Question 1 :
Franklin showed that _______ and the spark from our clothes during winters are the same phenomena. Fill in the blanks.<br/>
Question 2 :
Seismic waves that vibrate perpendicular to the direction of their path.
Question 6 :
_________ was the first to discover that lightning is electric discharge.<br/>
Question 7 :
State whether the given statement is True or False :Tremors on the Earth can also be caused by the eruption of a volcano. <br/>
Question 8 :
Fill in the  blank:<br/>In 1752, scientist Benjamin Franklin showed that lightning and spark from our clothes are ______ phenomena.
Question 11 :
Fill in the blank:<br/>A weak earthquake has a magnitude _________ on a Richter scale.
Question 12 :
State whether the given statement is True or False :Whenever there is a lightning, there is an earthquake. 
Question 14 :
Fill in the blank:<br/>The uppermost layer of the Earth is called _______.
Question 15 :
The point where the waves originate is called the _______ of the earthquake
Question 16 :
What should be the length of the metal rod used as lightning conductor?
Question 19 :
Which of the following is safest way to protect yourself from lightning?
Question 22 :
The objects which acquires small electric charges, when rubbed with each other, are called:
Question 23 :
How can we be safe when there is occurrence of lightning?
Question 25 :
When plastic comb is used to comb dry hair, type of charge does the comb acquire?
Question 26 :
<u> </u> is engineeredto protect an elevatedstructure in the event of lightning strike.<br>
Question 27 :
Name the scale on which the destructive energy of an earthquake is measured.
Question 28 :
The lightning conductor used in building, protects the building by :<br/>
Question 30 :
Select the correct option and write the completes statements.<br>What is the reason for twinkling of stars?