Q 1 – Which of the following fuel produces ash on burning:
(a) wood
(b) LPG
(c) petrol
(d) diesel
Ans. (a) wood
Wood produces ash on burning.
Q 2 – The zone of a flame used by goldsmith for melting gold and silver is:
(a) innermost zone
(b) middle zone
(c) outermost zone
(d) all of these
Ans. (c) outermost zone
The zone of a flame used by goldsmith for melting gold and silver is outermost zone
because it is the hottest zone.
Q 3 – Can the process of rusting he called combustion?
(a) yes
(b) no
(c) can’t say
(d) none of these
Ans. (a) yes
Yes, the process of rusting can be called combustion because it produces heat
Q 4 – Is heat and light produced by Sun a combustion process?
(a) yes
(b) no
(c) can’t say
(d) none of these
Ans. (b) no
No, heat and light produced by sun is not a combustion process.
Q 5 – Heat and light produced in the sun is by:
(a) combustion
(b) nuclear reactions
(c) burning
(d) none of these
Ans. (b) nuclear reactions
Heat and light produced in the sun is by nuclear reactions.
Q 6 – Ignition temperature is the:
(a) temperature at which a substance catches fire
(b) highest temperature at which a substance catches fire
(c) lowest temperature at which a substance catches fire
(d) none of these
Ans. (c) lowest temperature at which a substance catches fire
Ignition temperature is the lowest temperature at which a substance catches fire
Q 7 – Which of them can be easily burnt with the help of a matchstick?
(a) wooden chips
(b) straw
(c) wooden log
(d) all of them
Ans. (b) straw
Straw can be easily burnt with the help of a matchstick because the ignition temperature of
straw is very less and heat produced from lighted matchstick is more than the ignition
temperature of straw and therefore it starts burning
Q 8 – A matchstick does not catch fire on its own at room temperature because it:
(a) ignition temperature is more than room temperature
(b) ignition temperature is less than room temperature
(c) ignition temperature is same as room temperature
(d) none of these
Ans. (a) ignition temperature is more than room temperature
A matchstick does not catch fire on its own at room temperature because its ignition
temperature is more than room temperature.
Q 9 – Which of the following gas extinguishes fire:
(a) oxygen
(b) hydrogen
(c) carbon dioxide
(d) nitrogen
Ans. (c) carbon dioxide
Carbon dioxide gas extinguishes fire.
Q 10 – Combustion that takes place at a very fast rate is called:
(a) rapid combustion
(b) spontaneous combustion
(c) explosion
(d) none of these
Ans. (a) rapid combustion
Combustion that takes place at a very fast rate is called rapid combustion.
Q 11 – The coldest zone of candle is:
(a) the middle zone
(b) the innermost zone
(c) the outermost zone
(d) none of these.
Ans. (b) the innermost zone
The coldest zone of candle is the innermost zone.
Q 12 – Smoke contains:
(a) unburnt carbon particles
(b) burnt carbon particles
(c) unburnt sulfur particles
(d) unburnt lead particles
Ans. (b) burnt carbon particles
Smoke contains unburnt carbon particles.
Q 13 – The color of the non-luminous zone is:
(a) white
(b) yellow
(c) blue
(d) black
Ans. (c) blue
The color of the non-luminous zone is blue.
Q 14 – Which of the following fuel has the highest calorific value:
(a) cow dung cake
(b) Wood
(c) coal
(d) Petrol
Ans. (d) Petrol
Petrol has higher calorific value than petrol.
Q 15 – The fuel which replaces use of diesel and petrol as fuels in automobiles is:
(a) LPG
(b) biogas
(c) CNG
(d) none of these
Ans. (c) CNG
CNG has replaced use of diesel and petrol as fuels in automobiles because it is non-pollutant fuel.
Q 16 – Which of following does not produce flame on burning:
(a) LPG
(b) charcoal
(c) paper
(d) kerosene
Ans. (b) charcoal
LPQ paper and kerosene produces flame on burning whereas charcoal does not produce
flame on burning.
Q 17 – Which of the following is best fuel for automobiles:
(a) petrol
(b) CNG
(c) diesel
(d) kerosene
Ans. (b) CNG
CNG is best fuel for automobiles as it produces pollutants in very small amounts.
