38500+ Important MCQs for AFCAT

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Learn AFCAT MCQs with answers [Page 17 of Department 103]

C

Chandan Das • 6.78K Points
Tutor III Physics

161) Diamonds are glittering and attractive because light incident on them undergoes

  • (A) Highest refraction
  • (B) Multiple internal reflections
  • (C) Multiple surface reflections
  • (D) Hundred percent transmission
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Correct Answer - Option (B)

Explanation :

Diamond has remarkable optical characteristics. Because of its extremely rigid lattice, it can be contaminated by very few types of impurities, such as boron and nitrogen. Combined with wide transparency, this results in the clear, colourless appearance of most natural diamonds. Small amounts of defects or impurities (about one per million of lattice atoms) colour diamond blue (boron), yellow (nitrogen), brown (lattice defects), green (radiation exposure), purple, pink, orange or red. Diamond also has relatively high optical dispersion (ability to disperse light of different colours), which results in its characteristic luster. Excellent optical and mechanical properties, combined with efficient marketing, make diamond the most popular gemstone.

C

Chandan Das • 6.78K Points
Tutor III Chemistry

163) Diamond is harder than graphite because of :

  • (A) Difference in layers of atoms
  • (B) Tetrahedral structure of diamond
  • (C) Difference of crystalline structures
  • (D) None of these
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Correct Answer - Option (A)

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C

Chandan Das • 6.78K Points
Tutor III Chemistry

167) Hardest allotrope of carbon is

  • (A) Diamond
  • (B) Graphite
  • (C) Coke
  • (D) Lamp black
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Correct Answer - Option (A)

Explanation :

Diamond is a well known allotrope of carbon. The hardness and high dispersion of light of diamond make it useful for both industrial applications and jewelry. Diamond is the hardest known natural mineral.

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