Question

d) Tsunamis always luoW uur
4. Give reasons for the following:
a) Buildings made on landfills or reclaimed area are most dangerous during earthquakes.
b) We should not carry an umbrella during thunderstorms.
c) Rishabh rubbed a plastic scale over his hair and brought it near bits of paper. The bits of
page
were attracted towards the scale. He tried the same thing with a metal scale but the bits of
paper were not attracted towards it.
d) We see a streak of light before hearing the sound of thunder.​

Answer 1

Explanation:

A. Landfills and reclaimed areas are made on the ground that is not solid enough to withstand the tremors caused during an earthquake. Hence, this type of land will not be able to support the heavy of the house and other property over them. Earthquakes can easily destroy buildings made in these areas.

B. Thunderstorms are electrically charged. Umbrellas mostly contain metal parts which are good conductors of electricity. The electric charge form thunderstorm can move into the umbrella and cause harm to the person carrying it. Therefore, it is nor safe carrying an umbrella during a thunderstorm.

C. A plastic is an insulator which gets electrically charges when rubbed on hair. It therefore attracts small bits of paper because paper gets polarized din the presence of charged plastic ruler resulting in a net force of attraction.

D. We see the lightning flash before we can hear thunder because, the speed of light is more than speed of sound.

Thanks for asking like ❤️ this

question ❓