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24) Permanent hardness of water can be removed by adding Urft ey] earl} watear et sttsene qe Pear, , om anat &, , (A) Chlorine, , (B) Washing soda, , (C) Potassium permanganate, (D) Bleaching powder, , 25) Air is a/an AT t, (A) Compound, (B) Gas, (C) Mixture, (D) Element, 26) Number of years to build Tajmahal atrieet aart & fad ast Ay seat, (A) 22, (B) 26, (c) 18, (D) 12, 27) Khilafat movement was started on fWetthed slater ye feat war ur, (A) 1913, (B) 1919, (C) 1927, (D) 12929, 28) Who invented Dynamite SRAMHISc &l silat fared fear?, (A) Alfred Nobel, (8) Michael Faraday, (C) Isaac Newton, (D) Archimedes, 29) Father of the video games aifsat 4 & saa, (A) Fran Whittle, (B) Ralph Bear, (C) Charles Babbage, (D) Ray Tomlinson, 30) Who invented world wide web Gea aigz 4a an sneer fare far?, (A) Steve Jobs, (8) Tim Berners Lee, (C) Charles Babbage, (D) Ray Tomlinson