Bihar Board - Class 12 Physics - Chapter 12: Atoms Multiple Choice Questions (MCQs)
For Class 12 Bihar Board, the chapter Atoms in Physics explain the structure of atoms, discussing models like Rutherford's and Bohr's, along with the concept of atomic spectra and energy levels. You can also find the multiple-choice questions that help in mastering these topics and preparing effectively for exams on Vidyakul.
Multiple Choice Question
1. The first model of atom was proposed by J J Thomson which is called as
(A) Atomic model
(B) Plum pudding model
(C) Nuclear model
(D) Both A and B
Answer: (B) plum pudding model
2. Rutherford’s planetary model of atom is also called as
(A) Atomic model
(B) Plum pudding model
(C) Nuclear model of the atom
(D) None
Answer: (C) nuclear model of the atom
3. According to Rutherford’s nuclear model of atom, the entire positive charge and most of the mass of the atom is concentrated in a small volume called as
(A) Centre of atom
(B) Nucleus
(C) Electrons
(D) Nucleons
Answer: (B) nucleus
4. The dark lines correspond to those wavelengths which were found in the emission line spectrum of the gas, which is called as
(A) Emission spectrum of the material of the gas
(B) Absorption spectrum of the material of the gas
(C) Both a and b
(D) None
Answer: (B) absorption spectrum of the material of the gas
5. The Balmer formula is given by
(A) 1/wavelength = R(1/22 + 1/n2)
(B) Wavelength = R(1/22 – 1/n2)
(C) 1/wavelength = R(1/22 – 1/n2)
(D) None
Answer: (C) 1/wavelength = R(1/22 – 1/n2)
6. The value of Rydberg constant R is given as
(A) 1.09710-7 m-1
(B) 1.097107m-1
(C) 1.09710-8 m-1
(D) 1.0971017 m-1
Answer: (B) 1.097107 m-1
7. For Lyman series n=
(A) n= 1,2,3,..
(B) n= 2,3,4..
(C) n= 4,5,6..
(D) None
Answer: (B) n = 2,3,4…
8. For Paschen series n=
(A) n= 2,3,4…
(B) n= 4,5,6…
(C) n= 5,6,7…
(D) None
Answer: (B) n= 4,5,6..
9. For Bracket series n=
(A) n= 4,5,6…
(B) n= 6,7,8…
(C) n= 5,6,7…
(D) None
Answer: (C) n= 5,6,7…
10. For Pfund series n=
(A) n = 6,7,8…
(B) n= 5,6,7…
(C) n= 7,8,9…
(D) None
Answer: (A) n= 6,7,8,…
11. Lyman series is in the
(A) Visible region
(B) Infrared region
(C) Ultraviolet region
(D) None
Answer: (C) ultraviolet region
12. The Paschen, Bracket and Pfund series is in the
(A) Visible region
(B) Ultraviolet region
(C) Infrared region
(D) None
Answer: (C) infrared region
13. An electron in an atom could revolve in a certain stable orbits without the emission of radiant energy, this is
(A) Bohr’s second postulate
(B) Bohr’s first postulate
(C) Rutherford’s first postulate
(D) Rutherford’s second postulate
Answer: (B) Bohr’s first postulat
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