A charge q is enclosed in a sphere.... another charge of -q is present outside sphere ,will -q exert any force on q

ya i think so that -q will exert a force on +q if sphere is made up of conducting material

What change does conducting and non conducting make here? Can electric field penetrate a surface?

Force between two charges DOES NOT Depend on the material between them it si the same irrespective of what u keep in between

but the NET FORCE on each charge depends on the intervening medium!

so here the answer is it will still exert the same force as if the spehere wan't present

If the sphere is conducting, then the inner charge will NOT experience a force due to the outer charge because of "electrostatic shielding".