. OxygenB. NitrogenC. LightD. Water vaporShow ExplanationCorrect Answer: C. Light. Combustion often produces light, either as a flame or a glow. (Combustion and Flame MCQ by Top100MCQ.com) (adsbygoogle=window.adsbygoogle||[]).push({})

Question 16: What happens when a substance undergoes combustion?A. It meltsB. It reacts with oxygenC. It dissolvesD. It changes stateShow ExplanationCorrect Answer: B. It reacts with oxygen. This reaction is the core of combustion. (Combustion and Flame MCQ by Top100MCQ.com)

Question 17: Which of these is a fuel?A. IronB. GlassC. SandD. PetrolShow ExplanationCorrect Answer: D. Petrol. Petrol is a liquid fuel used in vehicles. (Combustion and Flame MCQ by Top100MCQ.com)

Conditions Necessary for Combustion

Question 25: Which of these is an example of an inflammable substance?A. WoodB. CoalC. LPGD. IronShow ExplanationCorrect Answer: C. LPG. LPG has a very low ignition temperature. (Combustion and Flame MCQ by Top100MCQ.com)

Controlling Fire

Question 27: What is the most common way to extinguish a fire?A. Removing the fuelB. Adding more oxygenC. Increasing the temperatureD. Cooling down the fuelShow ExplanationCorrect Answer: D. Cooling down the fuel. This is typically done by using water. (Combustion and Flame MCQ by Top100MCQ.com)

Question 34: What is the most common fire extinguisher?A. WaterB. Carbon dioxideC. FoamD. Dry powderShow ExplanationCorrect Answer: A. Water. It is readily available and effective for many types of fires. (Combustion and Flame MCQ by Top100MCQ.com)

Types of Combustion

Flame

Question 43: What is the color of an LPG flame?A. RedB. YellowC. BlueD. GreenShow ExplanationCorrect Answer: C. Blue. LPG flames are typically blue. (Combustion and Flame MCQ by Top100MCQ.com)

Question 44: Which of these materials produces a flame when burned?A. CharcoalB. CandleC. CoalD. Iron nailShow ExplanationCorrect Answer: B. Candle. Candles burn with a flame due to the vaporization of wax. (Combustion and Flame MCQ by Top100MCQ.com) (adsbygoogle=window.adsbygoogle||[]).push({})

Question 46: What is the color of a candle flame?A. BlueB. YellowC. GreenD. RedShow ExplanationCorrect Answer: B. Yellow. Candle flames are typically yellow due to incomplete combustion. (Combustion and Flame MCQ by Top100MCQ.com)

Question 47: Which of these materials does not produce a flame when burned?A. KeroseneB. MagnesiumC. CharcoalD. CamphorShow ExplanationCorrect Answer: C. Charcoal. Charcoal does not vaporize and therefore does not produce a flame. (Combustion and Flame MCQ by Top100MCQ.com)

Structure of a Flame

Fuels

Question 63: Which of these is a solid fuel?A. PetrolB. KeroseneC. CoalD. LPGShow ExplanationCorrect Answer: C. Coal. Coal is a commonly used solid fuel. (Combustion and Flame MCQ by Top100MCQ.com)

Question 64: Which of these is a liquid fuel?A. WoodB. DieselC. Natural gasD. CharcoalShow ExplanationCorrect Answer: B. Diesel. Diesel is a liquid fuel used in vehicles. (Combustion and Flame MCQ by Top100MCQ.com) (adsbygoogle=window.adsbygoogle||[]).push({})

Question 65: Which of these is a gaseous fuel?A. CoalB. KeroseneC. CNGD. WoodShow ExplanationCorrect Answer: C. CNG. CNG (Compressed Natural Gas) is a gaseous fuel used in vehicles. (Combustion and Flame MCQ by Top100MCQ.com)

Fuel Efficiency

Question 70: Which of these fuels has the highest calorific value?A. Cow dung cakeB. WoodC. CoalD. LPGShow ExplanationCorrect Answer: D. LPG. LPG has a higher calorific value than the other fuels listed. (Combustion and Flame MCQ by Top100MCQ.com)

Question 3: Which of these fuels burns with a flame?
A. CoalB. CandleC. CharcoalD. Cow dung cake
Show Explanation
Correct Answer: B. Candle. Candles burn with a flame while others burn without a flame. (Combustion and Flame MCQ by Top100MCQ.com)

Question 4: Which of these is a combustible substance?
A. StoneB. GlassC. PaperD. Iron nail
Show Explanation
Correct Answer: C. Paper. Paper can burn, making it combustible. (Combustion and Flame MCQ by Top100MCQ.com)

Question 5: Which of these is a non-combustible substance?
A. WoodB. KeroseneC. MatchsticksD. Glass
Show Explanation
Correct Answer: D. Glass. Glass cannot burn, making it non-combustible. (Combustion and Flame MCQ by Top100MCQ.com)

