a2zinterviews

36.	The gas used in different types of welding would include
	A.  Oxygen and acetylene
	B.  Oxygen, hydrogen, acetylene and nitrogen
	C.  Oxygen and hydrogen
	D.  Oxygen, acetylene and argon

37.	Heavy water is
	A.  Rain water
	B.  Deuterium oxide
	C.  Water at- 4° C
	D.  Tritium oxide

38.	The filament of an electric bulb is made of
	A.  Iron
	B.  Tungsten
	C.  Graphite
	D.  Nichrome

39.	Which of the following substances is a bad conductor of electricity but a good conductor of heat?
	A.  Asbestos
	B.  Mica
	C.  Purspecks
	D.  Celluloid

40.	Chemical formula for water glass is
	A.   Na2SiO3
	B.  Al2O3
	C.  NaAIO2
	D.  CasiO3