Class 8th Science Chapter – 4 Combustion and Flame
| Textbook | NCERT |
| Class | 8th |
| Subject | Science |
| Chapter | 4th |
| Chapter Name | Combustion and Flame |
| Category | Class 8th Science |
| Medium | English |
| Source | Last Doubt |
| Class 8th Science Chapter – 4 Combustion and Flame MCQ With Answer What are the 5 types of combustion?, How is flame formed?, What causes combustion?, Why is combustion important?, What is the Colour of LPG flame?, What are the 4 products of combustion?, What is the structure of a flame?, How hot is a flame?, Why is flame shaped?, What is the shape of the flame?, Is combustion good or bad?, What type of reaction is combustion?, Does combustion need heat? |
Class 8th Science Chapter – 4 Combustion and Flame
Chapter – 4
Combustion and Flame
MCQ
| (1) In the sun, light and heat are produced by ? A. chemical reactions B. nuclear reactions C. burning reactions D. bunsen burner Answer – (B) nuclear reactions |
| (2) Which of the following is combustible ? A. Stone piece B. Wood C. Glass D. None of these Answer – (B) Wood |
| (3) Combustible substances are also known as ? A. inflammable B. flaming C. illuminous D. non-flammable Answer – (A) inflammable |
| (4) The substance that undergoes combustion is said to be ? A. burning B. flame C. charcoal D. combustible Answer – (D) combustible |
| (5) Name the chemical process in which a substance reacts with oxygen to give out heat ? A. Reaction B. Junction C. Combustion D. All of these Answer – (C) Combustion |
| (6) Which of the following is an example of inflammable substance ? A. Iron B. Glass C. LPG D. Stone Answer – (C) LPG |
| (7) Substances that have very low ignition temperature and can catch fire easily are called ? A. flammable substances B. inflammable substances C. combustible substances D. all of these Answer – (D) all of these |
| (8) Which chemical is used in the rubbing surface provided for matchsticks ? A. Sulphur B. Gold C. Red phosphorus D. White phosphorus Answer – (C) Red phosphorus |
| (9) Long, long ago, which of the following trees was used to produce matchsticks ? A. Mango B. Deodar C. Banyan D. Pine Answer – (D) Pine |
| (10) Lowest temperature at which a substance catches fire is known as ? A. lowest temperature B. burning temperature C. ignition temperature D. flaming temperature Answer – (C) ignition temperature |
| (11) Phosphorus burns at ? A. room temperature B. 100°C C. cool temperature D. any temperature Answer – (A) room temperature |
| (12) LPG means ? A. Liquefied Petroleum Gas B. Liquefied Petrol Gas C. Liquid Petrol Godown D. Liquid Petroleum Gas Answer – (A) Liquefied Petroleum Gas |
| (13) Baking soda constitutes ? A. hydrogen chloride B. sodium oxide C. sodium bicarbonate D. oxygen Answer – (C) sodium bicarbonate |
| (14) The most common element used as fire extinguisher is ? A. CO2 B. oxygen C. phosphorus D. NO2 Answer – (A) CO2 |
| (15) Which of the following are required essentially for producing fire ? A. Glass, coal, water B. Fuel, coal, straw C. Fire, wood, burner D. Fuel, air, heat Answer – (D) Fuel, air, heat |
| (16) Which of the following is an inflammable substance ? A. Coal B. Alcohol C. Wood D. Stone Answer – (B) Alcohol |
| (17) Which of the following is non¬combustible substance ? A. Alcohol B. Coal C. Iron D. Wood Answer – (C) Iron |
| (18) Which of these is a combustible substance ? A. Asbestos B. Paper C. Stone D. Sand Answer – (B) Paper |
| (19) The calorific value of ‘hydrogen’ is ? A. 50,000 kJ/kg B. 55,000 kJ/kg C. 1,50,000 kJ/kg D. 6,000 kJ/kg Answer – (C) 1,50,000 kJ/kg |
| (20) ‘Firework’ is an example of ? A. rapid combustion B. explosion C. spontaneous combustion D. slow combustion Answer – (B) explosion |
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