A block of mass 'M' is pressed against a wall with a horizontal force F. Then(a) it will slide down if the wall is smooth(b) frictional force may balance the weight if the wall is rough(c ) Normal reaction is equal to weight of the block (d) Normal reaction is zero if the wall is smooth

A block of mass 'M' is pressed against a wall with a horizontal force

1.	A block of mass 'M' is pressed against a wall with a horizontal force F. Then(a) it will slide down if the wall is smooth(b) frictional force may balance the weight if the wall is rough(c ) Normal reaction is equal to weight of the block (d) Normal reaction is zero if the wall is smooth
Answer» A & B are CORRECT a & d are correct C & d are correct b & c are correct ANSWER :A