All Free Everyday Science MCQs with Answers

1271. The human heart is _______ ?

• A. Ampullary Heart
• B. Pulsating Heart
• C. Myogenic Heart
• D. Neurogenic Heart

Explanation: The human heart is myogenic because its contractions originate within the cardiac muscle, especially the sinoatrial node, rather than being initiated by nerves. A neurogenic heart depends directly on nerve impulses to start each beat.

1272. Which of the following pairs belong to the category of cold blooded animals?

• A. Snakes and birds
• B. Bat and rats
• C. Frog and snakes
• D. Birds and monkey

Explanation: Frogs and snakes are ectothermic, commonly called cold-blooded, so their body temperature largely follows the surroundings. Birds, bats, rats, and monkeys are endothermic animals.

1273. Which among the following types of lenses are prescribed by doctors for a patient suffering from astigmatism?

• A. Cylindrical Lens
• B. Concave Lens
• C. Spherical Lens
• D. Convex Lens

Explanation: Astigmatism results from unequal curvature in different directions of the cornea or lens, so a cylindrical lens corrects the differing focal powers. Ordinary spherical lenses cannot correct this directional distortion alone.

1274. A doctor who specializes in diseases of the nose?

• A. Rhinologist
• B. Otologist
• C. Pathologist
• D. Podiatrist

Explanation: A rhinologist specializes in diseases of the nose and related structures. An otologist deals mainly with the ear, while a podiatrist treats the foot.

1275. What animal has longest gestation period of about 640 to 660 days or 95 weeks of any land animal ?

• A. Blue Whale
• B. Elephant
• C. Opossum
• D. None of these

Explanation: The elephant has the longest gestation period among land animals, lasting about 20 to 22 months, or roughly 640 to 660 days. A blue whale is not a land animal, so it does not fit the question’s category.

1276. Which of the following is the world's loudest bird ?

• A. White bellbird
• B. Peacock
• C. Piha
• D. None of the above

Explanation: The white bellbird is widely reported as the loudest known bird, with calls measured at about 125 decibels at close range. Peacock and piha calls are loud or distinctive but do not hold this record.

1277. Which of the following protects the body against infectious disease and foreign invaders?

• A. Leukocytes
• B. Red blood cells
• C. Endoplasmic reticulum (ER)
• D. Golgi apparatus

Explanation: Leukocytes, or white blood cells, identify and attack pathogens and other foreign materials. Red blood cells mainly transport oxygen, while the endoplasmic reticulum and Golgi apparatus are cell structures rather than immune defenses.

1278. What's the Strongest Muscle in the Human Body based on its weight?

• A. Hands
• B. Masseter
• C. Neck
• D. Legs

Explanation: The masseter is commonly described as the strongest muscle relative to its weight because it can exert a very large force while closing the jaw. Claims about the strongest muscle vary with the measurement used, but masseter is the standard answer to this wording.

1279. Which of the following is the study of micro- organisms, mostly viruses and single called organisms such as bacteria, yeasts and protozoa ?

• A. Microbiology
• B. Micrology
• C. Histopathology
• D. Tavelogy

Explanation: Microbiology studies microorganisms such as bacteria, yeasts, protozoa and many viruses. Micrology is not the standard name for this biological discipline, and histopathology concerns diseased tissues.

1280. "Gastric juice" is a secretion of the glands present in________?

• A. Gall Bladder
• B. Kidneys
• C. Stomach
• D. None of these

Explanation: Gastric juice is produced by glands in the stomach lining and contains hydrochloric acid and digestive enzymes. The gall bladder stores bile, while the kidneys produce urine rather than gastric juice.