Free Human Body and Health MCQs with Answers

41. Short-sightedness can be corrected by using ___________?

• A. Convex lens
• B. Concave lens
• C. Convex-concave lens
• D. Concave-convex lens

Explanation: In myopia, distant images focus in front of the retina, often because the eyeball is too long or the lens is too strong. A concave lens spreads incoming rays so the image shifts back onto the retina.

42. Trachoma is a disease of the___________?

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

Explanation: Trachoma is a bacterial infection of the eye, especially the conjunctiva and cornea, and repeated infection can cause blindness. It is not a disease of the liver, lungs or kidneys.

43. Myopia is a disease connected with_________?

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

Explanation: Myopia, or short-sightedness, is a refractive error in which nearby objects are clear but distant objects appear blurred. It results from light focusing before the retina in the eye.

44. Leukemia is a disease of the___________?

• A. Lungs
• B. Blood
• C. Skin
• D. Nerves

Explanation: Leukemia is a cancer of blood-forming tissues, particularly the bone marrow, that produces abnormal white blood cells. It consequently disrupts normal blood-cell production.

45. Medulla oblongata is a part of human ___________?

• A. Heart
• B. Brain
• C. Liver
• D. Sex organ

Explanation: The medulla oblongata is the lower part of the brainstem. It controls vital involuntary functions such as breathing, heartbeat and blood pressure.

46. Which of the following diseases is caused by virus?

• A. Small pox
• B. Tuberculosis
• C. Malaria
• D. Cholera

Explanation: Smallpox is caused by the variola virus. Tuberculosis and cholera are bacterial diseases, while malaria is caused by a Plasmodium parasite transmitted by mosquitoes.

47. Malaria is a disease which effects the____________?

• A. Heart
• B. Lungs
• C. Spleen
• D. Kidneys

Explanation: Malaria parasites infect red blood cells and are also associated with enlargement and damage of the spleen, which removes abnormal blood cells. Among the listed organs, the spleen is the expected answer.

48. A person with which of the following blood groups can receive blood of any group?

• A. A
• B. AB
• C. B
• D. O

Explanation: In the ABO blood-group system, AB individuals have both A and B antigens but no anti-A or anti-B antibodies, so they can receive red cells from A, B, AB, or O groups. Rh compatibility is an additional consideration in actual transfusions.

49. The average heartbeat per minute in a normal man is _________?

• A. 50
• B. 70
• C. 80
• D. 100Downloading Digital Educational Resources

Explanation: A healthy adult at rest commonly has a pulse of about 60 to 80 beats per minute, making 70 the best average value. Exercise, stress, age, and illness can raise or lower it.

50. Which of the following vitamins promote healthy functioning of eyes in human beings?

• A. Vitamin B
• B. Vitamin C
• C. Vitamin A
• D. Vitamin D

Explanation: Vitamin A is needed for rhodopsin, a light-sensitive pigment in the retina, and helps maintain the cornea. Its deficiency can cause night blindness and other eye problems.