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VITEEE 2011 Paper

Section: Physics

Question : 8 of 120

Marks: +1, -0

Pick out the wrong statement.

In a simple battery circuit, the point of lowest potential is the negative terminal of the battery.
The resistance of an incandescent lamp is greater when the lamp is switched off.
An ordinary 100W lamp has less resistance than a 60 W lamp.
At constant voltage, the heat developed in a uniform wire varies inversely as the length of the wire used.

Solution:

We know that resistance of an incandescent lamp depends upon the nature of the material used, its dimensions and physical conditions .

\therefore

It doesnot effect whether the lamp is switched OFF or

\text{ON}

or in other words the resistance remains the same whether the bulb is switched OFF or ON.

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