General instructions same as in chapter 1.
Assertion:An electron jumps from lower to higher orbit in an atom.
Reason:The electron absorbs energy to jump from lower to higher orbit.

General instruction same as in chapter 1. Assertion: Electrons move away from a low potential to high potential region. Reason:Because electrons has negative charge.

When an electron jumps from L to K shell -

General instructions same as in chapter 1. Assertion: An atom has equal number of electrons and protons. Reason:In an atom there are equal number of electrons, protons and neutrons.

Given instructions same as in chapter 1. Assertion: Photoelectric effect demonstrates the particles nature of light. Reason:The number of photoelectrons is proportional to the frequency of light.

General instructions same as in chapter 1. Assertion:A convex mirror cannot form real images. Reason:Convex mirror converges the parallel rays that are incident on it.

General instructions same as iin chapter 1. Assertion:A bar magnet exerts a torque on itself due to its own field. Reaons: Magnetic field due to a magnet is uniform.

General instructions same as in chapter 1. Assertion:Large angle scattering of alpha particle led to the discovery of atomic nucleus. Reason:Entire positive charge of atom is concentrated in the central core.

General instruction same as in chapter 1. Assertion:In two half life of a radioactive sample, all nuclei will decay. Reason:Half life T=(dN)/(dt) .

General instructions same as in chapter 1. Assertion:Corpuscular theory fails in explaning the velocities of light in air and water. Reason:According to corpuscular theory, light should travel faster in denser medium than in rarer medium.