Q. No.A particle of mass \(m\) is moving around the origin with a constant force \(F\) pulling it towards the origin. If Bohr model is used to describe its motion, the radius \(r\) of the \(n^{\text{th}}\) orbit and the particle's speed \(v\) in the orbit depend on \(n\) as:
| 1. | \(r \propto n^{2/3}; v \propto n^{1/3}\) |
| 2. | \(r \propto n^{4/3}; v \propto n^{-1/3}\) |
| 3. | \(r \propto n^{1/3}; v \propto n^{1/3}\) |
| 4. | \(r \propto n^{1/3}; v \propto n^{2/3}\) |
Subtopic: Bohr's Model of Atom |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch List I with List II.
Choose the correct answer from the options given below:
| List I (Spectral Lines of Hydrogen for transitions from) |
List II (Wavelength (nm)) |
||
| \(\mathrm{A.}\) | \(n_2=3\) to \(n_1=2\) | \(\mathrm{I.}\) | \(410.2\) |
| \(\mathrm{B.}\) | \(n_2=4\) to \(n_1=2\) | \(\mathrm{II.}\) | \(434.1\) |
| \(\mathrm{C.}\) | \(n_2=5\) to \(n_1=2\) | \(\mathrm{III.}\) | \(656.3\) |
| \(\mathrm{D.}\) | \(n_2=6\) to \(n_1=2\) | \(\mathrm{IV.}\) | \(486.1\) |
Choose the correct answer from the options given below:
| 1. | \(\mathrm{A - III, B - IV, C - II, D - I}\) |
| 2. | \(\mathrm{A - IV, B - III, C - I, D - II}\) |
| 3. | \(\mathrm{A - I, B - II, C - III, D - IV}\) |
| 4. | \(\mathrm{A - II, B - I, C - IV, D - III}\) |
Subtopic: Spectral Series |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyGiven below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below:
| Statement I: | Atoms are electrically neutral as they contain equal number of positive and negative charges. |
| Statement II: | Atoms of each element are stable and emit their characteristic spectrum. |
In the light of the above statements, choose the most appropriate answer from the options given below:
| 1. | Both Statement I and Statement II are incorrect. |
| 2. | Statement I is correct but Statement II is incorrect. |
| 3. | Statement I is incorrect but Statement II is correct. |
| 4. | Both Statement I and Statement II are correct. |
Subtopic: Spectral Series |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch List-I (Spectral Series) with List-II (corresponding wave number expressions).
Choose the correct answer from the options given below:
| List-I (Series) |
List-II (Wave number in \(\text{cm}^{–1}\)) |
||
| A. | Balmer series | I. | \( R\left(\dfrac{1}{1^2}-\dfrac{1}{n^2}\right) \) |
| B. | Lyman series | II. | \( R\left(\dfrac{1}{4^2}-\dfrac{1}{n^2}\right) \) |
| C. | Brackett series | III. | \( R\left(\dfrac{1}{5^2}-\dfrac{1}{n^2}\right) \) |
| D. | Pfund series | IV. | \( R\left(\dfrac{1}{2^2}-\dfrac{1}{n^2}\right)\) |
| 1. | A-I, B-IV, C-III, D-II |
| 2. | A-II, B-III, C-IV, D-I |
| 3. | A-IV, B-I, C-II, D-III |
| 4. | A-III, B-II, C-I, D-IV |
Subtopic: Spectral Series |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe spectral series which corresponds to the electronic transition from the levels \({n}_{2}=5,6,\ldots \) to the level \({n}_{1}=4\mathrm~\) is:
| 1. | Pfund series | 2. | Brackett series |
| 3. | Lyman series | 4. | Balmer series |
Subtopic: Spectral Series |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySome energy levels of a molecule are shown in the figure with their wavelengths of transitions.
Then:
Then:
| 1. | \(\lambda_{3}>\lambda_{2},\lambda_{1}=2\lambda_{2}\) | 2. | \(\lambda_{3}>\lambda_{2},\lambda_{1}=4\lambda_{2}\) |
| 3. | \(\lambda_{1}>\lambda_{2},\lambda_{2}=2\lambda_{3}\) | 4. | \(\lambda_{2}>\lambda_{1},\lambda_{2}=2\lambda_{3}\) |
Subtopic: Spectral Series |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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. \(1.59~ \mathring{A}\)
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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe ground state energy of a hydrogen atom is \(-13.6~\text{eV}.\) The energy needed to ionize the hydrogen atom from its second excited state will be:
1. \(13.6~\text{eV}\)
2. \(6.8~\text{eV}\)
3. \(1.51~\text{eV}\)
4. \(3.4~\text{eV}\)
1. \(13.6~\text{eV}\)
2. \(6.8~\text{eV}\)
3. \(1.51~\text{eV}\)
4. \(3.4~\text{eV}\)
Subtopic: Bohr's Model of Atom |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe wavelength of the Lyman series of hydrogen atom appears in:
| 1. | visible region |
| 2. | far infrared region |
| 3. | ultraviolet region |
| 4. | infrared region |
Subtopic: Spectral Series |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
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