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- 1. Multiple Choice
Which substance give heat and light after combustion
Flame
Fuel
Combustion
None of these
- 2. Multiple Choice
Coal burns with ____________________________
Flame
Only glow
Both flame and glow
None of these
- 3. Multiple Choice
Burning of charcoal in a closed room will produce
Carbon dioxide
Nitrogen dioxide
Carbon monoxide
Sulphur dioxide
- 4. Multiple Choice
The substances which have very low ignition temperature will
Catch fire easily
Will not catch fire
Catch fire after some time
None of these
- 5. Multiple Choice
Ignition temperature is
Lowest temperature at catch fire
Higher temperature at catch fire
Any temperature
1000 C
- 6. Multiple Choice
Combustion is a
Natural process
Chemical process
Physical process
None of these processes
- 7. Multiple Choice
When magnesium ribbon burnt it produce
Magnesium hydroxide
Magnesium oxide
Magnesium chloride
Magnesium sulphate
- 8. Multiple Choice
Which one of the following is combustible?
Iron nail
Glass
Stone pieces
Paper
- 9. Multiple Choice
Which of the following is inflammable Substances?
Petrol
Wood
Paper
Straw
- 10. Multiple Choice
In the presence of water, ignition Temperature of paper is-
Decrease
Increase
Remain constant
None of these
- 11. Multiple Choice
Which is the hottest part in the flame of the candle
Yellow
Wax part
Black
Blue
- 12. Multiple Choice
Fire extinguisher-
Raise up temperature of fuel
Bring down the temperature of fuel
Cut off the supply of air
None of these
- 13. Multiple Choice
Good fuel is
Readily available
Cheap
Burn easily in air
All of these
- 14. Multiple Choice
Ideal fuel has ____________ calorific value
Zero
Low
Moderate
High
- 15. Multiple ChoiceWhich type of fire extinguisher should be used on a fire involving flammable liquids such as grease or oil?WaterCarbon DioxideDry ChemicalFoam
- 16. Multiple ChoiceWater is not used to control fires involving electrical appliances.FalseTrue
- 17. Multiple ChoiceWhich of the following fuel has highest calorific value?WoodcoalHydrogenpetrol
- 18. Multiple Choice
8.7: Combustion is when a __________ reacts with oxygen
petrol
fuel
fire triangle
carbon dioxide
- 19. Multiple Choice
he picture below shows two cases in which a person is trying to burn the paper cup. In case 1, the cup has water in it and in case 2, it is empty and dry. Identify in which of the cases the paper will burn.
Case 1
case 2
Both case 1 and case 2
D. The paper doesn’t burn in both the cases.
- 20. Multiple Choice
Moderately hot zone in a candle flame
outer zone
middle zone
innermost zone
wax candle
- 21. Multiple Choice
The least hot zone of a candle flame is
non-lumious zone
luminous
dark zone
blue zone at the base of the wick
- 22. Multiple Choice
What colours are the outer zone of the flame? (Pick two)
Colourless
Blue
Red
Orange
- 23. Multiple Choice
What does this hazard symbol warn of?
The substance is explosive
The substance burns easily
The substance supplies oxygen to fires
The substance puts out fires
- 24. Multiple Choice
Which of the following chemical reactions involve combustion?
A forest fire
Human digestion
A car using petrol
All of the above
- 25. Multiple ChoiceIs the combustion reversableYes.No.
- 26. Multiple ChoiceA fuel is:a substance formed from living organisms that lived a long time agoa substance that explodesa substance that contains hydrocarbonsa substance that transfers energy usefully, usually by heating.
- 27. Multiple Choice
Why should you not add water on burning oil?
It makes the fire explode and spread.
It puts the fire out too quickly
Water does not put out fires
It takes too long to put out the fire
- 28. Multiple ChoiceComplete combustion is when there is plenty of oxygen to react with.TrueFalse
- 29. Multiple ChoiceWood is a better fuel than LPG.TrueFalse
- 30. Multiple ChoiceWhich type of fire extinguisher should be used on a fire involving flammable liquids such as grease or oil?WaterCarbon DioxideDry ChemicalFoam
- Answer choicesTagsAnswer choicesTags