Free Human Body and Health MCQs with Answers

71. Name the famous book of Ibn-Sina in which he discussed human physiology and medicine ?

• A. Al-Qanun
• B. Al-Masudi
• C. New Renaissance
• D. Tadhkira
• E. None of these

Explanation: Ibn Sina's Al-Qanun fi al-Tibb, commonly called The Canon of Medicine, systematically discussed medical diagnosis, treatment and human physiology. Al-Masudi was a historical work, not his major medical encyclopedia.

72. Eugenics is the study of___________________?

• A. Altering human beings by changing their genetic components
• B. People of European region
• C. Different races of mankind
• D. Genetic of plants
• E. None of these

Explanation: Eugenics concerns attempts to influence the inherited qualities of human populations through selective reproduction or genetic intervention. It is not the study of Europeans, races in general, or plant genetics.

73. Defeciency of following vitamin decreases hemoglobin production ?

• A. Biotin
• B. Thiamine
• C. Niacin
• D. Pyridoxine
• E. None of these

Explanation: Vitamin B6, or pyridoxine, is needed for haemoglobin synthesis and normal red-blood-cell formation. Biotin, thiamine and niacin have other metabolic roles and are not the characteristic answer here.

74. The science which deals with study of manners and customs of people is ?

• A. Ethnology
• B. Morphology
• C. Ethics
• D. Genetics
• E. None of these

Explanation: Ethnology compares the cultures, social practices and customs of different peoples. Ethics deals with principles of right and wrong, while genetics studies heredity.

75. Which form of drug abuse involves most risk of infection with the HIV (AIDS) virus ?

• A. Cigarette smoking
• B. Using alcholo
• C. Injection of heroine
• D. Taking too much aspirin
• E. None of these

Explanation: Injecting heroin carries a high HIV risk when contaminated needles or syringes are shared, because infected blood enters the bloodstream directly. Smoking, alcohol and aspirin do not normally transmit HIV in this way.

76. What is the chance of diabetic baby born to parents both heterogeneous normal ?

• A. Zero
• B. ¼
• C. ½
• D. ¾
• E. None of these

Explanation: If diabetes is treated as an autosomal recessive trait, two unaffected heterozygous parents have the cross Aa × Aa, producing aa affected offspring in one out of four cases. This answer assumes the question uses the classical single-gene model of diabetes.

77. Which triplet in DNA codes for valine ?

• A. CTT
• B. AGU
• C. CAT
• D. AAT
• E. None of these

Explanation: Valine is coded by the mRNA codons GUU, GUC, GUA and GUG, corresponding to GTT, GTC, GTA and GTG on the DNA coding strand. None of the listed triplets is a valine codon.

78. Sensitive layer of the eye is?

• A. Choriods
• B. Sclerotic
• C. Retina
• D. Cornea
• E. None of these

Explanation: The retina is the light-sensitive layer containing rods and cones, which convert light into nerve signals. The cornea mainly focuses incoming light, while the sclera and choroid form protective and vascular layers.

79. The name of the common mineral salt present in sweat is ?

• A. Calcium Oxalate
• B. Potassium Sulphate
• C. Sodium Chloride
• D. Iron Sulphate
• E. None of these

Explanation: Sweat contains water and dissolved salts, especially sodium chloride, which accounts for its salty taste. Calcium oxalate and iron sulphate are not the common mineral salts of sweat.

80. Person with following blood group are considered to be universal recipient ?

• A. A+
• B. B+
• C. AB+
• D. O+
• E. None of these

Explanation: AB-positive blood is considered the universal recipient for red-cell transfusions because it has A and B antigens and Rh-positive status, but lacks anti-A and anti-B antibodies in its plasma. Compatibility testing is still required in practice.