X-Ray Fluorescence MCQs : This section focuses on the "X-Ray Fluorescence". These Multiple Choice Questions (MCQs) should be practiced to improve the X-Ray Fluorescence skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Computer-controlled corrective iteration is the only reliable method of matrix effects correction.
A. True
B. False
Question 2
Fluorescent X-ray spectrometers would require only moderate-intensity X-ray tubes.
A. True
B. False
Question 3
If the absorption of electromagnetic radiation by matter results in the emission of radiation of the same or longer wavelengths for a long or a short time, the phenomenon is termed as which of the following?
A. Luminescence
B. Fluorescence
C. Phosphorescence
D. Spontaneous emission
Question 4
If the absorption of electromagnetic radiation by matter results in the emission of radiation of the same or longer wavelengths for a long time, the phenomenon is termed as which of the following?
A. Luminescence
B. Fluorescence
C. Phosphorescence
D. Spontaneous emission
Question 5
If the absorption of electromagnetic radiation by matter results in the emission of radiation of the same or longer wavelengths for a short time, the phenomenon is termed as which of the following?
A. Luminescence
B. Fluorescence
C. Phosphorescence
D. Spontaneous emission
Question 6
In computer-controlled corrective iteration method, which of the following is used to estimate absorption corrections?
A. Initial raw intensity data
B. Elemental composition
C. Amount of sample
D. Amount of radiation
Question 7
In total reflection X-ray fluorescence spectrometer, the specimen is excited by the primary X-ray beam at a grazing angle _______ the critical angle.
A. Greater than
B. Less than
C. Equal to
D. Which is a complement of
Question 8
In X-ray fluorescence spectrometer, the relationship between the excitation intensity and the intensity of fluorescence does not depend on which of the following?
A. Spectrum of the incident radiation
B. Angle of radiance
C. Molecular weight
D. Incident angle
Question 9
Prompt emission of X-ray by an atom ionised by a higher energy X-ray is a type of which of the following phenomena?
A. Luminescence
B. Fluorescence
C. Phosphorescence
D. Spontaneous emission
Question 10
The energy of the emitted X-rays depends upon the _________ of the atom and their intensity depends upon the __________
A. Atomic number, amount of sample
B. Mass number, amount of sample
C. Mass number, concentration of atoms
D. Atomic number, concentration of atoms
Question 11
The major problem associated with sample preparation is which of the following?
A. Preparing sample in the right quantity
B. Choosing sample holders
C. Matrix effects
D. Reflection by holders
Question 12
The measurement of intensity of fluorescent X-rays provide a simple and ____________ way of _____________ analysis.
A. Destructive, quantitative
B. Non-destructive, quantitative
C. Destructive, qualitative
D. Non-destructive, qualitative
Question 13
The problem of spectral interference is not severe in X-ray spectroscopy.
A. True
B. False
Question 14
The x-ray beam produced by the primary x-ray tube passes through which of the following components to produce the incident radiation?
A. Detector
B. Slit-collimator arrangement
C. Sample reflector
D. Monochromator
Question 15
To monitor the primary beam, which of the following is used?
A. Scintillation counter
B. GM counter
C. Gamma counter
D. Proportional counter
Question 16
Total reflection X-ray fluorescence spectrometer is attractive for elements which lack reliable wet chemical methods.
A. True
B. False
Question 17
Which of the following components are used as the sample carrier?
A. Curvette
B. Flask
C. Capillary tube
D. Float glass
Question 18
Which of the following crystals are polished to act as the cut-off reflector?
A. Quartz
B. Beryllium
C. Silicon
D. Lithium
Question 19
Which of the following devices are used as a detector?
A. Thermistor
B. Optical detector
C. Solid state detector
D. Golay cell
Question 20
Which of the following happens when a large solid angle is intercepted as the detector is placed close to the sample?
A. Maximum efficiency increases
B. Maximum efficiency decreases
C. Efficiency is not affected
D. Process response becomes fast
Question 21
Which of the following is Moselys equation if C is the speed of light, a is proportionality constant, ? is a constant which depends on electronic transition series, Z is the atomic number and ? is the wavelength?
A. C?= a(Z-?)2
B. C/?= a(Z-?)2
C. C(Z-?)2= a?
D. C(Z-?)2= a/?