[" How many given statements "],[" given below are correct? "],[" The sign convention of virtual "],[" object and virtual image is "],[" same and is always +ve related "],[" to case of mirrors "],[" Frictional force acting on both "],[" legs will be forward for man "],[" walking on ground."],[" Holes motion is just a "],[" convenient way to explain "],[" motion of electrons in valancy "],[" bond "],[" Work done by a force is always "],[" equal to zero,if displacement "],[" of object under the influence of "],[" that force is zero "]