railway RRB Technician Grade 3 Mock Test 2024 General Science Physics Physical Quantities

A concrete wall of thickness 15 cm has inside temperature 25°C and outside temperature 5°C. The rate of heat loss through per square metre of the wall (thermal conductivity 0.81 J/(s m K)) is:

1
54 J/s
2
163 J/s
3
120 J/s
4
108 J/s
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