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 is correct about the properties of a solution?

[A] The particles of a solution can be seen by naked eyes
[B] The particles of a solution scatter a beam of light passing through the solution
[C] The solute particles do not settle down when left undisturbed
[D] All of the above

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42. Which of these methods is suitable to obtain the coloured component from black ink?

[A] Evaporation
[B] Sublimation
[C] Crystallisation
[D] All of the above

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43. Which of the following is correct about Solder?

[A] It is an alloy of lead and tin
[B] It is used for welding electrical wires together
[C] It has a low melting point
[D] All of the above

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44. What are the constituents of German Silver alloy?

[A] Gold, Aluminium and Copper
[B] Zinc, iron and Silver
[C] Bismuth, Antimony and Tin
[D] Copper, Nickel and Zinc

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45. Which of the following is the correct order of the decreasing order of abundance of the elements in earth’s crust?

[A] Iron > Silicon > Oxygen >Aluminium
[B] Oxygen > Silicon > Aluminium > Iron
[C] Oxygen> Iron > Aluminium > Silicon
[D] Iron > Aluminium > Silicon > Oxygen

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46. Hydraulic Washing:

  1. is used for concentration of ores
  2. is based on differences in magnetic properties of the ore components

Which of the above is / are correct?

[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2

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47. Which of the following is the purest form of Iron?

[A] Pig iron
[B] Cast iron
[C] Wrought iron
[D] None of the above

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48. Which of these is an ore of Aluminium?

[A] Corundum
[B] Kieserite
[C] Pitch blende
[D] All of the above

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49. Which of the following refining methods works on the principle that impurities are more soluble in the melt than in the solid state of the metal?

[A] Liquation
[B] Electrolytic refining
[C] Zone refining
[D] Vapour Phase refining

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50. Which of the following characteristic of an electron is impossible to determine simultaneously, as per Heisenberg’s Uncertainty Principle?

[A] exact charge and exact velocity
[B] exact charge and exact mass
[C] exact position and exact momentum
[D] exact mass and exact position

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