FSC Physics MCQs Chapter 13 Class 12

Created on February 07, 2022

Physics Ch 13 Class 12 Current Electricity

1 / 72

Which of the following work (s) on the principle of wheatstone Bridge?

NTS 2011
Physics
Current Electricity
Elimination Tool:

A) slide-wire bridge

B) meter-bridge

C) post office box

D) all of these

2 / 72

Resistivity of Silver is ohmmeter

1.52 x 10-8

2.89 x 10-8

1.02 x 10-8

1.82 x 10-8

3 / 72

An ammeter reads up to 1 A. Its internal resistance is 0.81 Ω. To increase the range to 10 A, the value of the required shunt is:

NTS 2012
Physics
Current Electricity
Elimination Tool:

A) 0.3 Ω

B) 0.9 Ω

C) 1.3 Ω

D) 0.09 Ω

4 / 72

A wire of resistance R is bent in the form of a circle the resistance between two points on the circumference of the wire and at the end of the diameter of circle is

NUMS 2019 Reconduct
Physics
Current Electricity
Elimination Tool:

A) R/4

B) R/2

C) R

D) 2R

5 / 72

The unit of resistivity is:

NUMS 2020
Physics
Current Electricity
Elimination Tool:

A) ohm

B) ohm meter

C) ohm/meter

D) meter/ohm

6 / 72

Siemen is the SI unit of:

Conductivity

Resistivity

Conductance

None of these

7 / 72

Which of the following convert the heat energy Into electrical energy

Thermocouple

Thermometer

Potentiometer

None of these

8 / 72

If length of a wire is Increased two times and Its cross-sectional area is reduced to half, the resistance of the wire will be:

2R

0.5 R

4R

0.25 R

9 / 72

A generator of e.m.f. 80 V has an internal resistance of 0.04 Ω. If its terminal voltage is 75 V, determine the current.

NTS 2013
Physics
Current Electricity
Elimination Tool:

A) 125 A

B) 135 A

C) 145 A

D) 155 A

10 / 72

The power of an electric bulb is 100W. It is connected to 110V power supply. The resistance of electric bulb will be?

NUMS 2020
Physics
Current Electricity
Elimination Tool:

A) 11 ohm

B) 121 ohm

C) 20 ohm

D) 200 ohm

11 / 72

A 100 watt bulb is operated by 240 volts, the current through the bulb will be:

NTS 2012
Physics
Current Electricity
Elimination Tool:

A) 2.4 A

B) 240 A

C) 0.416 A

D) 41.6 A

12 / 72

How much energy is dissipated as heat in 20 s by a 100 Ω resistor that carries a current of 0.5 A?

NTS 2014
Physics
Current Electricity
Elimination Tool:

A) 50 J

B) 100 J

C) 250 J

D) 500 J

13 / 72

Three resistors connected in series have Individual voltages labeled V1, V2, and V3, respectively. Which of the following expresses the value of the total voltage V, taken over the three resistors
together?

VT= V1 + V2 + V3

VT = V1= V2 = V3

VT = (1/V1 + 1/V2 + 1/V3)^-1

VT = (1/V1 + 1/V2 + 1/V3)

14 / 72

The change in resistance of metallic conductor at temperature below 0 degrees is:

PMC 2020
Physics
Current Electricity
Elimination Tool:

A) Non-linear

B) Curve

C) Linear

D) Curvilinear

15 / 72

n which of the following more heat energy is produced?

A bulb of resistance 5m ohm operated for 1 min by suppling a current of 120 A

An Iron producing heat energy of 2 kJ

A tube working for 2 mins with a supply of 50A current and offering a resistance of 0.02 ohms

Both a and c produce same energy

16 / 72

The power dissipated in a resistor is 12.8 watts when 4A current Is passed. Hw much power will be dissipated If 6A current Is passed through the same resistor?

16 watts

24 watts

28.8 watts

32.5 watts

17 / 72

A 50 watt bulb is operated by 120 volts. What is the current through the bulb?

NTS 2016 SMBBMC
Physics
Current Electricity
Elimination Tool:

A) 0.416 A

B) 1.5 A

C) 2.5 A

D) 3.5 A

18 / 72

If three resistances RI, RI and R3 are connected In Parallel to the circuit such that RI> RI > RI. Which of the following will be true for the Equivalent Resistance R’?

R' > R1 > R3

R' < R3

R' = R3

R1< R' < R3

19 / 72

A battery whose emf is 40 V has an internal resistance of 5 Ohms. If this battery is connected to a 15 Ohms resistor ‘R’, what will be the voltage drop across ‘R’:

NTS 2010
Physics
Current Electricity
Elimination Tool:

A) 10 V

B) 30 V

C) 40 V

D) 50 V

20 / 72

If a magnetic field around a current carrying wire is anticlockwise then the direction of current flow is a

Upwards

Downward

Rightward

Leftward

21 / 72

The potential difference between the terminals of a battery in an open circuit is 2.2 V. When it is connected across a resistance of 5.0 Ω, the potential falls to 1.8 V. What is the internal resistance of the battery?

NTS 2015 DUHS and JSMU
Physics
Current Electricity
Elimination Tool:

A) 9.11 Ω

B) 2.11 Ω

C) 3.11 Ω

D) 1.11 Ω

22 / 72

Volt/ohm=

Sec

Ampere

Coulomb

Hertz

23 / 72

A row of 25 decorative lights, connected in series, is connected to a main transformer. When the supply is switched on, the lights do not work. The owner uses a voltmeter to test the circuit. When the voltmeter is connected across the third bulb in the row, a reading of zero is obtained. Which of the following cannot be the only fault in the circuit?

NTS 2017
Physics
Current Electricity
Elimination Tool:

A) The filament of one of the other bulbs has broken

B) The filament of the third bulb has broken.

C) The fuse in the mains transformer has blown.

D) There is a break in the wire from the supply to the transformer.

24 / 72

Two resistors R1 and R2 may be connected either in series or in parallel across a battery of zero internal resistance. It is required that the joule heating for parallel combination be five times that for series combination. If R1 = 100Ω, find possible values of R2.

NTS 2013
Physics
Current Electricity
Elimination Tool:

A) 38.2 Ω

B) 35.3 Ω

C) 48.2 Ω

D) None of the above

25 / 72

When a conductor of a cross-sectional area 5×10-6 m2 carries a current of 6 A, the drift velocity of the conduction electrons is 1.2-4 x 10-1 ms1-. What is the number density (number per unit volume) of the conduction electrons?

NTS 2010
Physics
Current Electricity
Elimination Tool:

A) 4×10-28 m-3

B) 1.6×10-27 m-3

C) 2.5×10-27 m-3

D) 6.3×1028 m-3

26 / 72

A battery has an e.m.f of 6.0 volts and an internal resistance of 0.4 ohms. It is connected to a 2.6 ohms resistor through a SPST (single pole, single throw switch).

When the switch is open, the potential difference between the terminal of the battery is:

NTS 2010
Physics
Current Electricity
Elimination Tool:

B) 0.8 V

C) 2.6 V

D) 5.2 V

E) 6.0 V

27 / 72

The electrons in a conductor drift with a velocity of:

NUMS 2019 Reconduct
Physics
Current Electricity
Elimination Tool:

A) 10-3 ms-1

B) 104 ms-1

C) 10-6 ms-1

D) 107 ms-1

28 / 72

What is the constant of proportionality in ohms law:

R

1/R

I

V

29 / 72

Unit of emf?

Volts

Henry

Watt

Ampere

30 / 72

Three resistors of 7 ohm, 5 ohm and 8 ohm are connected in series. Current flow will be maximum through:..

5 ohm

7 ohm

8 ohm

Will be Same

31 / 72

One of the following is an Ohmic device:

PMC 2020
Physics
Current Electricity
Elimination Tool:

A) Filament bulb

B) Semiconductor diode

C) Transistor

D) Copper wire

32 / 72

If length of the wire becomes two times to the original value and area becomes one half to its original value, then resistance of the wire becomes:

NUMS 2020
Physics
Current Electricity
Elimination Tool:

A) Double

B) Four times

C) One hall

D) One fourth

33 / 72

Temperature co-efficient of resistance is:

Fractional change in resistance

Fractional change In resistivity

Fractional change in resistance per kelvin change in temperature

Fractional change in resistance per degree change in temperature

34 / 72

One kilowatt-hour is commonly termed as one commercial unit of electric energy which is equal to:

PMC 2020
Physics
Current Electricity
Elimination Tool:

A) 3.6 x 105 J

B) 3.6 x 106 J

C) 3.6 x 104 J

D) 3.6 x 103 J

35 / 72

The resistivity in SI units is measured in:

NTS 2016 DUHS & JSMU
Physics
Current Electricity
Elimination Tool:

A) Ω – m

B) Ω – m2

C) Ω / m

D) Ω / m2

36 / 72

The instrument(s) which work on the principle of Wheatstone bridge is/are:

NTS 2012
Physics
Current Electricity
Elimination Tool:

B) The Post Office Box

C) Carey Foster's Bridge

D) Calendar

E) All of the these options

37 / 72

The deviation of I-V graph from straight line is due to:

NUMS 2016
Physics
Current Electricity
Elimination Tool:

A) Decrease in temperature and decrease in resistance

B) Increase in temperature and increase in resistance

C) Decrease in temperature and increase in resistance

D) Increase in temperature and decrease in resistance

38 / 72

If you wish to decrease the resistance of a circuit, you will add the resistors in ________.

