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