railway RRB JE (CBT I + CBT II) Mock Test 2024 Heat Transfer Conduction Fourier Law and Thermal Conductivity
Consider the following statements for the thermal conductivity of a material.
1. The thermal conductivity of the metal increases with the increase in temperature
2. The thermal conductivity of gases and liquids increases and decreases respectively with the increase in temperature.
3. It is Is directly proportional to the cross-sectional area.
Which of the following statements are correct?
1
only 1
2
1 and 2 only
3
2 only
4
3 only