Which of the following is the hardest substance? A. Copper B. Diamond (Answer) C. Iron D. Silicon

Which of the following is the hardest substance?

A. Copper

B. Diamond (Answer)

C. Iron

D. Silicon
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1 Answer

Answer :

B. Diamond (Answer)
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Description : Q: Which is the hardest naturally occurring substance on the Earth? -General Knowledge

Last Answer : Diamond is the ans

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Description : What is the hardest substance found in nature? -General Knowledge

Last Answer : While diamonds may be the hardest naturally occurring substance found on earth, he explains, they are not the hardest available (there are two harder substances - a laboratory synthetic nanomaterial called wurtzite boron nitride and a substance found in meteorites called lonsdaleite)

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Last Answer : answer:

What is the hardest substance found in nature? -General Knowledge

Description : What is the hardest substance found in nature? -General Knowledge

Last Answer : Its Diamond! A form of Carbon!

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Description : What is the hardest substance in the world ?

Last Answer : Diamond is the hardest substance in the world.

Which is the hardest substance in nature ?

Description : Which is the hardest substance in nature ?

Last Answer : Diamond is the hardest substance in nature.

Which is the hardest natural substance found on earth?

Description : Which is the hardest natural substance found on earth?

Last Answer : Answer: Diamond

Which is the hardest substance in the human body?

Description : Which is the hardest substance in the human body?

Last Answer : Tooth enamel

Which of the following is the hardest substance in the human body? (1) Bone (2) Enamel (3) Dentine (4) Nail

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Tooth enamel is the hardest substance found in the human body. What is it made up of - (1) Calcium carbonate (2) Limestone (3) Calcium phosphate (4) Calcium fluoride

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Which of the following is the hardest metal? (1) Gold (2) Iron (3) Platinum (4) Tungstain

Description : Which of the following is the hardest metal? (1) Gold (2) Iron (3) Platinum (4) Tungstain

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Among the following the hardest metal is – (1) Gold (2) Iron (3) Platinum (4) Tungsten

Description : Among the following the hardest metal is – (1) Gold (2) Iron (3) Platinum (4) Tungsten

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Among the following the hardest metal is (1) Gold (2) Iron (3) Platinum (4) Tungsten

Description : Among the following the hardest metal is (1) Gold (2) Iron (3) Platinum (4) Tungsten

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The substance which conducts current in the solid state is – (1) diamond (2) graphite (3) iodine (4) sodium chloride

Description : The substance which conducts current in the solid state is – (1) diamond (2) graphite (3) iodine (4) sodium chloride

Last Answer : (2) graphite Explanation: The structure of graphite is unlike most other network substances. It is formed in 'sheets' of carbon atoms, each of which is bonded to only three others. The ... electric charges. Unlike diamond (another carbon allotrope), graphite is an electrical conductor, a. semimetal.

The substance which conducts current in the solid state is (1) diamond (2) graphite (3) iodine (4) sodium chloride

Description : The substance which conducts current in the solid state is (1) diamond (2) graphite (3) iodine (4) sodium chloride

Last Answer : graphite

Match the following: [IAS 2007] Mineral Place A. Mica 1. Chindwara B. Diamond 2. Bellary C. Manganese 3. Panna D. Copper 4. Hazaribagh A B C D (a) 1 2 3 4 (b) 1 3 2 4 (c) 4 3 2 1 (d) 4 2 3 1

Description : Match the following: [IAS 2007] Mineral Place A. Mica 1. Chindwara B. Diamond 2. Bellary C. Manganese 3. Panna D. Copper 4. Hazaribagh A B C D (a) 1 2 3 4 (b) 1 3 2 4 (c) 4 3 2 1 (d) 4 2 3 1

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Give Reason : The energy required to vaporize one mol of copper is smaller than that of energy required to vaporize 1 mol of diamond.

Description : Give Reason : The energy required to vaporize one mol of copper is smaller than that of energy required to vaporize 1 mol of diamond.

Last Answer : Copper is a metallic solid having metallic bonds while diamond is a covalent solid having covalent bonds. Metallic bonds are weaker than covalent bonds and thus less amount of energy is required to break metallic bonds than covalent bonds.

For which of the following substances, the resistance decreases with increase in temperature? (1) Pure silicon (2) Copper (3) Nichrome (4) Platinum

Description : For which of the following substances, the resistance decreases with increase in temperature? (1) Pure silicon (2) Copper (3) Nichrome (4) Platinum

Last Answer : (3) Nichrome Explanation: Nichrome has high resistance and it is called a resistor.

The material used in the fabrication of a transistor is – (1) Aluminium (2) Copper (3) Silicon (4) Silver

Description : The material used in the fabrication of a transistor is – (1) Aluminium (2) Copper (3) Silicon (4) Silver

Last Answer : (3) Silicon Explanation: A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. The first transistors were made from germanium (Ge). ... compound semiconductor material gallium arsenide (GaAs) and the semiconductor alloy silicon germanium (SiGe).

Necessary element of change in solar energy to electric energy – (1) Berilliurn (2) Silicon (3) Tantelum (4) Pure Copper

Description : Necessary element of change in solar energy to electric energy – (1) Berilliurn (2) Silicon (3) Tantelum (4) Pure Copper

Last Answer : (2) Silicon Explanation: A small solar electric or photovoltaic (PV) converts solar energy into electrical energy. Solar cells consist of semiconductor materials which work on photoelectric effect. Silicon remains the most popular material for solar cells.

Which of the listed pairs of materials make the best insulators? A. copper and aluminum B. glass and mica C. dry air and a vacuum D. doped silicon and germanium

Description : Which of the listed pairs of materials make the best insulators? A. copper and aluminum B. glass and mica C. dry air and a vacuum D. doped silicon and germanium

Last Answer : Answer: B