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MOVING COIL GALVANOMETER 10012019

Total questions: 30

Worksheet time: 16mins

Name
Class
Date
1.

What is the function of a galvanometer?

a)

Detects the presence of current in a circuit

b)

Shows the direction of current in a circuit

c)

Can measure small current

d)

Can measure small potential difference

e)

Can measure resistance of the circuit

2.

Current sensitivity is ............

a)

Deflection produced by unit current

b)

Current needed to produce unit deflection

c)

Current needed to produce full scale deflection in galvanometer

d)

Voltage needed to produce full scale deflection

e)

Voltage needed to produce unit deflection

3.

What are the resistances of ideal voltmeter and ammeter?

a)

zero, infinity

b)

infinity, zero

c)

very high , very low

d)

very low , very high

e)

infinity, infinity

4.

How can a galvanometer be converted to a voltmeter?

a)

Connecting a high resistance in parallel to galvanometer

b)

Connecting a low resistance in series of galvanometer

c)

Connecting a high resistance in series of galvanometer

d)

Connecting a low resistance in parallel to galvanometer

5.

How can a galvanometer be converted to an ammeter?

a)

connecting a low resistance in series to galvanometer

b)

connecting a high resistance in series to galvanometer

c)

connecting a low resistance in parallel to galvanometer

d)

connecting a high resistance in parallel to galvanometer

6.

How can you increase the range of voltmeter?

a)

By increasing the resistance connected to the galvanometer

b)

By decreasing the resistance connected to the galvanometer

c)

Can't change the range

7.

Can you change a voltmeter in to an ammeter?

a)

No

b)

Yes

8.

Can you change an ammeter in to a voltmeter?

a)

Yes

b)

No

9.

Can Moving Coil Galvanometer detect AC? why?

a)

Yes, deflection is proportional to current

b)

No, average current is zero for AC

10.

How are the voltmeter and ammeter connected in circuit?

a)

series, parallel

b)

parallel, series

c)

parallel, parallel

d)

series, series

11.

What is the principle of galvanometer?

a)

Torque acts on a current carrying coil suspended in the uniform magnetic field, In radial magnetic field, deflection of coil is proportional to current

b)

Ohm's law

c)

Biot - Savart's law

d)

Ampere's circuital law

12.

The current sensitivity of Moving Coil Galvanometer increases by:

a)

Torque acts on a current carrying coil suspended in the uniform magnetic field

b)

increasing the no. of turns

c)

Increasing the area of the coil

d)

Increasing the magnetic induction

e)

Decreasing the couple per unit twist of the suspension fibre.

13.

What is the use of radial magnetic in galvanometer?

a)

allow maximum magnetic flux through the coil

b)

it gains maximum torque due to magnetic field

c)

makes the deflection proportional to current

d)

helps to use a linear scale

e)

torque becomes independent of the angle of deflection

14.

A galvanometer can be converted into a voltmeter to measure up to V volt by connecting a resistance R1 in series. The same galvanometer can measure V/2 volt by connecting a resistance R2 in series Find resistance R in terms of R1 & R2 to convert galvanometer into a voltmeter that can read up to 2V volt

a)

R = 3R1 - 2R2

b)

R1 + R2 = R

c)

R1 - R2 = R

d)

R = 2R1 - 3R2

15.

Arrange the following in the ascending order of resistance:

Ammeter, micro ammeter, milli ammeter, galvanometer

a)

Ammeter, micro ammeter, milli ammeter, galvanometer

b)

micro ammeter, milli ammeter, galvanometer, Ammeter

c)

Ammeter, milli ammeter, micro Ammeter, galvanometer.

d)

galvanometer, Ammeter, micro ammeter, milli ammeter

16.

Arrange the following in the ascending order of resistance:

Voltmeter, micro voltmeter, milli voltmeter, galvanometer

a)

Voltmeter, micro voltmeter, milli voltmeter, galvanometer

b)

micro ammeter, milli ammeter, galvanometer, Ammeter

c)

micro ammeter, milli ammeter, Ammeter, galvanometer,

d)

galvanometer, micro voltmeter, milli voltmeter, Voltmeter

17.

How to increase the voltage sensitivity of a galvanometer?

a)

increasing the magnetic induction

b)

increasing the number of turns

c)

increasing the area of the coil

d)

using spring of low couple per unit twist

18.

Name the material used for the construction of spring in a MCG and why?

a)

copper, low torsional constant

b)

phosphor bronze, large torsional constant

c)

phosphor bronze, low torsional constant

d)

steel, low torsional constant

19.

