Non-metals and their compounds

31.	Positive rod of dry cell is
	A. of copper
	B. of graphite
	C. of zinc
	D. of brass Option”B” is correct

32.	Which of the following is a good lubricant?
	A. diamond powder
	B. graphite powder
	C. molten carbon
	D. alloy of carbon and iron Option”B” is correct

33.	The moderator used in a nuclear reactor is –
	A. sea water
	B. graphite powder
	C. uranium
	D. radium Option”B” is correct

34.	What is determined by radio carbon dating
	A. of human age
	B. age of earth
	C. stony age
	D. fossil age Option”D” is correct

35.	Used for decolorizing raw sugar
	A. wood charcoal
	B. sugar charcoal
	C. animal charcoal
	D. coconut charcoal Option”C” is correct

36.	Blood is obtained by passing water vapor over hot carbon.
	A. water gas
	B. producer gas
	C. LPG
	D. CNG Option”A” is correct

37.	The element in which catenation properties are most visible –
	A. c
	B. Si
	C. Ge
	D. Pb Option”A” is correct

38.	The use of diamond as a jewel depends on its properties
	A. high value
	B. refractive index
	C. extreme hardness
	D. malconductivity Option”B” is correct

39.	Which of the following is another name for carborundum?
	A. calcium carbide
	B. calcium oxide
	C. silicon carbide
	D. silicon oxide Option”C” is correct

40.	In one of the following types of coal, the percentage of carbon is more than the remaining types.
	A. bintumans
	B. lignite
	C. Pete
	D. anthracite Option”D” is correct

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