The potentiometer- Comparison of emf
 1) What is the use of a potentiometer? To measure potential difference across two points. To detect the flow of current through a circuit None of these. To measure the resistance of a wire

 2) Which of the following is an example of primary cell? Dry cell Mercury cell All of the above Leclanche cell

 3) Name the device which is used to measure the internal resistance of a cell? Galvanometer Resistance box Potentiometer Voltmeter

 4) What is the principle behind potentiometer? None of these. The current through a conducting wire is proportional to the potential difference between its ends. Wheatstone’s principle Potential difference applied to the wire is proportional to the balancing length.

 5) Potentiometer is often called as ideal voltmeter. Why? Potentiometer never draws current from the cell whose emf is to be measured. Potentiometer can measure very small potential differences. All are correct. Potentiometer is highly sensitive.

 6) How can you increase the accuracy of a potentiometer? By increasing the material of wire. By increasing the length of the potentiometer wire. By decreasing the voltage applied. By reducing the diameter of the wire.

 7) Which of the following is a factor, on which the emf of a cell depends? Nature of electrolyte All of the above Nature of electrode Temperature of electrolyte

 8) In a potentiometer experiment to compare the emf's of two primary cells, the balancing points obtained as l1 and l2 respectively. If E2 be the emf of the second cell, what is the emf E1 of the other cell? Data inadequate E1 = (E2×l1)/l2 E1 = (l1×l2)/E2 E1 = (E2×l2)/l1

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