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- Question
Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Most of the Himalayan rivers are perennial. Reason (R) : They are fed by melting snow.
Options- A. Both A and R are true and R is the correct explanation of A.
- B. Both A and R are true but R is NOT the correct explanation of A.
- C. A is true but R is false.
- D. A is false but R is true.
- Correct Answer
- Both A and R are true and R is the correct explanation of A.
ExplanationMost Himalayan rivers originating in Himalayan peaks are perennial because they are fed by the melting snow throughout the year.
- 1. Assertion(A) : Indus valley people knew the art of navigation. Reason(R) : Indus valley seals indicate prevalence of overseas trade.
Options- A. R is true but A is fale
- B. A is true but R is false
- C. Both A and R are false
- D. R correctly explains A Discuss
- 2. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Legumes revive the soil fertility. Reason (R) : Microbes in the root nodules of legumes fix the atmospheric nitrogen.
Options- A. Both A and R are true and R is the correct explanation of A.
- B. Both A and R are true but R is NOT the correct explanation of A.
- C. A is true but R is false.
- D. A is false but R is true. Discuss
- 3. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : We feel comfortable in hot and humid climate. Reason (R) : Sweat evaporates faster in humid climate.
Options- A. Both A and R are true and R is the correct explanation of A.
- B. Both A and R are true but R is NOT the correct explanation of A.
- C. A is true but R is false.
- D. Both A and R are false. Discuss
- 4. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : When the bus starts, the person inside it falls forward. Reason (R) : The bus pushes the man forward.
Options- A. Both A and R are true and R is the correct explanation of A.
- B. Both A and R are true but R is NOT the correct explanation of A.
- C. A is true but R is false.
- D. Both A and R are false. Discuss
- 5. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion(A) : Graphite is slippery and used as a lubricant. Reason (R) : Graphite has free electrons.
Options- A. Both A and R are true and R is the correct explanation of A.
- B. Both A and R are true but R is NOT the correct explanation of A.
- C. A is true but R is false.
- D. A is false but R is true. Discuss
- 6. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : There is no vaccine for AIDS. Resson (R) : The AIDS virus changes its genetic code
Options- A. Both A and R are true and R is the correct explanation of A.
- B. Both A and R are true but R is NOT the correct explanation of A.
- C. A is true but R is false.
- D. A is false but R is true. Discuss
- 7. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion(A) : Increase in carbon dioxide would melt polar ice. Reason (R) : Global temperature would rise
Options- A. Both A and R are true and R is the correct explanation of A.
- B. Both A and R are true but R is NOT the correct explanation of A.
- C. A is true but R is false.
- D. A is false but R is true. Discuss
- 8. Assertion(A) : Most of the Himalayan rivers are perennial. Reason(R) : They are fed by melting snow.
Options- A. R correctly explains A
- B. R is true but A is fale
- C. A is true but R is false
- D. Both A and R are false Discuss
- 9. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Carbon monoxide when inhaled causes death. Reason (R) : Carbon monoxide combines with haemoglobin.
Options- A. Both A and R are true and R is the correct explanation of A.
- B. Both A and It are true but R is NOT the correct explanation of A.
- C. A is true but R is false.
- D. A is false but R is true. Discuss
- 10. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Glass tumbler breaks in winter when hot water is poured in it. Reason (R) : When hot water is poured. the outer surface of glass expands.
Options- A. Both A and R are true and R is the correct explanation of A.
- B. Both A and R are true but R is NOT the correct explanation of A.
- C. A is true but R is false.
- D. A is false but R is true. Discuss
Assertion and Reason problems
Search Results
Correct Answer: R correctly explains A
Explanation:
The seals found at Indus valley sites gave evidance of overseas trade, which was possible only with the knowledge of art of navigation.
Thus, both A and R are true & R correctly explains A.
Correct Answer: Both A and R are true and R is the correct explanation of A.
Explanation:
The root nodules of leguminous plants contain certain nitrogen fixing bacteria which absorb the atmospheric nitrogen and convert it into nitrogeneous compounds useful for the plants reviving soil fertility.
Correct Answer: Both A and R are false.
Explanation:
We feel uncomfortable in hut and humid climate because in hot weather, body sweats more but due to high humidity, this sweat does not evaporate easily.
Correct Answer: Both A and R are false.
Explanation:
When the bus starts, the person inside it falls backward because the bus moves forward but due to the property of inertia, the man tends to be in the initial Mate of rest.
Correct Answer: Both A and R are true but R is NOT the correct explanation of A.
Explanation:
Graphite possesses a layer structure with two successive layers held by weak forces and able to slide over one another. So, graphite is slippery and this property finds its use as a lubricant. In graphite, each carbon atom is linked to three other carbon atoms while one electron in the carbon atom is delocalised. So, graphite has free electrons
Correct Answer: Both A and R are true and R is the correct explanation of A.
Explanation:
A vaccine contains the inactivated germs of the disease. But the AIDS virus changes its genetic code and so on vaccine has been invented for it.
Correct Answer: Both A and R are true and R is the correct explanation of A.
Explanation:
The carbon dioxide envelope in earth's atmosphere traps the heat. With increase in the proportion of carbon dioxide, therefore, the global temperature would rise, thus causing the polar ice to melt
Correct Answer: R correctly explains A
Explanation:
Most Himalayan rivers are perennial because they are fed by the melting snow throughout the year.
Thus, both A and R are true & R correctly explains A.
Correct Answer: Both A and R are true and R is the correct explanation of A.
Explanation:
Carbon monoxide, when inhaled, combines with haemoglobin of blood to form carboxyhaemoglobin which inhibits the transport of oxygen.
Correct Answer: A is true but R is false.
Explanation:
When in winter, hot water is poured in the glass tumbler. its inner surface tends to expand while the Outer surface in contact with cold atmosphere does not. This opposite interaction causes the tumbler to break.
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