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Sunday 10 January 2016

General Science Chemistry- 10

151. Who discovered positrons?
Answer: Carl David Anderson

152. What is the unit for measuring the pitch or frequency of sound ?
Answer: Decible

153. Who measured the charge of an electron at first?
Answer: Robert Andrews Millikan

154. The metal used in storage batteries —
Answer: Lead

155. The fastest acting enzyme in the biological kingdom is–
Answer: carbonic anhydrase

156. Water has maximum density at —
Answer: –4°C

157. Lightening cause rainfall because–
Answer:  It activate H2O molecule

158.Which one of the following is also called Stranger Gas?
Answer: Xenon

159. The chemial name of Uria is —
Answer: Carbamide

160. Nitrification means–
Answer: Convert the atmospheric nitrogen to effective nitrogen compound.

161. Permanent hardness of water can be removed by adding —
Answer: Washing Soda

162.The alcohol used in power alcohol is
Answer: ethyl alcohol

163. Cell membrane is–
 Answer:  semipermeable

164.The chemical used as a fixer in photography is
Answer: sodium thiosulphate

165. Which of the following substance is a bad conductor of electricity but a good conductor of heat?
Answer: Mica

166. Polythene is industrially prepared by the polymerisation of–
Answer: ethylene

167.The shell of the egg is made of –
Calcium Carbonate.

168.Talc is basic –
magnesium silicate mineral

169.The highest and simplest element is hydrojen while the lightest metal is-
Lithium

170. Temporary hardness of water is due to the bicarbonates of calcium and magnesium. It can be removed by –
boiling or adding lime
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