Questions :-

1. Petrol and matchstick are examples of ____________
(a) Rapid combustion
(b) Spontaneous combustion
(c) Explosion
(d) None of these

2. Name the combustion in which sudden reactions take place on ignition to produce heat, light, and sound.
(a) Rapid combustion
(b) Spontaneous combustion
(c) Explosion
(d) None of these

3. Fire cracker and bomb are examples of ____________
(a) Rapid combustion
(b) Spontaneous combustion
(c) Explosion
(d) None of these

4. Name the combustion in which material suddenly bursts into flames, without any apparent cause.
(a) Rapid combustion
(b) Spontaneous combustion
(c) Explosion
(d) None of these

5. Phosphorous and sulphur is an example of __________
(a) Rapid combustion
(b) Spontaneous combustion
(c) Explosion
(d) None of these

6. Which is the hottest part of candle flame?
(a)Outer zone or non – luminous zone
(b)Middle zone or luminous zone
(c)Innermost zone or dark zone
(d)None of these

7. Which zone is known as dark zone?
(a) Outer zone
(b) Middle zone
(c) Innermost zone
(d)None of these

8.Increased concentration of carbon dioxide cause _____________
(a) Global warming
(b) Acid rain
(c) Respiratory diseases
(d) None of these

9. Carbon fuels like wood, coal, petroleum causing _________
(a) Global warming
(b) Acid rain
(c) Respiratory diseases
(d) None of these

10. What is the S.I. unit of calorific value?
(a) Kilo joule/ kg
(b) Joule/kg
(c) Kilo joule/ gram
(d) None of these