Q 18 – which of the following causes global warming:
(a) carbon dioxide
(b) carbon monoxide
(c) nitrogen dioxide
(d) none of these
Ans. (a) carbon dioxide
Carbon dioxide causes global warming.
Q 19 – The unit of calorifie virtue is:
(a) kilojoules per kg
(b) joules per kg
(c) kilojoules per grain
(d) joules per gram
Ans. (a) kilojoules per kg
The unit of calorific value is Kilojoules per kg.
Q 20 – The hottest zone of candle flame is:
(a) outermost zone
(b) in memos zone
(c) middle zone
(d) all of these
Ans. (a) outermost zone
The hottest zone of candle flame is outermost zone
Q 21 – A chemical process in which a substance reacts with oxygen to give off heat is called.
(a) reduction
(b) evaporation
(c) combustion
(d) none of these
Ans. (c) combustion
Combustion is a chemical process in which a substance reacts with oxygen to give off heat.
Q 22 – Which of the following burns with flame:
(a) coal
(b) cow dung
(c) candle
(d) all of these
Ans. (c) candle
Candle burns with a flame, coal, cow dung does not burn with a flame.
Q 23 – Magnesium burns in air to form
(a) magnesium oxide
(b) heat
(c) light
(d) all of these
Ans. (d) all of these
Magnesium bums in air to form magnesium oxide, heat, and light.
Q 24 – Which of the following substance is not combustible:
(a) matchstick
(b) straw
(c) charcoal
(d) glass
Ans. (d) glass
Glass is not combustible. Matchstick, straw, and charcoal are combustible.
Q 25 – In which of the following conditions combustion takes place:
(a) the presence of a combustible substance
(b) the presence of air with sufficient amount of oxygen
(c) the temperature of combustible substance should be more than its ignition temperature
(d) all the above conditions are necessary
Ans. (d) all the above conditions are necessary
The conditions under which combustion takes place in the presence of a combustible
substance, air with a sufficient amount of oxygen, and ignition temperature of the
combustible substance
Q 26 – Which of the following is smoke-free fuel:
(a) wood
(b) LPG
(c) charcoal
(d) coal
Ans. (b) LPG
LPG is smoke-free fuel, wood, charcoal, and coal produce smoke on burning.
Q 27 – Coal mainly contains:
(a) carbon
(b) nitrogen and Sulphur
(c) carbon, hydrogen, and nitrogen
(d) none of these
Ans. (a) carbon
Coal mainly contains carbon.
Q 28 – Which poisonous gas is formed as a result of incomplete combustion?
(a) carbon monoxide
(b) coal gas
(c) carbon dioxide
(d) nitrogen oxide
Ans. (a) carbon monoxide
The poisonous gas formed as a result of incomplete combustion is carbon monoxide.
Q 29 – The natural solid fuel is:
(a) coal
(b) charcoal
(c) coke
(d) LPG
Ans. (a) coal
The natural solid fuel is coal.
Q 30 – Which of the following give us pollution free environment on burning:
(a) wood
(b) kerosene
(c) cow dung cakes
(d) biogas
Ans. (d) biogas
Biogas gives us pollution free environment on burning.
Q 31 – Match the Column-A with Column-B :
| Column-A | Column-B |
| (a) Charcoal | (i) Inflammable substance |
| (b) Iron nails | (ii) Combustible substance |
| (c) Petrol | (iii) Non-combustible substance |
Ans.
| Column-A | Column-B |
| (a) Charcoal | (ii) Combustible substance |
| (b) Iron nails | (iii) Non-combustible substance |
| (c) Petrol | (i) Inflammable substance |
Q 32 –
| Column-A | Column-B |
| (a) Rapid Combustion | (ii) When gas burns rapidly and produces heat and light. |
| (b) Spontaneous Combustion | (iii) When a material suddenly bursts into flames, without, the application of any apparent cause |
| (c) Explosion | (iii) When a material suddenly bursts into flames, without, the application of any apparent cause |
Ans.
