Four materials P, Q, R and S have thermal conductivities ,

PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

Four materials P, Q, R and S have thermal conductivities

0.04\,\text{W m}^{-1}\text{K}^{-1}

0.12\,\text{W m}^{-1}\text{K}^{-1}

0.80\,\text{W m}^{-1}\text{K}^{-1}

and

1.50\,\text{W m}^{-1}\text{K}^{-1}

respectively. When used in equal thickness, their order from best insulator to worst insulator is (a)

S, R, Q, P

(b)

Q, P, R, S

(c)

P, Q, R, S

(d)

P, R, Q, S