B.Sc. Third year (UG degree course) Semester Fifth, Physical chemistry paper-XIII
Chapter - Spectroscopy,
Multiple choice Questions
1.The internal energy of a molecule is its
a) rotational
energy
b) vibrational
energy
c) translational
energy
d) all
of these
Answer. (d)
2.The electronic spectra are caused by
a) the
absorption of light
b) the
emission of light
c) the
absorption of high energy photons
d) none
of these
Answer. (c)
3.The rotational spectra involve
a) a
very high energy changes
b) small
energy changes
c) no
energy change
d) none
of these
Answer. (b)
4.A molecule can be excited to only the
next higher rotational level by
a) absorption
of energy
b) release
of energy
c) the
electric current
d) applying
magnetic field
Answer. (a)
5. The spectra caused in the infrared
region by the transition in vibrational levels in different modes of vibrations
are called
a) rotational
spectra
b) electronic
spectra
c) vibrational
spectra
d) none
of these
Answer. (c)
6. NMR spectroscopy is useful for
determining the type and number of _______ atoms in organic molecules.
a) hydrogen
b) carbon
c) halogen
d) hetero
atoms
Answer. (a)
7. The wave numbers are expressed in
a) sec–1
b) cm
sec–1
c) cm–1
d) cm2
sec–1
Answer. (c)
8.Which of the following is not true about
electromagnetic radiation?
a) frequency
is directly proportional to wavelength
b) frequency
is directly proportional to wavenumber
c) energy
is inversely proportional to wavelength
d) energy
is inversely proportional to wavenumber
Answer. (a)
9.What type of radiation is used in nuclear
magnetic resonance (NMR) spectroscopy?
a) ultraviolet
light
b) microwaves
c) radio
waves
d) infrared
radiation
Answer. (c)
10.Radiation source for UV radiation is
a) Tungsten
lamp
b) Sodium
lamp
c) Hydrogen
lamp
d) Nearnst
glower
Answer. (c)
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