Combustion and Flame Test

Result

Combustion and Flame Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following does not represent characteristic of a good fuel?

A
It should have a high calorific value.

B
Its ignition temperature should be low but well above the room temperature.

C
It should have a high rate of combustion.

D
It should be fairly cheap and safe to handle and transport.

Solution

A good fuel should have a moderate rate of combustion and should release heat in a controlled manner.
Question 2
1 / -0

How has the use of CNG in automobiles reduced the pollution in cities?

A
It produces less amount of sulphur dioxide and chlorine.

B
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.

Solution

CNG does not produce any pollutant.
Question 3
1 / -0

Read the given statements and select the correct option.

Statement 1: Phosphorus burns in air at room temperature.
Statement 2: It is an example of spontaneous combustion.

A
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

B
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

C
Statement 1 is true and statement 2 is false.

D
Both statements 1 and 2 are false.

Solution

Phosphorous has a very low ignition temperature (lower than the room temperature) so, it burns rapidly in air at room temperature producing heat and light.
Question 4
1 / -0

Colours of flame produced by kerosene lamp, candle and Bunsen burner are respectively

A
Blue, yellow and yellow

B
Yellow, yellow and blue

C
Orange, blue and yellow

D
Yellow, orange and yellow.

Solution

Kerosene lamp - yellow flame Candle - yellow flame Bunsen burner - Blue flame
Question 5
1 / -0

Global warming leads to a rise in the sea level causing floods in the coastal areas. One of the main reasons of global warming is

A
Combustion of fuels releases sulphur dioxide which increases the temperature

B
Combustion of fuels releases carbon monoxide which decreases the temperature

C
Combustion of fuels releases unburnt carbon particles which causes decrease in temperature

D
Combustion of fuels releases carbon dioxide which causes increase in temperature.

Solution

Global warming is the increase of earth's average temperature due to significant increase in the level of CO₂, from combustion of fuels.
Question 6
1 / -0

Read the given statements and select the correct options.

Statement 1: Kerosene oil and wood do not catch fire on their own at room temperature.

Statement 2: A combustible material cannot catch fire as long as its temperature is lower than its ignition temperature.

A
Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

B
Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

C
Statement 1 is true and statement 2 is false.

D
Both statements 1 and 2 are false.

Solution

Ignition temperature is the lowest temperature at which a combustible substance catches fire.
Question 7
1 / -0

What is the principle of soda fire extinguisher?

A
Carbon dioxide produced cuts off the supply of oxygen by covering the fire like a blanket.

B
Water produced cuts off the supply of oxygen by covering the fire.

C
Acid present in the container reacts with fire.

D
Nitrogen gas produced cuts off the supply of oxygen by covering the fire.

Solution

Carbon dioxide being heavier than oxygen, covers the fire like a blanket. Since the contact between the fuel and oxygen is cut off, the fire is controlled.

Question 8

1 / -0

Match column I with column II and select the correct option from the codes given below.

Column I	Column II
P. Rusting	(i) Explosion
Q. Burning of Paper	(ii) Spontaneous combustion
R. Sodium	(iii) Rapid combustion
S. Fire crackers	(iv) Slow combustion

P-(ii), Q-(iii), R-(i), S-(iv)

P-(i), Q-(iii), R-(ii), S-(iv)

P-(iii), Q-(ii), R-(i), S-(ii)

P-(iv), Q-(iii), R-(ii), S-(i)

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 2

Result

Combustion and Flame Test - 2

Score

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Rank

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SHARING IS CARING

Question 1

It should have a high calorific value.

Its ignition temperature should be low but well above the room temperature.

It should have a high rate of combustion.

It should be fairly cheap and safe to handle and transport.

Solution

Question 2

It produces less amount of sulphur dioxide and chlorine.

It does not leave any residue or smoke after burning in the engine.

It produces large amount of carbon dioxide.

It is used in compressed form.

Solution

Question 3

Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

Statement 1 is true and statement 2 is false.

Both statements 1 and 2 are false.

Solution

Question 4

Blue, yellow and yellow

Yellow, yellow and blue

Orange, blue and yellow

Yellow, orange and yellow.

Solution

Question 5

Combustion of fuels releases sulphur dioxide which increases the temperature

Combustion of fuels releases carbon monoxide which decreases the temperature

Combustion of fuels releases unburnt carbon particles which causes decrease in temperature

Combustion of fuels releases carbon dioxide which causes increase in temperature.

Solution

Question 6

Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

Statement 1 is true and statement 2 is false.

Both statements 1 and 2 are false.

Solution

Question 7

Carbon dioxide produced cuts off the supply of oxygen by covering the fire like a blanket.

Water produced cuts off the supply of oxygen by covering the fire.

Acid present in the container reacts with fire.

Nitrogen gas produced cuts off the supply of oxygen by covering the fire.

Solution

Question 8

P-(ii), Q-(iii), R-(i), S-(iv)

P-(i), Q-(iii), R-(ii), S-(iv)

P-(iii), Q-(ii), R-(i), S-(ii)

P-(iv), Q-(iii), R-(ii), S-(i)

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