Combustion And Flame Test

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Combustion And Flame Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following options is a supporter of combustion?

A
Carbon dioxide

B
Oxygen

C
Water vapors

D
Sand
Question 2
1 / -0

Which of the following options is a constituent of the substance applied on the head of the matchstick?

A
Potassium chlorate

B
Phosphorous pentoxide

C
Potassium chloride

D
All the above
Question 3
1 / -0

Which of the following substances is the first to catch fire in a matchstick?

A
Potassium chlorate

B
Potassium chloride

C
Antimony trisulphide

D
Red phosphorus
Question 4
1 / -0

Which of the following has the lowest ignition temperature?

A
Charcoal

B
Hydrogen

C
Kerosene oil

D
Wood

Solution

The ignition temperature of a given substance is the measure of the minimum temperature at which the substance ignites, without the presence of an external spark or flame. Out of the following, kerosene oil has the lowest ignition temperature i.e it can easily catch fire.
Question 5
1 / -0

What happens when water is heated in a paper cup?

A
Paper cup burns up without any change in the temperature of water.

B
Paper cup burns up with water undergoing the boiling process.

C
There is no effect on both paper cup and water.

D
Water continues to boil without paper cup getting burnt up.

Solution

Water utilizes the heat given to paper in boiling and therefore, the ignition temperature of paper never reaches the required one.
Question 6
1 / -0

Which of the following options is the best fire extinguisher?

A
Water

B
Carbon dioxide

C
Woollen cloth

D
None of these

Solution

Carbon-dioxide is a heavier gas which settles down on the material and cuts off the supply of oxygen.
Question 7
1 / -0

Which of the following statements is true regarding CO₂ acting as fire extinguisher?

A
CO₂ reacts with oxygen

B
CO₂ is lighter than oxygen

C
CO₂ is heavier than oxygen

D
CO₂ raises the temperature of the fuel
Question 8
1 / -0

Which of the following substances does not vapourise on burning?

A
Charcoal

B
Wax

C
Kerosene oil

D
Petrol

Solution

Correct Answer: Charcoal
Charcoal does not vapourise on heating and hence, it does not burn with a flame.
Question 9
1 / -0

Which of the following statements is true about burning of candle and coal?

A
Burning of both candle and coal is a physical change.

B
Burning of candle produces light, whereas burning of coal does not.

C
Burning of candle does not produce heat energy.

D
Burning of candle produces only heat but no light.

Solution

Correct Answer: Burning of candle produces light, whereas burning of coal does not.
Both paraffin wax and coal are solid fuels, but only paraffin wax vapourises on heating and hence, it burns with a flame and gives out light.
Coal only smoulders on combustion.
Question 10
1 / -0

Which of the following substances is not produced when coal is burnt in air?

A
CO₂

B
H₂

C
Light

D
Heat
Question 11
1 / -0

What should be the state of a substance in order to undergo combustion?

A
Solid or liquid

B
Liquid or gas

C
Solid, liquid, or gas

D
Only liquid

Solution

A combustible substance may be in the solid, liquid, or gaseous state.
Question 12
1 / -0

What happens to the ignition temperature of the burning object when the fire brigade pours water on it?

A
Water lowers the ignition temperature of the burning substance.

B
There is no effect on the ignition temperature of the substance.

C
Water raises the ignition temperature of the burning substance.

D
There is no correlation between the ignition temperature and the effect produced by the pouring of water.

Solution

Correct Answer: There is no effect on the ignition temperature of the substance.
The ignition temperature of the substance does not change, but water cools the substance below its ignition temperature.
Question 13
1 / -0

Wood cannot burn by just bringing a matchstick near it, because

A
ignition temperature of wood is low.

B
ignition temperature of wood is high.

C
wood is a non combustible substance.

D
wood is an inflammable substance.
Question 14
1 / -0

Which out of the following chemical substances are the components of a matchstick head?
(I) Antimony trisulphide (II) Potassium Chlorate
(III) Red Phosphorus (IV) Powdered glass

A
(III) and (IV)

B
(II) and (III)

C
(I), (II).(III) and (IV)

D
(I) and (IV)
Question 15
1 / -0

Which out of the following options is not an inflammable substance?

A
Petrol

B
Wood

C
Alcohol

D
LPG
Question 16
1 / -0

Which out of the following options is not an essential condition for combustion?

A
Carbon dioxide

B
Fuel

C
Oxygen

D
Heat

Solution

Correct Answer: Carbon dioxide
Presence of carbon dioxide is not an essential condition for combustion.
Rather CO₂ is used to extinguish the fire.
Question 17
1 / -0

Water will not work as a fire extinguisher in
I. in an electrical appliances shop
II. in a newspaper factory
III. in a furniture house

A
II and III

B
I and III

C
Only III

D
Only I

Solution

In an electrical appliances shop, the fire would be due to electrical short circuit and if we pour water on to it, it can cause a severe electic shock to the person.
Question 18
1 / -0

In what form carbon dioxide is stored in cylinders?

A
In liquid state at high pressure

B
In gaseous state at low pressure

C
In liquid state at low pressure

D
In gaseous state at high pressure

Solution

In gaseous state at high pressure carbon dioxide is stored in cylinders.
Question 19
1 / -0

What does the blue colour of the flame indicate?

A
Incomplete combustion

B
Complete combustion

C
Partial combustion

D
None of the above

Solution
Question 20
1 / -0

Which of the following substances has the maximum calorific value?

A
CNG

B
Biogas

C
LPG

D
Coal

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Re-Attempt Weekly Quiz Competition

Combustion And Flame Test - 9

Result

Combustion And Flame Test - 9

Score

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Rank

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SHARING IS CARING

Question 1

Carbon dioxide

Oxygen

Water vapors

Sand

Question 2

Potassium chlorate

Phosphorous pentoxide

Potassium chloride

All the above

Question 3

Potassium chlorate

Potassium chloride

Antimony trisulphide

Red phosphorus

Question 4

Charcoal

Hydrogen

Kerosene oil

Wood

Solution

Question 5

Paper cup burns up without any change in the temperature of water.

Paper cup burns up with water undergoing the boiling process.

There is no effect on both paper cup and water.

Water continues to boil without paper cup getting burnt up.

Solution

Question 6

Water

Carbon dioxide

Woollen cloth

None of these

Solution

Question 7

CO2 reacts with oxygen

CO2 is lighter than oxygen

CO2 is heavier than oxygen

CO2 raises the temperature of the fuel

Question 8

Charcoal

Wax

Kerosene oil

Petrol

Solution

Question 9

Burning of both candle and coal is a physical change.

Burning of candle produces light, whereas burning of coal does not.

Burning of candle does not produce heat energy.

Burning of candle produces only heat but no light.

Solution

Question 10

CO2

H2

Light

Heat

Question 11

Solid or liquid

Liquid or gas

Solid, liquid, or gas

Only liquid

Solution

Question 12

Water lowers the ignition temperature of the burning substance.

There is no effect on the ignition temperature of the substance.

Water raises the ignition temperature of the burning substance.

There is no correlation between the ignition temperature and the effect produced by the pouring of water.

Solution

Question 13

ignition temperature of wood is low.

ignition temperature of wood is high.

wood is a non combustible substance.

wood is an inflammable substance.

CO₂ reacts with oxygen

CO₂ is lighter than oxygen

CO₂ is heavier than oxygen

CO₂ raises the temperature of the fuel

CO₂

H₂