231. Which of the following is commonly called a polyamide ?
A. Rayon
B. Nylon
C. Terylene
D. Orion

232. Which of the following is not a chemical reaction ?
A. Burning of coal
B. Conversion of water into steam
C. Digestion of food
D. Burning of paper

233. Which of the following is used in beauty parlours for hair setting?
A. Silicon
B. Chlorine
C. Sulphur
D. Phosphorus

234. Which one of the following is not a radioactive element ?
A. Cadmium
B. Thorium
C. Radium
D. Uranium

235. Which of the following is the world’s loudest bird ?
A. White bellbird
B. Peacock
C. Piha
D. None of the above

236. Which one of the following non-metals is not a poor conductor of electricity?
A. Sulphur
B. Selenium
C. Bromine
D. Phosphorus

237. Eletromagneticism is the branch of___________?
A. Chemistry
B. Physics
C. Both
D. None of these

238. Second name of ethyl alcohol is___________?
A. Ethene
B. Ethanol
C. Propyle
D. none

239. Transistor is a device that convert weak signal into__________?
A. small signal
B. strong signal
C. both
D. none

240. Dioptre is a unit of measurement for __________ ?
A. Current
B. Lens
C. Force
D. Focal Length

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