| 111. | Which method is used to vulcanize natural rubber? |
A. heating with sulfur | |
B. heating with carbon black | |
C. adding chlorine gas | |
D. add diphenimyl |
| 112. | Which of the following reacts to produce urea? |
A. ammonium dioxide + calcium sulfate | |
B. carbon dioxide + ammonia | |
C. acetic acid + ammonia | |
D. methane + carbon monoxide |
| 113. | The sweet taste of fruits is due to |
A. ribose | |
B. lactose | |
C. fructose | |
D. Maltose |
| 114. | carbohydrates are compounds of |
A. carbon and hydrogen | |
B. carbon, oxygen and hydrogen | |
C. carbon, nitrogen and hydrogen | |
D. carbon and nitrogen |
| 115. | What is obtained when chlorine is added to ethylene? |
A. ethyldi chloride | |
B. ethylene chlorohydrin | |
C. ethyl chloride | |
D. ethylene chloride |
| 116. | Which one of the following is not an Explosive? |
A. nitrochloroform | |
B. T.N. Yes. | |
C. T.N. Tea. | |
D. potassium chlorate |
| 117. | Which of the following explosives is named ‘Nobel Oil’? |
A. tng | |
B. tnp | |
C. TNA | |
D. TNT |
| 118. | The handle of pressure cookers is made of plastic, because it should be made a bad conductor of heat. Which plastic is used in it, which is the first man-made plastic? |
A. polyethylene | |
B. terrylene | |
C. Nylon | |
D. bakelite |
| 119. | What happens when ethylene dibromide is mixed with petrol? |
A. It increases the octane number of the fuel | |
B. It is helpful in lead oxide elimination | |
C. It removes sulfur compounds from petrol | |
D. It acts as a replacement for tetraethyl lead |
| 120. | Which of the following is not a natural polymer? |
A. the heat | |
B. Leather | |
C. nylon | |
D. silk |