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# CUET Physics Sample Papers Atoms and Nuclei AMBIPi

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 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

Option A: 60

For n = 1, maximum number of states = 2n2 = 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 : n2

Option D: n2

Bohr radius r = ε0 n2 h2 / πZme

n2

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

Option D: Di-ionized lithium

1/ λ = RZ2 (1/ 12 – 1/22

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

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

Option B: 10–10

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

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

Option C: 0.136 eV

Energy required = 13.6 / n2 = 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 : e2/r2

Option B : e2.2r

Option C : e2/r

Option D : e2/2r2

Option B: e2.2r

Potential energy of electron in nth orbit of radius r in H-atom

U = e2/r (in CGS)   K.E = 1/2 | P.E | ⇒ K = e2/ 2r

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

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 / n2 ⇒ E2 / E3 = (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 : Z2n2

Option B : Z2/ N2

Option C : Z2/n

Option D : n2/Z

Option D: n2/Z

r = ε0n2h2 / πZ me2

r n2 / 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

Option B: 2.25

r n2 ⇒ 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

Option C: -1/2

K.E = kZe2/ 2r and P.E = -kZe2/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

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

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

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

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

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

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

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