A galvanometer of resistance G and resistor of resistance R are connected in series to a cell of emf E. When another resistance S is connected parallel to the galvanometer the deflection in the galvanometer becomes half. find the correct relation for G from those given below.

a)

G = RS/R - S

b)

G = RS/S - R

c)

G = RS/R + S

d)

G = R - S /RS

20.

A galvanometer of resistance 100 ohm shows full scale deflection for a current of 1mA. How can you convert this galvanometer to a voltmeter of range 0 to 10V

a)

9900 ohm in series to G

b)

9900 ohm in parallel to G

c)

10100 ohm in parallel to G

d)

10100 ohm in series to G

21.

A galvanometer of resistance 100 ohm shows full scale deflection for a current of 1mA. How can you convert this galvanometer to a ammeter of range 0 to 10A

a)

0.01 ohm in series to G

b)

0.01 ohm in parallel to G

c)

0.1 ohm in parallel to G

d)

0.1 ohm in series to G

22.

ASSERTION(A): Current sensitivity of moving coil galvanometer can be increased by increasing the number of turns of the coil of the galvanometer.

REASON (R): The current sensitivity of a moving coil galvanometer is directly proportional to number of turns of the coil of the galvanometer.

a)

A & R are true and R is the correct explanation for A

b)

A & R are true but R is not the correct explanation for A

c)

Both A & R are false

d)

A is true but R is false

e)

A is false but R is true

23.

ASSERTION(A): Voltage sensitivity of moving coil galvanometer can be increased by increasing the number of turns of the coil of the galvanometer.

REASON (R): The voltage sensitivity of a moving coil galvanometer is directly proportional to number of turns of the coil of the galvanometer.

a)

A & R are true and R is the correct explanation for A

b)

A & R are true but R is not the correct explanation for A

c)

Both A & R are false

d)

A is true but R is false

e)

A is false but R is true

24.

ASSERTION(A): A galvanometer cannot be directly used to measure large values of current.

REASON (R): The galvanometer is highly sensitive and has a finite resistance.

a)

A & R are true and R is the correct explanation for A

b)

A & R are true but R is not the correct explanation for A

c)

Both A & R are false

d)

A is true but R is false

e)

A is false but R is true

25.

ASSERTION(A): If a voltmeter is connected parallel to a resistor in a closed circuit the potential recorded.by the voltmeter is less than the p. d. across the resistor before connecting the voltmeter.

REASON (R): The total resistance of the circuit increases due to the introduction of the voltmeter .

a)

A & R are true and R is the correct explanation for A

b)

A & R are true but R is not the correct explanation for A

c)

Both A & R are false

d)

A is true but R is false

e)

A is false but R is true

26.

The expression for shunt resistance(S) used to convert a galvanometer of resistance (G) showing full scale deflection for a current of Ig to an ammeter of maximum range I is ......

a)

(Ig×G)I−Ig\frac{\left(I_g\times G\right)}{I-I_g}

b)

(I − Ig)Ig×G\frac{\left(I\ -\ I_g\right)}{I_g\times G}

c)

IgGIg − I\frac{I_gG}{Ig\ -\ I}

d)

(I×G)I − Ig\frac{\left(I\times G\right)}{I\ -\ Ig}

27.

The current sensitivity of a galvanometer is

a)

CBAN\frac{C}{BAN}

b)

BANC\frac{BAN}{C}

c)

BANC G\frac{BAN}{C\ G}

d)

=Voltage sensitivityG =\frac{Voltage\ sensitivity}{G}\

e)

CGBAN\frac{CG}{BAN}

28.

The voltage sensitivity of a galvanometer is

a)

CBAN\frac{C}{BAN}

b)

BANC\frac{BAN}{C}

c)

BANC G\frac{BAN}{C\ G}

d)

 =Current sensitivityG =\frac{Current\ sensitivity}{G}\  

e)

CGBAN\frac{CG}{BAN}

29.

The expression for shunt resistance(S) used to convert a galvanometer of resistance (G) showing full scale deflection for a current of Ig to an voltmeter of maximum range V is ......

a)

 R =VIg−GR\ =\frac{V}{I_g}-G 

b)

 R =G − VIgR\ =G\ -\ \frac{V}{I_g} 

c)

 R = IgV−GR\ =\ \frac{I_g}{V}-G  

d)

 R = G − IgVR\ =\ G\ -\ \frac{I_g}{V}  

30.

A moving coil galvanometer uses concave cylindrical magnetic poles, because

a)

It provides radial magnetic field

b)

The effective component of magnetic field is always normal to the area vector of the coil

c)

The galvanometer can use a linear scale for measurement

d)

angle dependence of torque can be avoided

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