Free Human Body and Health MCQs with Answers

461. Tetanus is caused by____________?

• A. Clostridium
• B. Virus
• C. Bacteriophage
• D. Salmonella

Explanation: Tetanus is caused by the bacterium Clostridium tetani, whose spores can enter wounds and whose toxin causes severe muscle spasms. It is not caused by a virus or by Salmonella.

462. A reptile with a four-chambered heart is______________?

• A. Snake
• B. Turtle
• C. Lizard
• D. Crocodile

Explanation: Crocodiles are the only living reptiles with a fully four-chambered heart, separating oxygenated and deoxygenated blood. Snakes, turtles and lizards generally have a three-chambered heart.

463. Which creature is the symbol of Medicine?

• A. Cat
• B. Lizard
• C. Snake
• D. None of these

Explanation: The snake is associated with medicine through the Rod of Asclepius, a traditional medical symbol featuring one snake around a staff. The caduceus has two snakes and is often mistakenly used as a medical symbol.

464. Ombrophobia is fear of____________?

• A. Rain
• B. Snow
• C. Smog
• D. None of these

Explanation: Ombrophobia combines ombro, meaning rain, with phobia, meaning an intense fear. It therefore refers to fear of rain, not snow or smog.

465. The post-mortem examination of a body is called __________?

• A. Etymology
• B. autopsy
• C. Anatomy
• D. None of these

Explanation: An autopsy is the examination of a body after death to determine the cause and manner of death. Anatomy is the general study of body structure, while etymology studies word origins.

466. Chemically finger nails are made up of ____________?

• A. Carbohydrate
• B. Fats
• C. protein
• D. Starch

Explanation: Fingernails are made mainly of keratin, a tough structural protein also found in hair and the outer layer of skin. They are not made of carbohydrate, fat or starch.

467. Which of the following is not a waterborne disease?

• A. Cholera
• B. Amoebiasis
• C. Typhoid
• D. Influenza

Explanation: Influenza is caused by a virus and spreads mainly through respiratory droplets, not contaminated water. Cholera, amoebiasis and typhoid are commonly transmitted through unsafe water or food.

468. Which of the following is affected by rickets in the human body?

• A. Bones
• B. Tissues
• C. Muscles
• D. Blood

Explanation: Rickets weakens and softens developing bones because of inadequate vitamin D, calcium or phosphate. It can cause bowed legs and other skeletal deformities, rather than primarily affecting muscles or blood.

469. Which vitamin is available to the human body through sun bathing?

• A. Vitamin A
• B. Vitamin D
• C. Vitamin K
• D. Vitamin B12

Explanation: Ultraviolet B radiation from sunlight enables the skin to produce vitamin D, which helps the body absorb calcium and maintain bones. Sunlight does not supply vitamin D directly in the same way as dietary intake.

470. Which Organ is affected by trachoma?

• A. Liver
• B. Lungs
• C. Eyes
• D. Brain

Explanation: Trachoma is a bacterial infection of the eyes, especially the conjunctiva and cornea. Repeated infection can scar the eyelid and cornea and may cause blindness.