Question

When the temperature of a body increases

• A. density and moment of inertia increase
• B. density and moment of inertia decrease
• C. density decreases and moment of inertia increases.
• D. Density increases and moment of inertia decreases

Answer 1

Answer: (C)

On heating, the surface area and volume usually increase. Since the mass of the body remain unchanged so the density decreases as a consequence. Again, with the increase of temperature the radius or length of a body increases which caused to increase the moment of inertia since moment of inertia is proportional to the square of radius.