Question

The wall of a house is made of two different materials of same thickness. The temperature of the outer wall is T₂ and that of inner wall is T₁ < T₂ . The temperature variation inside the wall as shown in the figure. Then :

(A) thermal conductivity of inner wall is greater than that of outer. 

(B) thermal conductivity of outer wall is greater than that of inner 

(C) thermal conductivities of the two are equal 

(D) no conclusion can be drawn about thermal conductivities

Answer 1

Correct option (B) thermal conductivity of outer wall is greater than that of inner

Explanation: 

The slope of temperature variation is more in inner

Larger the conductivity, smaller is the slope.