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11 Questions

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28 Water Analysis MCQ1

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Questions and Answers

What is the principle behind Atomic Absorption Spectrometry?

Atoms in the excited state emit light of a particular wavelength

Molecules in the excited state emit light of a particular wavelength

Molecules in the ground state absorb light of a particular wavelength

Atoms in the ground state absorb light of a particular wavelength (correct)

What is the purpose of adding a DPD no. 1 tablet to a swimming pool water sample?

To estimate the suspended solids in the water sample

To test for the presence of nitrate ions

To measure the pH of the water sample

To determine the concentration of free chlorine (correct)

What is the unit of measurement for Biochemical Oxygen Demand (BOD)?

g/L

mg/L

ppm (correct)

mg/mL

What is the purpose of the Winkler Titration?

To find the concentration of dissolved oxygen (O₂) in a water sample Signup and view all the answers

What is the purpose of adding ammonium molybdate in anion testing for phosphate?

To produce a yellow precipitate Signup and view all the answers

What is the principle behind pH measurement using Universal indicator paper?

The colour of the paper changes according to the pH of the sample Signup and view all the answers

What is the physical state of the atoms that absorb radiation in Atomic Absorption Spectrometry?

Ground state Signup and view all the answers

What is the duration for which a water sample is kept in the dark for the Biochemical Oxygen Demand (BOD) test?

5 days Signup and view all the answers

What is the colour of the product formed when free chlorine oxidizes DPD in a swimming pool water sample?

Red Signup and view all the answers

What is the temperature at which the Biochemical Oxygen Demand (BOD) test is conducted?

20°C Signup and view all the answers

Which of the following methods is used to measure the concentration of dissolved oxygen in a water sample?

Winkler Titration Signup and view all the answers