Question

Which one of following is not easy to break?

• A. A chalk
• B. A plastic pen
• C. An iron rod
• D. A wooden plank

Answer 1

The correct option is C

An iron rod

The iron rod is stronger than the other three items.It’s the particles in them which are held by the inter-particle force of attraction. In every substance, there is an inter-particle force of attraction acting between its particles. To break something we have to overcome this intermolecular force. The strength of the force differs from one substance to another.