| Column-A | Column-B |
| (a) Rapid Combustion | (i) When a sudden reaction takes place with the evolution of heat, light, sound and large amount of gas. |
| (b) Spontaneous Combustion | (ii) When gas burns rapidly and produces heat and light. |
| (c) Explosion | (iii) When a material suddenly bursts into flames, without, the application of any apparent cause |
Q 33 –
| Column-A | Column-B |
| (a) Ignition temperature | (i) The substances which burn in air. |
| (b) Combustion | (ii) Substances having very low ignition temperature. |
| (c) Inflammable substances | (iii) The lowest temperature at which a combustible substance catches fire. |
Ans.
| Column-A | Column-B |
| (a) Ignition temperature | (iii) The lowest temperature at which a combustible substance catches fire. |
| (b) Combustion | (i) The substances which burn in air. |
| (c) Inflammable substances | (ii) Substances having very low ignition temperature. |
Q 34 – State whether the following statements are True or False:
- Unburnt carbon particles in air are dangerous pollutants causing respiratory problems. True
2. Decreased percentage of carbon dioxide in air has been linked to global warming. False
3. Water can be used to control fires involving electrical equipment or oils False
4. LPG is a better domestic fuel than wood. True
5. In the sun heat and light are produced by nuclear reactions. True
6. Coal is not a fossil fuel. False
7. Wildlife and minerals are exhaustible natural resources. True
8. Coal mainly contains hydrogen. False
9. Petroleum is a dark oily liquid. True
10. CNG is Compressed Natural Gas. True
11. LPG has more calorific value than wood True
12. A goldsmith use the middle zone of a flame for melting gold, and silver False
13. The hottest zone of the flame is outermost zone. True
14.A piece of charcoal burns in air and produces carbon monoxide. False
15. The ignition temperature of wood is lower than that of kerosene oil. False
Q 35 – Fill in the blanks:
1. Burning of wood and coal causes …………………… of air.
Ans. pollution
2.The unit of calorific value of a fuel is ……………………
Ans. kilojoules/kilogram
3. Cement is a …………………… substance.
Ans. non-combustible substance
4. The slow process of conversion of dead vegetation into coal is called ……………………
Ans. carbonization
6.…………………… is a tough, porous, and black substance.
Ans. Coke
7. A combustible substance cannot catch fire or bum as long as its temperature is lower than
its …………………… temperature
Ans. ignition
8. The three essential requirements for producing fire are ……………………, …………………… and
……………………
Ans. fuel, air, heat
9. LPG is …………………… …………………… ……………………
Ans. Liquefied Petroleum Gas
10. Process of separation of different constituents from petroleum is called …………………….
Ans. refining
11.…………………… is the rise in temperature of the environment of the earth
Ans. Global warming
12. A liquid fuel, used in homes is ……………………
Ans. kerosene
13. Fuel must be heated to its …………………… before it starts burning.
Ans. ignition temperature
14. Fire produced by oil cannot be controlled by ……………………
Ans. water
15. Fuels are stores of energy which of burning give …………………… and …………………….
Ans. heat and light
16. The color of outermost zone is ……………………
Ans. blue
17. The color of innermost zone of the flame is …………………….
Ans. dark
18. Fire brigade uses …………………… to extinguish the fire.
Ans. water
19. Incomplete combustion of fuel gives poisonous …………………… gas.
Ans. carbon monoxide
20. Inflammable substances have very …………………… ignition temperature.
Ans. low
21. The substances which burn in air are called ……………………
Ans. combustible
Q34 – Which one of the following gases is used in combustion?
(a) Hydrogen
(b) Oxygen
(c) Nitrogen
(d) Carbon dioxide
Ans. (b) Oxygen
Q 36– The burning of LPG is an example of
(a) rapid combustion
(b) spontaneous combustion
(c) slow combustion
(d) explosion
Ans. (a) rapid combustion
Q 37– A temperature at which the substance burns is called
(a) melting
(b) boiling temperature
(c) kindling temperature
(d) evaporation
Ans. (c) kindling temperature
Q 38– Which is non-renewable source of energy?
(a) Natural gas
(b) Wind energy
(c) Tidal energy
(d) Mechanical energy
Ans. (a) Natural gas
Q 39– Which of the following is not a fossil fuel?
(a) Coal
(b) Petroleum
(c) Natural gas
(d) Water gas
Ans. (d) Water-gas
Q 40 – Which gas helps in the process of combustion?
