NCERT Exemplar Class 8 Science Chapter 5: Coal and Petroleum. NCERT Exemplar Solutions for Class 8 Science Chapter 5 Coal and Petroleum prepare students for their Class 8 exams thoroughly.
Science problems and solutions for the Class 8 pdf are provided here which are similar to the questions being asked in the previous year’s board.
Contents
NCERT Exemplar Class 8 Science Chapter 5: Coal and Petroleum
Class 8: Science Chapter 5 solutions. Complete Class 8 Science Chapter 5 Notes.
Multiple Choice Questions
- Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource?
- (a) minerals
- (b) water
- (c) soil
- (d) plastic
- Air is a natural resource and cannot be exhausted by human activities. It is known as inexhaustible natural resource. Which of the following is another inexhaustible natural resource?
- (a) coal
- (b) petroleum
- (c) sun-light
- (d) minerals
- Which of the following is a pair of exhaustible natural resources.
- (a) coal and soil
- (b) air and sun-light
- (c) water and petroleum
- (d) wild life and minerals
- Coal is processed in industries to get some useful products. Which of the following is not obtained from coal?
- (a) coke
- (b) coal tar
- (c) coal gas
- (d) CNG
- Exhaustible natural resources are:
- (a) unlimited in quantity.
- (b) not dependent on nature.
- (c) limited in quantity.
- (d) not exhausted by human activities.
- Fossil fuels are obtained from:
- (a) remains of non-living materials.
- (b) dead remains of birds only.
- (c) dead remains of insects only.
- (d) dead remains of living organisms.
- Coal is formed from the remains of
- (a) vegetation only
- (b) animals only
- (c) both vegetation and animals
- (d) neither vegetation nor animals
- Which substance is formed by the carbonation of dead vegetation?.
- (a) coal
- (b) coke
- (c) coal gas
- (d) coal tar
- Naphthalene balls are obtained from coal tar and are used as
- (a) mosquito repellant
- (b) honey bee repellant
- (c) moth repellant
- (d) snake repellant
- Which of the following is not a constituent of petroleum?
- (a) paraffin wax
- (b) lubricating oil
- (c) petrol
- (d) coke
- Petroleum was formed from organisms:
- (a) living on the land
- (b) living on the plants
- (c) living in the sea
- (d) living on the rocks
- Choose the correct statement from the following:
- (a) It is difficult to transport natural gas through pipes.
- (b) The disadvantage of natural gas is that it can not be used directly for burning in homes.
- (c) Natural gas is stored under high pressure as compressed natural gas.
- (d) Natural gas cannot be used for power generation.
Very Short Answer Type Questions
- You are provided with a mixture of petroleum and water. Can you suggest a method to separate the two?
- What does CNG stand for and why is it considered to be a better fuel than petrol?
- Name the petroleum product used as fuel for stoves, lamps and jet aircrafts.
- Fill in the blanks in the following sentences.
- (a) Coal is one of the ________ used to cook food.
- (b) When heated in air, coal burns and produces mainly ________ gas.
- (c) Coal tar is a black, thick ________ with an ________ smell.
- (d) Petroleum, ________ and ________ are fossil fuels.
- (e) Forests and coal are ________ natural resources.
- The underlined words in the following sentences have been jumbled up. Write them in their correct form.
- (a) Loca is obtained from mines.
- (b) Umpetlore is a fossil fuel.
- (c) Rineryfe is a place where various fractions of peroleum are separated.
- (d) Keenrose is a fuel used in jet crafts.
- (e) Nutsgilh is an example of inexhaustible natural resources.
- Fill in the blanks.
- (a) The slow process of conversion of dead vegetation into coal is called__________.
- (b) Coal and petroleum are formed from the dead remains of organisms and are known as __________.
- (c) The black thick liquid with __________ smell is known as coal tar.
- (d) During the processing of coal to get coke, coal tar and __________ are also obtained.
- (e) The process of separating the various constituents of petroleum is known as __________.
- (f) Excessive burning of fossil fuels is a major cause of __________.
- Write True/False against the following statements.
- (a) Oxygen in air is an exhaustible natural resource.
- (b) Resources which are present in unlimited quantity in nature are called exhaustible natural resources.
- (c) Wildlife is an exhaustible natural resource.
- (d) Under high temperature and pressure, dead plants get slowly converted to coal.
- (e) CNG is less polluting fuel than petrol and diesel.
Short Answer Type Questions
- Sunlight and air are inexhaustible natural resources. Comment.
- Some natural resources are given in a box. Classify them into the exhaustible and inexhaustible natural resources.
air, coal, natural gas, sunlight, petroleum, minerals, forests, oxygen. - Write two important uses of coke.
- Write the characteristics and some important uses of coal.
- Look at Fig. 5.1 where petroleum and natural gas deposits are shown. Why do we find oil layer above water layer?
- Fill in the blanks and complete the story.
About 300 million years ago the earth had dense ________ in low lying wetland areas. Due to natural processes, like ______, these forests got burried under the ________. As more ________ deposited over them, they were compressed. The ________ also rose as they sank deeper and deeper. Under high ________ and high ________, dead plants got slowly converted into coal. - Match the items given in Column I with the items of Column II.
Long Answer Type Questions
- Name the products obtained and their uses when coal is processed in industry.
- We say fossil fuels will last only for a few hundred years. Comment.
- We read in newspapers that burning of fuels is a major cause of global warming. Explain why.
- While driving what are the tips we must follow to save petrol/diesel/natural gas?
- Imagine that all the exhaustible natural resources are exhausted by human activities. Do you think survival of living beings would be possible.? If yes, why?, If not, why not?
- Why petrol is exhaustible natural resource, whereas sunlight is not? Explain.
- Write some important uses of the various constituents of petroleum.
- Coal reserves are said to be enough to last for another hundred years. Do you think we need to worry in such case? Why or why not?
- What steps would you suggest for the judicious use of fossil fuels?
- Complete the crossword Fig. 5.2 with the help of the clues:
Across- 1. Fuels obtained form dead remains of living organisms. (6,5)
- 2. A process by which the various constituents of petroleum are separated. (8)
- 3. A porous black substance obtained form coal. (4)
- 4. Another name for motor fuel. (6)
- 5. The substance obtained by carbonisation. (4)
- 6. Fuel for heavy motor vehicles. (6)
- 7. A petroleum product used for road surfacing. (7)
- 8. Dead remains of sea animals got converted into it. (9)
Answers to Multiple Choice Questions
Mutiple Choice Questions
Very Short Answer Question
Short Answer Question
Long Answer Question
