MCQ Questions for Class 12 Physics Chapter 12 Atoms with Answers

Atoms Class 12 Physics MCQs Questions with Answers

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

Class 12 Physics Chapter 12 Quiz

Class 12 Physics Chapter 12 MCQ Online Test

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

Atoms Class 12 Physics MCQ online test

Q1.	An atom stays in an excited state for about:
	A.10 micro seconds
	B.10 milli seconds
	C.10 nano seconds
	D.10 seconds

Ans: 10 nano seconds

Q2.	The energy equivalent to one atomic mass unit is :
	A.1.6 × 10^-19 J
	B.6.02 × 10²³ J
	C.9.31 MeV
	D.931 MeV

Ans: 931 MeV

Q3.	Who explained the splitting of special lines in magnetic field?
	A.Zeeman
	B.Bohr
	C.Summerfield
	D.Einstein

Ans: Zeeman

Q4.	The mass of a neutron is:
	A.1.00866 u
	B.1.0866 u
	C.1.866 u
	D.0.1866 u

Ans: 1.00866 u

Q5.	Isobars have the same:
	A.A
	B.Z
	C.N
	D.All the above

Ans: A

Q6.	Isotones have the same:
	A.A
	B.Z
	C.N
	D.All the above

Ans: N

Q7.	Half-life of a substance depends on:
	A.pressure
	B.temperature
	C.density
	D.None of these

Ans: None of these

Q8.	The concept of electron spin was introduced by:
	A.Becquerel
	B.Goudsmit
	C.Millikan
	D.Uhlenbeek and Goudsmit

Ans: Uhlenbeek and Goudsmit

Q9.	The principle that a quantum orbital cannot be occupied by more than two electrons was given by:
	A.Pauli
	B.Millikan
	C.Hund
	D.None of these

Ans: Pauli

Q10.	For ionization of excited Hydrogen atom, the, required energy is:
	A.a little less than 13.6
	B.equal to 13.6
	C.more than 13.6
	D.3.4 or less

Ans: 3.4 or less

Q11.	According to Bohr’s theory of hydrogen atom, the radius r of stationary orbit are related to principal quantum number n as:
	A.r_g ∝ \(\frac{1}{n^2}\)
	B.r_g ∝ \(\frac{1}{n}\)
	C.r_g ∝ n
	D.r_g ∝ n²

Ans: r_g ∝ n²

Q12.	F_g and F_e represents the gravitational and electrostatic force respectively between two electrons situated at some distance the ratio \(\frac{F_g}{F_e}\) is if the order of:
	A.9.8
	B.10⁹
	C.10⁴²
	D.10^-42

Ans: 10^-42

Q13.	Artificial radioactivity was discovered by:
	A.Joliot
	B.Becquerel
	C.Pauli
	D.None of these

Ans: Joliot

Q14.	P-decay produces:
	A.isobars
	B.isotopes
	C.isotones
	D.All the above

Ans: isobars

Q15.	Natural radioactivity was discovered by:
	A.Joliot
	B.Becquerel
	C.Pauli
	D.None of these

Ans: Becquerel

Q16.	Transmutation of nuclei was discovered by:
	A.Rutherford
	B.Becquerel
	C.Pauli
	D.None of these

Ans: Rutherford

Q17.	The energy equivalent to mass defect is called :
	A.binding energy
	B.internal energy
	C.external energy
	D.enthalpy

Ans: binding energy

Q18.	The total energy that will be released if a nucleus is built from its constituents is called the:
	A.binding energy of the nucleus
	B.binding energy of the solid
	C.binding energy of the atom
	D.None of these