Human Health and Diseases Chapter-Wise Test 20

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following drugs is classified as an opioid?

Cocaine
Heroin
Nicotine
Amphetamine
2

Heroin is an opioid drug derived from morphine and acts as a depressant on the central nervous system.

Which of the following statements about histamine is incorrect?

Histamine is involved in allergic reactions.
Histamine is released by mast cells.
Histamine reduces inflammation.
Histamine causes vasodilation.
3

Histamine does not reduce inflammation; instead, it promotes inflammation by causing blood vessels to dilate.

Which of the following statements about vaccines is correct?

Vaccines stimulate active immunity.
Vaccines provide passive immunity.
Vaccines do not generate memory cells.
Vaccines directly kill pathogens.
1

Vaccines stimulate active immunity by prompting the immune system to create memory cells.

Which type of vaccine contains weakened live pathogens?

Killed vaccine
Live-attenuated vaccine
Toxoid vaccine
Recombinant vaccine
2

Live-attenuated vaccines contain weakened pathogens that stimulate an immune response without causing disease.

Which of the following statements about neutrophils is incorrect?

Neutrophils are a type of white blood cell.
Neutrophils play a role in phagocytosis.
Neutrophils produce antibodies.
Neutrophils help fight bacterial infections.
3

Neutrophils do not produce antibodies; instead, they engulf and destroy pathogens through phagocytosis.

Which of the following statements about T-helper cells is correct?

T-helper cells activate other immune cells.
T-helper cells directly kill virus-infected cells.
T-helper cells function in the innate immune response.
T-helper cells produce antibodies.
1

T-helper cells (CD4+ T-cells) activate B-cells and cytotoxic T-cells to enhance immune responses.

Which test is used for the diagnosis of typhoid fever?

ELISA test
Widal test
Western blot
PCR test
2

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

Which immune response involves the activation of antibodies against a pathogen?

Innate immunity
Cell-mediated immunity
Humoral immunity
Passive immunity
3

Humoral immunity involves the production of antibodies by B-cells to neutralize pathogens.

Which of the following diseases is caused by a helminth parasite?

Amoebiasis
Filariasis
Pneumonia
Tuberculosis
2

Filariasis is caused by the helminth Wuchereria, which affects the lymphatic system.

Which of the following is an example of a live-attenuated vaccine?

Hepatitis B vaccine
BCG vaccine
DPT vaccine
Tetanus toxoid
2

The BCG vaccine is a live-attenuated vaccine used for immunization against tuberculosis.

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