Which of the following is the hardest element? (a) Copper (b) Diamond (c) Iron (d) Silicon

Which of the following is the hardest element? (a) Copper (b) Diamond (c) Iron (d) Silicon
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The element I am thinking about has several interesting characteristics. It occupies the same column in the periodic table as lead. Resistors which are commonly found in electronic circuits are often made out of this element. In addition, in one of its forms, this element is one of the hardest substances on earth. What element am I thinking about?

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Last Answer : ANSWER: CARBON

Which of the following statements is not true about diamonds? (a) It is the purest form of carbon (b) It is the hardest naturally occurring substance (c) It is a good conductor of electricity (d) Artificial diamonds can be prepared by subjecting a solution of pure carbon in iron to very high pressures and temperatures

Description : Which of the following statements is not true about diamonds? (a) It is the purest form of carbon (b) It is the hardest naturally occurring substance (c) It is a good conductor of ... diamonds can be prepared by subjecting a solution of pure carbon in iron to very high pressures and temperatures

Last Answer : Ans:(c)

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

Last Answer : (4) Tungsten Explanation: Titanium is the hardest natural metal in the world. It is very strong, three times the strength of steel and much stronger than gold, silver and platinum and yet is very ... normal wear. Tungsten carbide is two times as hard as steel and four times as hard as titanium.

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

Last Answer : Tungsten

The heating element in an electric iron is made of (a) Nichrome (b) Tungsten (c) Copper (d) Iron

Description : The heating element in an electric iron is made of (a) Nichrome (b) Tungsten (c) Copper (d) Iron

Last Answer : Ans:(a)

The element used in an electric filament is (a) Copper (b) Aluminium (c) Iron (d) Tungsten

Description : The element used in an electric filament is (a) Copper (b) Aluminium (c) Iron (d) Tungsten

Last Answer : Ans:(d)

An electric iron has a heating element made of – (1) Copper (2) Tungsten (3) Nichrome (4) Zinc

Description : An electric iron has a heating element made of – (1) Copper (2) Tungsten (3) Nichrome (4) Zinc

Last Answer : (3) Nichrome Explanation: Nichrome is used in electric iron because it has high resistance and it is stable in air when hot. Nichrome wire forms a protective layer of chromium oxide. Chemically it is quite stable and does not combine with other atmospheric gases even in high temperature.

Cinnabar, pyrite and galena are minerals which consist of one or more metals combined with the same element. Which one of the following is the element that is common to all three of these minerals? Is it: w) iron x) copper y) sulfur z) sodium

Description : Cinnabar, pyrite and galena are minerals which consist of one or more metals combined with the same element. Which one of the following is the element that is common to all three of these minerals? Is it: w) iron x) copper y) sulfur z) sodium

Last Answer : ANSWER: C-- SULFUR

An electric iron has a heating element made of : (1) Copper (2) Tungsten (3) Nichrome (4) Zinc

Description : An electric iron has a heating element made of : (1) Copper (2) Tungsten (3) Nichrome (4) Zinc

Last Answer : Nichrome

Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Description : Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Last Answer : Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

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

Last Answer : Ans: (c)

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).

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

Duralumin is an alloy of (A) Aluminium, copper and manganese (B) Aluminium, nickel and silicon (C) Aluminium and nickel (D) None of these

Description : Duralumin is an alloy of (A) Aluminium, copper and manganese (B) Aluminium, nickel and silicon (C) Aluminium and nickel (D) None of these

Last Answer : (A) Aluminium, copper and manganese

Addition of __________ to steel does not impart hardness. (A) Nickel (B) Copper (C) Chromium (D) Silicon

Description : Addition of __________ to steel does not impart hardness. (A) Nickel (B) Copper (C) Chromium (D) Silicon

Last Answer : : Option B