Question

Give reasons for the following statements-
(a) 'Snow shoes' are more effective than ordinary shoes for walking on
snow.
(b) Porters place a large round piece of cloth on their heads when they
carry heavy loads.
(c) A sharp knife cuts vegetables and fruits more effectively than a blunt
knife.
(d) School bags are provided with wide straps to carry them.
(e) It is much easier to burst an inflated balloon with a needle than
(directly) with the finger.
(1) Mountaineers may suffer from nose bleeding at high altitudes.
(g) Airplanes have pressurised cabins for passenger safety while flying high

in the atmosphere.​

Answer 1

a)as they are made with larger surface area so that pressure decreases and the person walking with those fors not sink in the snow (surface area is indirectly propotional to pressure )