A. Solve the crossword puzzle with the help of clues given ACROSS 1. A variety of coal. (7) 2. An inexhaustible source of energy. (8) 3. A product obtained from petroleum which is not used as a fuel. (7) 'D L E 4. The gas obtained by heating coal and containing methane and hydrogen. (7) A 5. The rain having dissolved oxides of sulphur and nitrogen. (8) P c L DOWN 6. Mineral used in the manufacture of A DR cement. (9) 7. Organisation which promotes the conservation of petroleum. (4) 8. A product obtained from petroleum that is used as auto fuel. (6) 9. A product obtained from coal and used in metallurgy. (4)
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Explanation:
1. 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
Soln:
Answer is (d) plastic
Explanation:
Minerals, water and soil are natural resources whereas plastic is a man-made substance.
2. 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?
(a) coal
(b) petroleum
(c) sun-light
(d) minerals
Soln:
Answer is (c) sun-light
Explanation:
Caol, petroleum and minerals are non-renewable sources of energy, which can get exhausted whereas sunlight is a renewable resource.
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