A group of students were playing blindfold game. One boy, who was blindfolded, was asked to touch the given objects without seeing them.

Sandpaper      glaze paper      glass sheet      bark of a tree

 

How would he sort the object into groups?

Classify the given objects as conductors and insulators. 

How do conductors differ from insulators? 
 

Give reason for the following:

Silver tarnishes when left outside for few days or months.

Give reasons for the following.

Oil floats on water surface. 

Give reasons for the following:

Copper is used to make electric wires.

Give reason for the following. 

Plastic is used to coat the electric wires.