(a) Cooking gas
(b) Nitrogen gas
(c) Oxygen gas
(d) Producer gas
Ans. (c) Oxygen gas
Q 41 – The amount of heat energy produced on complete combustion of 1 kg of a fuel is called
(a) calorific value
(b) significant value
(c) heat value
(d) internal energy
Ans. (a) calorific value
Q 42 – Which zone represents the partial combustion in candle flame?
(a) Outer zone
(b) Middle zone
(c) Inner zone
(d) Lower zone
Ans. (b) Middle zone
Q 43 – Burning coal in a closed room will produce
(a) nitrogen oxides
(b) carbon dioxide
(c) carbon monoxide
(d) oxygen
Ans. (c) carbon monoxide
Q 44 – Substances which catch fire are called
(a) acids
(b) bases
(c) combustible
(d) burners
Ans. (c) combustible
Q 45 – Out of these, which is able to control fires?
(a) NH3
(b) H2
(c) CO2
(d) F2
Ans. (c) CO2
Q 46 – Which zone of a flame does a goldsmith use for melting gold and silver?
(a) Outer zone
(b) Middle zone
(c) Inner zone
(d) Lower zone
Ans. (a) Outer zone
Q 47– Calorific value of a fuel is expressed in
(a) kilojoule per kilogram
(b) kilojoule per gram
(c) joule per milligram
(d) kilojoule per milligram
Ans. (a) kilojoule per kilogram
Q 48 – Which is non-combustible substance?
(a) Wood
(b) Paper
(c) Iron nails
(d) Straw
Ans. (c) Iron nails
Q 49– Acid rain contains mainly
(a) oxygen and nitrogen gas
(b) fluorine and chlorine gas
(c) magnesium oxide
(d) nitrogen oxide and sulphur dioxide
Ans. (d) nitrogen oxide and sulphur dioxide
Q 50 – Which of the following fuels is used for running automobiles?
(a) CNG
(b) Petrol
(c) Both (a) and (b)
(d) Wood
Ans. (c) Both (a) and (b)
Q 51 – Magnesium burns to form
(a) calcium carbonate
(b) magnesium oxide
(c) calcium oxide
(d) magnesium sulphate
Ans. (b) magnesium oxide
Q 52 – Coal burns to produce
(a) calcium bicarbonate
(b) magnesium
(c) carbon dioxide
(d) oxygen
Ans. (c) carbon dioxide
Q 53 – Name the chemical process in which a substance reacts with oxygen to give out heat.
(a) Reaction
(b) Junction
(c) Combustion
(d) All of these
Ans. (c) Combustion
Q 54– The substance that undergoes combustion is said to be
(a) burning
(b) flame
(c) charcoal
(d) combustible
Ans. (d) combustible
Q 55 – Combustible substances are also known as
(a) inflammable
(b) flaming
(c) illuminous
(d) non-flammable
Ans. (a) inflammable
Q 56 – Which of the following is combustible?
(a) Stone piece
(b) Wood
(c) Glass
(d) None of these
Ans. (b) Wood
Q 57 – In the sun, light, and heat are produced by
(a) chemical reactions
(b) nuclear reactions
(c) burning reactions
(d) bunsen burner
Ans. (b) nuclear reactions
Q 58 – Lowest temperature at which a substance catches fire is known as
(a) lowest temperature
(b) burning temperature
(c) ignition temperature
(d) flaming temperature
Ans. (c) ignition temperature
Q 59– Long, long ago, which of the following trees was used to produce matchsticks?
(a) Mango
(b) Deodar
(c) Banyan
(d) Pine
Ans. (d) Pine
Q 60 – Which chemical is used in the rubbing surface provided for matchsticks?
(a) Sulphur
(b) Gold
(c) Red phosphorus
(d) White phosphorus
Q 61 – Ans. Substances that have very low ignition temperature and can catch fire easily are called
(a) flammable substances
(b) inflammable substances
(c) combustible substances
(d) all of these
Ans. (d) all of these
Q 62 – Which of the following is an example of inflammable substance?
