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- Question
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.
- Correct Answer
- Both A and R are true and R is the correct explanation of A.
ExplanationMagnesium chloride present in common salt is a deliquescent substance i.e. it absorbs moisture from the air when kept in open.
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. 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
- 6. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion(A) : Tamil Nadu gets most of the rainfall in winter. Reason (R) : Tamil Nadu gets rainfall from retreating monsoons.
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) : Razia Sultan was the daughter of Iltutmish. Reason (R) : Iltutmish was a rebel.
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. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : The Indian Constitution came into force with effect from 26th January. 1950. Reason (R) : 26th January is celebrated as the Republic Day.
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
- 9. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : Silver is not used to make electric wires. Reason (R) : Silver is a bad conductor.
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
- 10. Directions : For the Assertion (A) and Reason (R) below, choose the correct alternative Assertion (A) : a Vaccines prevent diseases. Reason (R) : Vaccines must be given to children.
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 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: 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: 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: 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: 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.
Correct Answer: Both A and R are true and R is the correct explanation of A.
Explanation:
Rainfall in Tamil Nadu is caused by the retreating monsoons which occur in winter.
Correct Answer: A is true but R is false.
Explanation:
litutmish was a ruler of slave dynasty and Razia was his daughter.
Correct Answer: Both A and R are true but R is NOT the correct explanation of A.
Explanation:
The Indian Constitution came into force with effect from January 26, 1950 and since then this day is celebrated as the Republic Day.
Correct Answer: A is true but R is false.
Explanation:
Silver is a good conductor of electricity but it is not used to make electric wires because it is expensive
Correct Answer: Both A and R are true but R is NOT the correct explanation of A.
Explanation:
Vaccines prevent diseases by developing immunity inside the body and vaccines must be given to children to build in them a resistance against diseases.
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