Combustion and Flame Test

Result

Combustion and Flame Test - 24

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is(are) characteristic(s) of a flammable substances?

A
High ignition temperature

B
Low ignition temperature

C
High boiling point

D
Both A and B

Solution

The lowest temperature at which a substance catches fire is called its ignition temperature.
A flammable substance can easily catch fire as it has a low ignition temperature.
Hence option B is correct.
Question 2
1 / -0

Ignition temperature of flammable substances is _____________.

A
high

B
low

C
very high

D
None

Solution

Flammable substances are the one whose ignition temperature is low as they can easily catch fire.

Hence the option B is correct.
Question 3
1 / -0

What happens to ignition temperature of a substance as the pressure of oxygen concentration decreases?

A
It decreases

B
It increases

C
No change

D
None of the above

Solution

As the supply of oxygen decreases the substance does not get the required energy to undergo combustion. It is same as the activity of paper cup where the cup having water doesn't burn easily because the ignition temperature has not met. So here also if the pressure of the oxygen concentration decreases its ignition temperature will increase.

Option $$B$$ is correct.
Question 4
1 / -0

Which among the following is not flammable?

A
Rubber

B
Wood

C
Methanol

D
Water

Solution

Water is not flammable as it has a high ignition point. The reason that water (in any state) is not flammable is that it is already the product of combustion.
Question 5
1 / -0

Which of the following has the lowest ignition temperature?

A
Coal

B
Wood

C
Paper

D
Kerosene

Solution

Coal ignition temperature: $$454^oC$$
Wood ignition temperature:- More than $$300^oC$$
Paper ignition temperature: $$233^oC$$
Kerosene ignition temperature: $$220^oC$$
Question 6
1 / -0

What do we need to get 100% fuel efficiency?

A
Ideal fuel

B
Ideal engine

C
Ideal driver

D
Both A and B

Solution

To convert all the thermal energy into work we need an ideal engine and ideal fuel.
Thus we can get 100% fuel efficiency.
Both A and B are correct.
Hence, the correct option is $$D$$.
Question 7
1 / -0

Which of the following can undergo spontaneous combustion?

A
Petrol

B
Diesel

C
Hay

D
All of the above

Solution

Hay can catch fire under normal conditions. Hence, it can undergo spontaneous combustion.
Question 8
1 / -0

Which of the following do not produce flame on burning?

A
Petrol

B
Coal

C
L.P.G

D
Kerosene

Solution

Coal burns directly without getting vaporised. So it does not produce the flame. It burns with a glow.
Question 9
1 / -0

The innermost zone of candle flame is the least hot due to the presence of :

A
unburnt wax vapour.

B
no supply of oxygen.

C
presence of wick.

D
all the above

Solution

The innermost zone is the least hot and black in color. This is due to the presence of unburned wax vapors.
Hence, option A is correct.
Question 10
1 / -0

A form of combustion reaction where there is a release of high amount of heat and light energy in a small interval of time is _____________.

A
spontaneous combustion

B
rapid combustion

C
fast combustion

D
instant combustion

Solution

Rapid Combustion is the process in which a substance burns rapidly and produces heat and light. Hence, a form of combustion reaction where there is a release of a high amount of heat and light energy in a small interval of time is 'Rapid Combustion'.

Hence, the correct option is $$\text{B}$$

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 24

Result

Combustion and Flame Test - 24

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SHARING IS CARING

Question 1

High ignition temperature

Low ignition temperature

High boiling point

Both A and B

Solution

Question 2

high

low

very high

None

Solution

Question 3

It decreases

It increases

No change

None of the above

Solution

Question 4

Rubber

Wood

Methanol

Water

Solution

Question 5

Coal

Wood

Paper

Kerosene

Solution

Question 6

Ideal fuel

Ideal engine

Ideal driver

Both A and B

Solution

Question 7

Petrol

Diesel

Hay

All of the above

Solution

Question 8

Petrol

Coal

L.P.G

Kerosene

Solution

Question 9

unburnt wax vapour.

no supply of oxygen.

presence of wick.

all the above

Solution

Question 10

spontaneous combustion

rapid combustion

fast combustion

instant combustion

Solution

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