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Advanced Instrumentation Techniques MCQs with Answers (Part:- 2)

Advanced Instrumentation Techniques (BP811TT)

51. What is use of mass spectroscopy?
a) Determination of molecule weight
b) Elucidating the chemical structures of molecules
c) A and B
d) None of the above
Answer: c

52. Mass spectra is also called
a) Positive ion spectra
b) Line spectra
c) A and B
d) None of the above
Answer: c

53. Highest m/z peak in mass spectrum is called as
a) Base peak
b) Fragment peak
c) Isotopic peak
d) Parent peak
Answer: a

54. Mass spectrometer requires
a) High temprature
b) High cooling
c) High vaccume
d) High pressure
Answer: c

55. Which ratio is measured by mass detector ?
a) z/m

b) e/m
c) m/e
d) m/z
Answer: d

56. Most intense peak in mass spectrum is known as
(a) Parent peak
(b) Isotope peak
(c) Metastable peak
(d) Base peak
Answer: d

57. When a molecule or ion contains odd number of nitrogen atoms, it will have an_____value of molecular weight.
(a) Even
(b) Odd
(c) Both
(d) None of these
Answer: b

58. When number of nitrogen atoms in a compound or ion is zero, the molecular weight will be_____ numbered.
(a) Odd
(b) Zero
(c) Even
(d) All
Answer: c

59. The molecular ion peak gives them______of the compound
(a) Atomic weight
(b) Atomic number
(c) Molecular weight
(d) All
Answer: c

60. Compound containing chlorine and bromine have
(a) M+2
(c) M+
Answer: a

61. Faradays cup are based on the measurement of direct_______ produced when an ion hits the surface.
(a) Potential
(b) conductance
(c) radiations
(d) charge current
Answer: d

62. ______ charged ions have lower the mass the more easily ion deflected in the magnetic field.
(a) Singly
(b) Doubly
(c) Triply
(d) All
Answer: a

63. If two fragments are in competition to produce a cation, fragment with the _______ ionization energy will be formed more frequently.
(a) Highest
(b) Lowest
(c) Neutral
(d) All
Answer: b

64. In a magnetic analyzer ions are separated on the basis of ______values
(a) Atomic number
(b) m/z
(c) Atomic mass
(d) None of these
Answer: b

65. The ability of mass spectrometer to separate two ions is defined by measuring the depth of the valleys between the peaks produced by the ions is known as
(a) Resolution
(b) Migration
(c) Both
(d) None of these
Answer: a

66. Thermal analysis is defined as ___________
a) Measurement of concentration of materials as a function of temperature
b) Measurement of solubility of materials as a function of temperature
c) Measurement of physical properties as a function of temperature
d) Measurement of line positions of crystals as a function of temperature
Answer: c

67. Which of the following method can be used for the measurement of change in weight of the oxysalts?
a) Thermoelectric analysis
b) Wagner analysis
c) Stockbarger analysis
d) Thermal analysis
Answer: d

68. What are the two main techniques for thermal analysis?
Answer: c

69. Dilatometry is also known as by which of the following names?
a) TGA
b) DTA
c) DSC
d) TMA
Answer: d

70. In thermogravimetric analysis, the result obtained appear as a __________
a) Continuous chart
b) Continuous parabola
c) Continuous circular positions
d) Discontinuous chart
Answer: a

71. What is the range of the rate in ◦Cmin-1 required during the heating process in TGA?
a) 1-20
b) 25-50

c) 100-200
d) 150-1000
Answer: a

72. Under conditions of ______________ heating, decomposition usually take place in thermogravimetry. Fill up the suitable option from the choices given below.
a) First order
b) Second order
c) Third order
d) Dynamic
Answer: d

73. The Ti and Tf temperature depends on which of the following factor?
a) Cooling rate
b) Mechanical property of the material
c) Thermal expansion coefficient
d) Atmosphere above the sample
Answer: d

74. Which of the following option is appropriate for the TGA and DTA?
a) TGA and DTA measures only weight
b) TGA measures only weight while DTA measures other effects
c) TGA and DTA measures only temperature
d) TGA measures only temperature while DTA measures other effects
Answer: b

75. In the schematic DTA sequence having reversible and irreversible changes, starting with the hydrated material, which of the following steps occurs first on heating?
a) Esterification
b) Methylation
c) Rehydration
d) Dehydration
Answer: d

76. In the application of DTA and DSC which of the following parameters is measured for the glasses?
a) Concentration of the glass
b) Solubility of the glass
c) Cooling temperature
d) Transition temperature

