Hi CUET aspirants, Welcome to **Amans Maths Blogs (AMBIPi)**. In this post, you will get CUET Physics Mock Test Atoms and Nuclei AMBIPi. This CUET Physics Mock Test is of the Physics chapter Atoms and Nuclei. Before solving these CUET Physics questions, you must read CUET Physics Notes, which helps you to revise CUET Physics Syllabus and then you must need to solve CUET Previous Years Questions Papers.

## CUET Physics Mock Test

**CUET Physics Question No: 1**

If in nature there may not be an element for which the principal quantum number n > 4, then the total possible number of elements will be

**Option A** : 60

**Option B** : 32

**Option C** : 4

**Option D** : 64

**Show/Hide Answer Key**

**Option A: 60**

For n = 1, maximum number of states = 2n^{2} = 2 and for n = 2, 3, 4, maximum number of states would be 8, 18, 32 respectively. Hence, number of possible elements = 2 + 8 + 18 + 32 = 60

**CUET Exam Physics Question No: 2**

In the Bohr’s hydrogen atom model, the radius of the stationary orbit is directly proportional to (n = principal quantum number)

**Option A** : n^{–1 }

**Option B** : n

**Option C** : n^{-2}

**Option D** : n^{2}

**Show/Hide Answer Key**

**Option D: n ^{2}**

Bohr radius r = ε_{0} n^{2} h^{2} / πZme^{2 }

r **∝** n^{2}

**CUET UG Physics Question No: 3**

In the following atoms and molecules for the transaction from n = 2 to n = 1, the spectral line of minimum wavelength will be produced by

**Option A** : Hydrogen atom

**Option B** : Deuterium atom

**Option C** : Uni-ionized helium

**Option D** : Di-ionized lithium

**Show/Hide Answer Key**

**Option D: Di-ionized lithium**

1/ λ = RZ^{2} (1/ 1^{2} – 1/2^{2})

For di-ionised lithium the value of Z is maximum.

**CUET Domain Subject Physics Question No: 4**

The Lyman series of hydrogen spectrum lies in the region

**Option A** : Infrared

**Option B** : Visible

**Option C** : Ultraviolet

**Option D** : Of X-rays

**Show/Hide Answer Key**

**Option C: Ultraviolet**

Lyman series lies in the UV region

**CUET BSc Physics Question No: 5**

The size of an atom is of the order of

**Option A** : 10^{–8} m

**Option B** : 10^{–10} m

**Option C** : 10^{–12} m

**Option D** : 10^{–14} m

**Show/Hide Answer Key**

**Option B: 10 ^{–10} m **

The size of the atom is of the order of 1 Å = 10^{–10 m}

**CUET Entrance Exam Physics Question No: 6**

Which one of the series of hydrogen spectrum is in the visible region

**Option A** : Lyman series

**Option B** : Balmer series

**Option C** : Paschen series

**Option D** : Bracket series

**Show/Hide Answer Key**

**Option B: Balmer series**

Balmer series lies in the visible region.

**CUET Exam Question No: 7**

The energy required to remove an electron in a hydrogen atom from n = 10 state is

**Option A** : 13.6 eV

**Option B** : 1.36 eV

**Option C** : 0.136 eV

**Option D** : 0.0136 eV

**Show/Hide Answer Key**

**Option C: 0.136 eV **

Energy required = 13.6 / n^{2} = 13.6 / 10.2 = 0.136 eV

**CUET Physics Practice Questions No: 8**

The kinetic energy of the electron in an orbit of radius r in hydrogen atom is (e = electronic charge)

**Option A** : e^{2}/r^{2}

**Option B** : e^{2}.2^{r}

**Option C** : e^{2}/r

**Option D** : e^{2}/2r^{2}

**Show/Hide Answer Key**

**Option B: e ^{2}.2^{r}**

Potential energy of electron in n^{th} orbit of radius r in H-atom

U = e^{2}/r (in CGS) K.E = 1/2 | P.E | ⇒ K = e^{2}/ 2^{r}

**CUET Physics Sample Paper Question No: 9**

The ratio of the energies of the hydrogen atom in its first to second excited state is

**Option A** : 1/4

**Option B** : 4/9

**Option C** : 9/4

**Option D** : 4

**Show/Hide Answer Key**

**Option C: 9/4**

First excited state i.e., second orbit (n = 2) Second excited state i.e., third orbit (n = 3)

E = 13.6 / n^{2} ⇒ E_{2} / E_{3} = (3/2)^{2} = 9/4

**CUET Physics Mock Test Question No: 10**

According to Bohr’s theory the radius of electron in an orbit described by principal quantum number n and atomic number Z is proportional

