Coal and Its Fomation

Q. Calorific value of wood is 18, 000kJ . How much of wood is required to produce heat energy of 108, 000kJ ?

Q.

Which petroleum product is used in place of coal tar for metalling the roads?

1. Bitumen

2. Naphthalene balls.

3. Coal gas

4. Coal tar

Q.

Air is a natural resource and cannot be exhausted by human activities. It is known as an inexhaustible natural resource. Which of the following is another inexhaustible natural resource?

1. Coal

2. Petroleum

3. Sun-light

4. Minerals

Q.

Which of these is not a property of carbon dioxide?

1. Supports combustion

2. Acidic in nature

3. Colorless and odorless gas.

4. Forms dry ice

Q. What are the four varieties of coal in the increasing order of carbon content?

1. Peat, Lignite, Anthracite, Bituminous
2. Peat, Bituminous, Lignite, Anthracite
3. Peat, Lignite, Bituminous, Anthracite
4. Lignite, Peat, Bituminous, Anthracite

Q. Look at Fig. 5.1 where petroleum and natural gas deposits are shown. Why do we find oil layer above water layer?​

Q. What is lignite?

Q. Question 2
Name the petroleum product used for surfacing of roads.

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

1. iron nail​
2. glass
3. Stone piece
4. wood

Q. Are all combustible substances fuels ? Justify your answer .

Q. A given mass of fuel having a calorific value of 45, 000 kJ/kg on burning produces 67, 500 kJ of heat. The mass of the fuel used is:

1. 2 kg
2. 1.5 kg
3. 5 kg
4. 15 kg

Q.

Identify the gas that is generally produced when coal is burnt in the presence of a lot of air.

1. Carbon monoxide

2. Sulphur dioxide

3. Carbon dioxide

4. Nitrogen dioxide

Q. Arrange the following in descending order based on their calorific value.
(i) Wood
(ii) LPG
(iii) Hydrogen
(iv) Petrol

1. LPG > Hydrogen > Petrol > Wood
2. Hydrogen > LPG > Petrol > Wood
3. Hydrogen > Petrol > Wood > LPG
4. Wood > Hydrogen > Petrol > LPG

Q.

Name any two inexhaustible and exhaustible natural resources.

Q. Which among the following is not a product of petroleum refinery?

1. Kerosene
2. Coke
3. CNG
4. Lubricating oil

Q. Bituminous is a:

1. most widely used in the United States
2. a soft, intermediate grade of coal
3. all of these
4. the most common form of coal

Q. The highest grade of coal, whose surface is shining and has the highest calorific value, is:

1. bituminous
2. peat
3. anthracite
4. lignite

Q.

Differentiate between coal and coke.

Q.

___ is a gaseous combustible substance.

1. Coal

2. None of these

3. Methane

4. Kerosene

Q. The coal with highest ash content is?

1. Lignite
2. Coking Coal
3. Steam Coal
4. Bituminous Coal

Q. Which of the following type of coal is having lowest carbon content and heating value.

1. anthracite
2. bituminous
3. lignite
4. all of them

Q.

What is the average energy density of hydrogen compared to petrol?

1. Energy density is two times to that of petrol

2. Energy density is ten times to that of petrol

3. Energy density is three times to that of petrol

4. Energy density is exactly same as petrol

Q.

The variety of coal used as household coal is:

1. anthracite
2. peat
3. lignite
4. bituminous

Q. What is the percentage of free carbon in anthracite?

1. 30
2. 60
3. 90
4. 95

Q.

What are the combustibles in fuel?

1. Carbon, hydrogen and Oxygen

2. Hydrogen, sulfur and oxygen

3. Sulfur and oxygen

4. Carbon, Hydrogen and Sulfur

Q. Which of the following forms of coal has maximum percentage of carbon ?

1. Anthracite
2. Lignite
3. Peat
4. Bituminous

Q. Which is the best quality coal?

1. Lignite
2. Peat
3. Bituminous
4. Anthracite

Q. Which petroleum product is used to surface the roads?

1. Coal tar
2. Bitumen
3. Paraffin wax
4. Cement

Q. What is the superior quality of coal called?

1. Peat
2. Lignite
3. Bituminous
4. Anthracite

Q.

In which of the following forms is oil trapped inside the Earth?

1. Gaseous form

2. Droplets between the rocks

3. Black solid

4. Pool of liquid