# MCQ Questions for Class 12 Physics Chapter 12 Atoms Questions with Answers

## CBSE: NCERT Solutions for Class 12 Physics Chapter 12 Atoms MCQ’s with Answers

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### NCERT Physics MCQs for Class 12 Question Chapter 12 Atoms Answers PDF

Q1. The binding energy of a deuteron is about:
(a) 2.22 MeV
(b) 2.22 J
(c) 2.22 eV
(d) None of these

Q2. The binding energy of 4/2He is about:
(a) 28.3 eV
(b) 28.3 MeV
(c) 28.3 J
(d) 2.83 MeV

Q3. 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

Answer:(b) binding energy of the solid

Q4.The energy equivalent to mass defect is called :
(a) binding energy
(b) internal energy
(c) external energy
(d) enthalpy

Q5. Transmutation of nuclei was discovered by:
(a) Rutherford
(b) Becquerel
(c) Pauli
(d) None of these

(a) Joliot
(b) Becquerel
(c) Pauli
(d) None of these

Q7. P-decay produces:
(a) isobars
(b) isotopes
(c) isotones
(d) All the above

Q8 .Artificial radioactivity was discovered by:
(a) Joliot
(b) Becquerel
(c) Pauli
(d) None of these

Q9.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

Q10. 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

Q11.The concept of electron spin was introduced by:
(a) Becquerel
(b) Goudsmit
(c) Millikan
(d) Uhlenbeek and Goudsmit

Q12. Half-life of a substance depends on:
(a) pressure
(b) temperature
(c) density
(d) None of these

Q13.Isotones have the same:
(a) A
(b) Z
(c) N
(d) All the above

Q14. Isobars have the same:
(a) A
(b) Z
(c) N
(d) All the above

Q15.The mass of a neutron is:
(a) 1.00866 u
(b) 1.0866 u
(c) 1.866 u
(d) 0.1866 u

Q16. Who explained the splitting of special lines in magnetic field?
(a) Zeeman
(b) Bohr
(c) Summerfield
(d) Einstein

Q17. An atom stays in an excited state for about:
(a) 10 micro seconds
(b) 10 milli seconds
(c) 10 nano seconds
(d) 10 seconds

Q18. A spectral line is emitted when an electron
(a) jumps from lover orbit to higher orbit.
(b) jumps from higher orbit to lower orbit.
(c) rotates in a circular orbit.
(d) rotates in an elliptical orbit.

Answer:(b) jumps from higher orbit to lower orbit.

Q19.The ionisation potential of hydrogen is 13.6 V. The energy of the atom in n = 2 state will be
(a) -10.2 eV
(b) -6.4eV
(c) – 3.4 eV
(d) – 4.4 ev

Q20. In Rutherford’s scattering experiment with gold foil, 232 counts per minute are observed at an angle of 60°. The number of counts/min. at an angle of 120° will be
(A) 232
(b) 116
(c) 26
(d) 52

Q21. To explain fine structure of spectrum of hydrogen atom, we must consider.
(a) a finite size of nucleus.
(b) the presence of neutrons in the nucleus.
(c) spin angular momentum.
(d) orbital angular momentum.

Answer:(b) the presence of neutrons in the nucleus.

Q22. When an electron jumps from some outer orb it to the innermost orbit in the hydrogen atom, the spectral line belongs to
(a) Lyman series
(b) Balmer series
(c) Paschen series
(d) Pfund series

Q23. How does the energy difference between two consecutive energy levels vary on the quantum number n increases?
(a) does not change
(b) decrases
(c) increases
(d) may increase or decrease.

Q24. According to classical theory, Rutherford atom is
(a) stable
(b) unstable
(c) metastable
(d) semistable