General Science Chemistry MCQs
Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination
71. Which of the following metal finds its use as a radiocontrast agent in X-ray imaging?
[A] Scandium
[B] Lithium
[C] Barium
[D] Titanium
Show Answer
Correct Answer: C [Barium]
Notes:
Barium sulfate is used as a radiocontrast agent in X-ray imaging of the digestive system. It increases the contrast of medical X-rays of the digestive system.
72. Which of these metals is commonly used in tanning of leather?
[A] Phosphorous
[B] Indium
[C] Manganese
[D] Chromium
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Correct Answer: D [Chromium]
Notes:
Chromium(III) salts are used in the tanning of leather. Chromium is a steely-grey, lustrous, hard and brittle transition metal which is also used as an additive in stainless steel.
73. Which of these metals is most commonly used as control rods in the nuclear reactors?
[A] Platinum
[B] Cadmium
[C] Cobalt
[D] Silver
Show Answer
Correct Answer: B [Cadmium]
Notes:
Cadmium is most commonly used as control rods in the nuclear reactors. Cadmium absorbs neutrons in the reactors, preventing them from creating additional fission events.
74. Which of these non-metals is liquid at room temperature?
[A] Helium
[B] Argon
[C] Bromine
[D] Sulphur
Show Answer
Correct Answer: C [ Bromine ]
Notes:
Among all the non-metals, Bromine exists in the liquid state at room temperature. All the other non-metals are either solids or gases in nature.
75. Which of these non-metals is commonly used as a general anesthetic?
[A] Helium
[B] Tellurium
[C] Xenon
[D] Fluorine
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Correct Answer: C [ Xenon ]
Notes:
Xenon is commonly used in medical science as a general anesthetic. It is a colorless, dense, odorless noble gas found in the Earth’s atmosphere.
76. Which of the following is the method to get rid of temporary hardness of water?
[A] Boiling the water
[B] Addition of calcium hydroxide
[C] Both a and b
[D] None
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Correct Answer: C [Both a and b]
Notes:
The temporary hardness of water can be reduced either by boiling the water, or by the addition of lime (calcium hydroxide) through the process of lime softening.
77. How are the soaps that float in water prepared?
[A] By adding a gum called as rosin
[B] By beating tiny air bubbles
[C] By dissolving soap in ethanol
[D] None of the above
Show Answer
Correct Answer: B [By beating tiny air bubbles]
Notes:
Soaps that float in water are made by beating tiny air bubbles before their hardening. Transparent soaps are made by dissolving the soap in ethanol and then evaporating the excess solvent.
78. Which of these drugs help to reduce or abolish pain without causing impairment of consciousness?
[A] Analgesics
[B] Antibiotics
[C] Tranquilisers
[D] Antiseptics
Show Answer
Correct Answer: A [ Analgesics]
Notes:
Analgesics reduce or abolish pain without causing impairment of consciousness, mental confusion, in coordination or paralysis or some other disturbances of nervous system.
79. Which of these drugs is called as the ‘love drug’?
[A] Mescalin
[B] MDMA
[C] Dextromethorphan
[D] Ketamine
Show Answer
Correct Answer: B [ MDMA]
Notes:
MDMA or 3,4-methylenedioxy-methamphetamine is a synthetic drug that alters mood and perception (awareness of surrounding objects and conditions). It is called as the love drug when used recreationally.
80. What is the nature of Drinking soda?
[A] Alkaline
[B] Acidic
[C] Neutral
[D] Oxidant
Show Answer
Correct Answer: B [Acidic]
Notes:
Drinking soda is acidic in nature. Cherry coke was found to be the next most acidic (pH of 2.522), and Coke was the third most acidic soda tested (pH of 2.525). The type of acid in the soda, level of soda and calcium content are also factors. Citric acid is the most erosive acid found in soft drinks and is the predominant acid in non-cola drinks.
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