Some Natural Phenomenon Test - 1

When an uncharged body B is brought in contact with a positively charged body A, body B will become positively charged and the electrons will flow from B to A till an equilibrium is achieved.

When we rub a glass rod with a silk cloth, electrons are transferred from the glass to the silk cloth. So, the glass rod will become positively charged and the silk cloth will become negatively charged.

When a glass rod is rubbed with silk, the glass rod will become positively charged and silk will become negatively charged; and when an ebonite rod is rubbed with fur, the ebonite rod will become negatively charged and fur will become positively charged.

When a positively charged glass rod is touched with an electroscope, the electroscope leaves will also become positively charged and they will move apart; and when a negatively charged ebonite rod is brought near the cap of the electroscope, it will induce a positive charge on the cap and free electrons will move towards the leaves.

Hence, the leaves will become less positively charged and they will come closer to each other.

Lightning and electric shock are examples of static electricity. The clouds become charged because of the collisions of raindrops, snow crystals and hail stones. Static charge is developed. The upper part of the cloud becomes positively charged and the lower part becomes negatively charged.

Lightning is a flash of light.
Thunder is a loud sound with lightning.

Clouds are collection of tiny water droplets.
Rain is falling of water from the sky.

A gold leaf electroscope is used to detect charges.
The air around a lightning bolt is super heated to five times hotter than the sun.

Like charges repel each other.
Lightning conductors are used to protect a building from lightning.

Statement A is correct, statement B is also correct and B is the correct explanation of A.

The sharp edges can hold a large amount of charge and lightning rod provides the safe passage to static charge to move down to earth.

They should squat on knees and place head between the hands. This position will make them the shortest object which is unlikely to be hit by the lightning.

An earth-to-cloud lightning flash begins from a tall ground-based object and moves upward. This type of lightning is common with strikes to towers and skyscrapers which are at the same potential as the earth.

When water from the ground evaporates, it rises up towards the clouds and forms clusters of droplets. This rising moisture collides with water droplets within the clouds and, as a result the droplets have some of their electrons ripped off, causing separation between the now positively charged rising moisture and the negatively charged electrons they have left behind.