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R.N. Arora, A.P. Singh, Feroz Khan

excellent job. better if you had posted during day time

similar is the case with ice. it is too smooth, therfore coefficient of frictionis too low and hence the friction. it implies it is also difficult to walk on ice and it happens.
Always remember:
FRICTION IS THE NECESSARY CONDITION FOR US TO WALK

whatever be the normal reaction, since the coefficient of friction of the sand is too low, the frictional force is too low. Remember more the surface is rough, higher is the coefficient of friction.

when we push the ground backwards, according to third law the ground pushes us forwards and this force is the frictional force. since the frictional force by the sand is too less therefore it is difficult to walk on sand.

A) & B)

what for is this photo?

Chandigarh

not good

academic?

it is not academic. you do it everytime.

but all the students from I.C.S.E. i know do their 10+1, 10+2 ; non-medical from C.B.S.E.

achinbansal, 486 was the maximum marks not the cut-off.