NCERT Class VIII Science Solutions: Chapter 6-Combustion and Flame Part 1 (For CBSE, ICSE, IAS, NET, NRA 2023)
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MULTIPLE CHOICE QUESTIONS
Question 1:
A substance which reacts with oxygen giving heat is called a combustible substance. Which, one of the following is a combustible substance?
- Iron nail
- Glass
- Stone piece
- Wood
Answer: D
Question 2:
Which one of the following has the highest calorific value?
- Kerosene
- Biogas
- LPG
- Petrol
Answer: C
Question 3:
Magnesium ribbon on burning in air produces
- Magnesium oxide, water and light
- Magnesium oxide and heat
- Magnesium oxide, heat and light
- Magnesium oxide, water and heat
Answer: C
Question 4:
Which of the following is not a combustible substance?
- Camphor
- Glass
- Straw
- Alcohol
Answer: B
Question 5:
The substance that does not burn with flame is
- LPG
- Camphor
- Dry grass
- Charcoal
Answer: D
Question 6:
On placing an inverted tumbler over a burning candle, the flame extinguishes after some time. This is because of non-availability of
- Oxygen
- Water vapours
- Carbon dioxide
- Wax
Answer: A
Question 7:
If a person՚s clothes catches fire, the best way to extinguish the fire is to:
- Throw water on the clothes.
- Use fire extinguisher.
- Cover the person with a woolen blanket.
- Cover the person with a polythene sheet.
Answer: C