A static electric charge develops on the above said objects.

Electric current starts flowing in any metallic object kept nearby.

Lightning occurs.

The objects become conductors.

Woollen clothes get charged and thus, they attract hair.

The hair get entangled in spaces between the knitting.

Woollen clothes are made up of natural fibres and as hair are natural fibres as well, they are attracted to each other.

Woollen clothes are good conductors of heat, which makes them soft and sticky and thus, hair get stuck to them.

Lightning is caused by the build up of electrostatic charge in clouds.

Air is a bad conductor, but the presence of different impurities and impure water drops makes air partly conductive. It causes sparking from high tension wires which we perceive as lightning.

Condensation of water in the clouds causes sparking due to release of energy which we perceive as lightning.

When air blows, clouds collide with each other, which causes sparking due to friction, which we perceive as lightning.

The two foils further repel each other.

There is no effect of touching.

Foils start attracting each other and get joined to each other.

The foils come back to their original positions.

Positive charge

No charge

Some positive and some negative charge

Negative charge

To protect the electrical circuit from any power surge.

To protect the building from electrical shocks due to any leakage of current.

To charge the building and protect the building from lightning.

To keep the electrical wires in place.

The air current moves upwards while water droplets move downwards.

Both air current and water droplets move downwards.

The air current moves downwards and water droplets move upwards.

Both air current and droplets move upwards.

Disturbances in upper side of the earth’s crust

Disturbances deep inside the earth’s crust

Disturbances deep inside the mantle

Disturbances in the innermost part of the core

very large scale dust storms

earthquakes

ocean storms

very severe lightning storms

Upper edge of the cloud

In the middle of the cloud

Near the lower edge of the cloud

On the whole surface of the cloud

Richter scale

Knots

Intensity scale

Decibels

Seismology

Seismograph

Seismoscale

Seismodegree

Lightning inductor

Lightning wire

Lightning conductor

None of these

Bathing

Use of mobile phone

Use of cordless phone

Use of electrical lights

Only (a)

Only (a) and (b)

Only (c)

Only (b)