Question

1. Which fuel is used for running automobiles?

a) Wood b) Coal c)Diesel d)Charcoal

2. When magnesium ribbon burnt it produce

a) Magnesium hydroxide b) Magnesium oxide

c) Magnesium chloride d) Magnesium sulphate

3. Charcoal burns in air producing-

a) CO2 b)CO c)H2 d)O2

4. Combustion is a reaction in which a Substance reacts with-

a) Hydrogen b) Nitrogen c) Oxygen d) Chlorine

5. Fuel may be-

a)Solid b)Liquid c) Gas d)All of these

6. Which one of the following is fuel of our body?

a) Petrol b) Diesel c) Food d) Water

7. Combustion is a-

a) Physical process b) Chemical process

c) Both (a) & (b) d)None of these

8. Which one of the following is combustible?

a) Iron nail b)Glass c)Stone pieces d)Paper





9. The lowest temperature at which a Substance catches fire is called its-

a) Boiling point b) Melting point

c) Ignition temperature d) Critical temperature

10. Which of the following has lower ignition temperature?

a)Wood b) Paper c)Veg​

Answer 1

Answer:

1. diseal

2.magnesium oxide

3.Co2

4.nitrogen

5.not know liquid or all of these

6.water

7.chemical process

8.not know

9.i think critical

10.

veg

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Answer 2

1. c) diesel

2. a) magnesium hydroxide.

3. a) CO2

4. c) Oxygen

5.d) all of thse. ( diesel for cars, coal for steam engine and air co2 for speed.)

6.c) food

7.a) physical process

8. c) stone pieces

9.a) boiling point

10.a) wood

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