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Byju's Answer
Standard XII
Physics
Optical Fiber
Which of the ...
Question

Which of the following statements is best supported by this passage?

A
The value of a diamond is in large part dependent on the way it is prepared.
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B
The natural cleavage will determine the value of a diamond.
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C
Translucent and transparent diamonds are considered the most valuable.
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D
It is easy to retrieve diamonds from underground mines.
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Solution

The correct option is C Translucent and transparent diamonds are considered the most valuable.
Option A is incorrect because the given paragraph does not mention different ways of preparation which can change the value of the diamond.
Option B is incorrect because the paragraph says that natural cleavage is the line along which they can be split. There is no mention that the cleavage determines the value of the diamond.
Option C is correct because there is a line which mentioned - " A perfect cut and polished diamond will be (among other things) translucent and colourless.
Option D is incorrect because there is no mention in the paragraph about whether the process of retrieving diamond is tough or easy.

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Q. Summarize the following by paraphrasing:
To retrieve the diamonds, the earth is crushed and concentrated. The concentrated material is then sorted by passing it over streams of water on greased tables. Since diamonds are water repellent, they will stick to the grease while the other minerals will absorb water and pass over the grease. The diamonds are then removed from the grease and cleaned, examined, sorted and graded.
Q. The relationship between the cleavage and translucence of a diamond is comparable to the relationship between the style of a car and its ______.

Q. In a particular country, the value of a diamond is directly proportional to the surface area (exposed) of the diamond. Four thieves steal a cubical diamond piece and then divide equally into four parts. What is the maximum percentage increase in the value of diamond after cutting it?
Q.

Write 'true' or 'false' against the following statements :

(a) Carbon constitutes 0.03% of the earth's crust.

(b) Graphite is the purest form of carbon.

(c) Coloured diamonds are costlier than colourless and transparent diamonds.

(d) Graphite has layers of hexagonal carbon bondings.

(e) Diamond is insoluble in all solvents.

Q. Which of the following statements is/are incorrect for diamond?
(a) The refractive index of diamond is highest among solids.
(b) Diamond is hard because all the valence electrons of each carbon atom are involved in bond formation.
(c) Diamond is thermodynamically more stable than graphite.
(d) One carat of diamond represents its weight.
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