If air and cloud were good conductors of electricity, do you think
lightning could occur? Explain
During the construction of a building the lightning conductor
was left hanging in the air by mistake. Would the lightning
conductor be still effective? Explain.
Plastic straws A and B are rubbed with dry cotton cloth. What
will happen if they are brought near each other?
If a charged plastic straw is brought near another uncharged plastic straw, what will happen?
State whether the following are True or False.
(a) Earthquakes occur all the time all over the world.
(b) The plates of the outermost layer of the earth are always in
continuous motion.
(c) Tremors on the earth can also be caused by the eruption of a
volcano.
(d) The process of electric discharge cannot occur between clouds
and the earth.
(e) Bathing outdoors should be avoided during thunderstorm.
Consider the list of terms given below
(i) Tsunami (iii) Floods (ii) Landslide (iv) Lightning
Earthquakes can cause
(a) (i), (ii) & (iii) (b) (ii) & (iv) (c) (ii), (iii) & (iv) (d) (iii) & (iv)
Major earthquakes are less likely to occur in
(a) North East India (c) Rann of Kutch
(b) Rajasthan (d) Orissa
The outermost layer of earth is called
(a) mantle (c) crust
(b) outer core (d) inner core
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