(a) Iron
(b) Glass
(c) LPG
(d) Stone
Ans. (c) LPG
Q 63 – (a) Glass, coal, water
(b) Fuel, coal, straw
(c) Fire, wood, burner
(d) Fuel, air, heat
Ans. (d) Fuel, air, heat
Q 64 – The most common element used as fire extinguisher is
(a) CO2
(b) oxygen
(c) phosphorus
(d) NO2
Ans. (a) CO2
Q 65 – Baking soda constitutes
(a) hydrogen chloride
(b) sodium oxide
(c) sodium bicarbonate
(d) oxygen
Ans. (c) sodium bicarbonate
Q 66 – LPG means
(a) Liquefied Petroleum Gas
(b) Liquefied Petrol Gas
(c) Liquid Petrol Godown
(d) Liquid Petroleum Gas
Ans. (a) Liquefied Petroleum Gas
Q67 – Phosphorus burns at
(a) room temperature
(b) 100°C
(c) cool temperature
(d) any temperature
Ans. (a) room temperature
Q 68 – ‘Firework’ is an example of
(a) rapid combustion
(b) explosion
(c) spontaneous combustion
(d) slow combustion
Ans. (b) explosion
Q 69 – The calorific value of ‘hydrogen’ is
(a) 50,000 kJ/kg
(b) 55,000 kJ/kg
(c) 1,50,000 kJ/kg
(d) 6,000 kJ/kg
Ans. (c) 1,50,000 kJ/kg
Q 70 – Which of these is a combustible substance?
(a) Asbestos
(b) Paper
(c) Stone
(d) Sand
Ans. (b) Paper
Q 71 – Which of the following is non¬combustible substance?
(a) Alcohol
(b) Coal
(c) Iron
(d) Wood
Ans. (c) Iron
Q 72 – Which of the following is an inflammable substance?
(a) Coal
(b) Alcohol
(c) Wood
(d) Stone
Ans. (b) Alcohol
Q 73 – A flame has
(a) one zone
(b) two zones
(c) three zones
(d) four zones
Ans. (c) three zones
Q 74 – The outermost zone of flame is in color.
(a) blue
(b) orange
(c) brown
(d) dark
Ans. (a) blue
Q 75 – Which of the following does not produce flame while burning?
(a) Wax
(b) Petrol
(c) Diesel
(d) Coal
Ans. (d) Coal
Q 76 – Combustion is a
(a) chemical process
(b) physical process
(c) both of these
(d) none of these
Ans. (a) chemical process
Q 77 – The lowest temperature at which a substance catches fire is called its
(a) boiling point
(b) melting point
(c) ignition temperature
(d) critical temperature
Ans. (c) ignition temperature
Q 78 – In the presence of water, ignition temperature of paper
(a) decreases
(b) increases
(c) remains constant
(d) none of these
Ans. (b) increases
Q 79 – Rapid combustion occurs when
(a) gas bums and produces heat and light
(b) material suddenly bursts into flames
(c) there is evolution of heat
(d) none of these
Ans. (a) gas bums and produces heat and light
Q 80 – Explosion involves the evolution of
(a) heat
(b) light
(c) sound
(d) all of these
Ans. (d) all of these
Q 81 – A substance which vaporises during burning gives
(a) sound
(b) flame
(c) combustion
(d) none of these
Ans. (b) flame
Q 82 – The most common fire extinguisher is
(a) water
(b) carbon dioxide
(c) oxygen
(d) hydrogen
Ans. (a) water
Q 83 – Unburnt carbon particles cause
(a) stomach infections
(b) respiratory problems
(c) brain infections
(d) throat problems
Ans. (b) respiratory problems
Q 84 – In the Sun, heat, and light are produced by
(a) chemical reactions
(b) nuclear reactions
(c) ionic reactions
(d) none of these
Ans. (b) nuclear reactions
Q 85 – The head of the safety match contains
(a) antimony trisulphate
(b) potassium chlorate
(c) both (a) and (b)
(d) none of these
Ans. (c) both (a) and (b)
Q 86 – When a matchstick is struck against the rubbing surface, red phosphorus
(a) converts into white phosphorus
(b) reacts with potassium chlorate
(c) ignites antimony trisulphide
(d) none of these
Ans. (a) converts into white phosphorus
Q 87 – The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its
(a) combustion value
(b) calorific value
(c) ignition value
d None of these
Ans. (b) calorific value
Q 88 – Fuel maybe
(a) Solid only
(b) Solid, Liquid or gas
(c) Liquid only
(d) Gas only
Ans. (b) Solid,Liquid or gas
Q 89 – Which of the following has the characteristics of a good fuel?
