Combustion and Flame - Jharkhand Board (JAC) STD 8 Science Questions - Vidyadip

Question types

Combustion and Flame question types

94 questions across 6 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

94

Questions

6

Question groups

5

Question types

M.C.Q. [I MARKS]

Fill in the blanks: [1 M]

questions in short. [2 marks ]

questions in short. [3 marks ]

questions in details [4 marks ]

questions in on sentence. [1 M]

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 is the main cause of global warming?

A
Nitrogen dioxide
B
Sulphur dioxide
✓
Carbon dioxide
D
Ozone

Answer: C.

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Q 2M.C.Q. [I MARKS]1 Mark

Which of the following is not used in making matchsticks these days?

A
Potassium chlorate
✓
White phosphorus
C
Antimony trisulphide
D
Red phosphorus

Answer: B.

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Q 3M.C.Q. [I MARKS]1 Mark

Which of the following fuels has the lowest calorific value?

A
Kerosene
B
$CNG$
✓
Biogas
D
$LPG$

Answer: C.

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Q 4M.C.Q. [I MARKS]1 Mark

Which of the following fuels has the highest calorific value?

A
Natural gas
B
Liquefied petroleum gas
✓
Coal gas
D
Hydrogen gas

Answer: C.

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Q 5M.C.Q. [I MARKS]1 Mark

A heap of green leaves is lying in one corner of a park. The green leaves in the heap burn with difficulty because:

A
They contain a tough material called cellulose.
✓
They contain a lot of water.
C
They contain a green pigment chlorophyll.
D
They do not get sufficient oxygen for burning.

Answer: B.

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Q 6Fill in the blanks: [1 M]1 Mark

Fill in the following blanks with suitable words: The amount of heat evolved when $1kg$ of a fuel is burnt completely is called its $............$

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Q 7Fill in the blanks: [1 M]1 Mark

Fill in the following blanks with suitable words: A fuel must be heated to its $............$ before it starts burning.

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Q 8Fill in the blanks: [1 M]1 Mark

Fill in the following blanks with suitable words: A liquid fuel used in homes is $............$

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Q 9Fill in the blanks: [1 M]1 Mark

Fill in the following blanks with suitable words: The substances which vaporise during burning, give $............$

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Q 10Fill in the blanks: [1 M]1 Mark

Fill in the following blanks with suitable words: The most common supporter of combustion around us is $............$

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Q 11questions in short. [2 marks ]2 Marks

What is the first thing you should do if a fire breaks out in your home or neighbourhood?

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Q 12questions in short. [2 marks ]2 Marks

How is the fire produced by burning oil (or petrol) extinguished?

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Q 13questions in short. [2 marks ]2 Marks

State any four characteristics of an ideal fuel $($or good fuel$).$

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Q 14questions in short. [2 marks ]2 Marks

How will you show that air is necessary for combustion?

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Q 15questions in short. [2 marks ]2 Marks

A drum full of kerosene catches fire. What is the simplest way to put off this fire?

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Q 16questions in short. [3 marks ]3 Marks

Explain how, carbon dioxide is able to control fires.

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Q 17questions in short. [3 marks ]3 Marks

Give two examples each of:
$a.$ Solid fuels.
$b.$ Liquid fuels.
$c.$ Gaseous fuels.

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Q 18questions in short. [3 marks ]3 Marks

Abida and Ramesh want to heat water taken in separate beakers. 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? Why?

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Q 19questions in short. [3 marks ]3 Marks

Describe one method of putting out a fire caused by burning wood or paper.

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Q 20questions in short. [3 marks ]3 Marks

What are the disadvantages of burning wood as fuel?

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Q 21questions 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 22questions in details [4 marks ]4 Marks

What makes the middle zone of a candle flame luminous (or light-giving)?

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Q 23questions in details [4 marks ]4 Marks

What is global warming? Name the gas whose increasing percentage in air is leading to global warming. State a harmful effect which can be caused by global warming.

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Q 24questions in on sentence. [1 M]1 Mark

“The calorific value of $LPG$ is $55000\ kJ/ kg”.$ What does it mean$?$

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Q 25questions in on sentence. [1 M]1 Mark

Which zone of a candle flame is the hottest?

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Q 26questions in on sentence. [1 M]1 Mark

What is meant by explosive combustion (or explosion)? Give one example of explosive combustion (or explosion).

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Q 27questions in on sentence. [1 M]1 Mark

Name the term which is used to express the efficiency of a fuel.

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Q 28questions in on sentence. [1 M]1 Mark

Name two substances having low ignition temperatures and two having high ignition temperatures.

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