When a glass rod is rubbed with a piece of silk cloth the rod.(a) and the cloth both acquire positive charge(b) becomes positively charged while the cloth has a negative charge(c) and the cloth both acquire negative charge(d) becomes negatively charged while the cloth has a positive charge.
Write 'T’ against true and ‘F' against false in the following statements(a) Like charges attract each other.(b) A charged glass rod attract a charged plastic straw.(c) Lightning conductor cannot protect a building from lightning.(d) Earthquakes can be predicted in advance.
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?
The weather department has predicted that a thunder storm is likely to occur on a certain day.Suppose you have to go out on that day. Would you carry an umbrella? Explain.
