Test Preparation on Transmission of Heat-I-Physics Test Series For NEET 2020

The two ends of a metal rod are maintained at temperatures
C 0 100 and C 0 110 . The rate of heat flow in the rod is
found to be 4.0 J/s. If the ends are maintained at
temperatures C 0 200 and C 0 210 , the rate of heat flow will
be

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

A metal plate 4 mm thick has a temperature difference of 32°C
between its faces. It transmits 200 kcal /h through an area of
5 . 2 cm Thermal conductivity of the material is-