Question 1

The ____________ is an important requirement of the aquatic life.

Accepted Answer

A)  Dissolved nitrogen
B)  Dissolved chlorine
C)  Dissolved oxygen
D)  Dissolved methane C

Question 2

Waste water released from _________ are not the sources of bacteria.

Accepted Answer

A)  Sanitaria
B)  Municipalities
C)  Tanning
D)  Industries D

Question 3

Fishes can store more quantity of ___________ in their bodies.

Accepted Answer

A)  Mercury
B)  Bismuth
C)  Palladium
D)  Chlorine A

Question 4

________ is used to find the D.O content of sewage.

Accepted Answer

A)  Winkler method
B)  Chromatography
C)  Kjeldahl method
D)  Olfactometer

Question 5

Which chemical is used for the titration of waste water for finding its chloride content?

Accepted Answer

A)  Potassium chloride
B)  Sodium chloride
C)  Potassium chromate
D)  Potassium dichromate

Question 6

Amoebic dysentery is caused by ___________

Accepted Answer

A)  Viruses
B)  Bacteria
C)  Helminth
D)  Protozoa

Question 7

The decomposition of sewage takes place, causing a pungent smell. Which of the following causes the pungent smell?

Accepted Answer

A)  CO2
B)  H2SO4
C)  HCL
D)  H2S

Question 8

Bacteria in water causes ________

Accepted Answer

A)  Malaria
B)  Typhoid
C)  Dengue
D)  Chicken guinea

Question 9

Helminth in the water causes __________

Accepted Answer

A)  Hook worm
B)  Amoebic dysentery
C)  Cholera
D)  Typhoid

Question 10

Bacteria and micro organisms present in the water will cause _________ in human and animals.

Accepted Answer

A)  Indigestion
B)  Intestinal tract
C)  Brain tumour
D)  Cancer

Question 11

The disappearance of the plants and animals is due to the _________ in water. www.rejinpaul.comwww.rejinpaul.com Download updated materials from Rejinpaul Network App

Accepted Answer

A)  Nitrogen depletion
B)  Chlorine depletion
C)  Oxygen depletion
D)  Ozone depletion

Question 12

Imhoff cone is used to measure the _______

Accepted Answer

A)  Suspended solids
B)  Settleable solids
C)  Dissolved solids
D)  Total solids

Question 13

The permissible dose of chloride in domestic sewage is __________

Accepted Answer

A)  120ppm
B)  10ppm
C)  1ppm
D)  250ppm

Question 14

The presence of free ammonia in sewage represents ____________

Accepted Answer

A)  Air pollution
B)  Old pollution
C)  Recent pollution
D)  Water pollution

Question 15

The organic matter present in the water is of __________ types.

Accepted Answer

A)  Two
B)  Three
C)  Four
D)  Five

Question 16

Infectious hepatitis is caused by ___________

Accepted Answer

A)  Bacteria
B)  Viruses
C)  Protozoa
D)  Helminth

Question 17

The temperature of sewage increases. What will be the effect on the dissolved oxygen in sewage?

Accepted Answer

A)  Remains constant
B)  Increase
C)  Decrease
D)  No effect

Question 18

The optimum value in natural water is ________

Accepted Answer

A)  2-4ppm
B)  4-7ppm
C)  4-6ppm
D)  2-7ppm

Question 19

What is the minimum quantity of dissolved oxygen that should be present in the treated sewage?

Accepted Answer

A)  6ppm
B)  4ppm
C)  1ppm
D)  10ppm

Question 20

___________ poisoning water in Japan is from fishes.

Accepted Answer

A)  Bismuth
B)  Arsenic
C)  Antimony
D)  Palladium

Exam 1: Understanding Water Pollution and Its Effects on Aquatic Life