Question

To explain the stability of atom, Neil’s Bohr, a Danish chemist in 1913 proposed a new

model of atom. The most important concept of this model of atom was that electrons

revolve only in certain fixed orbits around the nucleus without losing energy in the form

of radiations.

(i) The various orbits of an atom are represented in the following order when we move

outwards from the nucleus as –

(a) K, L, N, M b) L, K,M, N c) K, L, M, N d) K, L, N, M

(ii) The distance between the centre of the nucleus till outermost orbit of an atom is called

as

a) Atomic mass b) Atomic radii c) Atomic number

d) None of these

(iii) The nucleus of an atom contains –

a) Only protons b) Only neutrons c) electrons and protons

d) Protons and neutrons

(iv) The entire mass of the atom is concentrated in the -

a) Nucleus b) Shells c) Protons d) Neutrons

(v) As per Bohr’s model of an atom while revolving in a particular orbit, electrons –

a) Gain energy b) lose energy c) Do not radiate energy d) fall into nucleus​

Answer 1

Answer:   i) c     ii) b     iii) b    iv) c     v) c

Explanation: