Question

Heat is flowing through two cylindrical rods of the same material. The diameters of the rods are in the ratio 1 : 2 and the lengths in the ratio 2 : 1. If the temperature difference between the ends is same, then ratio of the rate of flow of heat through them will be

(a) 2:1

(b) 8 : 1

(c) 1 :1

(d) 1 :8

Answer 1

Correct option (d) 1 :8

Explanation:

Ratio of diameters of rod: 1 : 2 and ratio of their lengths 2 : 1.