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

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Questions
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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