General MCQs
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Q161.Dental mirror is what type of mirror?
Correct Answer: B
Dentists use concave mirrors because they produce a magnified, upright virtual image of the teeth when held close.
Q162.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.
Q163.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.
Q164.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.
Q165.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.
Q166.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.
Q167.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.
Q168.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.
Q169.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.
Q170.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.
Q171.LPG consists mainly of ____?
Correct Answer: C
Liquefied Petroleum Gas (LPG) consists primarily of propane and butane hydrocarbon gases, with minor traces of methane.
Q172.The Kuiper belt and Oort cloud were first proposed by ____?
Correct Answer: B
Jan Oort proposed the Oort cloud in 1950, while the Kuiper belt was modeled independently by astronomers including Gerard Kuiper.
Q173.The largest latitude circle on earth is ____?
Correct Answer: D
The Equator represents the great circle of Earth's latitude (0°), where the planet's circumference is maximum.
Q174.The largest part of the human brain is ____?
Correct Answer: C
The cerebrum makes up about 85% of the human brain's weight and controls higher cognitive functions, memory, and voluntary movement.
Q175.The main Constituent of Biogas is ____?
Correct Answer: A
Methane (CH4) makes up 50% to 75% of biogas, which is produced by the anaerobic digestion of organic matter.
Q176.What is the largest artificial object in space?
Correct Answer: A
The International Space Station (ISS) is the largest space habitat ever constructed, measuring over 100 meters long.
Q177.What is the largest flower in the world?
Correct Answer: C
Rafflesia arnoldii, native to rainforests of Sumatra and Borneo, grows individual blooms up to 3 feet across.
Q178.Which of the following has the highest melting point?
Correct Answer: B
Tungsten has an exceptionally high melting point of 3,422°C (6,192°F), the highest of any stable metallic element.
Q179.Which of the following has the highest energy?
Correct Answer: A
Gamma rays are positioned at the extreme high-frequency end of the EM spectrum, giving them the highest photon energy.
Q180.Which of the following has the largest wavelength?
Correct Answer: C
Among the options, infrared light has the longest wavelength, situated between visible red light and microwaves.