railway RRB Technician Grade 1 Mock Test 2024 Physics Thermal Properties of Matter Heat transfer

The thermal conductivities of brick and pine wood are, respectively 0.6 and 0.13 W/(m.°C). What thickness of brick has the same insulating ability at 5 cm of pine?

1

23 cm

2

4.6 cm

3

30 cm

4

5 cm

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