NTS 2014
Physics
Current Electricity
Elimination Tool:

A) Series

B) Parallel

C) Does not make a difference

D) Cannot be determined

39 / 72

A battery has an e.m.f. of 4 V and internal resistance ‘r’. When this battery is connected to an internal resistance of 2 ohms, a current of 1 amp flows in the circuit. How much current will flow if the terminals of the battery are connected directly:-

NTS 2010
Physics
Current Electricity
Elimination Tool:

A) 1 A

B) 2 A

C) 4 A

D) 6 A

40 / 72

A galvanometer has a resistance of 20 ohms and a full-scale deflection when a current of 0.001 ampere flows in it. What is the value of the series resistance to convert it into a voltmeter of range 10 volts?

NTS 2014
Physics
Current Electricity
Elimination Tool:

A) 7780 ohms

B) 9980 ohms

C) 5580 ohms

D) 4480 ohms

41 / 72

A steady current of 5 A is drawn from an electric source at a voltage of 100 V. The power consumed (in Watts) is:

NUMS 2018
Physics
Current Electricity
Elimination Tool:

A) 0.05

B) 5

C) 500

D) 50000

42 / 72

If a 2-ampere current is drawn from the battery in 10 minutes, how much charge will flow through the circuit in this time?

NUMS 2015
Physics
Current Electricity
Elimination Tool:

A) 1200 Coulombs

B) 600 Coulombs

C) 500 Coulombs

D) 20 Coulombs

43 / 72

Drift velocity is of the order:

10^-4 ms^-1

10^-3 ms^-1

10^-1 ms^-1

44 / 72

If two or more resistors are joined to each other side by side, this combination is called:

NUMS 2018
Physics
Current Electricity
Elimination Tool:

A) Series combination of resistors

B) Parallel combination of resistors

C) Y delta combination of resistors

D) None of the above

45 / 72

An electric cell of e.m.f E, is connected across a copper wire of diameter d and length L. The drift velocity of electrons in the wire is v0. If the length of the wire is changed to 2L, the new drift velocity of electrons in the copper wire will be:

NUMS 2014
Physics
Current Electricity
Elimination Tool:

A) V

B) 2V

C) V/2

D) V/4

46 / 72

If we increase the cross-section area of a conductor having a length L, the resistance R of that conductor will be:

NTS 2018
Physics
Current Electricity
Elimination Tool:

A) Zero

B) Constant

C) Increasing

D) Decreasing

47 / 72

If in a circuit, 2 Ampere current is drawn from the battery in 10 minutes. How much charge will flow through the circuit in this time?

NTS 2018
Physics
Current Electricity
Elimination Tool:

A) 1200 Coulombs

B) 600 Coulombs

C) 500 Coulombs

D) 20 Coulombs

48 / 72

The fractional change in resistance per kelvin is known as:

NUMS 2016
Physics
Current Electricity
Elimination Tool:

A) None

B) Temperature coefficient of resistance

C) Thermal coefficient

D) Volumetric æfficient of expansion

49 / 72

Terminal voltage Vi of the battery is greater than emf of the battery when:

NUMS 2020
Physics
Current Electricity
Elimination Tool:

A) Battery is charging

B) Battery is discharging

C) Battery is connected with R

D) Battery is connected with voltmeter

50 / 72

If a voltage of 9V is applied between ends of a wire whose resistance is 0.2 ohm, what will be the resulting current?

NTS 2015 SMBBMC
Physics
Current Electricity
Elimination Tool:

A) 30

B) 35

C) 40

D) 45

51 / 72

A and B are bulbs connected in series with 40-volt battery and a bulb C is connected with 40-volt battery Glow of bulbs will be:

Same glow In all 3 bulbs

Same glow in bulbs A and B but different in bulb C

Different glow In all 3 bulbs

None of these

52 / 72

A current of 4.4 amperes is following in a write. How many electrons pass a given point in the wire in one second, if the charge on an electron is 1.6×10-19
Coulomb?

NTS 2011
Physics
Current Electricity
Elimination Tool:

A) 1.5 x 1019electrons

B) 2.75 x1019electrons

C) 3.25 x1019electrons

D) 2.75 x 1015electrons

53 / 72

A uniform wire of resistance 3 ohm is folded in such a way that it forms an equilateral triangle, then what is it’s resistance across the ends of any two vertices?

