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CBSE Class 10 Science Quiz | CBSE Class 10 Science Quiz and Answers

161 We should reduce the use of the plastic bags, bottles etc. because:
[A] They are not durable
[B] They are non-biodegradable
[C] They are made of toxic materials
[D] They react with the atmospheric gases
Answer: They are non-biodegradable
162 Every food chain in the ecosystem begins with………. which are the original source of food.
[A] Producers
[B] Herbivores
[C] Saprophytes
[D] Parasites
Answer: Producers

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163 If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be:
[A] 1 J
[B] 0.01 J
[C] 10 J
[D] 0.1 J
Answer: 1 J
164 The substance which is chiefly responsible for the depletion of ozone layer is:
[A] CFCs
[B] O3
[C] CH4
[D] DDT
Answer: CFCs
165 The quality of environment can be improved by-
[A] Conservation
[B] Erosion
[C] Deforestation
[D] Overuse of natural environment
Answer: Conservation
166 Which of the following does not lead to the depletion of groundwater?
[A] Process of afforestation
[B] Process of deforestation
[C] Establishing thermal power plants
[D] Cultivation of high yielding varieties of crops
Answer: Process of afforestation
167 Sardar Sarovar Dam is situated on river:
[A] Ganga
[B] Narmada
[C] Yamuna
[D] Godavari
Answer: Narmada
168 A chemical reaction does not involve:
[A] Formation of new substances having entirely different properties than that of the reactants
[B] Breaking of old chemical bonds and formation of new chemical bonds
[C] Rearrangement of the atoms of reactants to form new products
[D] Changing of the atoms of on element into those of another element to form new products
Answer: Changing of the atoms of on element into those of another element to form new products
169 Sometimes we get painful cramps in our leg muscles after running for a long time due to the accumulation of:
[A] Lactic acid
[B] Carbon dioxide
[C] Hydrochloric acid
[D] Fat
Answer: Lactic acid
170 The plant hormone which triggers the fall of mature leaves and fruits from the plant body is:
[A] Abscisic acid
[B] Cytokinin
[C] Auxin
[D] Gibberellin
Answer: Abscisic acid

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