NEET Physics MCQ: NCERT Bohr Model of Atom

🔄Ncert Concepts :Bohr's model of the atom, energy levels, angular momentum quantization

3.

The electric potential between a proton and an electron is given by $V = {V_0}\,\,\ln \,\,\frac{r}{{{r_0}}}$ , where ${r_0}$ is a constant. Assuming Bohr’s model to be applicable, write variation of ${r_n}$ with $n,n$ being the principal quantum number

A

${r_n}\,\, \propto \,\,n$

B

${r_n} \propto 1/n$

C

${r_n}\,\, \propto \,\,{n^2}$

D

${r_n}\,\, \propto \,\,1/{n^2}$

Question Tags

🔄Ncert Concepts :Electric Potential, Bohr's Model, Angular Momentum Quantization

4.

What will be the angular momentum of an electron, if energy of this electron in $H$ -atom is $- 1.5\,\,eV$ (in $J$ - $s$ )

A

$1.05\,\, imes {10^{ - 34}}$

B

$2.1 imes {10^{ - 34}}$

C

$3.15\,\, imes {10^{ - 34}}$

D

$- 2.1\,\, imes {10^{ - 34}}$

Question Tags

🔄Ncert Concepts :Bohr's model, energy levels, angular momentum quantization

5.

The electric potential between a proton and an electron is given by $V = {V_0}\,\,\ln \,\,\frac{r}{{{r_0}}}$ , where ${r_0}$ is a constant. Assuming Bohr’s model to be applicable, write variation of ${r_n}$ with $n,n$ being the principal quantum number

A

${r_n}\,\, \propto \,\,n$

B

${r_n} \propto 1/n$

C

${r_n}\,\, \propto \,\,{n^2}$

D

${r_n}\,\, \propto \,\,1/{n^2}$

Question Tags

🔄Ncert Concepts :Electric Potential, Bohr's Model, Angular Momentum Quantization, Energy Quantization

6.

Energy of an electron in an excited hydrogen atom is $- 3.4\,\,eV$ . Its angular momentum will be $\left( {h = 6.626\,\, imes \,\,{{10}^{ - 34}}\,\,J - s} \right)$

A

$1.11\,\, imes \,\,{10^{34}}\,\,J{\rm{ }}s$

B

$1.51\,\, imes \,\,{10^{ - 31}}\,\,J{\rm{ }}s$

C

$2.11\,\, imes \,\,{10^{ - 34}}\,\,J{\rm{ }}s$

D

$3.72\,\, imes \,\,{10^{ - 34}}\,\,J{\rm{ }}s$

Question Tags

🔄Ncert Concepts :Bohr's model, energy levels, angular momentum quantization

7.

Suppose an electron is attracted towards the origin by a force $\frac{k}{r}$ where ${\rm{'k'}}$ is a constant and ${\rm{'r'}}$ is the distance of the electron from the origin. By applying Bohr model to this system, the radius of the ${{\rm{n}}^{{\rm{th}}}}$ orbital of the electron is found to be ${\rm{'}}{{\rm{r}}_{\rm{n}}}^\prime$ and the kinetic energy of the electron to be ${\rm{'}}{{\rm{T}}_{\rm{n}}}^\prime$ . Then which of the following is true

A

${{\rm{T}}_{\rm{n}}}$ independent of ${\rm{n}},{{\rm{r}}_{\rm{n}}} \propto {\rm{n}}$

B

${{\rm{T}}_{\rm{n}}} \propto \frac{1}{n},{{\rm{r}}_{\rm{n}}} \propto {\rm{n}}$

C

${{\rm{T}}_{\rm{n}}} \propto \frac{1}{n},{{\rm{r}}_{\rm{n}}} \propto {{\rm{n}}^2}$

D

${{\rm{T}}_{\rm{n}}} \propto \frac{1}{{{n^2}}},{{\rm{r}}_{\rm{n}}} \propto {{\rm{n}}^2}$

Question Tags

🔄Ncert Concepts :Bohr model, Centripetal force, Kinetic energy, Angular momentum quantization

8.

In the lowest energy level of hydrogen atom, the electron has the angular momentum

A

$\pi /h$

B

$h/\pi$

C

$h/2\pi$

D

$2\pi /h$

Question Tags

🎓 Ncert Level:Remembering

⚡ Time Required :1 mins

🔄Ncert Concepts :Bohr's model, angular momentum quantization

9.

What will be the angular momentum of an electron, if energy of this electron in $H$ -atom is $- 1.5\,\,eV$ (in $J$ - $s$ )

A

$1.05\,\, imes {10^{ - 34}}$

B

$2.1 imes {10^{ - 34}}$

C

$3.15\,\, imes {10^{ - 34}}$

D

$- 2.1\,\, imes {10^{ - 34}}$

Question Tags