Biology ยท Science General

Disease Causative Agents

2,531 Questions

Disease causative agents questions test your understanding of viral, bacterial, and fungal infections, along with their transmission methods. These are common topics in general science sections of SSC and railways exams. Practice these questions to accurately identify disease pathogens and symptoms.

Viral diseasesFoodborne illnessesDisease transmission methodsExtrinsic disease factorsCommon pathogens

Disease Causative Agents Questions

Multiple choice

Which of the following is a type of chronic respiratory disease?

  1. Asthma

  2. Chronic obstructive pulmonary disease (COPD)

  3. Pneumonia

  4. Tuberculosis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tuberculosis is a type of chronic respiratory disease that is caused by a bacterium.

Multiple choice

What is the most common cause of diarrhea in children?

  1. Viral infection

  2. Bacterial infection

  3. Parasitic infection

  4. Food allergy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Viral infections are the most common cause of diarrhea in children, accounting for up to 80% of cases.

Multiple choice

What is the most common type of inflammatory bowel disease in children?

  1. Crohn's disease

  2. Ulcerative colitis

  3. Both of the above

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Crohn's disease is a chronic inflammatory bowel disease that can affect any part of the digestive tract. It is the most common type of inflammatory bowel disease in children.

Multiple choice

What is the most common cause of liver disease in children?

  1. Viral hepatitis

  2. Autoimmune hepatitis

  3. Biliary atresia

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Viral hepatitis is the most common cause of liver disease in children. It is a viral infection that can cause inflammation and damage to the liver.

Multiple choice

Which of the following is NOT a common type of infectious disease outbreak?

  1. Foodborne outbreak

  2. Waterborne outbreak

  3. Airborne outbreak

  4. Vector-borne outbreak
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vector-borne outbreaks are not as common as foodborne, waterborne, and airborne outbreaks.

Multiple choice

Which of the following is NOT a common type of surveillance used in outbreak investigations?

  1. Active surveillance

  2. Passive surveillance

  3. Sentinel surveillance

  4. Syndromic surveillance
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sentinel surveillance is not as common as active, passive, and syndromic surveillance in outbreak investigations.

Multiple choice

Which of the following is NOT a common type of infectious disease outbreak?

  1. Foodborne outbreak

  2. Waterborne outbreak

  3. Airborne outbreak

  4. Vector-borne outbreak
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vector-borne outbreaks are not as common as foodborne, waterborne, and airborne outbreaks.

Multiple choice

What is the primary mechanism by which bacteria cause disease?

  1. By producing toxins

  2. By invading and destroying host cells

  3. By stimulating the host's immune response

  4. By competing with the host for nutrients
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacteria can cause disease by producing toxins, which are harmful substances that can damage host cells and tissues.

Multiple choice

What is the primary mechanism by which viruses cause disease?

  1. By producing toxins

  2. By invading and destroying host cells

  3. By stimulating the host's immune response

  4. By competing with the host for nutrients
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Viruses cause disease by invading and destroying host cells. They do this by injecting their genetic material into the host cell, which then uses its own machinery to produce more viruses.

Multiple choice

What is the primary mechanism by which prions cause disease?

  1. By producing toxins

  2. By invading and destroying host cells

  3. By stimulating the host's immune response

  4. By converting normal proteins into abnormal proteins
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Prions cause disease by converting normal proteins into abnormal proteins. These abnormal proteins can then accumulate in the brain and cause damage to nerve cells.

Multiple choice

What are the three main stages of the pathogenesis of infectious diseases?

  1. Incubation period, prodrome, and illness

  2. Incubation period, latent period, and illness

  3. Incubation period, prodrome, and convalescence

  4. Incubation period, latent period, and convalescence
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The three main stages of the pathogenesis of infectious diseases are the incubation period, the prodrome, and the illness.

Multiple choice

What is the illness stage of an infectious disease?

  1. The time from exposure to the infectious agent to the onset of symptoms

  2. The time from the onset of symptoms to the recovery from the disease

  3. The time from exposure to the infectious agent to the recovery from the disease

  4. The time from the onset of symptoms to the death of the host
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The illness stage of an infectious disease is the time from the onset of symptoms to the death of the host.

Multiple choice

What are the four main types of virulence factors?

  1. Toxins, enzymes, adhesins, and invasins

  2. Toxins, enzymes, antigens, and antibodies

  3. Toxins, enzymes, cytokines, and chemokines

  4. Toxins, enzymes, interferons, and interleukins
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The four main types of virulence factors are toxins, enzymes, adhesins, and invasins.

Multiple choice

What are toxins?

  1. Harmful substances produced by bacteria

  2. Harmful substances produced by viruses

  3. Harmful substances produced by fungi

  4. Harmful substances produced by parasites
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Toxins are harmful substances produced by bacteria.

Multiple choice

What are some common pet food recalls?

  1. Salmonella contamination

  2. E. coli contamination

  3. Heavy metal contamination

  4. Aflatoxin contamination

  5. All of the above
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Common pet food recalls include Salmonella contamination, E. coli contamination, heavy metal contamination, and aflatoxin contamination.