Electronic Devices Test

Result

Electronic Devices Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Potentiometer is a device that is used to _______ two cell’s emf and to determine the ________ of the cell.

A
determine, internal resistance

B
compare, internal resistance

C
discharge, load

D
disconnect, power

Solution

Potentiometer is the device that is used to compare the two cell’s emf and to determine the internal resistance of the cell.
Question 2
1 / -0

Potentiometer are rarely used to directly control significant power, more than a few _____.

A
Volt

B
Watt

C
Newton

D
Joule

Solution

Potentiometer are sensitive devices and cannot be operated for high power operation.
Question 3
1 / -0

Two cells of emfs approximately 5V and 10V are to be accurately compared using a potentiometer of length 400 cm.

A
The battery that runs the potentiometer should have a voltage of 8V

B
The battery of potentiometer can have a voltage of 15V and R adjusted so that the potential drop across the wire slightly exceeds 10 V

C
The first portion of the 50 cm wire itself should have a potential drop of 10 V

D
Potentiometer is usually used for comparing resistances and not voltages

Solution

In a potentiometer experiment, the emf of a cell can be measured, if the potential drop along potentiometer wire is more than the emf of the cell to be determined.

Here, emfs of the two cell are given as 5V and 10 V