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Question

This section contains 1 Assertion-Reason type question, which has 4 choices (A), (B), (C) and (D) out of which ONLY ONE is correct.
A : When a piece of wire is stretched to triple of its length, then its resistance becomes three times.
R : Resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area.
इस खण्ड में 1 कथन-कारण प्रकार का प्रश्न है, जिसमें 4 विकल्प (A), (B), (C) तथा (D) दिये गये हैं, जिनमें से केवल एक सही है।
A : जब तार के एक टुकड़े को खींचकर इसकी लम्बाई के तीन गुना किया जाता है, तब इसका प्रतिरोध तीन गुना हो जाता है।
R : तार का प्रतिरोध इसकी लम्बाई के समानुपाती तथा इसके अनुप्रस्थ-काट क्षेत्रफल के व्युत्क्रमानुपाती होता है।

A
(A) is true but (R) is false
(A) सही है लेकिन (R) गलत है
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B
(A) is false but (R) is true
(A) गलत है लेकिन (R) सही है
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C
Both (A) and (R) are true and (R) is the correct explanation of (A)
(A) तथा (R) दोनों सही हैं तथा (R), (A) का सही स्पष्टीकरण है
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D
Both (A) and (R) are true but (R) is not the correct explanation of (A)
(A) तथा (R) दोनों सही हैं लेकिन (R), (A) का सही स्पष्टीकरण नहीं है
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Solution

The correct option is B (A) is false but (R) is true
(A) गलत है लेकिन (R) सही है
Solution

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