When was the first graphite racquet?

When was the first graphite racquet?
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Match the following: [IAS 1998] Minerals Mining area A: Graphite 1. Bellary B. Lead 2. Didwana C. Salt 3. Rampa D. Silver 4. Zawar A B C D (a) 3 4 1 2 (b) 1 4 2 3 (c) 3 1 4 2 (d) 2 3 1 4

Description : Match the following: [IAS 1998] Minerals Mining area A: Graphite 1. Bellary B. Lead 2. Didwana C. Salt 3. Rampa D. Silver 4. Zawar A B C D (a) 3 4 1 2 (b) 1 4 2 3 (c) 3 1 4 2 (d) 2 3 1 4

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The hardest natural substance is - (1) Diamond (2) Iron (3) Graphite (4) Copper

Description : The hardest natural substance is - (1) Diamond (2) Iron (3) Graphite (4) Copper

Last Answer : (1) Diamond Explanation: Diamond is the hardest naturally occurring substance found on Earth. It is due to the giant molecular structure of diamond in which each carbon atom is covalently bonded to four other carbon atoms

Which one of the following mixtures is homogeneous? (1) Starch and sugar (2) Methanol and water (3) Graphite and charcoal (4) Calcium carbonate and calcium bicarbonate

Description : Which one of the following mixtures is homogeneous? (1) Starch and sugar (2) Methanol and water (3) Graphite and charcoal (4) Calcium carbonate and calcium bicarbonate

Last Answer : (2) Methanol and water Explanation: A homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components throughout any given sample.

Graphite is used in nuclear reactors for- (1) reducing the speed of fast neutrons (2) cooling the reactor (3) absorbing neutrons (4) None of the above

Description : Graphite is used in nuclear reactors for- (1) reducing the speed of fast neutrons (2) cooling the reactor (3) absorbing neutrons (4) None of the above

Last Answer : (1) reducing the speed of fast neutrons Explanation: A graphite reactor is a nuclear reactor that uses carbon as a neutron moderator, which allows unenriched uranium to be used as nuclear fuel.

Which of the following is used as a moderator in nuclear reactors? (1) Thorium (2) Graphite (3) Ordinary water (4) Radium

Description : Which of the following is used as a moderator in nuclear reactors? (1) Thorium (2) Graphite (3) Ordinary water (4) Radium

Last Answer : (2) Graphite Explanation: Graphite is used a moderator in nuclear reactors.

Carbon occurs in nature in the purest form as - (1) Diamond (2) Graphite (3) Carbon black (4) Coal

Description : Carbon occurs in nature in the purest form as - (1) Diamond (2) Graphite (3) Carbon black (4) Coal

Last Answer : (1) Diamond Explanation: There are three forms of pure carbon: Graphite, Coal and Diamond. All three are made up of elemental carbon, caol is the least pure when found in nature. Diamond is the purest form of Carbon.

Which of the following is NOT malleable? (1) Graphite (2) Aluminium (3) Copper (4) Silver

Description : Which of the following is NOT malleable? (1) Graphite (2) Aluminium (3) Copper (4) Silver

Last Answer : (1) Graphite Explanation: Graphite is soft thanks to Van derWalls forces between to sheets of carbon atoms.

Which of the following is used as lubricant? (1) Graphite (2) Silica (3) Diamond (4) Iron Oxide

Description : Which of the following is used as lubricant? (1) Graphite (2) Silica (3) Diamond (4) Iron Oxide

Last Answer : (1) Graphite Explanation: Graphite is used as a lubricant due to its slippery nature. Due to its loosely intact carbon atoms or free electrons, they can move around easily from one place to another, making graphite a good conductor of electricity.

Which of the following is used as a coolant in nuclear reactors? (1) Heavy water (2) Cadmium (3) Liquid sodium (4) Graphite

Description : Which of the following is used as a coolant in nuclear reactors? (1) Heavy water (2) Cadmium (3) Liquid sodium (4) Graphite

Last Answer : (3) Liquid sodium Explanation: Liquid metallic sodium may be used as the sole coolant, carrying heat from the core. Sodium has only one stable isotope, sodium-23. Sodium-23 is a very weak absorber of neutrons.

As which one of the following, does carbon occur in its purest form in nature? (1) Carbon black (2) Graphite (3) Diamond (4) Coal

Description : As which one of the following, does carbon occur in its purest form in nature? (1) Carbon black (2) Graphite (3) Diamond (4) Coal

Last Answer : (3) Diamond Explanation: The purest form of carbon is neither diamond nor graphene or graphite . It is 'Fullerene' , the purest form of carbon.

In Nuclear reactors graphite is used as (1) Lubricant (2) Fuel (3) Linear of the reactor (4) Modulator

Description : In Nuclear reactors graphite is used as (1) Lubricant (2) Fuel (3) Linear of the reactor (4) Modulator

Last Answer : (4) Modulator Explanation: Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled.