Option “C” is correct The chief ozone-depleting substances include chlorofluorocarbons (CFCs), carbon tetrachloride, hydrochlorofluorocarbons (HCFCs) and methyl chloroform.
163. Activated Charcoal is used to remove colouring matter from pure substances by_______.
Option “D” is correct Chernobyl disaster is the result of pollution by radioactive wastes. Which occurred on 26 April 1986 in Ukranian Soviet Socialist Republic which was part of Soviet Union.
165. Who had indirect role in the discovery of the atom bomb?
1. Madam Curie
2. Pierre Curie
3. Otto Hahn
4. Albert Einstein
Option “D” is correct Einstein’s greatest role in the invention of the atomic bomb was signing a letter to President Franklin Roosevelt urging that the bomb be built. The physicist Albert Einstein did not directly participate in the invention of the atomic bomb, he was instrumental in facilitating its development.
166. Major gaseous pollutant of the thermal power station is –
1. HSO3
2. NH3
3. NO2
4. SO2
Option “D” is correct Major gaseous pollutant of the thermal power station is SO2.
167. A substance which readily forms colloidal solution in contact with water is called –
Option “D” is correct The meaning of the word hydrophilic is water loving. Thus, a substance which readily forms colloidal solution in contact with water is called hydrophilic colloid.
168. Actinides are the elements with atomic numbers from-
1. 89 to 103
2. 101 to 115
3. 97 to 104
4. 36 from 43
Option “A” is correct The Actinide series contains elements with atomic numbers 89 to 103 and is the sixth group in the periodic table.
169. Who invented Neon Lamp?
1. Vint Cerf
2. David Chaum
3. Georges Claude
4. Josephine Cochrane
Option “C” is correct Georges Claude invented Neon Lamp.
170. Which of the following is the main end product of carbohydrate digestion?
1. Fats
2. Lipids
3. Glucose
4. Cellulose
Option “C” is correct End products of digestion of carbohydrates are Glucose, fructose and galactose.
