Atoms MCQ Questions for Class 12 Physics Chapter 12 with Answers

Find here the NCERT chapter-wise Multiple Choice Questions from Class 12 Physics book Chapter 12 Atoms with Answers Pdf free download. This may assist you to understand and check your knowledge about the chapters. Students also can take a free test of the Multiple Choice Questions of Atoms. Each question has four options followed by the right answer. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE.


NCERT MCQ Chapters for Class 12 Physics

Q1. In the Geiger-Marsden scattering experiment, is case of head-on collision the impact parameter should be

(i) maximum
(ii) minimum
(iii) infinite
(iv) zero

(i) maximum


Q2. Isobars have the same:

(i) A
(ii) Z
(iii) N
(iv) All the above

(i) A


Q3. The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is

(i) 1 : 1
(ii) 1 : -1
(iii) 2 : -1
(iv) 1 : -2

(ii) 1 : -1


Q4. According to the Rutherford’s atomic model, the electrons inside the atom are

(i) stationary
(ii) not stationary
(iii) centralized
(iv) None of these

(iv) None of these


Q5. What is the valence electron in alkali metal?

(i) f-electron
(ii) p-electron
(iii) s-electron
(iv) d-electron

(iii) s-electron


Q6. As the quantum number increases, the difference of energy between consecutive energy levels

(i) remain the same
(ii) increases
(iii) decreases
(iv) sometimes increases and sometimes decreases.

(iii) decreases


Q7. In the Geiger-Marsden scattering experiment the number of scattered particles detected are maximum and minimum at the scattering angles respectively at

(i) 0° and 180°
(ii) 180° and 0°
(iii) 90° and 180°
(iv) 45° and 90°

(i) 0° and 180°


Q8. The mass of a neutron is:

(i) 1.00866 u
(ii) 1.0866 u
(iii) 1.866 u
(iv) 0.1866 u

(i) 1.00866 u


Q9. The ground state energy of hydrogen atom is -13.6 eV. The kinetic and potential energies of the electron in this state are

(i) -13.6 eV, 27.2 eV
(ii) 13.6 eV,-13.6 eV
(iii) 13.6 eV,-27.2 eV
(iv) 27.2 eV,-27.2 eV

(iii) 13.6 eV,-27.2 eV


Q10. Which of the following statements is correct in case of Thomson’s atomic model?

(i) It explains the phenomenon of thermionic emission, photoelectric emission and ionisation.
(ii) It could not explain emission of line spectra by elements.
(iii) It could not explain scattering of ????-particles
(iv) All of the above

(iii) It could not explain scattering of ????-particles


Q11. Which of the following did Bohr use to explain his theory?

(i) Conservation of linear momentum
(ii) The quantization of angular momentum
(iii) Conservation of quantum frequency
(iv) Conservation of mass

(ii) The quantization of angular momentum


Q12. Rutherford’s atomic model was unstable because

(i) nuclei will break down
(ii) electrons do not remain in orbit
(iii) orbiting electrons radiate energy
(iv) electrons are repelled by the nucleus

(ii) electrons do not remain in orbit


Q13. In Geiger-Marsden scattering experiment, the trajectory traced by an aparticle depends on

(i) number of collision
(ii) number of scattered a-particles
(iii) impact parameter
(iv) none of these

(iii) impact parameter


Q14. Who explained the splitting of special lines in magnetic field?

(i) Zeeman
(ii) Bohr
(iii) Summerfield
(iv) Einstein

(i) Zeeman


Q15. The simple Bohr model cannot be directly applied to calculate the energy levels of an atom with many electrons. This is because

(i) of the electrons not being subject to a central force.
(ii) of the electrons colliding with each other
(iii) of screening effects
(iv) the force between the nucleus and an electron will no longer be given by Coulomb’s law.

(i) of the electrons not being subject to a central force.


Q16. In Bohr model of hydrogen atom, let P.E. represents potential energy and T.E. represents the total energy. In going to a higher level.

(i) P. E. decreases, T.E. increases
(ii) P. E. increases, T.E. decreases
(iii) P. E. decreases, T.E. decreases
(iv) P. E. increases, T.E. increases

(iv) P. E. increases, T.E. increases


Q17. Balmer series lies in which spectrum?

(i) visible
(ii) ultraviolet
(iii) infrared
(iv) partially visible, partially infrared

(ii) ultraviolet


Q18. In which of the following system, will the radius of the first orbit (n=1) be minimum?

