Chemistry 9th Chap 12 : Topic 5 - Maryam Publications

Chemistry Chapter 12 : Topic 5

Water-Borne Diseases

1 / 15

Water-borne diseases such as cholera are mainly caused by drinking water contaminated with:

A) Distilled water

B) Harmful bacteria

C) Dissolved oxygen

D) Pure salts

2 / 15

Which of the following is a common water-borne disease caused by viral infection?

A) Malaria

B) Hepatitis A

C) Typhoid

D) Cholera

3 / 15

Typhoid fever spreads mainly through:

A) Air droplets

B) Contaminated water and food

C) Mosquito bites

D) Skin contact only

4 / 15

Dysentery is a water-borne disease that primarily affects the:

A) Circulatory system

B) Respiratory system

C) Nervous system

D) Digestive system

5 / 15

Which organism is commonly responsible for amoebic dysentery?

A) Virus

B) Bacteria

C) Protozoa

D) Fungus

6 / 15

Which condition increases the risk of water-borne diseases most?

A) Chlorination of water

B) Proper sewage treatment

C) Boiled water consumption

D) Open dumping of sewage into rivers

7 / 15

The most common symptom of cholera is:

A) Muscle paralysis

B) Skin rash

C) Severe diarrhea and dehydration

D) Vision loss

8 / 15

Which of the following is NOT a water-borne disease?

A) Malaria

B) Cholera

C) Typhoid

D) Dysentery

9 / 15

Hepatitis A mainly affects which organ?

A) Lungs

B) Liver

C) Heart

D) Kidneys

10 / 15

What is the most effective way to kill disease-causing microbes in drinking water?

A) Sedimentation

B) Chlorination

C) Filtration

D) Decantation

11 / 15

Boiling water before drinking helps prevent water-borne diseases because it:

A) Softens water

B) Removes salts

C) Kills microorganisms

D) Adds oxygen

12 / 15

Which practice directly reduces the spread of cholera?

A) Drinking raw river water

B) Using untreated well water

C) Avoiding hand washing

D) Proper sewage disposal

13 / 15

Why is hand washing important in preventing water-borne diseases?

A) It increases immunity directly.

B) It kills all viruses instantly.

C) It prevents transfer of pathogens from contaminated sources.

D) It removes dissolved minerals.

14 / 15

Which combination of diseases is correctly classified as water-borne?

A) Cholera, Typhoid, Dysentery

B) Malaria, Dengue, Cholera

C) Tuberculosis, Cholera, Malaria

D) Influenza, Typhoid, Dengue

15 / 15

Why is chlorinated water safer for drinking?

A) It becomes tastier.

B) It removes all minerals.

C) It kills harmful microorganisms.

D) It increases oxygen content.

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