Combustion and Flame Test

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Combustion and Flame Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

_____ is a better domestic fuel than wood.

A
CNG

B
LPG

C
Petrol

D
All of above

Solution

LPG is a better domestic fuel than wood because of several reasons. Unlike wood, LPG burns without smoke. This makes the life of housewives more comfortable and they do not have to worry about the blackening of pots and pans. Moreover, the use of LPG as domestic fuel also rules out the chances of getting respiratory disorders which may happen when someone uses wood as kitchen fuel. Storage and transportation of LPG is easier compared to that of wood.
Option $$B$$ is correct.
Question 2
1 / -0

When paper is wrapped around an Aluminium pipe ____________.

A
ignition temperature reduces

B
ignition temperature increase

C
no change in ignition temperature

D
the paper and aluminium catches fire very easily

Solution

The ignition temperature of paper is lower compared to that of Aluminium. When paper is wrapped around an Aluminium pipe; the ignition temperature increases. That is why paper itself catches fire easily whereas a piece of paper wrapped around an Aluminium pipe does not.
Question 3
1 / -0

Wood has now been replaced by which fuel as a domestic fuel?

A
LPG

B
CNG

C
Coal

D
None of the above

Solution

Wood has now been replaced by LPG as a domestic fuel used for the purposes of cooking. That's because burning of wood produces a lot of smoke and leaves behind residue. LPG on the other hand is a clean burning gas that does not leave residue.

However, in some rural areas, wood is still used, but less widely.
Question 4
1 / -0

Combustion of most fuels releases $$CO_2$$ causing:

A
Water pollution

B
Global warming

C
Acid rain

D
All of above

Solution

Combustion of most fuels releases $$CO_2$$ causing global warming. Global warming is the rise in the temperature of the atmosphere of the earth.
Question 5
1 / -0

Which of the following is a solid fuel?

A
Kerosene

B
LPG

C
Charcoal

D
Methane

Solution

Solid fuel refers to solid materials that are used as fuel to produce energy usually released through combustion. Solid fuels include wood, charcoal, and coal. Kerosene is a liquid fuel. LPG or (Liquified Petroleum Gas) is the liquified form of petroleum gas, which is a gaseous fuel. Methane is also a gas.
Question 6
1 / -0

What is an ideal fuel?

A
It has high calorific value.

B
It is cheap.

C
It is readily combustible.

D
All of the above

Solution

An ideal fuel is cheap, readily available, easy to transport and readily combustible. It has high calorific value. It does not produce gases or residues that pollute environment.
Question 7
1 / -0

Which of the following comes close to being an ideal fuel?

A
Kerosene

B
Petrol

C
Biogas

D
Wood

Solution

Every fuel has some disadvantages. That is why there's no fuel that can be considered an ideal fuel. Biogas comes close to being an ideal gas because it has a high calorific value, is easily processed from cow dung and other waste materials, is environment friendly and burns smoothly without leaving much residue. It contains negligible amount of non-volatile materials.
Question 8
1 / -0

The ignition temperature of an ideal fuel should _____________.

A
Lowest

B
Highest

C
Neither too high nor too low

D
None of the above

Solution

Ideal fuel should have a proper ignition temperature, so that it can be burned easily. The ignition temperature of an ideal fuel should neither be too low nor too high. If the ignition temperature of the fuel is very low, then the fuel will catch fire too easily and hence it will be very unsafe to use it. On the other hand, if the ignition temperature is too high, then it will be very difficult to light the fuel.
Question 9
1 / -0

Gasoline combusts in the presence of oxygen. Identify whether Combustion is a physical property or chemical property

A
There is not enough information to tell if this is a physical or chemical property.

B
This is neither a physical nor a chemical property.

C
This is both a physical and chemical property.

D
This is a physical property.

E
This is a chemical property.

Solution

Physical properties can be observed or measured without changing the composition of matter. Physical properties are used to observe and describe matter. Combustion is a chemical reaction between more than one element or substance that gives off heat as a by-product. Gasoline reacts with oxygen to form products.
Question 10
1 / -0

The hottest region of Bunsen flame shown in the figure below is:

A
region 2

B
region 3

C
region 4

D
region 1

Solution

The hottest region of Bunsen flame shown in the figure is region $$2$$. It is just above the tip of the primary flame. It reaches about 1,500 °C (2,700 °F).
Region- 1 (Pre-heating zone)
Region- 2 (Primary combustion zone, hottest zone)
Region- 3 (lnternal zone)
Region- 4 (Secondary reaction zone)

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 28

Result

Combustion and Flame Test - 28

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SHARING IS CARING

Question 1

CNG

LPG

Petrol

All of above

Solution

Question 2

ignition temperature reduces

ignition temperature increase

no change in ignition temperature

the paper and aluminium catches fire very easily

Solution

Question 3

LPG

CNG

Coal

None of the above

Solution

Question 4

Water pollution

Global warming

Acid rain

All of above

Solution

Question 5

Kerosene

LPG

Charcoal

Methane

Solution

Question 6

It has high calorific value.

It is cheap.

It is readily combustible.

All of the above

Solution

Question 7

Kerosene

Petrol

Biogas

Wood

Solution

Question 8

Lowest

Highest

Neither too high nor too low

None of the above

Solution

Question 9

There is not enough information to tell if this is a physical or chemical property.

This is neither a physical nor a chemical property.

This is both a physical and chemical property.

This is a physical property.

This is a chemical property.

Solution

Question 10

region 2

region 3

region 4

region 1

Solution

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