(i) Doubly ionized lithium
(ii) Singly ionized helium
(iii) Deuterium atom
(iv) Hydrogen atom

(i) Doubly ionized lithium


Q19. In a hydrogen atom, which of the following electronic transitions would involve the maximum energy change

(i) n = 2 to n = 1
(ii) n = 3 to n = 1
(iii) n = 4 to n = 2
(iv) n = 3 to n = 2

(ii) n = 3 to n = 1


Q20. The first model of atom in 1898 was proposed by

(i) Ernst Rutherford
(ii) Albert Einstein
(iii) J.J. Thomson
(iv) Niels Bohr

(iii) J.J. Thomson


Q21. An atom stays in an excited state for about:

(i) 10 micro seconds
(ii) 10 milli seconds
(iii) 10 nano seconds
(iv) 10 seconds

(iii) 10 nano seconds


Q22. According to classical theory, the circular path of an electron in Rutherford atom model is

(i) spiral
(ii) circular
(iii) parabolic
(iv) straight line

(i) spiral


Q23. Which source is associated with a line emission spectrum?

(i) Electric fire
(ii) Neon street sign
(iii) Red traffic light
(iv) Sun

(ii) Neon street sign


Q24. Electrons in the atom are held to the nucleus by

(i) coulomb’s force
(ii) nuclear force
(iii) vander waal’s force
(iv) gravitational force

(i) coulomb’s force


Q25. The first spectral series was discovered by

(i) Balmer
(ii) Lyman
(iii) Paschen
(iv) Pfund

(i) Balmer


Q26. The concept of electron spin was introduced by:

(i) Becquerel
(ii) Goudsmit
(iii) Millikan
(iv) Uhlenbeek and Goudsmit

(iv) Uhlenbeek and Goudsmit


Q27.In Rutherford’s α -particle scattering experiment, what will be correct angle for α scattering for an impact parameter b = 0 ?

(i) 90º
(ii) 270º
(iii) 0º
(iv) 180º

(iv) 180º


Q28. What is the ratio of minimum to maximum wavelength in the Balmer series?

(i) 5:9
(ii) 5:36
(iii) 1:4
(iv) 3:4

(i) 5:9


Q29. Rutherford’s atomic model was unstable because

(i) nuclei will break down
(ii) electrons do not remain in orbit
(iii) orbiting electrons radiate energy
(iv) electrons are repelled by the nucleus

(ii) electrons do not remain in orbit


Q30. The principle that a quantum orbital cannot be occupied by more than two electrons was given by:

(i) Pauli
(ii) Millikan
(iii) Hund
(iv) None of these

(i) Pauli


Q31. The electrons of Rutherford’s model would be expected to lose energy because, they

(i) move randomly
(ii) jump on nucleus
(iii) radiate electromagnetic waves
(iv) escape from the atom

(iii) radiate electromagnetic waves


Q32. The energy of characteristic X-ray is a consequence of which of the following?

(i) The energy of the projectile electron
(ii) The thermal energy of the target
(iii) Transition in target atoms
(iv) Temperature

(iii) Transition in target atoms


Q33. Which of the following parameters is the same for all hydrogen-like atoms and ions in their ground states?

(i) Radius of the orbit
(ii) Speed of the electron
(iii) Energy of the atom
(iv) Orbital angular momentum of the electron

(iv) Orbital angular momentum of the electron


Q34. For ionization of excited Hydrogen atom, the, required energy is:

(i) a little less than 13.6
(ii) equal to 13.6
(iii) more than 13.6
(iv) 3.4 or less

(iv) 3.4 or less


Q35. The angular speed of the electron in the nth orbit of Bohr hydrogen atom is

(i) directly proportional to n
(ii) inversely proportional to n
(iii) inversely proportional to n2
(iv) inversely proportional to n3

(iv) inversely proportional to n3


Q36. Which of the following can be chosen to analogously represent the behavior of a particle?

(i) Metal rod
(ii) String
(iii) Elastic rubber
(iv) Glass rod

(ii) String


Q37. The angular momentum of the electron in hydrogen atom in the ground state is

(i) 2h
(ii) h/2
(iii) h/2π
(iv) h/4π

(iii) h/2π


Q38. Artificial radioactivity was discovered by:

(i) Joliot
(ii) Becquerel
(iii) Pauli
(iv) None of these

(i) Joliot


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