NUMS 2019 Cancelled
Physics
Current Electricity
Elimination Tool:

A) 2 ohm

B) 3 ohm

C) 2/3 ohm

D) 3/2 ohm

54 / 72

Three resistors R1, R2 and R3 are connected in series. If R1 > R2 > R3, the equivalent resistance will be:

Lesser than R1

Equal to R1

Lesser than R3

Greater than R1

55 / 72

Conductivity equals:

AR/L

1/AR

1/p

Both b and c

56 / 72

A thermocouple is immersed in water at 373 K and the other in ice at 273K. The emf of the thermocouple Is 90 (μ)V for each 1 K difference in temperature between junctions, and the thermocouple resistance is 6 Ω. What current will flow in the galvanometer connected in series with an internal resistance of 30ohms?

NTS 2010
Physics
Heat and Thermodynamics
Current Electricity
Elimination Tool:

A) 1.8 μA

B) 250 μA

C) 300 μA

D) 1.5 mA

57 / 72

The domestic electricity supply has a frequency of:

PMC 2020
Physics
Current Electricity
Elimination Tool:

A) 150 Hz

B) 100 Hz

C) 50 Hz

D) 25 Hz

58 / 72

Value of resistivity of iron Is

10.52 x 10 -8

5.00 x 10 -8

11.00 x 10 -8

100 x 10 -8

59 / 72

0.75 A current flows through an iron wire when a battery of 1.5 volts is connected across its ends. The length of the wire 5.0 m and its cross-sectional area is 2.5 x 10-7 m2. What is the resistivity of iron?

NTS 2015 DUHS and JSMU
Physics
Current Electricity
Elimination Tool:

B) 7.0 x 10-7Ωm

C) 5.0 x 10-7Ωm

D) 3.0 x 10-7Ωm

E) 1.0 x 10-7Ωm

60 / 72

If a wire of resistance R is stretched into double of its length, then it’s resistance becomes _________.

NUMS 2019 Reconduct
Physics
Current Electricity
Elimination Tool:

A) R

B) 2R

C) 3R

D) 4R

61 / 72

An emf of 120 volts of negligible internal resistance is connected across a resistance of 1000 ohm. The current flowing through the circuit will be:

NUMS 2015
Physics
Current Electricity
Elimination Tool:

A) 120 A

B) 120 x 103A

C) 120 x 10-3A

D) None

62 / 72

A bulb having a resistance of 150 Ω is connected to a 225 volt source, the current in the bulb will be:

NTS 2012
Physics
Current Electricity
Elimination Tool:

A) 1.5 A

B) 10 A

C) 3.7350 A

D) 250 A

63 / 72

When a wire is compressed and it’s radius becomes 2R then it’s resistance will be:

PMC 2020
Physics
Current Electricity
Elimination Tool:

A) 16R

B) 4 R

C) 1 / 16 R

D) 1 / 4 R

64 / 72

If voltage is 100V current is 10A and R Is 5ohm then internal resistance?

10 ohm

15 ohm

5 ohm

1 ohm

65 / 72

A battery of 6 volts is connected to two resistors of 3 ohm and 2 ohm joined together in series. What will be the current through the circuit?

NTS 2016 SMBBMC
Physics
Current Electricity
Elimination Tool:

B) 5.2 A

C) 4.2 A

D) 2.2 A

E) 1.2 A

66 / 72

A battery has an e.m.f of 6.0 volts and an internal resistance of 0.4 ohm. It is connected to a 2.6 ohm resistor through a SPST (single pole, single throw switch):

When the switch is closed, the potential difference between the terminal Is, in volts is:

NTS 2010
Physics
Current Electricity
Elimination Tool:

A) 0

B) 0.8

C) 2.6

D) 5.2

67 / 72

mho is the unit of 7

Resistance

Resistivity

Conductance

Conductivity

68 / 72

Which device is used to measure the potential difference between two points of a conductor in the laboratory?

NUMS 2020
Physics
Current Electricity
Elimination Tool:

A) Galvanometer

B) Ohmmeter

C) Ammeter

D) Potentiometer

69 / 72

Resistivity of Hg is ohmmeter

3.5 x 10-8

94 x 10-8

11 x 10-8

2027 x 10-8

70 / 72

An electric bulb is rated at 220 V, 100 W. What is its resistance?

NUMS 2016
Physics
Current Electricity
Elimination Tool:

A) 250 Ohms

B) 350 Ohms

C) 450 Ohms

D) 484 Ohms

71 / 72

When charge flows through a wire, it produces:

Magnetic field

Electric field

Both a and b

None of these

72 / 72

Two unequal resistances are connected parallel across a battery. Which of the following statements is true?

NUMS 2018
Physics
Current Electricity
Elimination Tool:

A) Same current will flow through both resistances

B) Current through smaller resistance is higher

C) Current through larger resistance is higher

D) Current can be higher in any resistance depending on emf of the cell

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