Bihar Board Class 12 Physics Chapter 12 Atoms MCQs In English

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Class 12 Physics Chapter 12 Atoms MCQs In English

1. The first model of atom in 1898 was proposed by

(A) Ernst Rutherford
(B) Albert Einstein
(C) J.J. Thomson
(D) Niels Bohr

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2. Which of the following series of hydrogen spectrum is in visible range ?

(A) Lyman series
(B) Balmer se
(C) Paaschen series
(D) Brackett series

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(B) Balmer se

3. Electron-volt (eV) is the measure of:

(A) charge
(B) potential difference
(C) current
(D) energy

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(D) energy

4. Who explained the splitting of special lines in magnetic field ?

(A) Zeeman
(B) Bohr
(C) Summerfield
(D) Einstein

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(A) Zeeman

5. The specific charge of electron is :

(A) 1.8 x 10¹¹ c/kg
(B) 1.8 x 10^-19 c/kg
(C) 1.9 x 10^-19 c/kg
(D) None of these

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(A) 1.8 x 10¹¹ c/kg

6. The number of neutrons in an atom of ₉₀Th²³⁰ is

(A) 90
(B) 140
(C) 230
(D) 320

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(B) 140

7. The Bohr model of atoms

(A) assumes that the angular momentum of electrons 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

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(A) assumes that the angular momentum of electrons is quantized

8. The mass of a neutron is

(A) 1.00866 u
(B) 1.0866 u
(C) 1.866 u
(D) 0.1866 u

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(A) 1.00866 u

9. The mass of proton is about

(A) 9.11 x 10-31 kg
(B) 9.11 x 10-30 kg .
(C) 1.66 x 10-27 kg
(D) 166 x 10-27 kg

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10. Chadwick was awarded the Nobel Prize in Physics in 1935 for his discovery of

(A) electron
(B) proton
(C) neutron
(D) None of these

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11. Full wave rectifier uses

(A) two diodes
(B) three diodes
(C) four diodes
(D) five diodes

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(A) two diodes

12. The angular speed of the electron in the nth orbit of Bohr hydrogen atom is

(A) directly proportional to n
(B) inversely proportional to n
(C) inversely proportional to n2
(D) inversely proportional to n3

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(D) inversely proportional to n3

13. When hydrogen atom is in its first excited level, it’s radius is

(A) four times, it ground state radius
(B) twice times, it ground state radius
(C) same times, it ground state radius
(D) half times, it ground state radius.

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(A) four times, it ground state radius

14. Which of the following series in the spectrum of hydrogen atom lies in the visible region of the electromagnetic spectrum?

(A) Paschen series
(B) Balmer series
(C) Lyman series
(D) Brackett series

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(B) Balmer series

15. According to classical theory, the circular path of an electron in Rutherford atom model is

(A) spiral
(B) circular
(C) parabolic
(D) straight line

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(A) spiral

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Bihar Board physics mcq pdf free download | mcq questions In English And Hindi Medium

Pattern Based	Bihar Board, Patna
Class	12^th
Stream	Science (I.Sc)
Subject	Physics
Type Of Question	Objective Question \|\| 01 Marks
Script	Hindi And English Meadium
Published On	Bihari Academy