Pick out conductors and insulators from the following ?
Coin,corfk,Glass,Rubber,Keys,Pin,Plastic scale,Wooden blodck,Aluminium foil,Candle,Sewing needle,Thermocol,Paper nad Lead of pencil.

Classify the following materials into good conductors of heat and poor conductors of heat (or insulators) : Wood, Plastic, Copper, Air, Paper, Glass, Stainless steel, Aluminium, Thermocol, Rubber.

Four students A, B, C and D selected the following items from the materials available in the science laboratory to perform an experiment to study the refraction of light through a glass slab : (A) convex lens, glass slab, pins, drawing board, white paper, scale (B) glass slab, pins, drawing board, scale, white paper, protractor (C) glass slab, glass prism, candle, screen, pins, scale, drawing board, protractor (D) concave mirror, pins, glass slab, protractor, white paper, drawing board Correct choice of the items required is made by the student :