Question 8: Which of these is a product of combustion?
A. WaterB. HeatC. OxygenD. Carbon
Show Explanation
Correct Answer: B. Heat. Combustion always produces heat. (Combustion and Flame MCQ by Top100MCQ.com)

Question 9: What gas is necessary for combustion to occur?
A. Carbon dioxideB. NitrogenC. OxygenD. Hydrogen
Show Explanation
Correct Answer: C. Oxygen. Oxygen is the key component of air that supports combustion. (Combustion and Flame MCQ by Top100MCQ.com)

Question 11: Which of these is a combustible substance?
A. GoldB. CharcoalC. GlassD. Water
Show Explanation
Correct Answer: B. Charcoal. Charcoal can burn in the presence of oxygen. (Combustion and Flame MCQ by Top100MCQ.com)

Question 12: What is the chemical process of burning called?
A. CondensationB. EvaporationC. CombustionD. Sublimation
Show Explanation
Correct Answer: C. Combustion. Combustion is the scientific term for burning. (Combustion and Flame MCQ by Top100MCQ.com)

Question 14: Which of these is a product of combustion?
A. OxygenB. NitrogenC. LightD. Water vapor
Show Explanation
Correct Answer: C. Light. Combustion often produces light, either as a flame or a glow. (Combustion and Flame MCQ by Top100MCQ.com)

Question 16: What happens when a substance undergoes combustion?
A. It meltsB. It reacts with oxygenC. It dissolvesD. It changes state
Show Explanation
Correct Answer: B. It reacts with oxygen. This reaction is the core of combustion. (Combustion and Flame MCQ by Top100MCQ.com)

Question 17: Which of these is a fuel?
A. IronB. GlassC. SandD. Petrol
Show Explanation
Correct Answer: D. Petrol. Petrol is a liquid fuel used in vehicles. (Combustion and Flame MCQ by Top100MCQ.com)

Question 25: Which of these is an example of an inflammable substance?
A. WoodB. CoalC. LPGD. Iron
Show Explanation
Correct Answer: C. LPG. LPG has a very low ignition temperature. (Combustion and Flame MCQ by Top100MCQ.com)

Question 27: What is the most common way to extinguish a fire?
A. Removing the fuelB. Adding more oxygenC. Increasing the temperatureD. Cooling down the fuel
Show Explanation
Correct Answer: D. Cooling down the fuel. This is typically done by using water. (Combustion and Flame MCQ by Top100MCQ.com)

Question 34: What is the most common fire extinguisher?
A. WaterB. Carbon dioxideC. FoamD. Dry powder
Show Explanation
Correct Answer: A. Water. It is readily available and effective for many types of fires. (Combustion and Flame MCQ by Top100MCQ.com)

Question 43: What is the color of an LPG flame?
A. RedB. YellowC. BlueD. Green
Show Explanation
Correct Answer: C. Blue. LPG flames are typically blue. (Combustion and Flame MCQ by Top100MCQ.com)

Question 44: Which of these materials produces a flame when burned?
A. CharcoalB. CandleC. CoalD. Iron nail
Show Explanation
Correct Answer: B. Candle. Candles burn with a flame due to the vaporization of wax. (Combustion and Flame MCQ by Top100MCQ.com)

Question 46: What is the color of a candle flame?
A. BlueB. YellowC. GreenD. Red
Show Explanation
Correct Answer: B. Yellow. Candle flames are typically yellow due to incomplete combustion. (Combustion and Flame MCQ by Top100MCQ.com)

Question 47: Which of these materials does not produce a flame when burned?
A. KeroseneB. MagnesiumC. CharcoalD. Camphor
Show Explanation
Correct Answer: C. Charcoal. Charcoal does not vaporize and therefore does not produce a flame. (Combustion and Flame MCQ by Top100MCQ.com)

Question 63: Which of these is a solid fuel?
A. PetrolB. KeroseneC. CoalD. LPG
Show Explanation
Correct Answer: C. Coal. Coal is a commonly used solid fuel. (Combustion and Flame MCQ by Top100MCQ.com)

Question 64: Which of these is a liquid fuel?
A. WoodB. DieselC. Natural gasD. Charcoal
Show Explanation
Correct Answer: B. Diesel. Diesel is a liquid fuel used in vehicles. (Combustion and Flame MCQ by Top100MCQ.com)

Question 65: Which of these is a gaseous fuel?
A. CoalB. KeroseneC. CNGD. Wood
Show Explanation
Correct Answer: C. CNG. CNG (Compressed Natural Gas) is a gaseous fuel used in vehicles. (Combustion and Flame MCQ by Top100MCQ.com)

Question 70: Which of these fuels has the highest calorific value?
A. Cow dung cakeB. WoodC. CoalD. LPG
Show Explanation
Correct Answer: D. LPG. LPG has a higher calorific value than the other fuels listed. (Combustion and Flame MCQ by Top100MCQ.com)