Free Human Body and Health MCQs with Answers

491. The muscles, tissues and blood all are made up of____________?

• A. Carbohydrate
• B. Proteins
• C. Vitamins
• D. Fats

Explanation: Proteins are major structural and functional components of muscles, tissues and blood, including muscle fibres, connective tissue and blood proteins. These body materials also contain water and other substances, but protein is the intended nutrient category.

492. The human blood is divided into__________ groups?

• A. Two groups
• B. Three groups
• C. Four groups
• D. Five groups

Explanation: The basic ABO blood-group system divides human blood into A, B, AB and O, making four groups. The Rh factor is a separate classification, such as positive or negative.

493. Nitrogen occurs in plant and animals in the form of ___________?

• A. Minerals
• B. Fats
• C. Carbohydrates
• D. Proteins

Explanation: Plants obtain nitrogen and animals receive it mainly in proteins, which contain nitrogen in their amino acids. Fats and carbohydrates normally contain carbon, hydrogen and oxygen but no nitrogen.

494. In blood, the percentage of water is___________?

• A. 75%
• B. 85%
• C. 90%
• D. 95%Chemistry

Explanation: Blood is roughly 90% water by volume, with the remaining portion consisting mainly of blood cells, proteins, salts and other dissolved substances.

495. Which term describes the emission of light by a living organism?

• A. Natural light
• B. Bioluminescence
• C. Illumination
• D. Mimicry

Explanation: Bioluminescence is light produced by a living organism through a chemical reaction, as in fireflies and some deep-sea organisms. Illumination is simply the act or result of providing light.

496. Vitamin C is found in_________?

• A. Sea Food
• B. Seeds
• C. Fruits and Vegetables
• D. None of these

Explanation: Vitamin C is abundant in fruits and vegetables, especially citrus fruits, guava, peppers, and leafy greens. It is not generally associated with seafood or seeds as the main dietary source.

497. Tocopherol is the chemical name of which vitamin?

• A. vitamin C
• B. vitamin D
• C. vitamin A
• D. vitamin E

Explanation: Tocopherol is the collective chemical name for vitamin E, a fat-soluble antioxidant that helps protect cell membranes. Vitamin C is also an antioxidant, but it is ascorbic acid.

498. What is the name of the biggest part of human brain?

• A. Cerebellum
• B. Cerebrum
• C. Brainstem
• D. Pituitary

Explanation: The cerebrum is the largest brain region and controls higher functions such as thought, memory, language and voluntary movement. The cerebellum mainly coordinates balance and fine movement.

499. The psychological test of human emotions and personality, using inkblots, is formally known as what?

• A. Rorschach
• B. Nervous
• C. Renal
• D. All of above
• E. None of these

Explanation: The Rorschach test presents inkblot images and interprets a person's responses as clues about personality and emotional functioning. The other terms are unrelated descriptive words, not names of this test.

500. What is the rarest blood type in humans?

• A. O-
• B. O+
• C. AB+
• D. AB-

Explanation: Among the eight commonly taught ABO and Rh blood groups, AB-negative is the rarest. Rarity can vary by population, and very unusual types such as Rh-null are not included in these options.