Physics Class 12 MCQ Atoms Questions & Answer – Chapter 12

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Practice questions on Atoms Chapter 12 Physics Class 12 and score really good marks. These MCQs on Atoms Physics Class 12 are prepared keeping in mind the latest examination pattern of the board. So all the students who are going to appear in their Class 12 board exams this time, they can practice these very important MCQs on Atoms from this page.

Scroll down the post, and you will find all the important MCQs on Atoms Class 12 Physics here. You can practice these questions as many times as you want for free. So, don’t waste even a single minute and start your preparation from today only, so that till the time your boards commence, you have a good hold of the topic.

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Physics Class 12 MCQ Atoms – Chapter 12

Ques 1: Which of the following quantities has the same dimensions as those of Plank’s constant ?

• angular momentum
• torque
• energy
• momentum

angular momentum

• 13.6 eV
• -13.6 eV
• 30.4 eV
• -122.4 eV

-122.4 eV

• 1
• 1 : 2
• 2 : 3
• 4 : 9

4 : 9

Ques 4: The series of hydrogen spectrum which lies in visible region is

• Lyman series
• Balmer series
• Paschen series
• none of the above

Balmer series

Atoms Class 12 MCQs With Solutions

Ques 5: The correct relation for impact parameter, where symbols have their usual meaning is

• Ze2cotθ/2 / 4πϵ0 .E
• 2Ze2cotθ / 4πϵ0 .E
• Z2cotθ/2 / 4πϵ0 E
• 4πϵ0 E / Ze2cotθ/2

Ze2cotθ/2 / 4πϵ0 .E

Ques 6: Total energy of electron in nth stationary orbit of hydrogen atom is

• 13.6/n2 Joule
• 13.6/n2eV
• – 13.6/n2 eV
• – 13.6/n2 Joule

– 13.6/n2 eV

Ques 7: The value of Rydberg constant is

• 1.097 × 10-7 m
• 1.097 × 107 m-1
• 1.097 × 10-7 m-1
• 1.097 × 107 m

1.097 × 107 m-1

• 10 m/s
• 106 m/s
• 10-6 m/s
• 107 m/s

106 m/s

• -13.6 eV
• 13.6 eV
• -13.6 V
• 13.6 V

13.6 V

• 0.5 Å
• 1 Å
• 2 Å
• 4 Å

1 Å

Multiple Choice Questions Class 12 Physics Chapter 12 Atoms

Ques 11: When alpha particles are sent through a thin gold foil, most of them go straight through the foil, because

• Alpha particles are positively charged
• Mass of alpha particle is more than mass of electron
• Most of the part of an atom is empty space
• Alpha particles move with high velocity

Most of the part of an atom is empty space

Ques 12: The existence of positively charged nucleus was established by

• Bohr’s model of H-atom
• Positive ray analysis
• α Scattering experiment
• Thomson’s model of atom

α Scattering experiment

• ph/2π
• h/2π
• 2h/π
• nh/2π

nh/2π

• Paschen
• Lyman
• Brackett
• Balmer

Lyman

Ques 15: Kinetic energy of electron in hydrogen atom is

• e2 / 4πε0r
• e2 / 8 πε0 r
• e2 / 8πε0r
• e2 / 3 πε0 r

e2 / 8 πε0 r

• 6.2 eV
• 3.40 eV
• 10.2 eV
• -13.6 eV

10.2 eV

Important MCQs With Solutions Physics Class 12 Atoms

Ques 17: When is the angular momentum of an electron revolving in the 3rd orbiut of an atom ?

• 31.5 × 10-34 J.sec
• 315 × 10-34 J.sec
• 3.15 × 10-34 J.sec
• 315 × 10-34 J.sec

3.15 × 10-34 J.sec

• l = h/2π
• l = h / 9π
• l = nh / 2π
• l = nmp / 2π

l = nh / 2π

Ques 19: The minimum energy required to mnock an e– completely out of the atom is called as

• Kinetic Energy
• Potential Energy
• Ionization Energy
• Excitation Energy

Ionization Energy

• -3.4 eV
• 1.51 eV
• -.85 eV
• 0 eV

1.51 eV

Ques 21: The energy level diagram of an element is given : which transition corresponds to the emission of a spectral line of wave length 102.7 nm • A
• B
• C
• D

D

Ques 22: For the shortest wavelength present in the paschen series of spectiral lines 1/λ = R [1/n22 – 1/n21

• n2 = 3, n1 = ∞
• n2 = ∞, n1 = 3
• n2 = 3, n1 = 1
• n2 = ∞, n1 = 1

n2 = 3, n1 = ∞

Physics Chapter Wise MCQ Questions and Answers We hope you liked this collection of important questions of Atoms Chapter 12 Physics Class 12. These questions are really important from examination point of view. In case of queries, you may contact us via comment box.

Updated: January 3, 2022 — 10:34 am