Explain giving examples of the concept of lightning.

Explain, why when a plastic comb is rubbed with hair then it attracts tiny pieces of papers.

Name the scientist who showed that lightning and spark are the same phenomena.

State how many types of charges are there. Give their names.

Explain what happens when a positive charge is kept near a negative charge?

Briefly, explain how the charge can be detected with the help of an electroscope.

Give an application for earthing.

Briefly, explain how lightning occurs.

We should avoid carrying an umbrella during lightning. Explain why.

For what purpose lightning conductor is used in the buildings.

Give the name of two places in India where the earthquake causes the large destruction to life and property.

Mention how many layers the earth made of.

Name the device that is used to measure the strength of an earthquake.

Explaining briefly about seismic zones.

Plastic straws A and B are rubbed with a dry cotton cloth. What will happen, if they are brought near each other?

Will the lightning conductor be still required to be installed in the building?

Explain why should a person not stand under a tree during a thunderstorm.

In an electroscope, if a negatively charged body is brought in contact with the metal clip, the strips of the electroscope diverge. If now another charged object carrying an equal amount of positive charge is brought in contact with the clip, what will happen?

Define earthing.

How is thunderstorm produced?

Define electrification by friction.

Write the range of a very strong earthquake on the Richter scale.

If the materials used for constructing a building were good conductors, do you think lightning will strike the building?

An earthquake measures 2 on the Ritcher scale, would it be recorded by seismograph?

Explain why, sometimes when we take off the woolen sweater in a dark room, we can see tiny sparks of light and hear a cracking sound.

State what happens actually, when we touch the metal top of a charged electroscope with our fingers? What is this process known as?

How does lightning take place in the clouds?

What do you understand by the process of electric discharge?

What precautions should we take during an earthquake if we are outside?

How is tsunami affect the people?

Name the three layers of earth. Draw a labelled diagram to show the structure of the earth.

Explain in brief about seismograph. Also, draw a labelled diagram of a seismograph.

A glass rod is rubbed with a silk cloth and an inflated rubber balloon is rubbed with a woolen cloth. Out of glass rod, inflated rubber, silk cloth and woolen cloth:

(a) Mention the name of two objects acquires a negative charge. Why?

(b) Mention the name of two objects acquires a positive charge. Why?

We should use mobile phones rather than landline phones during a thunderstorm. Give reasons.