Thermal Expansion Practice Questions

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Thermodynamics Learning Material
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Questions
13.2Thermal Expansion

Physics Revision Questions for Thermal Expansion

1) A long nickel bar elongates by 3 mm when its temperature increases by 130 K. What was the original length of the bar if the coefficient of linear expansion for nickel is 13 × 10-6 K-1?

  1. 0.520 m
  2. 0.658 m
  3. 1.923 m
  4. 1.520 m

Correct Answer: C

2) The coefficient of thermal expansion for nylon is 100 × 10-6 K-1. How many square centimeters a nylon cloth of area equal to 0.4 m2 will shrink if the environment's temperature decreases by 20°C?

  1. 40 cm2
  2. 160 cm2
  3. 0.0016 cm2
  4. 16 cm2

Correct Answer: D

3) A bimetallic strip (at 20°C) made of one platinum and one gold bar of equal lengths is shown in the figure below.

Physics Tutorials: This image provides visual information for the physics tutorial Thermal Expansion

The linear coefficient of thermal expansion for gold is 14.2 × 10-6 K-1 and that of platinum is 9 × 10-6 K-1. What is the shape of the bimetallic strip when it cools down to -40°C?

Physics Tutorials: This image provides visual information for the physics tutorial Thermal Expansion

Correct Answer: C

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