Question

Give reasons for the following:
a) It is difficult to cut cloth using a blunt scissors.
b) A pencil needs to be sharpened after continuous writing.
c) Caterpillar tracks are provided in the tanks.
d) Lightning is seen first and the sound of thunder is heard later.
e) Repulsion is a sure test for testing a charge.

Answer 1

it is always difficult to cut cloth with a blunt scissors because blunt scissors losts its sharpness.
a pencil is needed to be sharpened after continuous writing because due to draging of the pencil lead it reduces its Sharpness.
lighting s seen first because the speed of light is faster than sond and sond is heard later because sound travels at less speed compared to light