1.  2

2.  4

3.  $\frac{1}{2}$

4.  $\frac{1}{4}$

Concept Questions :-

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

Difficulty Level:

The shortest wavelength of Balmer series is about

1.  912$\stackrel{\mathrm{o}}{\mathrm{A}}$

2.  121$\stackrel{\mathrm{o}}{\mathrm{A}}$

3.  3648$\stackrel{\mathrm{o}}{\mathrm{A}}$

4.  4864$\stackrel{\mathrm{o}}{\mathrm{A}}$

Concept Questions :-

Spectral series
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

1.

2.

3.

4.  $\sqrt{{\lambda }_{1}{\lambda }_{2}}$

Concept Questions :-

Spectral series
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The angular speed of electron in a hydrogen atom in ${\mathrm{n}}^{\mathrm{th}}$ orbit is proportional to -

1.

2.

3.

4.  ${\mathrm{n}}^{2}$

Concept Questions :-

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

Difficulty Level:

Which of the following transition in a hydrogen atom will produce radiations of minimum wavelength?

1.  n = 2 to n = 1

2.  n = 5 to n = 3

3.  n = 10 to n = 5

4.  n = 10 to n = 3

Concept Questions :-

Spectral series
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The frequency Of radiation emitted during the transition of an electron from a second excited state to a first excited state in H-atom is ${\mathrm{f}}_{0}.$ The frequency of the same transition emitted by a singly ionized He ion is

1.

2.

3.

4.  $\frac{{\mathrm{f}}_{0}}{4}$

Concept Questions :-

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

Difficulty Level:

When the electron of a hydrogen-like atom jumps from a higher energy level to a lower energy level, then

1.  Angular momentum of the electron remains constant

2.  The kinetic energy of the electron increases

3.  The wavelength of the de-Broglie wave associated with the motion of the electron increases

4.  Potential energy increases

Concept Questions :-

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

Difficulty Level:

The energy of a hydrogen atom in its ground state is —13.6 eV. The energy of the level corresponding to the quantum number n = 2 (first excited state) in the hydrogen atom is:

1. -2.72 eV

2. - 0.85 eV

3. -0.54 eV

4. — 3.4 eV

Concept Questions :-

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

Difficulty Level:

When neutron moving with Kinetic Energy 2eV collides with

stationary ${H}_{1}^{1}$ in the ground state, the collision will be:

1.  Must be elastic

2.  may be inelastic

3.  Both

4.  Must be perfectly inelastic

Concept Questions :-

Various atomic model
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The potential difference applied to an X-ray tube is 5 kV and current through it is 3.2 mA. The number of electrons striking the target per sec is:

1.

2.

3.

4.

Concept Questions :-

X-ray