Thermal Properties of Matter - Result Question 20

20. Two metal rods 1 and 2 of same lengths have same temperature difference between their ends. Their thermal conductivities are K1 and K2 and cross sectional areas A1 and A2, respectively. If the rate of heat conduction in rod1 is four times that in rod 2, then

[NEET Kar. 2013]

(a) K1A1=K2A2

(b) K1A1=4K2A2

(c) K1A1=2K2A2

(d) 4K1A1=K2A2

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Answer:

Correct Answer: 20. (b)

Solution:

(b) Q1=4Q2 (Given)

K1A1ΔtL=4K2A2ΔtLK1A1=4K2A2.



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