The Hardest substance available on Earth is

A Diamond
B Wurtzite
C Platinum
D Gold

Correct Answer: Diamond

Diamond is the hardest substance available on Earth.

 

Diamond is the hardest substance available on Earth due to the giant molecular structure of diamond in which each carbon atom is covalently bonded to four other carbon atoms. A covalent bond is very strong and requires a large amount of energy to break itself, and diamond has many covalent bonds.

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Related Questions

পৃথিবী পৃষ্ঠে একটি ইটের ওজন 81 N. পৃথিবীর অর্ধেক বাসার্ধের সমান উচ্চতায় এবং অর্ধেক বাসার্ধের সমান গভীরতায় ইউটির উপরে পৃথিবীর অভিকর্ষ বলের মান কত হবে?(A brick weighs 81 N on the surface of the earth. What are the earth's gravitational forces act on it at a height of half of the radius of the earth and at a depth of half of the radius of earth, respectively?)
A 36 N and 81 N
B 36 N and 40.5 N
C 36 N and 20.25 N
D 98 and 40.5 N
E 81 N and 81 N
Answer the question on the basis of the given information. Businesses are suffering because of lack of money available for development loans.To help businesses,the government plans to modify the income- tax structure in order to induce individual tax payers to put a larger portion of their incomes into retirement savings accounts, because as more money is deposited in such accounts, more money becomes available to borrowers. Which of the following, if true, raises the most serious doubt regarding the effectiveness of the government's plan to increase the amount of money available for development loans for businesses?
A When levels of personal retirement saving increase, consumer borrowing always increases correspondingly.
B The increased tax revenue the government would receive as a result of business expansion would not offset the loss in revenue from personal income taxes during the first year of the plan.
C Even With tax incentives,some people will choose not to increase their levels of retirement savings .
D Bankers generally will not continue to lend money to Businesses whose prospective earnings are insufficient to meet their loan repayment schedules.
which of the following is the hardest element?
A Iron
B Diamond
C Copper
D Silicon
Which of the following is the hardest rock?
A Granite
B Coal
C Chalk
D Diamond
Which of the following is the hardest?
A Austenite
B Pearlite
C Bainite
D Martensite
The hardest form of carbon is
A coke
B graphite
C diamond
D charcoal
Hardest allotrope of carbon is
A Diamond
B Graphite
C Coke
D Lamp black
__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
A Beryllia
B Zirconia
C Alumina
D Magnesia
Hardest material so far found is
A Diamond
B Graphite
C Carborundum
D Pumice stone
Among the following the hardest metal is
A Gold
B Iron
C Platinum
D Tungsten

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