Top 10 viva/interview questions on pH value of wastewater test

April 18, 2017
The term pH refers to the measure of hydrogen ion concentration in a solution and defined as the negative log of H+ ions concentration in water and wastewater. The values of pH 0 to a little less than 7 are termed as acidic and the values of pH a little above 7 to 14 are termed as basic. When the concentration of H+ and OH– ions are equal then it is termed as neutral pH.


1. pH is defined as__________. 

a) Logarithm of Hydrogen ions concentration 
b) Negative logarithm of Hydrogen ions concentration 
c) Hydrogen ion concentration 
d) OH ion concentration 

2. pH of neutral water is__________. 

a) less than 7 
b) more than 7 
c) 7.0 
d) 0.0 

3. The acceptable value of pH of potable water is__________. 

a) 7.0 to 8.5 
b) 6.5 to 9.5 
c) 6 to 8.5 
d) 6.5 to 10


4. The inner solution present in the glass electrode of pH meter is__________. 

a) HCl 
b) KCl 
c) NaCl 
d) MgCL 

5. The buffer solution can be stored for a minimum period at room temperature. 

a) True 
b) False 

6. Possible reasons for a relatively low pH value in a river water sample is due to ___. 

a) Organic material decomposition to form acidic substances 
b) Running long distances 
c) Presence of fishes 
d) Presence of aquatic plants 

7. Possible reasons for a relatively high pH value in a river water sample is due to ___. 

a) Running over clay 
b) Running long distances 
c) Running of fishes 
d) Presence of aquatic plants 

8. A weak acid is one that ionize incompletely in aqueous solution. 

a) True 
b) False 

9. A strong base is one that ionizes incompletely in aqueous solution. 

a) True 
b) False 


10. The measurement of pH made by determining the e.m.f of the__________. 

a) cell constant 
b) solution 
c) electrode cell 
d) calomel electrode

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