B.Sc. Third year (UG degree course) Semester Fifth, Physical chemistry paper-XIII
Chapter – Elementary quantum
mechanics
1. Electromagnetic
radiations with minimum wavelength is
a) ultraviolet
b) X-rays
c) infrared
d) radiowaves
Answer. (b)
2. Which of the following statements is false?
a) electrons travel around
the nucleus in specific permitted circular orbits
b) an electron does not
lose energy as long as it moves in its specified orbits
c) an electron can jump
from one energy level to another by absorbing or losing energy
d) the angular momentum of
an electron is not quantised
Answer. (d)
3. The idea of stationary orbits was first given by
a) Rutherford
b) JJ Thomson
c) Niels Bohr
d) Max Planck
Answer. (c)
4. The maximum number of electrons that can be accommodated
in an orbit is
a) 2n
b) n2
c) 2n2
d) 2n + 1
Answer. (c)
5. The ground state of an atom corresponds to a state of
a) maximum energy
b) minimum energy
c) zero energy
d) negative energy
Answer. (b)
6. Balmer series in the spectrum of hydrogen atom lies in
a) ultraviolet region
b) visible region
c) infrared region
d) none of these
Answer. (b)
7. According to de Broglie’s equation, the momentum of a
particle in motion is _______ proportional to wavelength.
a) inversely
b) directly
c) is not
d) none of these
Answer. (a)
8. In Schrödinger’s wave equation, the symbol ψ represents
the
a) wavelength of the
spherical wave
b) amplitude of the
spherical wave
c) frequency of the
spherical wave
d) none of these
Answer. (b)
9. The energy of electron in an atomic orbital is always
_______.
a) different
b) zero
c) infinite
d) same
Answer. (d)
10. An orbital is the space around the nucleus where the
probability of finding electron is
a) always zero
b) maximum
c) minimum
d) always infinite
Answer. (b)
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