Pick out the application of potentiometer from the following.

It measures external resistance

It measures internal resistance

It measures external resistance

It is used to compare two currents

Explore topic-wise MCQs in Physics.

This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.	Pick out the application of potentiometer from the following.
A.	It measures current
B.	It measures internal resistance
C.	It measures external resistance
D.	It is used to compare two currents
Answer» C. It measures external resistance

Discussion

2.	A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is 10-9Ωm and the current passing through it is 0.5A and the cross sectional area of the wire is 10-8m2. Calculate the potential gradient along the potentiometer wire.
A.	0.5 × 10-9 V/m
B.	0.5 × 10-8 V/m
C.	0.5 × 10-1 V/m
D.	0.5 × 10-15 V/m
Answer» D. 0.5 × 10-15 V/m

Discussion

3.	The balancing length of a potentiometer is at 120 cm. On shunting the cell with a resistance of 4 ohms, the balancing point shifts to a length of 60 cm. Then, find the internal resistance of the cell.
A.	2 ohms
B.	5 ohms
C.	3 ohms
D.	4 ohms
Answer» E.

Discussion

4.	In a potentiometer of 5 wires, the balance point is obtained on the 2nd wire. To shift the balance point to the 4th, we should decrease the current of the main circuit.
A.	True
B.	False
Answer» B. False

Discussion

5.	A potentiometer wire of length 20 m has a resistance of 50 ohms. It is connected in series with a resistance box and a 5 V storage cell. If the potential gradient along the wire is 0.5 mV/cm, what is the resistance unplugged in the box?
A.	450 ohms
B.	400 ohms
C.	405 ohms
D.	500 ohms
Answer» B. 400 ohms

Discussion

6.	A potentiometer using cell C of emf 5V and internal resistance 0.2 ohms is connected to a wire AB in the figure below. A standard cell C0 of a constant emf of 1.10 V gives a balance point at 55 cm of the wire. When C0 is replaced by a cell of emf E, the balance point is obtained at 85 cm. What is the value of E?
A.	1.4 V
B.	1.5 V
C.	1.7 V
D.	1.9 V
Answer» D. 1.9 V

Discussion

7.	A potentiometer wire of length 100 cm has a resistance of 30 ohms. It is connected in series with a resistance of 20 ohms and accumulator of emf 8V having negligible internal resistance. A source of 1.2V is balanced against a length L of the potentiometer wire. What is the value of L?
A.	20
B.	25
C.	30
D.	35
Answer» C. 30

Discussion

Explore topic-wise MCQs in Physics.

Pick out the application of potentiometer from the following.

A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is 10-9Ωm and the current passing through it is 0.5A and the cross sectional area of the wire is 10-8m2. Calculate the potential gradient along the potentiometer wire.

The balancing length of a potentiometer is at 120 cm. On shunting the cell with a resistance of 4 ohms, the balancing point shifts to a length of 60 cm. Then, find the internal resistance of the cell.

In a potentiometer of 5 wires, the balance point is obtained on the 2nd wire. To shift the balance point to the 4th, we should decrease the current of the main circuit.

A potentiometer wire of length 20 m has a resistance of 50 ohms. It is connected in series with a resistance box and a 5 V storage cell. If the potential gradient along the wire is 0.5 mV/cm, what is the resistance unplugged in the box?

A potentiometer wire of length 100 cm has a resistance of 30 ohms. It is connected in series with a resistance of 20 ohms and accumulator of emf 8V having negligible internal resistance. A source of 1.2V is balanced against a length L of the potentiometer wire. What is the value of L?