Top 10 viva/interview Questions on Turbidity Test

 Turbidity is the technical term referring to the cloudiness of a solution and it is a qualitative characteristic which is imparted by solid particles obstructing the transmittance of light through a water sample. Turbidity often indicates the presence of dispersed and suspended solids like clay, organic matter, silt, algae and other microorganisms.

 

1. Turbidity is caused by Clay, Silt, Organic matter and Microbes.

a) True
b) False

2. The turbidity is measured based on the

a) Light absorbing properties
b) Light Scattering properties
c) Particle Size
d) Particle mass

3. The colour of the water sample affects the turbidity.

a) True
b) False

4. In a nephelo turbidity meter the light detectors are at

a) 180°
b) 360°
c) 90°
d) 270°

5. What is the unit of turbidity.

a) TU
b) MTU
c) NTU
d) IU

6. What is the light source for the nephelo turbidity meter?

a) Tungsten filament lamp
b) Deuterium lamp
c) Hallow Cathode lamp
d) Sodium vapour lamp

7. The turbidity affects the aquatic life in the water.

a) True
b) False

8. The standard unit of turbidity is considered as that produced by

a) 2ppm of silica in distilled water
b) 1ppm of silica in distilled water
c) 4ppm of silica in distilled water
d) 9ppm of silica in distilled water

9. The material used in the standard solution for nephelometer is ___.

a) Silica
b) Clay
c) Formazin
d) Barium Chloride

10. Mixture of hydrazine sulphate and hexamethylenetetramine solution is allowed to stand for _____.

a) 24 hours
b) 12 hours
c) Minimum 6 hours
d) No specific time

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