railway RRB Technician Grade 1 Mock Test 2024 Physics Thermal Properties of Matter Temperature and heat
Choose the necessary conditions for the heat transfer:
Statement 1: There must be a heat-conducting material between two bodies for heat transfer
Statement 2: There must be a temperature difference between two bodies for heat transfer
Statement 3: The material must be made of metal between two bodies for heat flow1
Only 1 is correct
2
Only 2 is correct
3
Both 1 and 2 are correct
4
All 1, 2 and 3 are correct