Everyday Science — All MCQs
2717 questions available
Q581.DNA is ____?
Correct Answer: B
DNA (Deoxyribonucleic Acid) represents a class of nucleic acids that store genetic blueprints for all cellular organisms.
Q582.Dry ice is ____?
Correct Answer: C
Dry ice is solid carbon dioxide (CO2). It is highly volatile and sublimates directly to gas at -78.5°C (-109.3°F).
Q583.Earth is divided into which three layers?
Correct Answer: D
Geologically, the Earth is stratified into three distinct layers: the outer Crust, the silicate Mantle, and the metallic Core.
Q584.Earth rotates on its axis in ____?
Correct Answer: A
A sidereal day (one true rotational cycle of Earth relative to fixed stars) is exactly 23 hours, 56 minutes, and 4.09 seconds.
Q585.Earthquake waves travel faster in ____?
Correct Answer: A
Among the options provided, longitudinal seismic P-waves travel much faster in water than in gaseous air or dry soil.
Q586.First antibiotic was extracted from a ____?
Correct Answer: C
Penicillin, the first antibiotic, was extracted in 1928 by Alexander Fleming from the Penicillium chrysogenum fungus.
Q587.First Atomic theory was proposed by ____?
Correct Answer: A
John Dalton proposed his atomic theory in 1803, stating that all matter is composed of tiny, indivisible particles called atoms.
Q588.First controlled fission of an atom was carried out in ____ in 1938.
Correct Answer: B
The first controlled nuclear fission of uranium was demonstrated in Berlin, Germany, by Otto Hahn and Fritz Strassmann.
Q589.Golden rice has the highest quantity of ____?
Correct Answer: A
Golden rice is genetically engineered to produce beta-carotene, a biochemical precursor of Vitamin A, to combat malnutrition.
Q590.Who was the first scientist to prove that Planets move around the sun?
Correct Answer: B
Using his newly improved optical telescope in the early 1600s, Galileo Galilei gathered observations confirming heliocentrism.
Q591.Highest Clouds are ____?
Correct Answer: D
High-altitude clouds (occurring above 20,000 feet) include Cirrus, Cirrocumulus, and Cirrostratus, which are composed of ice crystals.
Q592.In human embryo development, which body part develops first?
Correct Answer: A
The heart is the first functional organ to develop, beginning to beat and pump blood around day 21-22 of embryogenesis.
Q593.In what year did Galileo first use an optical telescope to study the moon?
Correct Answer: B
Galileo constructed his first telescope and initiated historical lunar astronomical observations in autumn 1609.
Q594.Lack of ____ causes diabetes?
Correct Answer: C
Insulin, a hormone produced by islet cells in the pancreas, is essential to regulate blood glucose. Lack of it causes Diabetes.
Q595.Largest Galaxy in the Universe is ____?
Correct Answer: C
The source identifies Spiral Galaxies (such as the giant spiral systems) as representing the largest class of regular galaxies.
Q596.Largest moon in our solar system is ____?
Correct Answer: B
Ganymede, a satellite of Jupiter, is the largest moon in the Solar System, possessing a diameter of 5,268 km (larger than Mercury).
Q597.Long-sight defect could be corrected by using ____ lens?
Correct Answer: B
Hyperopia (long-sightedness) is corrected using a convex or converging lens to redirect light rays to focus directly on the retina.
Q598.LPG consists mainly of ____?
Correct Answer: C
Liquefied Petroleum Gas (LPG) consists primarily of propane and butane hydrocarbon gases, with minor traces of methane.
Q599.The good sources of Vitamin-A are ____?
Correct Answer: A
Green leafy vegetables like spinach and carrots are rich in provitamin A carotenoids, which are vital for healthy vision.
Q600.The good sources of Vitamin-B Complex are ____?
Correct Answer: B
Whole grains, seeds, and nuts provide a rich spectrum of B vitamins required for cellular metabolism.