Top 10 viva/interview questions on conductivity test of water

Conductivity of water

Conductivity of any substance may be defined as the ability of conducting heat, electricity or sound. When an electrical potential difference is created across a conductor, its ions starts flow, giving rise to an electric current. This property is called conductivity. Since the charge on ions in solution facilitates the conductance of electrical current, the conductivity of a solution is proportional to its ion concentration.

Unit of electrical conductivity is mho (Reciprocal of ohm) or siemen. The conductivity of water is that ability of water which cause an electric current. In most water, the conductivity is very low, so millisiemens or microsiemens are used as units for water conductivity. The conductivity of water is directly proportional to the concentration of the ions and their mobility.

Here are some important interview question on the topic "Conductivity of Water"

1. Conductivity is the measure of the ability of water to carry the ions.

a) True
b) False

2. The unit of conductance is _____ .

a) mho
b) ohm
c) ampere
d) watts

3. The conductivity of standard 0.01M KCl solution is

a) 1412 µmhos/ cm
b) 1412 mmhos/ cm2
c) 1412 µmhos/ mm
d) 1412 mmhos/ mm2

4. The conductivity of a sample depends on Temperature.

a) True
b) False

5. Using a conductivity meter we can measure _______ of the solution.

a) specific conductance
b) equivalent conductance
c) Specific resistance
d) concentration

6. The Conductivity is the maximum for _______ water.

a) Distilled
b) De-ionized
c) Ground
d) Sea

7. The conductivity of potable water varies from

a) 2501 to 5000 µmhos /cm
b) 50 to 1500 µmhos /cm
c) 1501 to 2000 µmhos /cm
d) 2001 to 2500 µmhos /cm

8. The measurement of conductivity may lead to the estimation of ___.

a) Total solids
b) Total dissolved solids
c) Colloidal solids
d) Suspended solids

9. Freshly made distilled water has a conductivity of

a) 2.0 to 3.0 µmhos /cm
b) 0.5 to 2.0 µmhos /cm
c) 2.5 to 4.5 µmhos /cm
d) 4.5 to 5.0 µmhos /cm

10. The conductance of a solution placed between two electrodes of 1 cm2 area & kept 1 cm apart is Molar conductance.

a) True
b) False


ANSWER KEY:
1) False
2) a
3) a
4) True
5) a
6) d
7) b
8) b
9) b
10) False

Discuss your answers and explanation in the comments section below.