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 = 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
Show/Hide Answer Key
Option D: n2
Bohr radius r = ε0 n2 h2 / πZme2
r ∝ 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
Show/Hide Answer Key
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
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 / 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
Show/Hide Answer Key
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
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 / 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
Show/Hide Answer Key
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
Show/Hide Answer Key
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
Show/Hide Answer Key
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
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
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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.