Answer: d

77. DTA can be used for which of the following process?
a) Line positions of the crystals
b) Mechanical properties of the crystals
c) Phase diagrams
d) Catalytic properties of enzymes
Answer: c

78. A rapid TGA method is used for which of the following process?
a) Decomposition of polymers exothermally
b) Decomposition of enzymes exothermally
c) Decomposition of crystals endothermally
d) Decomposition of reactions isothermally
Answer: d

79. Which of the following parameters can be used, using the DSC and DTA cells?
a) Catalytic properties of enzyme
b) Elasticity of crystals
c) Enthalpy of substances
d) Line positions of phases
Answer: c

80. In_________technique in which a change in the weight of a substance is recorded as function of temperature or time.
(a) Thermogravimerty
(b) Differential thermal analysis
(c) Differential scanning calorimetry
(d) None of above
Answer: a

81. Thermogravimetry (TG) is concerned with the change in weight of a material as its…..,., Changes.
(a) Pressure
(b) Temperature
(c) Frequency
(d) all
Answer: b

82. A plot of weight change versus temperature is referred to as the

(a) DSC curve
(b) DTA curve
(c)TG curve
(d) all
Answer: c

83. The difference in heat flow into the sample and reference is measured in
(a) Heat flux DSC
(b) Heat flux DTA
(c) Heat flux TG
(d) None of this
Answer: a

84. Sharp endothermic peaks give ideas of changes in
(a) Amorphous processes
(b) Crystallinity or fusion processes
(c) Cleavage processes
(d) None of this
Answer: b

85. In DTA, broad endothermic peak signify __________reactions.
(a) Dehydration
(b) Hydration
(c) Fusion
(d) All
Answer: a

86. In DTA, Physical changes give rise to_______ peak.
(a) Positive
(b) Endothermic
(c) Exothermic
(d) Negative
Answer: b

87. In DTA, chemical reaction gives rise to ______peak.
(a) Maxima
(b) Minima
(c) Exothermic
(d) Endothermic
Answer: c

88. Temperature at which the material goes from a glassy to a rubbery state is
(a) Rubber transition temperature
(b) Plastic transition temperature
(c) Chemical transition temperature
(d) Glass transition temperature
Answer: d

89. DSC can measure directly both the temperature and the_______
(a) Heat of reaction
(b) Heat of combustion
(c) Heat of formation
(d) All
Answer: a

90. X-ray diffractometers are not used to identify the physical properties of which of the following?
a) Metals
b) Liquids
c) Polymeric materials
d) Solids
Answer: b

91. X-ray diffractometers provide ____________ information about the compounds present in a solid sample.
a) Quantitative
b) Qualitative
c) Quantitative and qualitative
d) Either quantitative or qualitative
Answer: c

92. Using the powder method of diffractometers, which of the following can be determined?
a) Percentage of K+
b) Percentage of Na+ and Cl-
c) Percentage of KBr and NaCl
d) Percentage of Br-
Answer: c

93. In powder method, the powder sample is contained in which of the following?
a) Thin walled glass capillary tubes
b) Thin walled test tube
c) Thin walled curvettes
d) Thin walled flask
Answer: a

94. Which of the following is the most common instrument for photographic recording of diffraction patterns?
a) Debye-Scherrer powder camera
b) Gamma camera
c) Geiger tube
d) Scintillation counter
Answer: a

95. With the help of which of the following equations is the distance calculated from a known wavelength of the source and measured angle?
a) Coolidge equation
b) Bragg’s equation
c) Debye equation
d) Scherrer equation
Answer: b

96. In Diffractometer, the identification of a component of the sample from its powder diffraction pattern is based upon the _________ of lines and their relative ___________
a) Number, length
b) Number, intensity
c) Position, length
d) Position, intensity
Answer: d

97. Diffractometers are similar to which of the following?
a) Optical grating spectrometer
b) Prism spectrometer
c) Photo multiplier
d) Photovoltaic cell
Answer: a

98. In Diffractometers, line intensities depend on ______ and kind of atomic reflection centres in each set of plates.
a) Number

b) Position
c) Length
d) Distance between lines
Answer: a

99. In powder diffractometer, the sharpness of the lines is greatly determined by which of the
a) Quality of the sample, size of the slit
b) Quality of the slit, size of the sample
c) Thickness of the slit, amount of the sample
d) Number of slits, composition of the sample
Answer: b

100. How to produce x-ray?
a) By heating electron by uv radiation.
b) Knocking only e-
c) Loss of inner shell e– one of the outer e– will fall into the vacant orbital with the simultaneous emission of X-ray photon
d) None of the above
Answer: c

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Subject:- Advanced Instrumentation Techniques
Semester:- 8th sem, sem 8