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- Question
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.
- Correct Answer
- A is true but R is false.
ExplanationWhen 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.
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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. Discuss
- 6. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Cotton is grown in alluvial soils. Reason (R) : Alluvial soils are very fertile.
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) : A little gap is left between iron rails. Reason (R) : Iron expands in summer.
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) : The pouring of kerosene oil on stagnant pools helps to eradicate malaria. Reason(R) : The kerosene oil is poisonous for the mosquitoes.
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. Assertion(A) : The steam engine was invented by James Watt. Reason(R) : There was a problem of taking out water from flooded mines.
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
- 10. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion(A) : When common salt is kept open, it absorbs moisture from the air. Reason (R) : Common salt contains magnesium chloride.
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: 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: 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:
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: 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:
Most Himalayan rivers originating in Himalayan peaks are perennial because they are fed by the melting snow throughout the year.
Correct Answer: Both A and R are true and R is the correct explanation of A.
Explanation:
Alluvial soils comprising of silt and sand carried down by the rivers, are very fertile. However, cotton is grown in black soil that suits its mineral requirements
Correct Answer: Both A and R are true and R is the correct explanation of A.
Explanation:
Iron expands in summer. So, gaps are left between rails to allow for expansion.
Correct Answer: A is true but R is false
Explanation:
The kerosene oil sprayed on the water provodes a thin cating and the larvae of the mosquitoes are prevented from coming up to breathe. Thus, they die.
Hence, A is true but R is false.
Correct Answer: R correctly explains A
Explanation:
The problem of pumping out water from the flooded mines provided the need of self-working engine, which led James Watt to invent the same.
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:
Magnesium chloride present in common salt is a deliquescent substance i.e. it absorbs moisture from the air when kept in open.
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