### Bohr's Model of an Atom - MCQ Practice Set

01. According to Bohr's model of an atom, electrons move in specific orbits called: a) Energy orbits b) Quantum orbits c) Stationary states d) Angular orbits Answer: c) Stationary states Explanation: Bohr proposed that electrons revolve around the nucleus only in certain selected circular paths called stationary states or orbits. These orbits are associated with definite energies and are also known as energy levels or quantum levels. 02. Which principle of Bohr's model states that only certain orbits are permitted in which angular momentum of the electron is a whole number multiple of h/2π? a) Stationary principle b) Quantized energy levels c) Angular momentum quantization d) Radiation emission principle Answer: c) Angular momentum quantization Explanation: Bohr's model introduced the principle of angular momentum quantization, stating that only specific orbits are allowed where the angular momentum of the electron is a whole number multiple of h/2π, where 'h' is Pl