Class JEE Mathematics Practice Q #715
COMPETENCY BASED
APPLY
4 Marks 2020 ASSERTION REASON
Assertion: Assertion: The boiling point of water is higher at lower elevations. Reason: Atmospheric pressure increases as elevation decreases.
(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.
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Correct Answer: Both true and R explains A
Explanation
Boiling occurs when vapor pressure equals atmospheric pressure. Higher pressure requires higher temperature.

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Step-by-Step Solution

  1. Analyze the Assertion: The boiling point of water is *lower* at higher elevations, not higher at lower elevations. This is because at higher elevations, the atmospheric pressure is lower. Lower atmospheric pressure means less force is required for the water to reach its vapor pressure and boil. Therefore, the assertion is incorrect.
  2. Analyze the Reason: Atmospheric pressure *decreases* as elevation increases. This is because there is less air above you at higher elevations, resulting in less weight pressing down. Therefore, the reason is also incorrect.
  3. Determine the Relationship: Since both the assertion and the reason are incorrect, and there is no causal relationship between them as stated, the correct answer is that both are false.

Correct Answer: Both Assertion and Reason are false.<\/strong>

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Pedagogical Audit
Bloom's Analysis: This is an APPLY question because it requires the student to apply their understanding of the relationship between atmospheric pressure, elevation, and boiling point to evaluate the given assertion and reason.
Knowledge Dimension: CONCEPTUAL
Justification: The question tests the understanding of the relationship between atmospheric pressure, elevation, and boiling point, which are all interconnected concepts.
Syllabus Audit: In the context of JEE, this is classified as COMPETENCY. This question assesses the student's ability to apply scientific concepts to a real-world scenario, rather than simply recalling factual information from the textbook.

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