A tester is used to check the conduction of electricity through two liquids,
labelled A and B. It is found that the bulb of the tester glows brightly for
liquid A while it glows very dimly for liquid B. You would conclude that
(i) liquid A is a better conductor than liquid B.
(ii) liquid B is a better conductor than liquid A.
(iii) both liquids are equally conducting.
(iv) conducting properties of liquid cannot be compared in this manner.
When the free ends of a tester are dipped into a solution, the magnetic
needle shows deflection. Can you explain the reason?
Fill in the blanks.
(a) Most liquids that conduct electricity are solutions of ,
______________ and ______________.
(b) The passage of an electric current through a solution causes
______________ effects.
(c) If you pass current through copper sulphate solution, copper gets
deposited on the plate connected to the terminal of the
battery.
(d) The process of depositing a layer of any desired metal on another
material by means of electricity is called .
Lightning and thunder take place in the sky at the same time and at the
same distance from us. Lightning is seen earlier and thunder is heard
later. Can you explain why?
Your parents are going to buy a house. They have been offered one on the
roadside and another three lanes away from the roadside. Which house
would you suggest your parents should buy? Explain your answer.
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