General Science - 11

157. Cathode rays are discovered by _______

Ans: Julius Plucker

158. Anode rays are discovered by ________

Ans: Gold Stein

159. The atomic number is first calculated by _______

Ans: Moseley

160. Neutron was discovered by ______

Ans: James Chadwick

161. The lightest metal is ________

Ans: Lithium

162. Electrum is an alloy of____________

Ans:Gold and Silver

163.In a dry cell _______&_________ act as electrodes

Ans: zinc, carbon

164.___________is the purest form of crystalline rock

Ans; Diamond

165.Rutile is the ore of ___________

Ans: Titanium

166. Galena is the ore of _____________

Ans:Lead

167.The most common halide by weight in earth crust is _______________

Ans : Flouride

168. Heaviest metal occurring in nature is______________.

Ans: Uranium

169._____________is the purest type of iron  that contains least amount of carbon.

Ans:Wrought Iron

170.When iron rests, its weight _______________

Ans: increases

171.The First Metal Used by man is_________________

Ans: Copper.
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