Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: UV Visible Spectrometers Questions and Answers
Share
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Multiple Choice Questions > UV Visible Spectrometers Questions and Answers

UV Visible Spectrometers Questions and Answers

Last updated: November 27, 2021 5:38 pm
Editorial Staff
Multiple Choice Questions
No Comments
Share
5 Min Read
SHARE

UV Visible Spectrometers Questions and Answers

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

a) Reflected radiation and concentration
b) Scattered radiation and concentration
c) Energy absorption and concentration
d) Energy absorption and reflected radiation

Answer: c

Explanation: Beer Lambert’s law gives the relation between Energy absorption and Concentration. It was proposed by Beer and Lambert.

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

a) Absorption is the logarithm of transmittance
b) Absorption is the reciprocal of transmittance
c) Absorption is the negative logarithm of transmittance
d) Absorption is a multiple of transmittance

Answer: c

Explanation: Transmittance is the ratio of the radiant power transmitted by a sample to the radiant power incident on the sample. Absorption is the negative logarithm of transmittance.

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

a) Concentration must be lower
b) Radiation must have higher bandwidth
c) Radiation source must be monochromatic
d) Does not consider factors other than thickness and concentration that affect absorbance

Answer: b

Explanation: The law is derived assuming that the radiation is monochromatic. So, if bandwidth increases it will create deviation.

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

a) Concentration
b) Distance
c) Composition
d) Volume

Answer: a

Explanation: Beer’s law states that the intensity of light decreases with the concentration of the medium. It was stated by Beer.

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

a) Concentration
b) Distance
c) Composition
d) Volume

Answer: b

Explanation: Lambert’s law states that the intensity of light decreases with respect to the concentration of the medium. It was stated by Lambert.

6. 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?

a) Intensity
b) Transmittance
c) Absorptivity
d) Admittance

Answer: c

Explanation: ‘a’ represents the absorption constant. It is also known as absorptivity.

7. Which of the following is not true about Absorption spectroscopy?

a) It involves transmission
b) Scattering is kept minimum
c) Reflection is kept maximum
d) Intensity of radiation leaving the substance is an indication of concentration

Answer: c

Explanation: In Absorption spectroscopy, reflection must also be kept minimum along with scattering. Amount of absorption depends on the number of molecules in the material.

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

a) Radiant power transmitted by the sample
b) Radiant power absorbed by the sample
c) Sum of powers absorbed and scattered
d) Sum of powers transmitted and reflected

Answer: a

Explanation: P represents radiant power transmitted by the sample. Transmittance is the ratio of radiant power transmitted by the sample to the radiant power that is incident on it.

9. What is the unit of absorbance which can be derived from Beer Lambert’s law?

a) L mol-1 cm-1
b) L gm-1 cm-1
c) Cm
d) No unit

Answer: d

Explanation: Absorbance has no unit. The units of absorptivity, distance, and concentration cancel each other. Hence, absorption has no unit.

10. What is the unit of molar absorptivity or absorptivity which is used to determine absorbance A in Beer Lambert’s formula?

a) L mol-1 cm-1
b) L gm-1 cm-1
c) Cm
d) No unit

Answer: a

Explanation: The unit of absorptivity is L mol-1 cm-1. If the concentration is represented as gm per litre it becomes L gm-1 cm-1.

Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

X-Ray Spectroscopy Questions & Answers
Nitrogen Oxides Questions & Answers
Special Designs of Ion Selective Electrodes Questions & Answers
Combination Electrode Questions & Answers
Controllability & Observability
Cascade Compensation in Time Domain
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Sodium Analyzer Questions & Answers
Top 10 Industrial safety Objective Questions
Parameter Optimization
State Models for Linear Continuous Time Systems
MCQ on Flow Measurement
Optimal Control Problems – Part 1
Cascade Compensation in Frequency Domain
Electron Spin Resonance

Keep Learning

Analyzers Questions and Answers

Infrared Gas Analyzers Questions & Answers

Chromatography Questions & Answers

Detection System of Liquid Chromatography Questions & Answers

Radiochemical Questions and Answers

Fundamentals of Radiochemical Methods Questions

Mathematical Models of Physical Systems

Signal Flow Graphs Objective Questions

Digital Circuits Questions & Answers

Logic Families Questions and Answers

State Variable Analysis and Design

Solution of State Equations

Online Analyzers Questions & Answers

Online Analyzers Questions & Answers

Nonlinear Control Systems

Stability of Nonlinear System – II

Learn More

Steam Turbine Interlocks

What are the Interlocks for Steam Turbine?

Profibus network

How Profibus Communication Works

Instrumentation Symbols Legend

Instrumentation Symbols Legend

Questions & Answers of Power Systems

Questions & Answers of Power Systems

Process Control Instrumentation Objective Questions

Process Control & Instrumentation Objective Questions – Set 2

Difference Between Modbus TCP IP and Profinet

Difference Between Modbus TCP IP and Profinet

Furnace Draft Control System

Furnace Draft Control System

Determine the statuses of all lamps and relay coils in the circuit

Determine the Status of Lamps and Relays in the Circuit ?

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?