Wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

POTENTIOMETER1 16122018

Total questions: 30

Worksheet time: 19mins

Name
Class
Date
1.

A potentiometer wire of length 1 m is connected to a driver cell of emf 3 V as shown in the figure. When a cell of 1×5 V emf is used in the secondary circuit, the balance point is found to be 60 cm. On replacing this cell and using a cell of unknown emf, the balance point shifts to 80 cm.Calculate unknown emf of the cell.

a)

1 V

b)

1.5 V

c)

3 V

d)

2 V

e)

2.2 V

2.

The following graph shows the variation of terminal potential difference V, across a combination of three cells in series to a resistor, versus the current. Calculate the emf and internal resistance of each cell

a)

E = 6 V & r = 3 ohm

b)

E = 2 V & r = 1 ohm

c)

E = 6 V & r = 1 ohm

d)

E = 2 V & r = 3 ohm

e)

E = 1 V & r = 1 ohm

3.

A cell of emf ‘E’ and internal resistance ‘r’ is connected across a variable resistor ‘R’. Plot a graph showing the variation of terminal potential ‘V’ with resistance R.

a)

1

b)

2

c)

3

d)

4

e)
4.

Name the instrument used to measure the emf of a cell

a)

Voltmeter

b)

Ammeter

c)

Potentiometer

d)

Galvanometer

e)

Multimeter

5.

Why potentiometer is preferred to Voltmeter for measurement of emf?

a)

long wire is used

b)

null method

c)

no special advantage

d)

Alloys are used in potentiometer wire

6.

Name the material used for making potentiometer wire

a)

Copper

b)

Aluminium

c)

Brass

d)

Manganin

e)

silver

7.

Essential condition for working of potentiometer circuit

a)

Positive terminal cells in the primary circuit and secondary circuit are connected to same point

b)

Emf of cell in the primary circuit has to be greater than that of a cell in the secondary circuit

c)

Connections must be neat and tight

d)

Current flowing through the wire must be constant

8.

How to increase the sensitivity of a potentiometer?

a)

1. Connect a resistance series to the primary circuit of the potentiometer

b)

2. Use a cell of low emf in the primary circuit

c)

3. Increase the length of the potentiometer wire

d)

only 1 & 2

e)

1, 2 & 3

9.

Copper wires are not used in the construction of potentiometer because

a)

low resistance

b)

high temperature coefficient

c)

low resistance & high temperature coefficient

d)

expensive

e)

non availability

10.

What is the use of a potentiometer?

a)

1. comparison of emf's of two primary cells

b)

2. finding internal resistance of a cell

c)

3. can be used as a variable resistor

d)

1 & 2

e)

1,2 & 3

11.

Name the factors decide internal resistance of a cell

a)

1. temperature

b)

2. nature of the electrolyte

c)

3. nature of the electrodes

d)

4.distance between the electrodes

e)

1,2,3 & 4

12.

Potential difference across it's terminals when cell is in open

circuit

a)

emf

b)

Terminal potential difference

c)

lost volt

d)

work

13.

Potential difference across it's terminals when cell is in closed circuit

a)

emf

b)

terminal potential difference

c)

work

d)

lost volt

14.

How to test the correctness of connections in a potentiometer?

a)

On completing the connections G shows a deflection

b)

Opposite deflections when jockey is placed at both ends of the potentiometer wire

c)

Galvanometer shows deflection towards right

d)

Galvanometer shows deflection towards left

e)

Galvanometer shows deflection towards right or left

15.

What is the principle of potentiometer ?

a)

V is proportional to L, when steady current flows through a wire of uniform area of cross section at constant temperature

b)

deflection in G is proportional to current

c)

resistance is proportional to length

d)

resistance is inversely proportional to area of cross section

e)

resistance is proportional to temperature

16.

If the Galvanometer needle keeps shaking in an experiment what you conclude?

a)

connections may be loose

b)

emf of the cell may be varying

c)

faulty potentiometer

d)

galvanometer may be faulty

17.

Calculate the balance point of the cell. Resistance of the potentiometer wire is 20 ohm and length of the wire is 400 cm.

a)

0.375 m

b)

7.5 cm

c)

25 cm

d)

200 cm

e)

300 cm

18.

What happens to the balancing length if the value of the variable resistance R is increased?

a)

decreases

b)

increases

c)

no change

d)

can not predict

19.