(a) Coke
(b) Butane
(c) Coal
(d) Kerosene
Ans. (b) Butane
. Q 90 – Combustion is a _____ chemical reaction:
(a) volatile
(b) exothermic
(c) endothermic
(d) none of the above
Ans. (b) exothermic
Q 91 – The substances which give heat and light after combustion are called
(a) flame
(b) fuel
(c) combustion
(d) none of these
Ans. (b) fuel
Q 92 –.Cutting trees at large scale leads to :
(a) deforestation
(b) afforestation
(c) reforestation
(d) both deforestation & afforestation
Ans. (a) deforestation
. Q 93 – Cutting trees at large scale leads to :
(a) deforestation
(b) afforestation
(c) reforestation
(d) both deforestation & afforestation
Ans. (a) deforestation
Q 94 – What kind of reaction is combustion?
(a) Reduction
(b) Redox
(c) Substitution
(d) Oxidation
Ans. (d) Oxidation
Q 95 – Substance that burns in oxygen to produce heat and light is called :
(a) renewable
(b) non-combustible
(c) combustible
(d) limitless
Ans. (c) combustible
Q 96 – Substance that burns in oxygen to produce heat and light is called :
(a) renewable
(b) non-combustible
(c) combustible
(d) limitless
Ans. (c) combustible
Q 97 – Substance that burns in oxygen to produce heat and light is called :
(a) renewable
(b) non-combustible
(c) combustible
(d) limitless
Ans. (c) combustible
. Q 98 – Burning of LPG is an example of :
(a) slow combustion
(b) spontaneous combustion
(c) Both slow combustion & spontaneous combustion
(d) rapid combustion
Ans. (d) rapid combustion
Q 99 – SI unit of the calorific value of a fuel is:-
(a) KJ/kg
(b) KW/kg
(c) N/kg
(d) KJ/g
Ans. (a) KJ/kg
Q 100 – Burning of charcoal in a closed room will produce
(a) carbon dioxide
(b) nitrogen dioxide
(c) carbon monoxide
(d) all of these
Ans. (c) carbon monoxide
Q 101 – The gas which supports combustion of coal is :
(a) carbon dioxide
(b) oxygen
(c) nitrogen
(d) hydrogen
Ans. (b) oxygen
Q 102 –. Amount of heat energy produced on complete combustion of 1kg of fuel is called :
(a) energy value
(b) combustion value
(c) heat value
(d) calorific value
Ans. (d) calorific value.
Q 103 – Combustion is a
(a) chemical process
(b) physical process
(c) both of these processes
(d) none of these processes
Ans. (a) chemical process
. Q 104 – A material that burns is one that can combine quickly with :
(a) hydrogen
(b) oxygen
(c) carbon
(d) water
Ans. (b) oxygen
. Q 105 – Waterworks as a fire extinguisher by removing:-
(a) source of combustible substance
(b) heat
(c) oxygen
(d) both oxygen & heat
Ans. (d) both oxygen & heat
. Q 106 – What is the lowest temperature at which a substance starts burning called?
(a) Minimum temperature
(b) Maximum temperature
(c) Boiling temperature
(d) Ignition temperature
Ans (d) Ignition temperature.
Q 107 –. It is dangerous to extinguish fire caused by an electric short circuit with the use of :
(a) sand
(b) carbon dioxide
(c) water
(d) carbon monoxide
Ans (c) water
. Q 108 – Substance that does not burn in air is :
(a) sand
(b) kerosene
(c) wood
(d) diesel
Ans (a) sand
Q 109 – No external heat is required to start :
(a) simultaneous combustion
(b) spontaneous combustion
(c) splendid combustion
(d) spreading fire combustion
Ans (b) spontaneous combustion
Q 110 – CNG and LPG are the examples of
(a) solid fuels
(b) liquid fuels
(c) gaseous fuels
(d) they are not fuels
Ans (c) gaseous fuels
. Q 111 – Which of the following is a non-combustible substance?
(a) Coke
(b) Diamond
(c) Coal
(d) Wood
Ans (b) Diamond
Q 112 – The products of combustion are
(a) carbon dioxide and water
(b) oxygen and water
(c) only carbon dioxide
(d) only oxygen
Ans. (a) carbon dioxide and water