All Free Everyday Science MCQs with Answers

1251. How many calories are there in 1 gram of carbohydrate?

• A. 2
• B. 2
• C. 4
• D. 10.25

Explanation: Carbohydrates provide about 4 kilocalories per gram when metabolised. The first two options are duplicate entries for 2 and do not affect the unique correct option, c.

1252. The expected number of RBCs in a single drop, or microliter, of blood is _________ million in Men.

• A. 4.5 to 6.2 million
• B. 3.4 to 6.8 million
• C. 3.2 to 7.2 million
• D. 4.0 to 5.2 million

Explanation: Adult men commonly have about 4.5–6.2 million red blood cells per microlitre of blood. The range is higher than the usual female range because androgens stimulate red-cell production.

1253. The normal range of the number of white blood cells in a microliter of blood is between _________ ?

• A. 2,500 and 09,300
• B. 4,500 and 10,000
• C. 4,900 and 12,000
• D. None of these

Explanation: A normal white-cell count is roughly 4,500–10,000 cells per microlitre. Counts outside this range may indicate infection, inflammation, or another medical condition, though laboratory ranges vary slightly.

1254. The expected number of RBCs in a single drop, or microliter, of blood is _________ million in Women.

• A. 4.5 to 6.2 million
• B. 3.4 to 6.8 million
• C. 3.2 to 7.2 million
• D. 4.0 to 5.2 million

Explanation: Adult women commonly have about 4.0–5.2 million red blood cells per microlitre. This is generally lower than the male range because women usually have lower androgen stimulation and periodic blood loss.

1255. Main and excessive part of plasma consists of ________?

• A. Carbon dioxide
• B. Oxygen
• C. Water
• D. Glucose

Explanation: Water makes up about 90–92% of blood plasma, while proteins, salts, nutrients, and gases form the smaller remainder. Thus, water is the main component rather than glucose or oxygen.

1256. Blood does not coagulate inside the body due to the presence of___________?

• A. Haemoglobin
• B. Fibrin
• C. Heparin
• D. Plasma

Explanation: Heparin is a natural anticoagulant that inhibits clotting reactions within blood vessels. Fibrin, in contrast, is the protein thread that helps form a clot when coagulation occurs.

1257. Study of "Aging" is called __________?

• A. Gerontology
• B. Hstologyh
• C. Pysiology
• D. Anthropology

Explanation: Gerontology is the scientific study of ageing and the changes associated with it. Anthropology studies humans and cultures more broadly, while physiology studies normal body functions.

1258. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is ________ ?

• A. Argon
• B. Xenon
• C. Helium
• D. Krypton

Explanation: Helium is mixed with oxygen for deep-sea diving because it is much less soluble in body tissues than nitrogen and reduces nitrogen narcosis and decompression sickness. The other noble gases are unsuitable for this purpose.

1259. Stethoscope was invented by _______ ?

• A. Rene Laennec
• B. Steven Sasson
• C. Martin Cooper
• D. Dave Hyatt

Explanation: René Laennec invented the stethoscope in 1816 to listen to sounds produced inside the chest. The other names are associated with unrelated inventions or technologies.

1260. The medical branch of science that deals with the study of skin, its functions, diseases, & treatment is ________ ?

• A. Dermatology
• B. Dormatology
• C. Deontology
• D. Dermatoglyphics

Explanation: Dermatology is the medical specialty concerned with the skin, its diseases and their treatment. Deontology concerns professional ethics, while dermatoglyphics studies skin patterns such as fingerprints.