Find the potential difference across the 50 ohm resistance?

a)

10 V

b)

5 V

c)

2.5 V

d)

2 V

e)

1 V

20.

What can be reason for one sided deflection in a potentiometer experiment?

a)

Emf of a cell in the primary circuit may be less than that in secondary circuit

b)

Cells in the primary and secondary circuit are connected with opposite terminals

c)

connections may be loose

d)

length of the wire may be too long

21.

If the deflection of the galvanometer increases from A to B, but not zero on reaching B. what could be the reason?

a)

emf of cell in primary circuit may be less compared to that in

secondary

b)

connections may be loose

c)

emf of cell in primary circuit may be more compared to that in

secondary

d)

Cells may be connected with opposite polarity

22.

If the deflection of the galvanometer decreases from A to B, but not zero on reaching B. what could be the reason?

a)

emf of cell in primary circuit may be less compared to that in

secondary

b)

connections may be loose

c)

emf of cell in primary circuit may be more compared to that in

secondary

d)

Cells may be connected with opposite polarity

23.

With K2 closed, if S is increased, how the balancing the length will change?

a)

increases

b)

decreases

c)

no change

d)

may increase or decrease

24.

L2 is the balancing length with K2 closed and L1 is the balancing length with K2 open.Then

a)

L1 = L2

b)

L1 > L2

c)

L1 < L2

d)

Cannot predict

25.

Potential gradient is .........

a)

V/L

b)

current X resistivity/Area of cross section

c)

inversely proportional to sensitivity

d)

IR

26.

An ideal battery of 4 V and resistance R are connected in series in the primary circuit of a potentiometer of length 1 m and resistance 5Ω. The value of R, to give a potential difference of 5 mV across 10 cm of potentiometer wire is

a)

490

b)

495

c)

480

d)

395

27.

A potentiometer wire of length 100 cm has a resistance of 10 ohm. it is connected in series with a resistance and an accumulator of e.m.f 2 V and of negligible internal resistance . A source of e.m.f. 10 m V is balanced against a length of 40 cm of the potentiometer wire. What is the value of external resistance?

a)

790 ohms

b)

480 ohms

c)

1120 ohms

d)

640 ohms

28.

A potentiometer wire is 10 m long and has a resistance of 18Ω. It is connected to a battery of emf 5V and internal resistance 2Ω. Calculate the potential gradient along the wire.

a)

0.45 V/m

b)

0.9 V/m

c)

0.8 V/m

d)

0.25 V/m

29.

Two cells of ends E1​ and E2​(E1 ​> E2​) are connected as shown In figure. When a potentiometer is connected between A and B, the balancing length of the potentiometer wire is 300 cm. On connecting the same potentiometer between A and C, the balancing length is 100 cm. The ratio lofE2​/E1​​ is

a)

3 :1

b)

1 : 3

c)

3 : 2

d)

2 : 3

30.

A resistance of R Ω draws current from a potentiometer as shown in the figure. The potentiometer has a total resistance R0​Ω. A voltage V is supplied to the potentiometer. find the voltage across R when the sliding contact is in the middle of the potentiometer.

a)

2 V R4R + R0\frac{2\ V\ R}{4R\ +\ R_0}

b)

2 V RR +4R0\frac{2\ V\ R}{R\ +4R_0}

c)

4 V R2R +R0\frac{4\ V\ R}{2R\ +R_0}

d)

2 V R04R +R0\frac{2\ V\ R_0}{4R\ +R_0}

Similar Resources on Wayground

ÔN TẬP VẬT LÝ 11 - Phần 1

25 questions

ÔN TẬP VẬT LÝ 11 - Phần 1

quiz

Worksheet

•

12th Grade

Kinetic Energy

25 questions

Kinetic Energy

quiz

Worksheet

•

11th - 12th Grade

Kinametics_CT

25 questions

Kinametics_CT

quiz

Worksheet

•

9th - 12th Grade

Energy Work and Power Lesson

25 questions

Energy Work and Power Lesson

quiz

Worksheet

•

10th - 12th Grade

refraction

25 questions

refraction

quiz

Worksheet

•

10th - 12th Grade

2. Electrostatic potential and capacitance

25 questions

2. Electrostatic potential and capacitance

quiz

Worksheet

•

12th Grade

Radioactive decay

25 questions

Radioactive decay

quiz

Worksheet

•

12th Grade

Semiconductor

25 questions

Semiconductor

quiz

Worksheet

•

10th Grade - University