All Free Everyday Science MCQs with Answers

1241. Vitamin B1 is also known as____________?

• A. Riboflavin
• B. Retinol
• C. Thiamine
• D. Niacin

Explanation: Vitamin B1 is thiamine, which is important for carbohydrate metabolism and normal nerve function. Riboflavin is B2, niacin is B3, and retinol is vitamin A.

1242. A branch of medicine dealing with eyes and related diseases is called_________?

• A. Opthalmology
• B. Obstetrics
• C. Physiology
• D. Haematology

Explanation: Ophthalmology is the medical specialty concerned with the eyes and their diseases. Obstetrics deals with pregnancy and childbirth, while physiology studies normal body functions.

1243. Disease beri beri is because of___________?

• A. Lack of green vegetables in diet
• B. Use of milled rice
• C. Deficiency of calcium in bones
• D. Poor use of citrus fruits

Explanation: Beriberi results from severe vitamin B1, or thiamine, deficiency, which commonly occurs when polished or milled rice forms the main diet. Citrus deficiency causes scurvy, not beriberi.

1244. Insects responsible for transmitting diseases are called___________?

• A. Drones
• B. Vectors
• C. Hybirds
• D. None of these

Explanation: A vector is an organism that transmits a disease-causing agent between hosts, such as a mosquito transmitting malaria parasites. The term is broader than insects, although many important vectors are insects.

1245. Lock Jaw i.e. difficulty in opening the mouth, is a symptom of___________?

• A. Chlorea
• B. Plague
• C. Diphtheira
• D. Tetanus

Explanation: Tetanus causes painful muscle spasms, including contraction of the jaw muscles known as lockjaw. Diphtheria mainly affects the throat and can form a thick membrane there.

1246. Virus is__________?

• A. unicellular
• B. multicellular
• C. acellular
• D. none of these

Explanation: Viruses are acellular because they have no complete cell structure or independent cellular metabolism. They reproduce only inside living host cells.

1247. Joint in which bones are joined together by fibrous tissues is called _____________ ?

• A. Fibrous joint
• B. Cartilaginous joint
• C. Synovial joint
• D. Ball and socket joint

Explanation: A fibrous joint connects bones with dense fibrous connective tissue and allows little or no movement, as in skull sutures. Synovial joints have a fluid-filled cavity and permit wide movement.

1248. Which part of the body is attacked by "Gingivitis" disease?

• A. Eyes
• B. Nails
• C. Gums
• D. Nostrils

Explanation: Gingivitis is inflammation of the gums, usually caused by plaque buildup around the teeth. It can produce redness, swelling and bleeding during brushing.

1249. How many chambers are in the human heart ?

• A. 02
• B. 03
• C. 04
• D. 05

Explanation: The human heart has four chambers: two atria that receive blood and two ventricles that pump it out. This arrangement keeps oxygen-rich and oxygen-poor blood largely separate.

1250. In human, Which body part develop first ?

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

Explanation: The heart is the first major organ to form and begin functioning in the developing embryo. It starts beating early, before the brain, lungs and kidneys are fully developed.