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. What do we call the ratio of number of fission produced by a given generation of neutrons to the number of fission of the preceding generation?

[A] Critical factor
[B] Energy factor
[C] Multiplication factor
[D] Moderation factor

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42. Which of the following material is used to make control rods in a nuclear reactor?

[A] Indium
[B] Boron
[C] Cadmium
[D] All of the above

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43. Which of the following is emitted in alpha decay?

[A] Helium nucleus
[B] Hydrogen nucleus
[C] Electrons
[D] Carbon nucleus

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44. Which of the following reactions take place when iron nail in a copper sulphate solution becomes brownish in colour?

[A] Decomposition reaction
[B] Displacement reaction
[C] Double Displacement reaction
[D] None of the above

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45. Which of these methods can be used to prevent rancidity?

[A] Adding antioxidants to the food
[B] Storing food at low temperature
[C] Replace the air with nitrogen in the packing material
[D] All of the above

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46. What is the sum of powers of the concentration of the reactants called as?

[A] Order of reaction
[B] Stage of reaction
[C] Zone of reaction
[D] None of the above

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47. What is the relationship between half-life period and initial concentration of the reacting species for a first order reaction?

[A] Both are directly proportional to each other
[B] Both are inversely proportional to each other
[C] Both are independent of each other
[D] The half life is twice the concentration of reacting species

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48. Who gave the law of octaves for arrangement of elements?

[A] Lothar Meyer
[B] Dmitri Mendeleev
[C] John Alexander Newlands
[D] Johann Dobereiner

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49. From which element in the modern periodic table, the 3d transition series starts?

[A] Zinc
[B] Iron
[C] Scandium
[D] Copper

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50. The Lanthanoids are part of which of the following block of elements in the periodic table?

[A] p-block
[B] s-block
[C] d-block
[D] f-block

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