Select Chapter Topics:
Q. No.Which statement about the Rutherford model of the atom is not true?
| 1. | There is a positively charged centre in an atom called the nucleus. |
| 2. | Nearly all the mass of an atom resides in the nucleus. |
| 3. | The size of the nucleus is the same as that of the atom. |
| 4. | Electrons occupy the space surrounding the nucleus. |
Subtopic: Various Atomic Models |
90%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
In a Rutherford scattering experiment, when a projectile of charge \(Z_1\) and mass \(M_1\) approaches a target nucleus of charge \(Z_2\) and mass \(M_2\), the distance of the closest approach is \(r_0\). The energy of the projectile is:
| 1. | directly proportional to \(M_1M_2\). |
| 2. | directly proportional to \(Z_1Z_2\). |
| 3. | inversely proportional to \(Z_1\). |
| 4. | directly proportional to mass \(M_1\). |
Subtopic: Various Atomic Models |
84%
Level 1: 80%+
AIPMT - 2009
Hints
Links
Given below are two statements:
| Statement I: | The scattering of α-particles at large angles is primarily due to the atomic nucleus. |
| Statement II: | The atomic nucleus is very heavy in comparison to electrons. |
| 1. | Statement I is correct and Statement II is incorrect. |
| 2. | Statement I is incorrect and Statement II is correct. |
| 3. | Both Statement I and Statement II are correct. |
| 4. | Both Statement I and Statement II are incorrect. |
Subtopic: Various Atomic Models |
83%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
As compared to \(^{12}\mathrm{C}\) atoms, \(^{14}\mathrm{C}\) atom has:
| 1. | two extra protons and two extra electrons. |
| 2. | two extra protons but no extra electrons. |
| 3. | two extra neutrons but no extra electrons. |
| 4. | two extra neutrons and two extra electrons. |
Subtopic: Various Atomic Models |
80%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
An alpha nucleus of energy \({1 \over 2 } mv^2\) bombards a heavy nuclear target of charge \(Ze\). Then the distance of the closest approach for the alpha nucleus will be proportional to:
1. \(v^2\)
2. \(1/ v^4\)
3. \(1 /m\)
4. \(1/Ze\)
1. \(v^2\)
2. \(1/ v^4\)
3. \(1 /m\)
4. \(1/Ze\)
Subtopic: Various Atomic Models |
79%
Level 2: 60%+
NEET - 2010
Hints
What is the minimum orbital angular momentum of an electron in a hydrogen atom?
| 1. | \(h\) | 2. | \(\dfrac{h}{2}\) |
| 3. | \(\dfrac{h}{2 \pi}\) | 4. | \(\dfrac{h}{\lambda}\) |
Subtopic: Bohr's Model of Atom |
92%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
The velocity of an electron in the seventh orbit of a hydrogen-like atom is \(3.6\times 10^6\) m/s. The velocity of the electron in the \(3^{\text{rd}}\) orbit is:
1. \( 4.2 \times 10^6 ~\text{m/s} \)
2. \( 8.4 \times 10^6 ~\text{m/s} \)
3. \( 2.1 \times 10^6~\text{m/s} \)
4. \( 3.6 \times 10^6 ~\text{m/s} \)
1. \( 4.2 \times 10^6 ~\text{m/s} \)
2. \( 8.4 \times 10^6 ~\text{m/s} \)
3. \( 2.1 \times 10^6~\text{m/s} \)
4. \( 3.6 \times 10^6 ~\text{m/s} \)
Subtopic: Bohr's Model of Atom |
87%
Level 1: 80%+
JEE
Please attempt this question first.
Hints
Please attempt this question first.
Which of the following statements correctly describes Bohr's model of the atom?
| 1. | It incorporates Einstein’s photoelectric equation. |
| 2. | It predicts a continuous emission spectrum for atoms. |
| 3. | The quantization of angular momentum is a key postulate of Bohr's model. |
| 4. | It predicts identical emission spectra for all types of atoms. |
Subtopic: Bohr's Model of Atom |
87%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
The magnetic moment generated by the movement of an electron in the \(n^{\text{th}}\) Bohr orbit is \(\mu_n.\) Then,
| 1. | \(\mu_n\propto n\) |
| 2. | \(\mu_n\propto n^2\) |
| 3. | \(\mu_n\propto {\Large\frac{1}{n}}\) |
| 4. | \(\mu_n\propto {\Large\frac{1}{n^2}}\) |
Subtopic: Bohr's Model of Atom |
88%
Level 1: 80%+
Hints
The radius of the innermost electron orbit in a hydrogen atom is \(5.3\times 10^{-11}~\text{m}.\) What is the radius of the third orbit?
| 1. | \(11.3\times 10^{-11}\) m | 2. | \(12.9\times 10^{-11}\) m |
| 3. | \(15.9\times 10^{-11}\) m | 4. | \(47.7\times 10^{-11}\) m |
Subtopic: Bohr's Model of Atom |
86%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.
Select Chapter Topics:
© 2026 GoodEd Technologies Pvt. Ltd.