Human Health and Diseases Chapter-Wise Test 12

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about autoimmune diseases is correct?

Autoimmune diseases occur when the immune system attacks its own body cells.
Autoimmune diseases are caused by bacterial infections.
Autoimmune diseases occur due to external allergens.
Autoimmune diseases can be treated with antibiotics.
1

Autoimmune diseases arise when the immune system mistakenly attacks its own cells and tissues.

Which of the following cells play a major role in allergic reactions?

Neutrophils
Macrophages
Mast cells
Cytotoxic T-cells
3

Mast cells release histamine and other chemicals during allergic reactions.

Which of the following vaccines is administered orally?

Hepatitis B vaccine
DPT vaccine
Polio (OPV) vaccine
Tetanus toxoid
3

The oral polio vaccine (OPV) is administered orally to provide immunity against poliovirus.

Which of the following statements about vaccines is incorrect?

Vaccines stimulate an immune response to create memory cells.
Vaccines provide passive immunity.
Live-attenuated vaccines contain weakened pathogens.
Toxoid vaccines contain inactivated toxins.
2

Vaccines provide **active** immunity by stimulating the immune system, not passive immunity.

Which of the following pathogens is transmitted by houseflies?

Plasmodium
Entamoeba histolytica
Wuchereria bancrofti
HIV
2

Houseflies act as mechanical carriers for Entamoeba histolytica, transmitting amoebiasis through contaminated food and water.

Which substance is responsible for the symptoms of allergy?

Histamine
Insulin
Dopamine
Acetylcholine
1

Histamine is released by mast cells during allergic reactions, causing symptoms like sneezing, itching, and inflammation.

Which of the following is an example of an autoimmune disease?

AIDS
Cancer
Rheumatoid arthritis
Influenza
3

Rheumatoid arthritis is an autoimmune disease in which the body's immune system attacks its own tissues, particularly the joints.

Which of the following statements about autoimmune diseases is correct?

Autoimmune diseases occur when the immune system attacks the body's own cells.
Autoimmune diseases are caused by bacterial infections.
The immune system fails to recognize foreign antigens in autoimmune diseases.
Antibodies are not involved in autoimmune diseases.
1

In autoimmune diseases, the immune system mistakenly attacks the body's own cells, leading to tissue damage.

Which disease is diagnosed using the Widal test?

Malaria
Tuberculosis
Typhoid
Hepatitis
3

The Widal test is used to diagnose typhoid fever by detecting antibodies against Salmonella typhi.

Which of the following diseases is prevented by the DPT vaccine?

Diphtheria, Pertussis, Tetanus
Dengue, Pneumonia, Tuberculosis
Typhoid, Polio, Malaria
Rabies, Cholera, Influenza
1

The DPT vaccine protects against diphtheria, pertussis (whooping cough), and tetanus.

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