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Dear Student,
Answer to Q1:
Materials are classified into conductors and insulators based on the amount of free electrons available for conduction. There are large number of free electrons in a conductor which can respond to the electric field and supports flow of current, specifically, conduction current through it. Examples of conductors: metals like, Copper, Gold, etc.
Insulators do not have free electrons and thus does not allow current to flow through it. At maximum electrons can displace about their mean position leading to separation of charges along the direction of external electric field. This process is called polarisation. Examples of insulators are: glass, quartz, alumina, etc.

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1In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them. ... Most atoms hold on to their electrons tightly and are insulators.
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2 Use of magnet:
Magnets are used in magnetic compass, doorbells, refrigerators.
Magnets are used in dynamos, motors, loudspeakers, microphones etc.
Ceramic magnets are used in computers.
Magnets are used in toys to give a magic effect.
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3 A freely suspended magnet always rests in the north-south direction because the magnetic south pole of the earth lies in the geographic north direction and the magnetic north pole of the earth lies in the geographical south direction
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4 ..

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Q1) In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them. "Conductor" implies that the outer electrons of the atoms are loosely bound and free to move through the material. Most atoms hold on to their electrons tightly and are insulators. In copper, the valence electrons are essentially free and strongly repel each other. Any external influence which moves one of them will cause a repulsion of other electrons which propagates, "domino fashion" through the conductor.

Simply stated, most metals are good electrical conductors, most nonmetals are not. Metals are also generally good heat conductors while nonmetals are not.

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Q 2) 
  • Secure a trash bag. ...
  • Hold pins while sewing. ...
  • Corral paper clips. ...
  • Stick up kids' cups. ...
  • Add removable pizzazz to a lamp shade. ...
  • Fix a drafty door. ...
  • Organize your makeup. ...
  • Store aluminum foil and plastic wrap on the fridge.
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Q3) A freely suspended magnet always rests in the north-south direction because the magnetic south pole of the earth lies in the geographic north direction and the magnetic north pole of the earth lies in the geographical south direction.
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