Select Chapter Topics:
Q. No.\(\alpha\text{-}\)particle consists of:
1.
\(2\) protons only.
2.
\(2\) protons and \(2\) neutrons only.
3.
\(2\) electrons, \(2\) protons, and \(2\) neutrons.
4.
\(2\) electrons and \(4\) protons only.
Subtopic: Various Atomic Models |
68%
Level 2: 60%+
NEET - 2019
Hints
Links
The total energy of an electron in the orbit of an atom is \(-3.4~\text{eV}.\) Its kinetic and potential energies are, respectively:
| 1. | \(3.4~\text{eV},~3.4~\text{eV}\) |
| 2. | \(-3.4~\text{eV},~-3.4~\text{eV}\) |
| 3. | \(-3.4~\text{eV},~-6.8~\text{eV}\) |
| 4. | \(3.4~\text{eV},~-6.8~\text{eV}\) |
Subtopic: Bohr's Model of Atom |
87%
Level 1: 80%+
NEET - 2019
Hints
Links
The radius of the first permitted Bohr orbit for the electron in a hydrogen atom is 0.5 Å, and its ground state energy is \(-13.6~\text{eV}.\) If the electron in the hydrogen atom is replaced by a muon \((\mu^{-}),\) which has the same charge as the electron but is \(207\) times more massive, what will be the new values for the first Bohr radius and ground state energy?
| 1. | \(0.53\times10^{-13}~\text{m}, ~-3.6~\text{eV}\) |
| 2. | \(25.6\times10^{-13}~\text{m}, ~-2.8~\text{eV}\) |
| 3. | \(2.56\times10^{-13}~\text{m}, ~-2.8~\text{keV}\) |
| 4. | \(2.56\times10^{-13}~\text{m}, ~-13.6~\text{eV}\) |
Subtopic: Bohr's Model of Atom |
51%
Level 3: 35%-60%
NEET - 2019
Hints
Links
For which one of the following Bohr models is not valid?
| 1. | Singly ionised helium atom \(\big(\mathrm{He}^{+}\big).\) |
| 2. | Deuteron atom. |
| 3. | Singly ionised neon atom \(\big(\mathrm{Ne}^{+}\big).\) |
| 4. | Hydrogen atom. |
Subtopic: Bohr's Model of Atom |
79%
Level 2: 60%+
NEET - 2020
Hints
Links
The total energy of an electron in the \(n^{th}\) stationary orbit of the hydrogen atom can be obtained by:
1. \(E_n = \frac{13.6}{n^2}~\text{eV}\)
2. \(E_n = -\frac{13.6}{n^2}~\text{eV}\)
3. \(E_n = \frac{1.36}{n^2}~\text{eV}\)
4. \(E_n = -{13.6}\times{n^2}~\text{eV}\)
Subtopic: Bohr's Model of Atom |
86%
Level 1: 80%+
NEET - 2020
Hints
Links
Let \(T_1\) and \(T_2\) be the energy of an electron in the first and second excited states of the hydrogen atom, respectively. According to Bohr's model of an atom, the ratio \(T_1:T_2\) is:
| 1. | \(9:4\) | 2. | \(1:4\) |
| 3. | \(4:1\) | 4. | \(4:9\) |
Subtopic: Bohr's Model of Atom |
68%
Level 2: 60%+
NEET - 2022
Hints
Let \(L_1\) and \(L_2\) be the orbital angular momentum of an electron in the first and second excited states of the hydrogen atom, respectively. According to Bohr's model, the ratio \(L_1:L_2\) is:
| 1. | \(1:2\) | 2. | \(2:1\) |
| 3. | \(3:2\) | 4. | \(2:3\) |
Subtopic: Bohr's Model of Atom |
79%
Level 2: 60%+
NEET - 2022
Hints
Let \(R_1\) be the radius of the second stationary orbit and \(R_2\) be the radius of the fourth stationary orbit of an electron in Bohr's model. The ratio of \(\dfrac{R_1}{R_2}\) is:
| 1. | \(0.25\) | 2. | \(0.5\) |
| 3. | \(2\) | 4. | \(4\) |
Subtopic: Bohr's Model of Atom |
80%
Level 1: 80%+
NEET - 2022
Hints
In hydrogen spectrum, the shortest wavelength in the Balmer series is \(\lambda\). The shortest wavelength in the Bracket series is:
1. \(16\lambda\)
2. \(2\lambda\)
3. \(4\lambda\)
4. \(9\lambda\)
1. \(16\lambda\)
2. \(2\lambda\)
3. \(4\lambda\)
4. \(9\lambda\)
Subtopic: Spectral Series |
66%
Level 2: 60%+
NEET - 2023
Hints
The radius of innermost orbit of a hydrogen atom is \(5.3 \times 10^{-11}~\text m.\) What is the radius of the third allowed orbit of a hydrogen atom?
| 1. | \(4.77~ \mathring{A}\) | 2. | \(0.53~ \mathring{A}\) |
| 3. | \(1.06~ \mathring{A}\) | 4. | \(1.59~ \mathring{A}\) |
Subtopic: Bohr's Model of Atom |
76%
Level 2: 60%+
NEET - 2023
Hints
Select Chapter Topics:
© 2026 GoodEd Technologies Pvt. Ltd.