?Particle which can be added to the nucleus of an atom without changing its chemical properties are
1). Electrons
2). protons
3). Neutrons
4). $alpha$ -particles
1. Quality of a musical note depends on
2. The weakest of all fundamental forces is
3. Colours of thin films are due to?
6. Steam at 100°C causes more severe burns than water at 100°C because
8. A 'Market Economy' is one which
9. Alternating current is converted into direct current by a