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
41. Which of the following alkene shows structural isomerism?
[A] Ethene
[B] Propene
[C] Butene
[D] All of the above
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Correct Answer: C [Butene]
Notes:
Ethene and propene can have only one structure but alkenes higher than propene have different structures. For example: But-1-ene and But-2- ene.
42. Which of the following hydrocarbon is the source of Natural rubber?
[A] isoprene
[B] Benzene
[C] Butene
[D] Methanol
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Correct Answer: A [isoprene]
Notes:
Natural Rubber is a polymer of unsaturated hydrocarbon, 2-methyl-1, 3-butadiene also called as isoprene. It is obtained from the latex of rubber trees found in tropical and semi-tropical countries.
43. What is the monomer unit of Teflon?
[A] Acetylene
[B] terafluoroethylene
[C] neoprene
[D] Propylene
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Correct Answer: B [terafluoroethylene]
Notes:
The monomer unit of Teflon is terafluoroethylene molecule. Teflon is prepared by heating tetra fluoroethylene under pressure in the presence of ammonium peroxosulphate.
44. What do we call the polymer which is formed from more than one kind of monomer?
[A] Homopolymer
[B] Copolymer
[C] Megapolymer
[D] Heteropolymer
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Correct Answer: B [Copolymer]
Notes:
A polymer formed from more than one kind of monomer units is called copolymer or mixed polymer. A polymer formed from only one kind of monomers is called homopolymer.
45. Which of these is an example of a homopolymer?
[A] Polyethene
[B] Buna-S rubber
[C] Styrene
[D] All of the above
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Correct Answer: A [Polyethene]
Notes:
A polymer formed from only one kind of monomers is called homopolymer. Polyethene –(– CH2– CH2 –)–n is an example of homopolymer.
46. Which of these is not a natural polymer?
[A] Starch
[B] cellulose
[C] Proteins
[D] Bakelite
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Correct Answer: D [Bakelite]
Notes:
The polymers obtained from nature (plants and animals) are called natural polymers. Starch, cellulose, natural rubber, proteins, etc. are some examples. Bakelite is an example of synthetic polymer.
47. Which of these is not a Linear polymer?
[A] Starch
[B] Polyethelene
[C] Nylons
[D] Polyesters
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Correct Answer: A [Starch]
Notes:
The polymers in which monomeric units are linked together to form linear chains are known as a linear polymer. Examples are polyethelene, nylons and polyesters.
48. Which of these metals will not melt when kept in palm?
[A] Gallium
[B] Caesium
[C] Zirconium
[D] All of the above
Show Answer
Correct Answer: C [Zirconium]
Notes:
Unlike other metals, gallium and caesium have very low melting points. These two metals will melt if you keep them on your palm.
49. Which of the following metals is the major constituent of Pewter alloy?
[A] Tin
[B] Indium
[C] Titanium
[D] Lead
Show Answer
Correct Answer: A [Tin]
Notes:
Tin is the major constituent of Pewter alloy. It is traditionally composed of 85–99% tin, mixed with copper, antimony, bismuth.
50. Which is the most abundant metal in the Earth’s crust?
[A] Iron
[B] Aluminium
[C] Copper
[D] Silicon
Show Answer
Correct Answer: B [Aluminium]
Notes:
Aluminium is the most abundant metal in the Earth’s crust. It makes up about 8% of the Earth’s crust. Aluminium is the third most abundant element after oxygen and silicon.
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