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

51. Which of the following is emitted in Beta-decay process?

[A] Electron
[B] Positron
[C] Both a and b
[D] None

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52. When is the gamma ray emitted?

[A] When a nucleus in a ground state goes to the excited state
[B] When a nucleus in an excited state spontaneously decays to its ground state
[C] When alpha rays and beta rays collide
[D] None of the above

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53. Which of the following substance was used as a moderator in CIRUS reactor?

[A] Heavy water
[B] water
[C] solid graphite
[D] No moderator was used

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54. 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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55. Which of the following is an endothermic reaction?

[A] Decomposition of calcium carbonate to calcium oxide and carbon dioxide
[B] Respiration
[C] Burning of Natural gas
[D] All of the above

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56. 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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57. Which of the following group of elements contain the noble gases?

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

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58. Which is the first element in the Actinoid series?

[A] Actinium
[B] Bohrium
[C] Mendelevium
[D] Nobelium

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59. Choose the correct statement:

[A] Water exists as liquid due to hydrogen bonding
[B] Hydrogen bond is a weak bond as compared to ionic bond
[C] Both a and b
[D] None of the above

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60. Which of the following acids is produced by stomach in human body to help in digestion?

[A] Hydrochloric acid
[B] Sulphuric acid
[C] Nitric acid
[D] Benzoic acid

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