Past Year (1998 - 2005) MCQs Atoms Physics (2022) NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Q1:

In the Bohr model of

$\mathrm{H\text-}$ atom, an electron

$(e)$ is revolving around a proton

$(p)$ with velocity

$v$ . If

$r$ is the radius of the orbit,

$m$ is the mass and

$\varepsilon_0$ is vacuum permittivity, then the value of

$v$ is:
1.

$\frac{e}{\sqrt{4\pi m\varepsilon_0 r}}$
2.

$\frac{2e}{\sqrt{\pi m\varepsilon_0 r}}$
3.

$\frac{e}{\sqrt{\pi m\varepsilon_0 r}}$
4.

$\frac{e}{4\pi m\varepsilon_0 r}$

Subtopic: Bohr's Model of Atom |

75%

From NCERT

AIPMT - 1998

1

2

3

4

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Q2:

Maximum frequency of emission is obtained for the transition:

1. n = 2 to n = 1

2. n = 6 to n = 2

3. n = 1 to n = 2

4. n = 2 to n = 6

Subtopic: Bohr's Model of Atom |

60%

From NCERT

AIPMT - 2000

1

2

3

4

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Q3:

The life span of atomic hydrogen is:

1. Fraction of one sec

2. One year

3. One hour

4. One day

Subtopic: Bohr's Model of Atom |

83%

From NCERT

AIPMT - 2000

1

2

3

4

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Q4:

When an electron transitions from

$n=4$ to

$n=2,$ then the emitted line in the spectrum will be:

1.	the first line of the Lyman series.
2.	the second line of the Balmer series.
3.	the first line of the Paschen series.
4.	the second line of the Paschen series.

Subtopic: Spectral Series |

87%

From NCERT

AIPMT - 2000

1

2

3

4

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Q5:

If the energy of the hydrogen atom in

$n^{\text{th}}$ orbit is

$E_n,$ then the energy in

$n^{\text{th}}$ orbit of the singly ionised helium atom will be:

1.	$4E_n$	2.	$\dfrac{E_n}{4}$
3.	$2E_n$	4.	$\dfrac{E_n}{2}$

Subtopic: Bohr's Model of Atom |

78%

From NCERT

AIPMT - 2001

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2

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4

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Q6:

An electron is moving around the nucleus of a hydrogen atom in a circular orbit of radius

$r$ . What is the coulomb force

$\vec {F}$ between the two?

$\left ( \text{where},K=\frac{1}{4\pi \epsilon _{0}} \right )$
1.

$K \frac{e^{2}}{r^{2}} \hat{r}$
2.

$- K \frac{e^{2}}{r^{3}} \hat{r}$
3.

$K \frac{e^{2}}{r^{3}} \overset{\rightarrow}{r}$
4.

$- K \frac{e^{2}}{r^{3}} \overset{\rightarrow}{r}$

Subtopic: Various Atomic Models |

56%

From NCERT

AIPMT - 2003

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Q7:

In which of the following systems will the radius of the first orbit ( $n=1$ ) be minimum:
1. doubly ionized lithium
2. singly ionized helium
3. deuterium atom
4. hydrogen atom

Subtopic: Bohr's Model of Atom |

73%

From NCERT

AIPMT - 2003

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2

3

4

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Q8:

Energy $E$ of a hydrogen atom with principal quantum number $n$ is given by $E=-\frac{13.6}{n^{2}}~\text{eV}.$ The energy of a photon ejected when the electron jumps from $n=3$ state to $n=2$ state of hydrogen is approximately:
1. $0.85~\text{eV}$
2. $3.4~\text{eV}$
3. $1.9~\text{eV}$
4. $1.5~\text{eV}$

Subtopic: Bohr's Model of Atom |

80%

From NCERT

AIPMT - 2004

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2

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Q9:

The Bohr model of atoms:

1.	uses Einstein's photoelectric equation.
2.	predicts continuous emission spectra for atoms.
3.	predicts the same emission spectra for all types of atoms.
4.	assumes that the angular momentum of electrons is quantized.

Subtopic: Bohr's Model of Atom |

83%

From NCERT

AIPMT - 2004

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Q10:

The total energy of an electron in the first excited state of a hydrogen atom is about $-3.4~\text{eV}.$ Its kinetic energy in this state will be:
1. $-6.8~\text{eV}$
2. $3.4~\text{eV}$
3. $6.8~\text{eV}$
4. $-3.4~\text{eV}$

Subtopic: Bohr's Model of Atom |

86%

From NCERT

AIPMT - 2005

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