sir i want to know that what are the most important questions or type of questions for jee-2010 from this chapter

Dear Amitesh

In electrostatics most of the question  need tha concept of flux.so you must understand the gauss law chapter.

and you will also find one  question from the electric field.( some distribution of charge is given and you are required to find the electric field at some place.)

for example last year question:

"A solid sphere of radius R has a charge Q distributed in its volume with a charge density
ρ = κra, where κ and a are constants and r is the distance from its centre. If the electric
field at r =R/2  is 1/8  times that at r = R, find the value of a."

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Badiuddin