Multiple Choice Questions on Spectroscopy
1- Zeeman effect is the splitting of spectral line in the presence of _______
(A) Magnetic field
(B) Inert environment
(C) Vacuum
(D) Electric field
2- Which one of the following types of spectroscopy is a light-scattering technique ?
(A) NMR
(B) IR
(C) Raman
(D) UV
3- Raman effect is produced by which one of the following process of spectroscopy ?
(A) Atomic absorption
(B) Atomic scattering of radiation
(C) Molecular vibration
(D) Atomic emission
4- IR spectroscopy is useful for determining certain aspects of the structure of organic compounds because _______
(A) Most organic functional groups absorb in characteristic region of IR spectrum
(B) IR peak intensities are related to molecular mass
(C) All molecular bonds absorb IR radiation
(D) Each element absorbs at a characteristic wave length
5- The difference in wave length between incident and scattered visible radiation, corresponds to wave length is observed in _______
(A) Visible region
(B) Infrared region
(C) Microwave region
(D) Ultraviolet region
6- The source of radiation used in Raman spectroscopy is _______
(A) Tungsten lamp
(B) Hollow cathode lamp
(C) Deutrium lamp
(D) Junable mercury–neon laser lamp
7- The plasma in ICP–AES consists of :
(A) Positive ions only
(B) Electrons only
(C) Neutral molecules only
(D) Electrons, positive ions and neutral molecules
8- Nebuliser is being used in plasma spectroscopy to _______
(A) Spray liquid in the chamber
(B) Detect the emitted radiation
(C) Produce plasma
(D) Convert liquid to aerosol and generate plasma
9- The analysis of fluoride in presence of anions in water sample is done with
(A) Nephelometer
(B) Ion analyser
(C) Fluorimeter
(D) Turbidimeter
10- Following are the characteristics of mass spectrometry
I. Analyte molecules are converted to gaseous ions
II. The ions are separated according to their mass to charge ratio
III. The addition of compound identification mass spectra can be utilized to determine precise isotopic masses and isotopic ratios.
The correct answer will be.
(A) II only
(B) I and III
(C) II and III
(D) I, II and III
11- Which one of the following element is used in cryoscopy to obtain very low temperature ?
(A) C
(B) Li
(C) B
(D) He
12- The compartment which contains hollow cathode lamp is filled with _______ in atomic absorption spectroscopy.
(A) Ar gas
(B) HCl gas
(C) HNO3 vapours
(D) Cl2 gas
13- Atomic emission spectroscopy is
(A) The measurement of intensity of emitted light at a particular wavelength from the atoms that are exited thermally.
(B) The measurement of absorbance of emitted light at a particular wavelength from the atoms that are exited thermally.
(C) The measurement of intensity of emitted light at a particular wavelength from the atoms that are excited by monochromatic light.
(D) The measurement of intensity of absorbed light at a particular wavelength from the atoms that are exited thermally.
14- In hollow cathode lamp of atomic absorption spectroscopy, the cathode is made up of / coated with _______
(A) Graphene
(B) multiwalled carbon nanotube
(C) carbon black
(D) same as analyte element of interest
15- In atomic emission spectroscopy the flame acts as
(i) Source of excitation;
(ii) Source of light;
(iii) source of vaporization;
(iv) Source of ionization
(A) (i) and (ii)
(B) (iii) and (ii)
(C) (ii) and (iv)
(D) (i) and (iii)
16- In atomic absorption spectroscopy the most strongly absorbed light is called as
(A) Resonance line
(B) Base line
(C) stokes line
(D) anti-stokes line
17- For some kind of analysis in atomic spectroscopy, nitrogen is allowed to flow over the flame
(A) To control temperature
(B) To prevent turbulence
(C) To exclude atmospheric oxygen
(D) To remove water in the flame
18- The broadening of the spectral line in atomic emission spectroscopy may be due to
(i) Vibrational transitions;
(ii) Lorentz effect;
(iii) quenching;
(iv) rotational transitions
(A) (ii) and (iii)
(B) (i) and (ii)
(C) (ii) and (iv)
(D) (i) and (iv)
19- Which of the following is an example of anionic interference in atomic emission spectroscopy?
(A) Interference of high concentration of sodium ions in assay calcium ions.
(B) Interference by formation of less volatile salt with sulphates by calcium.
(C) Increased viscosity of the analyte solution by sugars.
(D) Decreased drop size of the analyte solution by alcohols.
20- Releasing agents are used in atomic emission spectroscopy to prevent
(A) Cationic interference
(B) Anionic interference
(C) Both anionic and cationic
(D) Physical interference
21- Choose the correct sequence of process during Atomization in atomic absorption spectroscopy
(A) Desolvation – Nebulization – Dissociation – Volatilization – Ionization ion
(B) Nebulization – Desolvation – Volatilization – Dissociation – Ionization ion
(C) Desolvation – Nebulization – Volatilization – Dissociation – Ionization ion
(D) Nebulization – Volatilization – Desolvation – Dissociation – Ionization
ANSWERS:
1-(A), 2-(C), 3-(C), 4-(A), 5-(B), 6-(D), 7-(D), 8-(D), 9-(B), 10-(D), 11-(D), 12-(A), 13-(A), 14-(D), 15-(D), 16-(A), 17-(C), 18-(A), 19-(B), 20-(B), 21-(C)