Test: Biological Characteristics Of Water - Civil Engineering (CE) MCQ

Explanation: Bacilli (Singular-Bacillus) has a rod shaped structure. Cocci has a spherically shaped structure, Spirilla has a spiral shaped structure and Vibrio has a comma shaped structure.

Explanation: Most Probable Number is a number that indicates the bacterial density present in water.BOD and COD are the terms related to the oxygen required by microorganism to oxidize organic and inorganic matter.

Explanation: Membrane filter technique is a better and simpler technique to identify Coliforms. Various results are obtained in a shorter time than multiple tube fermentation technique. MPN test and coliform index are not used now.

Explanation: MPN test is performed at 37^oC where different samples of water are mixed with lactose broth and incubated in test tubes for 48 hours.

Explanation: Coliform bacteria is a gram negative, rod shaped and harmless aerobic microorganism which is found in the intestine of warm blooded animals including human beings.

Explanation:Amoebic dysentery is caused by protozoan infection, Infectious hepatitis and Poliomyelitis are caused by a viral infection and Typhoid fever is caused by bacterial infection.

Explanation: Agar plate count test is a test to count the number of bacterial colonies growing on a specified medium and the permissible limit for the number of bacterial colonies is 100 per ml.

Explanation: The acid and gas formation in Multiple tube fermentation technique indicates that the test is positive and there is coliform bacteria in the sample.

Explanation: The growth of Iron bacteria causes the discoloration of tank due to reddish brown deposits and turbidity in wat

Explanation: Sulphur bacteria cause the corrosion of iron and steel pipes embedded in soil. They are both aerobic and anaerobic and are more destructive in marshy or clay soils where anaerobic conditions prevails.