Q# 1 Encircle the correct option. /30 Unit of frequency is __ .a) Meter b)Hertz c) Crest d) Trough Newton’s disk is made up of colours.a) 5 b) 7 c) 9 d)153) colour of light refracts maximum.a) Red b)Green c) Yellow d) Blue4) Blue and Red colors makes color.a) Magenta b) Cyan c) Yellow d)… Continue reading Previous paper class 7th(science)