B.Sc. Third year (UG degree course) Semester Fifth, Physical chemistry paper-XIII
Chapter – Elementary quantum
mechanics
1. Which of the following
is not correct for electromagnetic waves?
a) the wavelength is the
distance between two successive crests
b) the frequency is the
number of waves which pass a given point in one second
c) the velocity of a wave
is the distance covered by the particular wave in one second
d) all electromagnetic
waves have equal wavelengths
Answer. (d)
2. In the spectrum of
hydrogen atom, the series which falls in ultraviolet region is
a) Lyman series
b) Balmer series
c) Paschen series
d) Brackett series
Answer. (a)
3. The Balmer series in
the spectrum of hydrogen atom falls in
a) ultraviolet region
b) visible region
c) infrared region
d) none of these
Answer. (b)
4. When a beam of light
of sufficiently high frequency is allowed to strike a metal surface in vacuum, electrons
are ejected from the metal surface. This phenomenon is called
a) Black body radiation
b) Photoelectric effect
c) Zeeman effect
d) Stark effect
Answer. (b)
5. In photoelectric
effect, the kinetic energy of the photoelectrons increases linearly with the
a) wavelength of the
incident light
b) frequency of the
incident light
c) velocity of the incident
light
d) none of these
Answer. (b)
6. Lyman series is
obtained when the electrons from higher energy levels return to
a) 1st orbit
b) 2nd orbit
c) 3rd orbit
d) 4th orbit
Answer. (a)
7. A line in Pfund
series is obtained when an electron from higher energy levels returns to
a) 1st orbit
b) 3rd orbit
c) 5th orbit
d) 6th orbit
Answer. (c)
8. The energy of an
electron in Bohr’s atom _______ as we move away from the nucleus
a) remains the same
b) decreases
c) increases
d) sometimes increases,
sometimes decreases
Answer. (c)
9. When an electron
drops from a higher energy level to a lower energy level, then
a) the energy is absorbed
b) the energy is released
c) the nuclear charge
increases
d) the nuclear charge
decreases
Answer. (b)
10. If r is the radius
of first orbit, the radius of nth orbit of hydrogen atom will be
a) n2 r
b) n r
c) n/r
d) r/n
Answer. (a)
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