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Question:

A tester is used to check the conduction of electricity through two liquids, labeled 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:

liquid B is a better conductor than liquid A

both liquids are equally conducting

liquid A is a better conductor than liquid B

conducting properties of liquid cannot be compared in this manner

Solution:

The correct option is C: liquid A is a better conductor than liquid B.

The amount of current flowing through a conducting solution depends on the conductivity of the solution. More the conductivity, more current passes through the solution and vice-versa. Hence, the conductivity of liquid A is more than the conductivity of liquid B.