R4RIN – MCQs, Mock Tests | Analytical instruments Analytical Instrumentation Colorimetry and Spectrometry MCQ

Spectroscopy deals with interaction of electromagnetic radiation with matter. What is the speed of this radiation in vacuum in m/s?

1. Rotation of molecules
2. Nuclear
3. Bonding electrons
4. Spin of nuclei in magnetic field

✅ Correct Answer: 3

Which of the following is not a property or parameter of electromagnetic radiation?

1. Wavelength
2. Voltage
3. Wave number
4. Amplitude

✅ Correct Answer: 2

Which of the following is not a type of Spectroscopy?

1. Gamma ray
2. X ray
3. Nuclear magnetic resonance
4. Sound

✅ Correct Answer: 4

Which of the following is false about wavelengths of electromagnetic radiation?

1. Radiation with short wavelengths have high energies
2. Energy does not depend on wavelength
3. Radiation with long wavelengths have low energies
4. Energy depends on wavelength

✅ Correct Answer: 2

Which of the following is the wavelength of microwave radiation?

1. 10 – 780nm
2. 0.78 – 30µm
3. 0.6 – 10 m
4. 0.75 – 3.75 mm

✅ Correct Answer: 4

How is wave number of electromagnetic radiation related to wavelength?

1. It is the reciprocal of wavelength
2. It is directly proportional to wavelength
3. It is not related to wavelength
4. It is equal to wavelength

✅ Correct Answer: 1

Which of the following is false about wavelengths of electromagnetic radiation?

1. Radiation with short wavelengths have high energies
2. Energy does not depend on wavelength
3. Radiation with long wavelengths have low energies
4. Energy depends on wavelength

✅ Correct Answer: 2

Beer Lambert’s law gives the relation between which of the following?

1. Reflected radiation and concentration
2. Scattered radiation and concentration
3. Energy absorption and concentration
4. Energy absorption and reflected radiation

✅ Correct Answer: 3

In which of the following ways, absorption is related to transmittance?

1. Absorption is the logarithm of transmittance
2. Absorption is the reciprocal of transmittance
3. Absorption is the negative logarithm of transmittance
4. Absorption is a multiple of transmittance

✅ Correct Answer: 3

Which of the following is not a limitation of Beer Lambert’s law, which gives the relation between absorption, thickness, and concentration?

1. Concentration must be lower
2. Radiation must have higher bandwidth
3. Radiation source must be monochromatic
4. Does not consider factors other than thickness and concentration that affect absorbance

✅ Correct Answer: 2

Beer’s law states that the intensity of light decreases with respect to ___________

1. Concentration
2. Distance
3. Composition
4. Volume

✅ Correct Answer: 1

Lambert’s law states that the intensity of light decreases with respect to __________

1. Concentration
2. Distance
3. Composition
4. Volume

✅ Correct Answer: 2

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?

1. Intensity
2. Transmittance
3. Absorptivity
4. Admittance

✅ Correct Answer: 3

Which of the following is not true about Absorption spectroscopy?

1. It involves transmission
2. Scattering is kept minimum
3. Reflection is kept maximum
4. Intensity of radiation leaving the substance is an indication of concentration

✅ Correct Answer: 3

Transmittance is given as T = P/Po. If Po is the power incident on the sample, what does P represent?

1. Radiant power transmitted by the sample
2. Radiant power absorbed by the sample
3. Sum of powers absorbed and scattered
4. Sum of powers transmitted and reflected

✅ Correct Answer: 1

Which of the following detectors does not require a battery and is also known as barrier layer cell?

1. Photomultiplier tube
2. Photovoltaic cell
3. Photoemissive tubes
4. Photo reflector

✅ Correct Answer: 2

How is Tungsten Halogen lamp differ from normal Tungsten filament lamp used in absorption spectroscopy?

1. It has a tungsten filament and is filled with inert gas
2. Iodine is added to normal filling gas
3. Iodine is coated on tungsten filament
4. Iodine is added to inert gas

✅ Correct Answer: 2

Instead of glass filters, why gelatin filters could not be used for a long period while both are Absorption filters?

1. Gelatin tends to evaporate and hence they deteriorate
2. Gelatin is affected by humidity in environment
3. They deteriorate due to absorption of heat leading to changes in gelatin
4. Gelation is affected by temperature in environment

✅ Correct Answer: 3

How is Tungsten Halogen lamp differ from normal Tungsten filament lamp used in absorption spectroscopy?

1. It has a tungsten filament and is filled with inert gas
2. Iodine is added to normal filling gas
3. Iodine is coated on tungsten filament
4. Iodine is added to inert gas

✅ Correct Answer: 2

How does continuous wedge filter differ from normal interference filter used in absorption spectroscopy?

1. It permits continuous selection of different wavelength
2. It allows narrow band of wavelengths to pass
3. It has two semi-transparent layers of silver
4. Space layer is made of a substance having low refractive index

✅ Correct Answer: 1

How can stability of radiation be achieved in incandescent or discharge source used in Absorption Spectroscopy?

1. Using filters
2. Using monochromators
3. Using slits
4. By controlling the source voltage

✅ Correct Answer: 4

To tolerate high operating temperatures, which of the following has to be done in incandescent or tungsten filament lamps?

1. Alloys must be used
2. Nitrogen be used instead of inert gas
3. Envelope is fabricated with quartz
4. Envelope is fabricated with copper

✅ Correct Answer: 3

Which of the following is not a reason for laser not being generally used as a source of radiation for UV, Visible Spectroscopy?

1. High cost
2. Limited range of wavelength
3. Less intensity
4. Complex to work with

✅ Correct Answer: 3

Which of the following statements is false about single beam absorption instruments?

1. Tungsten bulb is used as source
2. Beamsplitter is used to get parallel beam
3. Test tube is used as sample holder
4. Photovoltaic cell as detector

✅ Correct Answer: 2

Which of the following is not an application of colorimeter?

1. Paints
2. Inks
3. Cosmetics
4. Composition detection

✅ Correct Answer: 4

Which of the following is a source used in spectroscopy?

1. LASER
2. Tube light
3. Sodium vapor lamp
4. Tungsten lamp

✅ Correct Answer: 4

In which of the following ways, absorption is related to transmittance?

1. Absorption is the logarithm of transmittance
2. Absorption is the reciprocal of transmittance
3. Absorption is the negative logarithm of transmittance
4. Absorption is a multiple of transmittance

✅ Correct Answer: 3

Beer’s law states that the intensity of light decreases with respect to ___________

1. Concentration
2. Distance
3. Composition
4. Volume

✅ Correct Answer: 1

Lambert’s law states that the intensity of light decreases with respect to __________

1. Concentration
2. Distance
3. Composition
4. Volume

✅ Correct Answer: 2

Which of the following is not true about Absorption spectroscopy?

1. It involves transmission
2. Scattering is kept minimum
3. Reflection is kept maximum
4. Intensity of radiation leaving the substance is an indication of concentration

✅ Correct Answer: 3