171. The PH of acid rain is less than?
(a) 13.6
(b) 10.6
(c) 7.6
d) 5.6
172. The coldest region in the atmosphere is?
(a) Troposphere
(b) Mesosphere
(b) Stratosphere
(d) Thermosphere
173. Ozone is formed in the presence of ultraviolet radiations from?
(a) O and O
(b) 02 and 02
(b) 02 and O
(d) 02 and 03
174. The gas (es) which is/are responsible for acid rain is/are?
(a) SO2
(b) CO2
(b) NO2
(d) All S02, NO2 and CO2
175. The number of based on temperature variation. What are atmospheric regions?
(b) Two
(c) three
(d) five
176. What gas shields the surface of the planet from ultraviolet rays?
(a) CO2
(b) N2
(c) 03
(d) 02
177. Lowest temperature in troposphere is’?
(a) 5C
(b) -5C
(c) 56C
d)-56C
178. Water has the ability to dissolve non compounds due to?
(a) lonic forces
(b) Ionic-dipole forces
(b) dipole-dipole forces
(d) Hydrogen bonding
179. All salts because the water become hard EXCEPT?
(a) Calcium chloride
(b) Magnesium sulpahte
(b) Calcium bicarbonate
(d) Sodium chloride
180. The salt which causes temporary hardness in water is?
(a) Magnesium sulpahate
(6) Magnesium chloride
(b) Calcium chloride
(d) Calcium bicarbonate
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