Elementary quantum mechanics MCQ-B.Sc. Third year (UG degree course) Semester Fifth, Physical chemistry paper-XIII (Part 3)

 B.Sc. Third year (UG degree course) Semester Fifth, Physical chemistry paper-XIII

Chapter – Elementary quantum mechanics

Multiple choice Questions

1. The Principal quantum number ‘n’ represents
a)  average size of the electron cloud
b) average energy of the electron
c)  average distance of the electron from the nucleus
d) all of the above
Answer. (d)

2. The Principal quantum number is related to the
a)  orbital angular momentum
b) size and shape of the orbital
c)  orientation of the orbital
d) average size of the orbital
Answer. (d)

3. The quantum number that defines the shape of the orbital occupied by the electron is
a)  principal quantum number
b) azimuthal quantum number
c)  magnetic quantum number
d) spin quantum number
Answer. (b)

4. “It is impossible to determine simultaneously the position and velocity with accuracy of a small particle like electron”. This statement is
a)  Heisenberg’s uncertainty principle
b) de Broglie principle
c)  Planck’s law
d) Aufbau’s principle
Answer. (a)

5. The angular momentum of the electron is defined by the quantum number that is denoted as
a)  n
b) l
c)  m
d) s
Answer. (b)

6. The total number of sublevels in each principal level is equal to
a)  spin quantum number
b) magnetic quantum number
c)  azimuthal quantum number
d) principal quantum number
Answer. (d)

7. The total values of magnetic quantum number for a given value of azimuthal quantum number is
a)  2l
b) 2l + 1
c)  2l –1
d) 2l– 2
Answer. (b)

8. “No two electrons in an atom can have same set of four identical quantum numbers”. It is the statement of
a)  Aufbau principle
b) Hund’s rule
c)  Pauli’s exclusion principle
d) none of these
Answer. (c)

9. The orbital with n = 3 and l = 2 is
a)  3s
b) 3p
c)  3d
d) 3f
Answer. (c)

10. The Phenomenon of ejection of electron from metal surface when light falls on it….
a)  Compton effect
b) Photoelectric effect
c)  Raman effect
d) None of these

Answer. (b)

More Questions Part 1 Click here  

                           Part 2 Click here

                           Part 3 Click here

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