NCERT Class VIII Science Solutions: Chapter 5-Coal and Petroleum Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 15:

Name the petroleum product used as fuel for stoves, lamps and jet aircrafts.

Answer:

Kerosene is used as fuel for stoves, lamps and jet aircrafts.

Question 16:

Fill in the blanks in the following sentences.

  1. Coal is one of the ________ used to cook food.
  2. When heated in air, coal burns and produces mainly ________ gas.
  3. Coal tar is a black, thick ________ with an ________ smell.
  4. Petroleum, ________ and ________ are fossil fuels.
  5. Forests and coal are ________ natural resources.

Answer:

  1. Coal is one of the fuels used to cook food.
  2. When heated in air, coal burns and produces mainly carbon dioxide gas.
  3. Coal tar is a black, thick liquid with an unpleasant smell.
  4. Petroleum, coal and natural are fossil fuels.
  5. Forests and coal are exhaustible natural resources.

Question 17:

The underlined words in the following sentences have been jumbled up. Write them in their correct form.

  1. Loca is obtained from mines.
  2. Umpetlore is a fossil fuel.
  3. Rineryfe is a place where various fractions of petroleum are separated.
  4. Keenrose is a fuel used in jet crafts.
  5. Nutsgilh is an example of inexhaustible natural resources.

Answer:

  1. Coal is obtained from mines.
  2. Petroleum is a fossil fuel.
  3. Refinery is a place where various fractions of petroleum are separated.
  4. Kerosene is a fuel used in jet crafts.
  5. Sunlight is an example of inexhaustible natural resources.

Question 18:

Fill in the blanks.

  1. The slow process of conversion of dead vegetation into coal is called________.
  2. Coal and petroleum are formed from the dead remains of organisms and are known as ________.
  3. The black thick liquid with ________ smell is known as coal tar.
  4. During the processing of coal to get coke, coal tar and ________ are also obtained.
  5. The process of separating the various constituents of petroleum is known as ________.
  6. Excessive burning of fossil fuels is a major cause of ________.

Answer:

  1. The slow process of conversion of dead vegetation into coal is called Carbonisation.
  2. Coal and petroleum are formed from the dead remains of organisms and are known as fossil fuels.
What is Fossil Fuel
  1. The black thick liquid with unpleasant smell is known as coal tar.
  2. During the processing of coal to get coke, coal tar and coal gas are also obtained.
  3. The process of separating the various constituents of petroleum is known as refining.
  4. Excessive burning of fossil fuels is a major cause of air pollution.

Question 19:

Write True/False against the following statements.

  1. Oxygen in air is an exhaustible natural resource.
  2. Resources which are present in unlimited quantity in nature are called exhaustible natural resources.
  3. Wildlife is an exhaustible natural resource.
  4. Under high temperature and pressure, dead plants get slowly converted to coal.
  5. CNG is less polluting fuel than petrol and diesel.

Answer:

  1. Oxygen in air is an exhaustible natural resource. (False)
  2. Resources which are present in unlimited quantity in nature are called exhaustible natural resources. (False)
  3. Wildlife is an exhaustible natural resource. (True)
  4. Under high temperature and pressure, dead plants get slowly converted to coal. (True)
  5. CNG is less polluting fuel than petrol and diesel. (True)