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Combustion and Flame Science - Combustion and Flame

Jharkhand Board (JAC) - STD 8 - Science (Jharkhand - English Medium). 458 questions in this chapter.

Question types

Combustion and Flame question types

458 questions across 11 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

458
Questions
11
Question groups
5
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Sample Questions

Combustion and Flame questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q. [I MARKS]1 Mark
Which of the following statements is $NOT$ true?
  • A
    Spontaneous combustion takes place without any apparent cause.
  • ✓
    The luminous zone of a flame has high temperature.
  • C
    Carbon dioxide gas causes global warming.
  • D
    The calorific value of a fuel is expressed in $kJ/ kg^{−1}.$

Answer: B.

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Q 3M.C.Q. [I MARKS]1 Mark
The given table lists some substances as per their burning tendencies.
Produce a flame
Do not produce a flame
Molten wax
Kerosene oil
Camphor
Charcoal
Which of the following substances is incorrectly categorized?
  • A
    Charcoal
  • B
    Camphor
  • ✓
    Kerosene oil
  • D
    Molten wax

Answer: C.

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Q 5M.C.Q. [I MARKS]1 Mark
How has the use of $CNG$ in automobiles reduced the pollution in cities?
  • A
    It produces less amount of sulphur dioxide and chlorine.
  • ✓
    It does not leave any residue or smoke after burning in the engine.
  • C
    It produces large amount of carbon dioxide.
  • D
    It is used in compressed form.

Answer: B.

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Q 29scientific reasons[2 marks ]2 Marks
Sourav was heating oil to fry potato chips. The cooking oil all of a sudden caught fire. He took water to pour on the fire to extinguish it. But meanwhile his mother came and switched off the gas and covered the wok completely with a plate. $1.$ Do you think pouring water to the burning oil would have worked? Why$?$ $2.$ Do you think what Sourav’s mother had done is right$?$ Why$?$ $3.$ Can you suggest other ways in which we can stop fire due to burning oil$?$ $4.$ What values of Sourav and Sourav’s mother are shown here$?$
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Q 43questions in details [4 marks ]4 Marks
Manu was heating oil to fry potato chips. The cooking oil all of a sudden caught fire; he poured water to extinguish the fire. Do you think this action was suitable. If yes, why? If not, why not? In such a condition what should Manu have done?
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Q 44questions in details [4 marks ]4 Marks
What type of combustion is represented by:
$a.$ Burning of white phosphorus in air at room temperature?
$b.$ Burning of $\text{LPG}$ in a gas stove?
$c.$ Ignition of a cracker?
$d.$ Burning of coal dust in a coal mine?
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Q 48questions in on sentence. [1 M]1 Mark
Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time?
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Q 51case /data -based (4 Marks)4 Marks
The table shows the caloriic value and pollutants released by four types of fuels.
Fuel Caloriic value (kilojoule / kg) Pollution factor
Type $1$ $25000 - 33000$ $CO_2,$ sulphur oxides and Nitrogen oxides
Type $2$ $55000$ $CO_2,$ Water vapour
Type $3$ $45000$ Carbon monoxide, $CO_2,$ Nitrogen oxides
Type $4$ $35000 - 40000$ $CO_2$ and Methane
$8.$ Which fuel can boil the water in a vessel the fastest$?$
$A.$ Type $1$
$B.$ Type $2$
$C.$ Type $3$
$D.$ Type $4$
$9.$ Which fuel can cause acid rain on combustion$?$
$A.$ Type $1$ only
$B.$ Type $4$ only
$C.$ Both Type $1$ and Type $3$
$D.$ Both Type $2$ and Type $4$
$10.$ Which fuel type is likely to be biogas$?$
$A.$ Type $1$
$B.$ Type $2$
$C.$ Type $3$
$D.$ Type $4$
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Q 52case /data -based (4 Marks)4 Marks
Fire extinguisher $K$ is suitable for kitchen fires.
Image
$5.$ Which ire extinguisher can perform most of the work of $K?$
$A. P$
$B. Q$
$C. R$
$D. S$
$6.$ How does dumping sand on ire extinguish the flame$?$
$7.$ Which of these materials is combustible$?$
$A.$ Steel
$B$. Wood
$D.$ Marble
$C.$ Glass
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Q 53case /data -based (4 Marks)4 Marks
The picture shows four types of ire extinguishers.
Each extinguisher is suited for speciic sources of fire.
Image
$4. $ A tailor has money for any two of the ire extinguishers.
Which pair of ire extinguishers should he buy for his tailoring shop$?$
$A. P$ and $Q$
$B. Q$ and $S$
$C. P$ and $R$
$D. S$ and $R$
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Q 54case /data -based (4 Marks)4 Marks
Sparkling rods light up when inserted in a flame.
The hotter the lame, the quicker the rod lights up.
The picture shows four different zones of a flame.
Image
$1.$ In which zone should a sparkling rod be inserted to light it the fastest$?$
$A.$ Zone $1$
$B.$ Zone $2$
$C.$ Zone $3$
$D.$ Zone $4$
$2.$ Why does the lame of a candle go off when all the wax melts$?$
$3.$ Which of these is true about spontaneous combustion$?$
Circle ‘Yes’ or ‘No’ for the correct response.
Is this true about spontaneous combustion? Yes or No
No fuel is required. Yes/No
No oxygen is required. Yes/No
No external heat source is required. Yes/No
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