Q. Sometimes, a crackling sound is heard while taking off sweater during winters. Explain.

Q. Suppose you are outside your home and an earthquake strikes. What precaution would you take to protect yourself?

Q. Name the scale on which the destructive energy of an earthquake is measured. An earthquake measures $3$ on this scale. Would it be recorded by a seismograph? Is it likely to cause much damage?

Q. Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?

Q. Describe with the help of a diagram an instrument which can be used to detect a charged body.

Q. Suggest three measures to protect ourselves from lightning.

Q. Explain why a charged body loses its charge if we touch it with our hand.

Q. The weather department has predicted that a thunderstorm is likely to occur on a certain day. Suppose you have to go out on that day. Would you carry an umbrella? Explain.

Q. When a glass rod is rubbed with a piece of silk cloth the rod:

1. becomes positively charged while the cloth has a negative charge.
2. and the cloth both acquire positive charge.
3. becomes negatively charged while the cloth has a positive charge.
4. and the cloth both acquire negative charge.

Q. List three states in India where earthquakes are more likely to strike.

Q. Write T against true and F against false in the following statements:
(a) Like charges attract each other (T/F)
(b) A charged glass rod attract a charged plastic straw (T/F)
(c) Lightning conductor cannot protect a building from lightning (T/F)
(d) Earthquakes can be predicted in advance (T/F)