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General Science
Play this  Quiz Game  On your phone 51 - Diamond, 52 - Vacuum tubes, 53 - Iron, 54 - 660.32 °C, 55 - Bauxite, 56 - Doping,   57 - Nitrogen, 58 - Nucleus, 59 - Copper and Tin, 60 - O3.

51. What is at No.10 in Mohs scale of mineral hardness?

           Diamond

           Quartz

           Corundum

           Topaz


52. What was the main part of the Atanasoff - Berry computer?

           Diodes

           Vacuum tubes

           Semiconductors

           Transistors


53. What is the most common metal found on Earth?

           Copper

           Nickel

           Zinc

           Iron


54. What is the melting point of aluminum?

           660.32 °C

           400.12 °C

           900.94 °C

           812.14 °C


55. What is the most important ore of aluminium?

           Pitchblende

           Hematite

           Bauxite

           Chalcopyrite


56. Adding impurities to a pure intrinsic semiconductor is called:

           Doping

           Annealing

           Strengthening

           Electrifying


57. The gas usually filled in the electric bulb is:

           Oxygen

           Nitrogen

           Helium

           Hydrogen


58. What is the centre of an atom called?

           Crust

           Nucleus

           Neutron

           Core


59. Bronze is a mixture of:

           Copper and Tin

           Nickel and Zinc

           Copper and Manganese

           Copper and Zinc


60. What is the chemical formula of Ozone?

           O6

           O2

           O3

           O