All Free Everyday Science MCQs with Answers

1411. Which of the following disease is spread by Fleas?

• A. Small pox
• B. Tetnus
• C. Typhus
• D. Yellow fever

Explanation: Fleas can transmit murine, or flea-borne, typhus through infected flea faeces. Smallpox and yellow fever spread by other routes, while tetanus is caused by bacterial contamination of wounds rather than flea transmission.

1412. A dolphin perceives its environment by the sense of__________?

• A. Sight
• B. Sound
• C. Both of these
• D. None of these

Explanation: Dolphins use vision to observe nearby surroundings and sound-based echolocation to detect objects, distance and movement, especially underwater. Therefore both sight and sound are involved.

1413. White bloods cells are also known as________?

• A. Thrombocytes
• B. Leucocytes
• C. Erythrocytes
• D. None of These

Explanation: White blood cells are leucocytes, which help defend the body against infections. Thrombocytes are platelets, while erythrocytes are red blood cells.

1414. Human beings use _______ liters of pure oxygen per day.

• A. 550
• B. 2500
• C. 1,050
• D. 10,000

Explanation: An average person consumes roughly 550 litres of oxygen per day at rest under commonly used textbook estimates. This is oxygen actually used by metabolism, not the much larger volume of air inhaled.

1415. Scientist discovered a previously undetected feature of the human Anatomy that could be the largest organ of human body?

• A. Brass
• B. Pectora
• C. Interstitium
• D. Otic

Explanation: The interstitium is a network of fluid-filled spaces in connective tissue that was described as a possible new organ. Its extensive distribution led researchers to suggest that it could be among the body's largest organs.

1416. Growth is provided by________?

• A. Protein
• B. Minerals
• C. Vitamins
• D. Carbohydrates

Explanation: Protein supplies amino acids needed to build and repair muscles, tissues and enzymes, so it is especially associated with body growth. Carbohydrates mainly provide energy, while vitamins and minerals regulate body processes.

1417. Deficiency of Iodine causes:____________?

• A. Anemia
• B. Scurvy
• C. Goiter
• D. Rickets

Explanation: Iodine is required to make thyroid hormones, and severe deficiency enlarges the thyroid gland, producing goiter. Anemia, scurvy and rickets are mainly linked with deficiencies of iron, vitamin C and vitamin D respectively.

1418. Which of the following is not a water soluble vitamin?

• A. Tocopherol
• B. Pyridoxine
• C. Pantothenic acid
• D. Niacin

Explanation: Tocopherol is vitamin E, a fat-soluble vitamin stored in body fat. Pyridoxine, pantothenic acid and niacin are water-soluble B vitamins.

1419. The vitamin Folate works together with __________ to produce new red blood cells?

• A. Vitamin D
• B. Vitamin A
• C. Vitamin B-12
• D. None of the above

Explanation: Folate and vitamin B12 work together in DNA synthesis and the formation of healthy red blood cells. A deficiency of either can produce megaloblastic anaemia.

1420. Common food sources of Vitamin A are:___________?

• A. Milk, eggs, butter, cheese, cream, and liver
• B. White sugar, honey, and sugar cane
• C. Broccoli, apricots, cantaloupe, carrots, sweet potato, spinach
• D. Both A and C

Explanation: Vitamin A comes from animal foods such as milk, eggs, butter and liver, while carotenoid precursors occur in carrots, spinach, apricots and sweet potatoes. Therefore both groups listed in A and C are sources.