General Science - Chemistry MCQs
1. Lysergic acid diethylamide (LSD) is a drug used as a :
[A] Steroid
[B] Sedative
[C] Analgesic
[D] Hallucinogen
Show Answer
Correct Answer: D [Hallucinogen]
2. Which of the following substances undergo ‘sublimation’ on heating
1.Iodine
2.Napthalene
3.Camphor
[A] 1 and 2
[B] 1 and 3
[C] 2 and 3
[D] All of them
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Correct Answer: D [All of them]
3. Amalgam’ is a term used for an alloy of a metal with :
[A] Copper
[B] Mercury
[C] Lead
[D] Aluminium
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Correct Answer: B [Mercury]
4. Gammaxene, D.D.T. and Bleaching powder are important compounds of :
[A] Chlorine
[B] Nitrogen
[C] Sulphur
[D] Phosphorus
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Correct Answer: A [Chlorine]
5. L.P.G. is a hydrocarbon consisting of a mixture of :
[A] Methane and Butane
[B] Propane and Butane
[C] Ethane and Propane
[D] Ethane and Butane
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Correct Answer: B [Propane and Butane]
6. What is Kerogen oil?
[A] Its an unconventional oil produced from the pyrolysis, hydrogenation, or thermal dissolution of Oil Shales
[B] Its a light crude oil contained in petroleum-bearing formations of shales
[C] Its an unconventional oil produced from the pyrolysis, hydrogenation, or thermal dissolution of environmental wastes
[D] It’s a new form of vegetable oil prepared artificially in laboratory
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Correct Answer: A [Its an unconventional oil produced from the pyrolysis, hydrogenation, or thermal dissolution of Oil Shales]
7. Which among the following was first human-made plastic?
[A] Bakelite
[B] Polyethene
[C] Celluloid
[D] Nylon
Show Answer
Correct Answer: C [Celluloid]
Notes:
he first human-made plastic was made by Alexander Parkes in 1855, when he synthesized celluloid. The new discovery found its use in photographic films, but it could not be used for making containers or insulators for electric circuits.
The first true plastic was made in 1909 by Leo Baekeland, who synthesized Bakelite. The hard plastic could be used to make handles, auto parts, etc. The First World War witnessed improvements in the manufacture of polystyrene and polyvinyl chloride, which found use in plumbing equipment and electric wire insulation. Nylon was synthesized in the 1930s. By 1950, plastics became quite popular and as a result we can see them everywhere today
8. Which among the following is the correct impact of the London Forces in the Cycloalkanes?
[A] The melting and boiling points get increased
[B] The Melting and boiling points get decreased
[C] There is not impact on the melting and boiling points
[D] The melting point increases but boiling point decreases
Show Answer
Correct Answer: A [The melting and boiling points get increased]
Notes:
Please note that the Cycloalkanes with more than 20 carbon atoms are called Cycloparaffins. The cycloalkanes have the same properties as the alkanes but they have `Higher Boiling & Melting points`. This is because of the stronger dispersion forces between the atoms known as London Forces.
9. Gargling with a solution of table salt is known to provide relief for a sore throat because ____ ?
[A] It kills bacteria
[B] It works as analgesic
[C] It dehydrates water from inflammatory tissues by Osmosis
[D] Placebo effect
Show Answer
Correct Answer: C [It dehydrates water from inflammatory tissues by Osmosis]
10. The Potassium graphite and Calcium Graphite can be mostly used as which among the following?
[A] Moderators
[B] Semiconductors
[C] Superconductors
[D] Lubricants
Show Answer
Correct Answer: C [Superconductors]
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