MCQ Questions for Class 12 Physics Chapter 13 Nuclei Part-1 with Answers

Nuclei Part-1 Class 12 Physics MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Physics Chapter 13 Nuclei Part-1 with Answers Pdf free download. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. We have Provided Nuclei Part-1 Class 12 Physics MCQs Questions with Answers to help students understand the concept very well.

Class 12 Physics Chapter 13 Quiz

Class 12 Physics Chapter 13 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Physics Chapter 13 Nuclei Part-1 to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Nuclei Part-1 Class 12 Physics MCQ online test

Q1.	How many electrons are contained in \(_{92}^{238}\)U nucleus?
	A.92
	B.146
	C.238
	D.0

Ans: 0

Q2.	Chadwick was awarded the Nobel prize in Physics in 1935 for his discovery of:
	A.electron
	B.proton
	C.neutron
	D.None of these

Ans: neutron

Q3.	The density of a nucleus is of the order of:
	A.10¹⁵ kg m^-3
	B.10¹⁸ kg m^-3
	C.10¹⁷ kg m^-3
	D.10¹⁶ kg m^-3

Ans: 10¹⁷ kg m^-3

Q4.	In the given reaction: \(_{Z}^{A}\)X → \(_{Z+1}^{A}\) Y → \(_{Z-1}^{A-4}\) K → \(_{Z-1}^{A-4}\) K radioactive radiations are emitted in the sequence
	A.α, β, γ
	B.β, α, γ
	C.γ, α, β
	D.β, γ, α

Ans: β, α, γ

Q5.	When the mass of a sample of a radioactive substance decreases, the mean life of the sample:
	A.increases
	B.decreases
	C.remain unchanged
	D.first decreases then increases

Ans: remain unchanged

Q6.	Alpha particle emitted from a radioactive material are:
	A.Helium nuclei
	B.Hydrogen nuclei
	C.Lithium nuclei
	D.None of the above

Ans: Helium nuclei

Q7.	The half life of a radioactive decay is n times its mean life, n is equal to:
	A.0.6930
	B.0.0693
	C.\(\frac{1}{0.6930}\)
	D.0.3070

Ans: 0.6930

Q8.	Rutherford is the unit of:
	A.radioactivity
	B.energy
	C.photoelectric current
	D.magnetic field

Ans: radioactivity

Q9.	According to Yukawa’s theory of nuclear forces, the origin of nuclear force between nucleons is due to the exchange of
	A.mesons
	B.photons
	C.electrons
	D.positrons

Ans: photons

Q10.	An electron and a positron each having a mass equivalent to 0.53 MeV annihilate each other and produce a photon. The minimum energy of the photon is.
	A.0.53 MeV
	B.1.06 MeV
	C.2.12 MeV
	D.zero

Ans: 1.06 MeV

Q11.	The wavelength of y-rays is of the order of:
	A.10^-8 m
	B.10^-5 m
	C.10^-11 m
	D.10^-22 m

Ans: 10^-11 m

Q12.	Radius of 1st Bohr orbit is a₀ (= 0.529 Å) What is the radius of 2nd Bohr orbit?
	A.10^-8
	B.2a₀
	C.4a₀
	D.2√2a₀

Ans: 4a₀

Q13.	The ground state energy of Hydrogen atom is -13.6 eV. What is the potential energy of electron in this state?
	A.0 eV
	B.-13.6 eV
	C.2 eV
	D.-27.2 eV

Ans: -27.2 eV

Q14.	Which of the following atoms has the lowest ionization potential?
	A.\(_{8}^{8}\)O
	B.\(_{7}^{14}\)N
	C.\(_{55}^{133}\)Cs
	D.\(_{18}^{40}\)Ar

Ans: \(_{55}^{133}\)Cs

Q15.	The Bohr model of atom:
	A.assumes that the angular momentum of electron is quantized
	B.uses Einstein’s photoelectric equation
	C.predicts continuous emission spectra for atoms
	D.predicts the same emission spectra for all types of atoms

Ans: assumes that the angular momentum of electron is quantized

Q16.	Nuclear force is:
	A.strong, short range and charge independent force
	B.charge independent, attractive and long range force
	C.strong, charge dependent and short range attractive force
	D.long range, change dependent and attractive force

Ans: strong, short range and charge independent force

Q17.	If radio active nuclei emits β-particle, then mass-number:
	A.increased by 1 unit
	B.decreases by 1 unit
	C.increases by 2 unit
	D.decreases by 2 unit

Ans: increased by 1 unit

Q18.	An alpha particle is emitted from \(_{88}\)Ra\(^{226}\), then the product nuclei has:
	A.Z = 84, A = 224
	B.Z = 86, A = 224
	C.Z = 86, A = 222
	D.Z = 82, A = 222

Ans: Z = 86, A = 222

Q19.	X-ray was discovered by :
	A.Becqueral
	B.Marie curie
	C.Roengton
	D.Vanlaw

Ans: Roengton

Q20.	Fusion takes place at high temperature because:
	A.Atom are ionised at high temperature
	B.Molecules break up at high temperature
	C.Nuclei break up at high temp.
	D.Kinetic energy is high enough to overcome repulsion between nuclei