Questions

case /data -based (4 Marks)

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3 questions · timed · auto-graded

Question 14 Marks
The table shows two groups of natural resources.
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(i) Which of these statements is true about coal ?
$\quad$Circle 'Yes' or 'No' for the correct response.
Is this true about coal ?Yes or No
(a) Dirt makes up a large part of coal.Yes/No
(b) Coal is produced from plant fossils.Yes/No
(c) Formation of coal requires heat and pressure.Yes/No

(ii) Where is a coal reserve most likely to be found ?
$\quad$(a) Inside volcanoes
$\quad$(b) Beneath glaciers
$\quad$(c) On ocean floors
$\quad$(d) Under land surfaces
(iii) Which gas is mainly emitted during the combustion of coal ?
(vi) Coke is a product obtained by the processing of coal.
$\quad~~~$Which of these is a byproduct of making coke ?
$\quad$(a) Coal tar
$\quad$(b) Bitumen
$\quad$(c) Coal gas
$\quad$(d) Kerosene
Answer
(i) (a) No
(b) Yes, coal is formed from plant remains buried deep under the Earth.
(c) Yes, formation of coal requires high temperature and high pressure.
(ii) (d) Under land surfaces.
(iii) Carbon dioxide
(iv) (c) Coal gas
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Question 24 Marks
The table shows two groups of natural resources.
Group 1Group 2
Air. Sunlight, WaterCoal, Petroleum, Natural gas

(i) How is group 1 different from group 2 ?
(II) Which resource in group 2 will cause the least amount of air pollution on burning ?
Answer
(i)
Group 1Group 2
Present in unlimited quantityPresent in limited quantity
Will not exhaust even if used continuouslyWill exhaust if used continuously
Take thousands of years to formTake millions of years to form
Contain high percentages of carbonContain low percentages of carbon

(ii) Natural gas will contribute to least amount of air pollution on burning among resources in group 2.
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Question 34 Marks
The material X is a fossil fuel. It is formed from the buried large land plants (vegetation) by a very slow process Y. When X is heated in the absence of air, it gives three products A, B and C.
A is used in steel making B is used as an industrial fuel, whereas the product C has been traditionally used for metalling the roads. It is now replaced by a petroleum product, bitumen.
Now give the answer of the following questions.
(i) What is the material X ?
(ii) What is the physical state and colour of X ?
(iii) Name the processes Y.
(iv) What are the products A, B and C ?
Answer
(i) Coal
(ii) It is solid and black coloured.
(iii) Y is carbonisation.
(iv) A is coke, B is coal gas while C is coal tar.
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case /data -based (4 Marks) - Science STD 8 Questions - Vidyadip