Combustion and Flame Test

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Combustion and Flame Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

The essential constituent of all fuel gases is:

A
$$CO_{2}$$

B
$$N_{2}$$

C
$$CO$$

D
$$CH_{4}$$

Solution

Fuel gas is any one of a number of fuels that under ordinary conditions are gaseous. Many fuel gases are composed of hydrocarbons (such as methane or propane), hydrogen, carbon monoxide, or mixtures.
$$CO$$ is an essential constituent of all fuel gases.
Question 2
1 / -0

A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance?

A
Iron nail

B
Glass

C
Stone piece

D
Wood

Solution

Combustible substances are the substance which burn in air to produce heat and light are called combustible substances. Eg :- wood, coal, charcoal, kerosene, petrol, diesel, liquified petroleum gas (LPG), compressed natural gas (CNG) etc.
Substances like stone, glass, iron nails, etc. do not burn on being exposed to flame. Such substances are called non-combustible substances.
Question 3
1 / -0

Which of the following substances does not burn with a flame?

A
LPG

B
Camphor

C
Dry grass

D
Charcoal

Solution

Liquefied petroleum gas (LPG), also referred to as simply propane or butane are flammable mixtures of hydrocarbon gases, used as fuel in heating and cooking equipment and produce a blue flame. Camphor gives a flame, which is widely used in worship. Charcoal, does not vaporise and so, does not produce a flame. The substances which evaporate during burning, give flames. Thus, option D is correct.
Question 4
1 / -0

Magnesium ribbon on burning in air produces:

A
magnesium oxide, water and light

B
magnesium oxide and heat

C
magnesium oxide, heat and light

D
magnesium oxide, water and heat

Solution

When a piece of magnesium ribbon is ignited, light and heat are produced.
Magnesium reacts with oxygen to form a compound called magnesium oxide.
The reaction is as follows:

$$2Mg + O_2 \rightarrow 2MgO + \text{heat} + \text{light}$$

Hence, the correct option is $$\text{C}$$
Question 5
1 / -0

The greater the _____, better is the fuel.

A
non-combustible matter

B
moisture content

C
calorific

D
None of these

Solution

Calorific value is defined as the amount of heat energy produced on complete combustion of $$1 \ kJ$$ of a fuel. The efficiency of fuel depends on calorific value. If the calorific value is high, then the efficiency of fuel is also high. Whereas moisture content and the non-combustible matter should be low.
Therefore, we can say that the greater the calorific value, the better is the fuel.
Question 6
1 / -0

A chemical process in which a substance reacts with oxygen to give off heat is called as:

A
endothermic

B
combustion

C
reduction

D
none of the above

Solution

Combustion is a chemical process in which, a substance reacts rapidly with oxygen and gives off heat. The original substance is called the fuel, and the source of oxygen is called the oxidizer.
Question 7
1 / -0

The calorific value of a fuel is expressed in a unit called as ______________.

A
kilojoule per litre

B
kilogram per mililitre

C
kilojoule per gram

D
kilojoule per kilogram

Solution

The calorific value of a fuel is expressed in a unit called kilojoule per kilogram (kJ/kg). Calorific value is used to measure fuel efficiency.

Hence, the correct option is D.
Question 8
1 / -0

Which fuel used in jet crafts?

A
Car pertrol

B
CNG

C
Kerosene

D
Deiseal

Solution

Jet-A powers modern commercial airliners and is a mix of extremely refined kerosene and burns at temperatures at or above 49 °C . Kerosene-based fuel has a much higher ignition temperature than gasoline-based fuel, meaning that it requires a significantly higher temperature to ignite. Kerosene on burning provides a large amount of energy and is hence used as fuel in jet crafts.
Question 9
1 / -0

CNG and LPG are ________ substances.

A
highly toxic

B
inflammable

C
inexhaustible

D
none of these

Solution

We use CNG and LPG in our everyday life. These fuels do not cause toxicity if handled safely. We have limited reserves of these fuels and, so they are exhaustible. CNG and LPG have low ignition temperatures and can easily catch fire. So, these three are inflammable substances. Thus out of the given options, only option B is correct.
Question 10
1 / -0

In villages, people use wood as a fuel because:

A
it is considered to be an ideal fuel

B
of its easy availability and low cost

C
it is environment friendly

D
it catches fire easily

Solution

Wood burns to leave behind undesirable substances, so it is not environment friendly. Wood is not always easy to burn and has a lower calorific value than most other fuels we use today. So, it is definitely not an ideal fuel. But even then people in villages use wood as a fuel mostly because of its easy availability and low cost.

Hence, option $$B$$ is correct.

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Re-Attempt Weekly Quiz Competition

Combustion and Flame Test - 14

Result

Combustion and Flame Test - 14

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SHARING IS CARING

Question 1

$$CO_{2}$$

$$N_{2}$$

$$CO$$

$$CH_{4}$$

Solution

Question 2

Iron nail

Glass

Stone piece

Wood

Solution

Question 3

LPG

Camphor

Dry grass

Charcoal

Solution

Question 4

magnesium oxide, water and light

magnesium oxide and heat

magnesium oxide, heat and light

magnesium oxide, water and heat

Solution

Question 5

non-combustible matter

moisture content

calorific

None of these

Solution

Question 6

endothermic

combustion

reduction

none of the above

Solution

Question 7

kilojoule per litre

kilogram per mililitre

kilojoule per gram

kilojoule per kilogram

Solution

Question 8

Car pertrol

CNG

Kerosene

Deiseal

Solution

Question 9

highly toxic

inflammable

inexhaustible

none of these

Solution

Question 10

it is considered to be an ideal fuel

of its easy availability and low cost

it is environment friendly

it catches fire easily

Solution

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