Free Why Do We Fall Ill? 02 Practice Test - 9th Grade 

Question 1

All diseases are communicable diseases.






Solution : B

Communicable diseases are spread when a healthy individual comes in contact with a sick person. Such diseases are also spread by vectors that carry pathogens or through contaminated food and water. Non-communicable diseases like diabetes and cancer do not spread from an infected person to a healthy person.

Question 2

Which among the following disease is not caused by a virus?

B. Syphilis
C. Hepatitis B
D. Genital herpes


Solution : B

All these are sexually transmitted disease (STDs). AIDS, hepatitis B and genital herpes are caused by virus. But not all STDs are caused by virus. E.g., syphilis and gonorrhea. The causative agent for them is bacteria. Syphilis is caused by Treponema pallidum, while gonorrhea is caused by Neisseria gonorrhea respectively.

Question 3

Which of the following disease is not caused by protozoan?

A. Malaria
B. Typhoid
C. Kala-azar
D. Sleeping sickness


Solution : B

Malaria, kala-azar and sleeping sickness are caused by protozoans and typhoid is caused by bacteria.

Question 4

Which among the following will not help in the prevention of malaria?

A. Net on the windows
B. Drinking boiled water
C. Keeping the surroundings dry and clean
D. Spraying insecticides on stagnant water


Solution : B

  • Malaria is not a water-borne disease. It is a protozoan disease, caused by Plasmodium (a protozoa)The pathogens enter the body of a healthy individual via the bite of an infected female Anopheles mosquito. 
  • Malaria can be prevented by installing net on windows, keeping the surroundings neat and clean and by spraying insecticides on stagnant water. This will prevent the mosquitoes around.
  • Malaria cannot be prevented by drinking boiled water. It is a preventive measure against spreading of water-borne diseases.

Question 5

Identify the disease(s) that can be treated with antibiotics.

A. Dengue
B. Cholera
C. Anthrax
D. Hepatitis A


Solution : B and C

Antibiotics primarily work against bacterial diseases.
  Cholera is an infection of the small intestine caused by the bacterium called Vibrio cholerae.
  Anthrax is caused by the bacterium called Bacillus anthracis which may affect the skin, lungs or intestines.

On the other hand,
  Dengue is an infection which is caused by the virus.
  Hepatitis A is caused by a virus that infects liver cells and causes inflammation.

Hence, one cannot use antibiotics for dengue and hepatitis A.

Question 6

Suffering from cough in tuberculosis is a sign of the disease.

A. True
B. False


Solution : B

Suffering from cough and other weakness is a symptom of a disease. Signs of disease are what doctors determine on the basis of the symptoms.
Sign gives a definite indication of the presence of a particular disease whereas symptom is a feeling of something wrong.

Question 7

Which of the diseases have vaccines in the market currently?

A. Tetanus
C. Hepatitis A
D. Measles


Solution : A, C, and D

Vaccines are now available for preventing a whole range of infectious diseases and they form a part of public health programme of childhood immunisation.
They provide a disease-specific means of prevention. Currently, vaccines are available against diseases like tetanus, diphtheria, whooping cough, measles, hepatits A, and polio.

Question 8

The purpose of vaccination is to provide immunity.

A. True
B. False


Solution : A

The vaccine consists of dead and attenuated (harmless) microbes which when exposed to the body, creates a defence attack against the microbe and destroys it. In this process, a memory of this specific microbe is created so that when the same microbe attacks an organism next time, the immunity (strength to fight) is increased and microbe is killed much quickly.

Question 9

 _______ are the agents that act as carriers of a pathogen and spread diseases.

B. Parasites
C. Microbes
D. Vectors


Solution : D

Animals or insects carry infecting agents from a sick person to another potential host. These animals are thus the intermediaries and are termed as vectors. The most common vectors are mosquitoes.

Question 10

When the bacteria causing tuberculosis reaches the liver, it causes which disease?

A. Brain fever
B. Typhoid
C. Common cold
D. Jaundice


Solution : D

In very few cases when the bacteria causing tuberculosis, reach the liver, people may experience jaundice, which is the yellowing of skin or eyes.