The coefficient of superficial expansion of a solid is 2 × 10–5 /°C. It's coefficient of linear expansion is

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1.
The coefficient of superficial expansion of a solid is 2 × 10^–5 /°C. It's coefficient of linear expansion is

1. 4 × 10–5/°C2. 3 × 10–5/°C3. 2 × 10–5/°C4. 1 × 10–5/°C

2.
An iron bar of length 10 m is heated from 0°C to 100°C. If the coefficient of linear expansion of iron is 10 × 10^–6/°C, the increase in the length of bar is

1. 0.5 cm2. 1.0 cm3. 1.5 cm4. 2.0 cm

3.
The coefficient of linear expansion of crystal in one direction is α₁and that in every direction perpendicular to it is α₂. The coefficient of cubical expansion is

1. α1 + α22. 2α1 + α23. α1 + 2α24. None of these

4.
The coefficient of performance of a Carnot refrigerator working between 30 °C and 0 °C is

1. 102. 13. 94. 0

5.
A 10 metric ton truck drives up a hilly road of inclination 45° at a speed of 36 km h^–1. If the coefficient of kinetic friction between the road and tyres is 0.2, calculate the power delivered by the engine (g = 10 ms^–2)

1. 2. 3. 4.

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The coefficient of superficial expansion of a solid is 2 × 10–5 /°C. It's coefficient of linear expansion is