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Home > NCERT Solutions > Rajasthan Board of Secondary Education > Class 8 > Science > Science > Chapter 15 Some Natural Phenomena
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Which of the following cannot be charged easily by friction?
A copper rod
A plastic scale
An inflated balloon
A woollen cloth.
A.
When a glass rod is rubbed with a piece of silk cloth the rod
and the cloth both acquire positive charge.
becomes positively charged while the cloth has a negative charge.
and the cloth both acquire negative charge.
becomes negatively charged while the cloth has a positive charge.
Write T against true and F against false in the following statements:Like charges attract each other.
Write T against true and F against false in the following statements:A charged glass rod attract a charged plastic straw.
Lightning conductor cannot protect a building from lightning.
Write T against true and F against false in the following statements:Earthquakes can be predicted in advance.
Sometime, a crackling sound is heard while taking off sweater during winters. Explain.
Explain why a charged body loses its charge if we touch it with our hand.
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?
Suggest three measures to protect ourselves from lightning.
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