Which of the following bodies, each with centre of gravity G, lying on a horizontal table, is/are in unstable equilibrium?

A. II only
B. III only
C. I & IV only
D. II & III only

Correct Answer: Option B

B. III only

Explanation

– I & II are in neutral equilibrium. They will roll continuously on the table
– III is a body with high centre of gravity (unstable)
– IV is a body with high centre of gravity (stable)