For electron moving in ${\mathrm{n}}^{\mathrm{th}}$ orbit of H-atom the angular velocity is proportional to
(a) n                       (b) 1/n
(c) ${\mathrm{n}}^{3}$                     (d) 1/${\mathrm{n}}^{3}$

Concept Questions :-

Bohr's model of atom

Difficulty Level:

The energy of electron in first excited state of H-atom is -3.4 eV its kinetic energy is

(a) – 3.4 eV                 (b) + 3.4 eV
(c) – 6.8 eV                 (d) 6.8 eV

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Which of the following phenomena suggests the presence of electron energy levels in atoms

(b) Isotopes

(c) Spectral lines

(d) $\mathrm{\alpha }$-particles scattering

Concept Questions :-

Various atomic model

Difficulty Level:

Which of the following spectral series in hydrogen atom give spectral line of 4860 Å
(a) Lyman               (b) Balmer
(c) Paschen             (d) Brackett

Concept Questions :-

Spectral series

Difficulty Level:

When an electron in hydrogen atom is excited, from its 4th to 5th stationary orbit, the change in angular momentum of electron is (Planck’s constant: h = 6.6)

(a)                (b)
(c)                (d)

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The concept of stationary orbits was proposed by

(a) Neil Bohr              (b) J.J. Thomson
(c) Ruther ford           (d) I. Newton

Concept Questions :-

Various atomic model

Difficulty Level:

What will be the angular momentum of a electron, if energy of this electron in H-atom is 1.5eV (in J-sec)
(a) $1.05×{10}^{-34}$           (b) $2.1×{10}^{-34}$
(c) $3.15×{10}^{-34}$           (d)  $-2.1×{10}^{-34}$

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Who discovered spin quantum number
(a) Unlenbeck and Goudsmit
(b) Nell’s Bohr
(c) Zeeman
(d) Sommerfield

Concept Questions :-

Various atomic model

Difficulty Level:

The time of revolution of an electron around a nucleus of charge Ze in nth Bohr orbit is directly proportional to

(a) n             (b) $\frac{{\mathrm{n}}^{3}}{{\mathrm{Z}}^{2}}$
(c) $\frac{{\mathrm{n}}^{2}}{\mathrm{Z}}$          (d) $\frac{\mathrm{Z}}{\mathrm{n}}$

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In Bohr’s model, if the atomic radius of the first orbit is ${\mathrm{r}}_{0}$, then the radius of the fourth orbit is
(a) ${\mathrm{r}}_{0}$              (b) 4${\mathrm{r}}_{0}$
(c) ${\mathrm{r}}_{0}$/16          (d) 16${\mathrm{r}}_{0}$

Concept Questions :-

Bohr's model of atom