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Q 1. Soot is given by
burnt ‘C’ particles
unburnt ‘C’ particles
Both
None
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Q 2. Which of the following is not a necessary condition of combustion?
Presence of combustible substance
Presence of supporter of combustion
Attainment of ignition temperature of the fuel
Presence of carbon dioxide
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Q 3. The main source of sun light is
Nuclear fission
Nuclear fusion
Both
None of these
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Q 4. Isotope of ________is used as source of sun light.
Hydrogen
Oxygen
Chlorine
Lithium
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Q 5. The lowest temperature at which a substance catches fire is called as________
Ignition temperature
Different temperature
Same temperature
All temperature
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Q 6. The most combustible substance in matchstick is
{tex}P_{white}{/tex}
{tex}Sb_{2}S_{3}{/tex}
{tex}KClO_{3}{/tex}
All
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Q 7. Powdered glass and a little red phosphorus is present on ________of safety matchstick
Head
Rubbing surface
Both
None of these
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Q 8. Which zone produces yellow light during burning of candle?
Non-Luminous zone
Dark zone
Luminous zone
Blue zone
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Q 9. In Luminous zone of candle flame
Partial combustion takes place
Complete combustion takes place
both may be
None of these
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Q 10. The black colour of candle flame is due to
Sulphur
Carbon
{tex}CO_{2}{/tex}
CO
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Q 11. The coldest zone of candle wick is
Dark zone
Blue zone
Red zone
Yellow zone
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Q 12. What are the products of burning of magnesium?
MgO and heat
MgO, heat and light
MgO
None
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Q 13. Which one of the following has the highest calorific value?
{tex}H_{2}{/tex}
Wax
Candle
All of these
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Q 14. Which one is considered to be the most cleaner fuel
Bio gas
Marsh gas
C.N.G.
Petrol
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Q 15. Fischer tropsch process involves
Conversion of natural gas to liquid
Catalyst-iron and cobalt
High temperature 150-300°
All of these
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Q 16. Which of the following substances has the lowest ignition temperature ?
kerosene
spirit
diesel
mustard oil
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Q 17. Which of the following undergoes spontaneous combustion?
yellow sulphur
red phosphorus
white phosphorus
brown sulphur
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Q 18. Which of the following statement is not correct about carbon dioxide acting as a fire extinguisher for electrical fibers?
it is heavier than air
it is lighter than air
it is not combustible
it does not support combustion
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Q 19. On a cold winter night, the persons sleeping in a room with closed door and windows with a coal fire burning inside may die due to the excessive accumulation of
nitrogen monoxide
nitrogen dioxide
carbon dioxide
carbon monoxide
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Q 20. Which of the following fuels has the lowest calorific value?
Kerosene
CNG
Biogas
LPG
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Q 21. Which of the following gas does not contribute to the formation of acid rain?
nitrogen monoxide
carbon monoxide
sulphur dioxide
nitrogen dioxide
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Q 22. If the clothes of a person working in the kitchen catch fire, then to extinguish the fire.
sand should be thrown over the burning clothes
water should be thrown over the burning clothes
polyester blanket should be used to cover the burning clothes
woollen blanket should be used to cover the burning clothes
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Q 23. Which process is similar to that of a burning candle except for the difference in temperature?
Transpiration
Respiration
Evaporation
Sublimation
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Q 24. Which is the most common substance that can be used to put out fires ?
Wood
Petrol
Sand
Kerosene
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Q 25. Arrange the following fuels in order of their calorific value starting from lower to higher-
LPG, Kerosene, Petrol, Hydrogen
Petrol, Kerosene, LPG, Hydrogen
Petrol, LPG, Hydrogen, Kerosene
Kerosene, Petrol, LPG, Hydrogen