Free Human Body and Health MCQs with Answers

101. The average adult has a blood volume of about __________ liters.

• A. 4
• B. 5
• C. 6
• D. 7

Explanation: A typical adult breathes about 5 to 8 litres of air per minute at rest, which totals roughly 7,000 to 12,000 litres per day. Therefore, 5 litres is the closest standard estimate among the options.

102. The lifespan of Red Blood Cells is __________ days?

• A. 60
• B. 120
• C. 180
• D. 240Chemistry

Explanation: Red blood cells survive for about 120 days before old cells are removed mainly by the spleen and liver. Their limited lifespan is related to the absence of a nucleus and other cell organelles.

103. Deficiency of Vitamin-A results in __________?

• A. Night blindness
• B. rickets
• C. scurvy
• D. hair fall

Explanation: Vitamin A is needed for the visual pigment rhodopsin, so its deficiency commonly causes night blindness. Rickets results from vitamin D deficiency, while scurvy results from vitamin C deficiency.

104. Long-sight defect could be corrected by using __________ lens?

• A. concave
• B. Convex
• C. diverging
• D. none of these

Explanation: Long-sightedness, or hypermetropia, occurs when near images would focus behind the retina; a convex lens brings the focus forward onto the retina. A concave or diverging lens is used for short-sightedness.

105. Severe deficiency of Vitamin D results in __________.

• A. scurvy
• B. rickets
• C. night blindness
• D. None of these

Explanation: Severe vitamin D deficiency causes rickets in children because poor calcium absorption weakens and deforms growing bones. Scurvy is caused by vitamin C deficiency, not vitamin D deficiency.

106. Which of following is the disease of eyes.?

• A. Trachoma
• B. Glaucoma
• C. Cataract
• D. All of these

Explanation: Trachoma is an infectious eye disease, glaucoma damages the optic nerve through commonly increased eye pressure, and cataract clouds the lens. Therefore all three listed conditions affect the eyes.

107. Alzheimer's disease is a _________ disorder.

• A. Genetic
• B. Brain
• C. Eye
• D. Body Weight Loss

Explanation: Alzheimer’s disease is a progressive brain disorder that damages memory and other cognitive functions. It is not simply a body-weight or eye disorder, although genetic factors can influence risk.

108. 'Alba' was a genetically modified 'glowing' ___ created as an artistic work by contemporary artist Eduardo Kac.

• A. Sheep
• B. Dog
• C. Rabbit
• D. Mouse

Explanation: Alba was a genetically modified fluorescent rabbit created by artist Eduardo Kac as the artwork GFP Bunny. The glow resulted from insertion of a green fluorescent protein gene.

109. Locked-in syndrome (LiS) is which type of disorder?

• A. Developmental
• B. Neurological
• C. Hormonic
• D. Genetic

Explanation: Locked-in syndrome is a neurological condition in which a person is conscious but almost completely paralysed, usually retaining eye movement or blinking. It is not primarily a hormonal or developmental disorder.

110. Which animal has three hearts?

• A. Crow
• B. Dolphin
• C. Octopus
• D. None of these

Explanation: An octopus has three hearts: two pump blood to the gills and one pumps it to the rest of the body. Crow and dolphin do not have this three-heart arrangement.