**Option A** : Z^{2}n^{2}

**Option B** : Z^{2}/ N^{2}

**Option C** : Z^{2}/n

**Option D** : n^{2}/Z

**Show/Hide Answer Key**

**Option D: n ^{2}/Z**

r = ε_{0}n^{2}h^{2} / πZ me^{2 }

r **∝** n^{2} / Z

**CUET Physics Question No: 11**

The radius of electrons second stationary orbit in Bohr’s atom is R. The radius of the third orbit will be

**Option A** : 3 R

**Option B** : 2.25 R

**Option C** : 9 R

**Option D** : R/3

**Show/Hide Answer Key**

**Option B: 2.25 **

r **∝** n^{2} ⇒ r _{(n=2)} / r _{(n = 3)} = 4/9

r _{(n=3) }= 9/4 R = 2.25 R

**CUET Exam Physics Question No: 12**

In any Bohr orbit of the hydrogen atom, the ratio of kinetic energy to potential energy of the electron is

**Option A** : ^{1/2}

**Option B** : 2

**Option C** : -1/2

**Option D** : -2

**Show/Hide Answer Key**

**Option C: -1/2**

K.E = kZe^{2}/ 2r and P.E = -kZe^{2}/r

K.E / P.E = -1/2

**CUET UG Physics Question No: 13**

The spectral series of the hydrogen spectrum that lies in the ultraviolet region is the

**Option A** : Balmer series

**Option B** : Pfund series

**Option C** : Paschen series

**Option D** : Lyman series

**Show/Hide Answer Key**

**Option D: Lyman series**

Lyman series lies in the UV region

**CUET Domain Subject Physics Question No: 14**

In Bohr model of the hydrogen atom, the lowest orbit corresponds to

**Option A** : Infinite energy

**Option B** : The maximum energy

**Option C** : The minimum energy

**Option D** : Zero energy

**Show/Hide Answer Key**

**Option C: The minimum energy**

In hydrogen atom, the lowest orbit (n = 1) correspond to minimum energy (–13.6 eV).

**CUET BSc Physics Question No: 15**

If an electron jumps from 1st orbital to 3rd orbital then it will

**Option A** : Absorb energy

**Option B** : Release energy

**Option C** : No gain of energy

**Option D** : None of these

**Show/Hide Answer Key**

**Option A: Absorb energy**

When an electron jumps from the orbit of lower energy (n = 1) to the orbit of higher energy (n = 3), energy is absorbed.

**CUET Entrance Exam Physics Question No: 16**

To explain his theory, Bohr used

**Option A** : Conservation of linear momentum

**Option B** : Conservation of angular momentum

**Option C** : Conservation of quantum frequency

**Option D** : Conservation of energy

**Show/Hide Answer Key**

**Option B: Conservation of angular momentum**

Bohr postulated that the angular momentum of the electron is conserved.

**CUET Exam Question No: 17**

Number of spectral lines in hydrogen atom is

**Option A** : 3

**Option B** : 6

**Option C** : 15

**Option D** : Infinite

**Show/Hide Answer Key**

**Option D: Infinite**

Infinitely large transitions are possible (in principle) for the hydrogen atom.

**CUET Physics Practice Questions No: 18**

Minimum excitation potential of Bohr’s first orbit in hydrogen atom is

**Option A** : 13.6 V

**Option B** : 3.4 V

**Option C** : 10.2

**Option D** : 3.6 V

**Show/Hide Answer Key**

**Option C: 10.2**

Excitation potential = Excitation energy / e

Minimum excitation energy corresponds to excitation from n = 1 to n = 2

Minimum excitation energy in hydrogen atom = –3.4 – (–13.6) = + 10.2eV

**CUET Physics Sample Paper Question No: 19**

According to the Rutherford’s atomic model, the electrons inside the atom are

**Option A** : Stationary

**Option B** : Not stationary

**Option C** : Centralized

**Option D** : Straight line

**Show/Hide Answer Key**

**Option B: Not stationary**

According to the Rutherford’s atomic model, the electron, inside the atoms are not stationary.

**CUET Physics Mock Test Question No: 20**

According to classical theory, the circular path of an electron in Rutherford atom is

**Option A** : Spiral

**Option B** : Circular

**Option C** : Parabolic

**Option D** : Straight line

**Show/Hide Answer Key**

**Option A: Spiral**

According to classical theory, the circular path of an electron in Rutherford atom is spiral.