# Analytical Instrumentation MCQ (Interview-Exam) Question-Answer – Spectral Method of Analysis

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## Spectral Method of Analysis

Q.1 Which type of Quantum Transition takes place in Ultra Violet and Visible spectroscopy?

A. Nuclear

B. Spin of nuclei in a magnetic field

C. Rotation of molecules

D. Bonding electrons

Ans : Bonding electrons

Q.2 Spectroscopy deals with interaction of electromagnetic radiation with matter. What is the speed of this radiation in vacuum in m/s?

A. 5 x 108

B. 3 x 108

C. 6 x 108

D. 7 x 108

Ans : 3 x 108

Q.3 Which of the following is not a type of Spectroscopy?

A. X ray

B. Sound

C. Gamma ray

D. Nuclear magnetic resonance

Ans : Sound

Q.4 Which of the following is not a property or parameter of electromagnetic radiation?

A. Voltage

B. Amplitude

C. Wavelength

D. Wave number

Ans : Voltage

Q.5 Which of the following is false about the wavelengths of electromagnetic radiation?

A. Energy does not depend on wavelength

B. Energy depends on wavelength

C. Radiation with short wavelengths have high energies

D. Radiation with long wavelengths have low energies

Ans : Energy does not depend on wavelength

Q.6 Electromagnetic radiation can travel through a vacuum.

A. True

B. False

Ans : True

Q.7 How is the wave number of electromagnetic radiation related to wavelength?

A. It is directly proportional to wavelength

B. It is equal to wavelength

C. It is the reciprocal of wavelength

D. It is not related to wavelength

Ans : It is the reciprocal of wavelength

Q.8 Which of the following is the wavelength of microwave radiation?

A. 0.78 – 30µm

B. 0.75 – 3.75 mm

C. 10 – 780nm

D. 0.6 – 10 m

Ans : 0.75 – 3.75 mm

Q.9 Velocity of electromagnetic radiation is more in a vacuum than in any medium.

A. True

B. False

Ans : True

Q.10 Which of the following is the wavenumber of UV and Visible radiation?

A. 1 x 106 to 1.3 x 104 m

B. 1 x 106 to 1.3 x 104 m2

C. 1 x 106 to 1.3 x 104 m-1

D. 13 – 27 m-1

Ans : 1 x 106 to 1.3 x 104 m-1

## Spectral Method of Analysis in Analytical Instrumentation Engineering

### Principle of Spectral Analysis:

• Spectral analysis involves studying the interaction of electromagnetic radiation with matter.
• The fundamental principle is based on the unique spectral fingerprint of each material, which can be used for identification and quantification.

### Electromagnetic Spectrum:

• Understanding the electromagnetic spectrum is essential for spectral analysis.
• Techniques often cover a broad range, including ultraviolet (UV), visible (VIS), infrared (IR), and sometimes microwave and radiofrequency regions.

### Instrumentation and Techniques:

• Spectrophotometry: Measures the intensity of light as a function of its wavelength, commonly used in UV-Vis spectroscopy.
• Infrared Spectroscopy (IR): Examines the absorption, emission, or reflection of infrared light for molecular identification.
• Nuclear Magnetic Resonance (NMR): Analyzes the magnetic properties of certain atomic nuclei for structural determination.
• Mass Spectrometry: Measures the mass-to-charge ratio of ions for qualitative and quantitative analysis.