Q5 of 26 Page 134

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

When we touch a charged object our body conducts its charges to the earth because our body is the conductor of electricity. Therefore a charged body loses its charge if we touch it with our hand. This phenomenon is called as electric discharge.


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3

Identify True or False sentences among the following:

(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)

 4

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

 6

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?

 7

Suggest three measures to protect ourselves from lightning. .