Past Year (2016 - 2018) MCQs Atoms Physics NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Q1:

The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is:
1. $1:1$
2. $1:-1$
3. $2:-1$
4. $1:-2$

Subtopic: Bohr's Model of Atom |

80%

From NCERT

NEET - 2018

1

2

3

4

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Q2:

The ratio of wavelengths of the last line of the Balmer series and the last line of the Lyman series is:
1. $1$
2. $4$
3. $0.5$
4. $2$

Subtopic: Spectral Series |

77%

From NCERT

NEET - 2017

1

2

3

4

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Q3:

If an electron in a hydrogen atom jumps from the

3^{rd}

$3^{\text{rd}}$ orbit to the

2^{nd}

$2^{\text{nd}}$ orbit, it emits a photon of wavelength

λ

$\lambda$

. When it jumps from the

4^{th}

$4^{\text{th}}$ orbit to the

3^{rd}

$3^{\text{rd}}$ orbit, the corresponding wavelength of the photon will be:

1.	$\frac{16}{25}\lambda$	2.	$\frac{9}{16}\lambda$
3.	$\frac{20}{7}\lambda$	4.	$\frac{20}{13}\lambda$

Subtopic: Bohr's Model of Atom |

79%

From NCERT

NEET - 2016

1

2

3

4

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Q4:

Given that the value of the Rydberg constant is

10^{7} m^{- 1},

$10^{7}~\text{m}^{-1},$ what will be the wave number of the last line of the Balmer series in the hydrogen spectrum?
1.

0.5 \times 10^{7} m^{- 1}

$0.5 \times 10^{7}~\text{m}^{-1}$
2.

0.25 \times 10^{7} m^{- 1}

$0.25 \times 10^{7} ~\text{m}^{-1}$
3.

2.5 \times 10^{7} m^{- 1}

$2.5 \times 10^{7}~\text{m}^{-1}$
4.

0.025 \times 10^{4} m^{- 1}

$0.025 \times 10^{4} ~\text{m}^{-1}$

Subtopic: Spectral Series |

87%

From NCERT

NEET - 2016

1

2

3

4

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Q5:

When an

α -

$\alpha\text-$ particle of mass

m

$m$ moving with velocity

v

$v$ bombards on a heavy nucleus of charge

Z e

$Ze$ , its distance of closest approach from the nucleus depends on

m

$m$ as:
1.

\frac{1}{\sqrt{m}}

$\frac{1}{\sqrt{m}}$
2.

\frac{1}{m^{2}}

$\frac{1}{m^{2}}$
3.

m

$m$
4.

\frac{1}{m}

$\frac{1}{m}$

Subtopic: Various Atomic Models |

75%

From NCERT

NEET - 2016

1

2

3

4

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