Analytical instruments MCQ Quiz Hub

1. Spectroscopy deals with interaction of electromagnetic radiation with matter. What is the speed of this radiation in vacuum in m/s?
Rotation of molecules
Nuclear
Bonding electrons
Spin of nuclei in magnetic field

2. Which of the following is not a property or parameter of electromagnetic radiation?
Wavelength
Voltage
Wave number
Amplitude

3. Which of the following is not a type of Spectroscopy?
Gamma ray
X ray
Nuclear magnetic resonance
Sound

4. Which of the following is false about wavelengths of electromagnetic radiation?
Radiation with short wavelengths have high energies
Energy does not depend on wavelength
Radiation with long wavelengths have low energies
Energy depends on wavelength

5. Which of the following is the wavelength of microwave radiation?
10 – 780nm
0.78 – 30µm
0.6 – 10 m
0.75 – 3.75 mm

6. How is wave number of electromagnetic radiation related to wavelength?
It is the reciprocal of wavelength
It is directly proportional to wavelength
It is not related to wavelength
It is equal to wavelength

7. Which of the following is false about wavelengths of electromagnetic radiation?
Radiation with short wavelengths have high energies
Energy does not depend on wavelength
Radiation with long wavelengths have low energies
Energy depends on wavelength

8. Beer Lambert’s law gives the relation between which of the following?
Reflected radiation and concentration
Scattered radiation and concentration
Energy absorption and concentration
Energy absorption and reflected radiation

9. In which of the following ways, absorption is related to transmittance?
Absorption is the logarithm of transmittance
Absorption is the reciprocal of transmittance
Absorption is the negative logarithm of transmittance
Absorption is a multiple of transmittance

10. Which of the following is not a limitation of Beer Lambert’s law, which gives the relation between absorption, thickness, and concentration?
Concentration must be lower
Radiation must have higher bandwidth
Radiation source must be monochromatic
Does not consider factors other than thickness and concentration that affect absorbance

11. Beer’s law states that the intensity of light decreases with respect to ___________
Concentration
Distance
Composition
Volume

12. Lambert’s law states that the intensity of light decreases with respect to __________
Concentration
Distance
Composition
Volume

13. The representation of Beer Lambert’s law is given as A = abc. If ‘b’ represents distance, ‘c’ represents concentration and ‘A’ represents absorption, what does ‘a’ represent?
Intensity
Transmittance
Absorptivity
Admittance

14. Which of the following is not true about Absorption spectroscopy?
It involves transmission
Scattering is kept minimum
Reflection is kept maximum
Intensity of radiation leaving the substance is an indication of concentration

15. Transmittance is given as T = P/Po. If Po is the power incident on the sample, what does P represent?
Radiant power transmitted by the sample
Radiant power absorbed by the sample
Sum of powers absorbed and scattered
Sum of powers transmitted and reflected

16. Which of the following detectors does not require a battery and is also known as barrier layer cell?
Photomultiplier tube
Photovoltaic cell
Photoemissive tubes
Photo reflector

17. How is Tungsten Halogen lamp differ from normal Tungsten filament lamp used in absorption spectroscopy?
It has a tungsten filament and is filled with inert gas
Iodine is added to normal filling gas
Iodine is coated on tungsten filament
Iodine is added to inert gas

18. Instead of glass filters, why gelatin filters could not be used for a long period while both are Absorption filters?
Gelatin tends to evaporate and hence they deteriorate
Gelatin is affected by humidity in environment
They deteriorate due to absorption of heat leading to changes in gelatin
Gelation is affected by temperature in environment

19. How is Tungsten Halogen lamp differ from normal Tungsten filament lamp used in absorption spectroscopy?
It has a tungsten filament and is filled with inert gas
Iodine is added to normal filling gas
Iodine is coated on tungsten filament
Iodine is added to inert gas

20. How does continuous wedge filter differ from normal interference filter used in absorption spectroscopy?
It permits continuous selection of different wavelength
It allows narrow band of wavelengths to pass
It has two semi-transparent layers of silver
Space layer is made of a substance having low refractive index

21. How can stability of radiation be achieved in incandescent or discharge source used in Absorption Spectroscopy?
Using filters
Using monochromators
Using slits
By controlling the source voltage

22. To tolerate high operating temperatures, which of the following has to be done in incandescent or tungsten filament lamps?
Alloys must be used
Nitrogen be used instead of inert gas
Envelope is fabricated with quartz
Envelope is fabricated with copper

23. Which of the following is not a reason for laser not being generally used as a source of radiation for UV, Visible Spectroscopy?
High cost
Limited range of wavelength
Less intensity
Complex to work with

24. Which of the following statements is false about single beam absorption instruments?
Tungsten bulb is used as source
Beamsplitter is used to get parallel beam
Test tube is used as sample holder
Photovoltaic cell as detector

25. Which of the following is not an application of colorimeter?
Paints
Inks
Cosmetics
Composition detection

26. Which of the following is a source used in spectroscopy?
LASER
Tube light
Sodium vapor lamp
Tungsten lamp

27. In which of the following ways, absorption is related to transmittance?
Absorption is the logarithm of transmittance
Absorption is the reciprocal of transmittance
Absorption is the negative logarithm of transmittance
Absorption is a multiple of transmittance

28. Beer’s law states that the intensity of light decreases with respect to ___________
Concentration
Distance
Composition
Volume

29. Lambert’s law states that the intensity of light decreases with respect to __________
Concentration
Distance
Composition
Volume

30. Which of the following is not true about Absorption spectroscopy?
It involves transmission
Scattering is kept minimum
Reflection is kept maximum
Intensity of radiation leaving the substance is an indication of concentration