Question 1

___________ poisoning water in Japan is from fishes.
A)Bismuth
B)Arsenic
C)Antimony
D)Palladium

Accepted Answer

Arsenic poisoning in water in Japan, historically known as itai-itai disease, was primarily caused by the consumption of fish contaminated with arsenic, a toxic element. This contamination was a result of industrial pollution.

Question 2

Fishes can store more quantity of ___________ in their bodies.
A)Mercury
B)Bismuth
C)Palladium
D)Chlorine

Accepted Answer

Fishes can store more quantity of mercury in their bodies due to bioaccumulation, particularly in water bodies contaminated with mercury. This process leads to higher concentrations of mercury in fish than in the surrounding water.

Question 3

Waste water released from _________ are not the sources of bacteria.
A)Sanitaria
B)Municipalities
C)Tanning
D)Industries

Accepted Answer

Industries typically release chemical pollutants rather than bacteria, whereas sanitaria, municipalities, and tanning processes can release bacteria into wastewater.

Question 4

Bacteria and micro organisms present in the water will cause _________ in human and animals.
A)Indigestion
B)Intestinal tract
C)Brain tumour
D)Cancer

Accepted Answer

Intestinal tract is the correct answer because bacteria and micro organisms present in the water can cause intestinal tract infections in humans and animals.

Question 5

Infectious hepatitis is caused by ___________
A)Bacteria
B)Viruses
C)Protozoa
D)Helminth

Accepted Answer

Infectious hepatitis is primarily caused by viruses, including several different hepatitis viruses such as Hepatitis A, B, C, D, and E.

Question 6

Amoebic dysentery is caused by ___________
A)Viruses
B)Bacteria
C)Helminth
D)Protozoa

Accepted Answer

Amoebic dysentery is caused by a protozoan parasite known as Entamoeba histolytica.

Question 7

Bacteria in water causes ________
A)Malaria
B)Typhoid
C)Dengue
D)Chicken guinea

Accepted Answer

Typhoid fever is caused by the bacterium Salmonella typhi, which is transmitted through contaminated water or food.

Question 8

Helminth in the water causes __________
A)Hook worm
B)Amoebic dysentery
C)Cholera
D)Typhoid

Accepted Answer

Hookworm infections can be caused by larvae present in contaminated soil or water, which penetrate the skin of humans.

Question 9

The ____________ is an important requirement of the aquatic life.
A)Dissolved nitrogen
B)Dissolved chlorine
C)Dissolved oxygen
D)Dissolved methane

Accepted Answer

Dissolved oxygen is crucial for the respiration of fish and other aquatic organisms. It is a key indicator of water quality and necessary for the survival of aquatic life.

Question 10

The optimum value in natural water is ________
A)2-4ppm
B)4-7ppm
C)4-6ppm
D)2-7ppm

Accepted Answer

The optimum value for dissolved oxygen in natural water is typically between 4-6 ppm, which is necessary to support aquatic life.

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

Accepted Answer

The disappearance of plants and animals in aquatic environments is often due to oxygen depletion. This condition, known as hypoxia, can occur due to various factors, including excessive nutrient pollution from human activities, which leads to overgrowth of algae. When the algae die and decompose, significant amounts of oxygen are consumed, leaving insufficient oxygen for aquatic life.

Question 12

The decomposition of the matter produces into ___________ and in presence of ____________
A)Carbondioxide and oxygen
B)Oxygen and nitrogen
C)Nitrogen and carbondioxide
D)Nitrogen and chlorine

Accepted Answer

The decomposition of matter produces carbon dioxide and oxygen in the presence of heat.

Question 13

The organic matter present in the water is of __________ types.
A)Two
B)Three
C)Four
D)Five

Accepted Answer

The organic matter present in water is of two types: biodegradable and non-biodegradable. Biodegradable organic matter can be broken down by microorganisms, while non-biodegradable cannot.

Question 14

The temperature of sewage increases. What will be the effect on the dissolved oxygen in sewage?
A)Remains constant
B)Increase
C)Decrease
D)No effect

Accepted Answer

As the temperature of sewage increases, the solubility of oxygen in water decreases, leading to a decrease in dissolved oxygen levels.

Question 15

What is the minimum quantity of dissolved oxygen that should be present in the treated sewage?
A)6ppm
B)4ppm
C)1ppm
D)10ppm

Accepted Answer

The minimum quantity of dissolved oxygen that should be present in the treated sewage is 4ppm. This level is considered safe for the discharge into water bodies, ensuring minimal environmental impact and supporting aquatic life.

Question 16

The presence of which of the following in sewage indicates nitrogen content before decomposition of sewage?
A)Nitrites
B)Nitrates
C)Free ammonia
D)Albuminoid nitrogen

Accepted Answer

The answer of The presence of which of the following...

Question 17

The presence of free ammonia in sewage represents ____________
A)Air pollution
B)Old pollution
C)Recent pollution
D)Water pollution

Accepted Answer

The presence of free ammonia in sewage indicates recent pollution because ammonia is one of the first products formed during the decomposition of organic matter.

Question 18

Which chemical is used for the titration of waste water for finding its chloride content?
A)Potassium chloride
B)Sodium chloride
C)Potassium chromate
D)Potassium dichromate

Accepted Answer

Potassium chromate is used as an indicator in the titration of chloride ions with silver nitrate.

Question 19

The type of solids which floats in sewage is __________
A)Suspended solids
B)Settleable solids
C)Dissolved solids
D)Total solids

Accepted Answer

Suspended solids are the type of solids that float in sewage because they are not heavy enough to settle at the bottom and are not dissolved in the liquid.

Question 20

The presence of which of the following indicates old pollution? A)Nitrates B)Nitrites C)H₂S D)Sulfates

Accepted Answer

Sulfates are the end product of the oxidation of sulfur-containing compounds and indicate old pollution.

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

___________ poisoning water in Japan is from fishes.

Fishes can store more quantity of ___________ in their bodies.

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

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

Infectious hepatitis is caused by ___________

Amoebic dysentery is caused by ___________

Bacteria in water causes ________

Helminth in the water causes __________

The ____________ is an important requirement of the aquatic life.

The optimum value in natural water is ________

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

The decomposition of the matter produces into _ and in presence of __

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

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

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

The presence of which of the following in sewage indicates nitrogen content before decomposition of sewage?

The presence of free ammonia in sewage represents ____________

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

The type of solids which floats in sewage is __________

The presence of which of the following indicates old pollution?