State any four methods to reduce friction

State the disadvantages of friction. OR State any four methods of reduce friction.

What are the methods of reducing friction?

State any five methods to produce plane polarized light.

State the methods to reduce / eliminate spherical aberration of lenses.

State any four effects of radioactive pollution.

State whether the following statement are True or False : One tends to slip over a banana peel on the street and one can slip due to mud are events that occur due to reduced friction.

State any four uses of concave mirror.

State any four points of difference between diamond and graphite ,

State any four properties of a conductor under electrostatic condition.

Give any four uses of sulfuric acid