All Free Everyday Science MCQs with Answers

1441. The protein content of edible portion of egg is___________?

• A. 13 %
• B. 13.3%
• C. 14 %
• D. 14.5%Downloading Digital Educational Resources

Explanation: The edible portion of a hen's egg contains about 13.3 percent protein, though the exact value can vary slightly with egg size and composition.

1442. Alzheimer's disease in human beings is characterized by the degeneration of _______

• A. Kidney cells
• B. Nerve cells
• C. Liver cells
• D. Spleen cells

Explanation: Alzheimer's disease progressively damages neurons, especially in brain regions involved in memory and thinking. Kidney, liver and spleen cells are not the defining target of this disease.

1443. Which among the following is responsible for producing color of human skin ___?

• A. Insulin
• B. Vitamin K
• C. Melanin
• D. DNA

Explanation: Melanin is the pigment produced by melanocytes that gives skin its colour and helps protect it from ultraviolet radiation. Insulin and vitamin K have metabolic and blood-clotting roles, while DNA carries genetic information.

1444. In which part of the eye lies the pigment that decides the colour of the eyes of a person___?

• A. Retina
• B. Iris
• C. Cornea
• D. Pupal

Explanation: The iris contains melanin-producing cells, and the amount and distribution of this pigment determine eye colour. The retina detects light, whereas the cornea is the transparent front surface of the eye.

1445. The vitamin which is generally excreted by humans in urine is__________?

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

Explanation: Vitamin C is water-soluble, so the body stores little of it and excess amounts are removed in urine. Vitamins A and B12 are stored more substantially, while vitamin B is an imprecise group name.

1446. The Virus of AIDS affects the growth of_____________?

• A. Hemoglobin
• B. RBCs in blood
• C. T cells in blood
• D. Grey Cells in blood

Explanation: HIV, the virus that causes AIDS, attacks CD4 helper T cells and progressively weakens immune function. It does not specifically target haemoglobin or red blood cells.

1447. Muscle fatigue is caused by the accumulation of___________?

• A. Uric acid
• B. Lactic acid
• C. Oxalacetic acid
• D. Fyruvie acid

Explanation: During intense exercise with insufficient oxygen, muscles produce lactic acid through anaerobic respiration, and its associated metabolic changes contribute to fatigue. Uric acid is mainly a waste product of purine breakdown.

1448. Which of the following vitamins is synthesized in the body by intestinal bacteria_______?

• A. Vitamins B1
• B. Vitamins B12
• C. Vitamins E
• D. Vitamins K

Explanation: Intestinal bacteria can synthesize vitamin K, and this is why vitamin K is the standard answer in basic biology questions. The amount produced may not fully meet a person’s needs, so dietary intake remains important.

1449. Cow milk is a rich source of____________?

• A. vitamin C
• B. vitamin B
• C. vitamin A
• D. vitamin K

Explanation: Cow’s milk is a recognised source of vitamin A, particularly in its fat component and in fortified milk. It also contains some B vitamins, but vitamin C and vitamin K are not its main strengths.

1450. AIDS virus is______________________

• A. Single-stranded RNA
• B. Single-stranded DNA
• C. Double-stranded RNA
• D. Double-stranded DNA

Explanation: HIV, the virus that causes AIDS, carries its genetic material as single-stranded RNA. It uses reverse transcriptase to make DNA inside the host cell, but the virus itself is classified as an RNA virus.