a2zinterviews

17.	Which of the following electromagnetic wave has the longest wavelength?
	A.  Gamma rays
	B.  Ultra violet rays
	C.  Light rays
	D.  Infra red rays

Answer

Ans: D Infra red rays

18.	The boiling point of ethanol is
	A.  252 K
	B.  290 K
	C.  329 K
	D.  351 K

Answer

Ans: D 351 K

19.	Which type of glass is used in telecommunications?
	A.  Pyrex glass
	B.  Flint glass
	C.  Optical fibres
	D.  Soda glass

Answer

Ans: C Optical fibres

20.	Bleaching powder is prepared by passing chlorine through
	A.  Quicklime
	B.  Dry slaked lime
	C.  Limestone
	D.  Milk of lime

Answer

Ans: B Dry slaked lime