Physics Electrostatics MCQs Chapter 1 Class 12

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Created on February 07, 2022 By Ali Durrani

Physics Ch 12 Class 12 Electrostatics

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1 / 101

Unit of CV^2 is equivalent to that of?

Energy

Work

Power

None

2 / 101

The force between two point charges separated by a certain distance is F. If each charge is doubled and the distance between them is also doubled, then the force would be:

PMC Sample 1
Physics
Electrostatics
Elimination Tool:

A) 2 F

B) F

C) F/2

D) 4 F

3 / 101

If the potential difference of 1 volt is applied across the end of a conductor and the current flowing through the conductor is one ampere then the resistance of the conductor is said to be?

NTS 2015 SMBBMC
Physics
Electrostatics
Elimination Tool:

A) 1 Farad

B) 10 Coulomb

C) 1 Ohm

D) 1 coulomb

4 / 101

If capacitor is connected with battery and is fully charged then

Current will flow

Current will not flow

Depends on the dielectric

May or may not flow

5 / 101

Unit of electric field is:

N/C

Weber/sec

Volt/C

Joule/sec

6 / 101

Capacitance increases by

Increasing supplied Voltage

Increasing the Separation of plates

Increasing supplied current

Increasing the Area of Plates

7 / 101

Two positive point charges Q1 = 16 microCoulombs and Q2 = 4 micro Coulombs are seperated in a line by a distance of 3 meters. Find the spot on the line between the charges where the electric field is zero.

NUMS 2019 Reconduct
Physics
Electrostatics
Elimination Tool:

A) 3 m

B) 5 m

C) 4 m

D) 2 m

8 / 101

Energy required to charge a capacitor of 5 micro farad by connecting D.0 source of 20 KV is a) 10kJ b) 5k1 c) 21:.1 d) 11(1

10kJ

5kJ

2kJ

1kJ

9 / 101

Which one is the correct statement about selenium?

PMC Sample 2
Physics
Electrostatics
Elimination Tool:

A) selenium is a good conductor

B) selenium is a good insulator

C) selenium is an insulator in the dark and becomes conductor when exposed to light

D) selenium is an conductor in the dark and becomes insulator when exposed to light

10 / 101

The energy stored inside a capacitor is given by the relation:

NUMS 2019 Reconduct
Physics
Electrostatics
Elimination Tool:

A) Energy = ½ CV

B) Energy = ½ C2V

C) Energy = ½ CV2

D) Energy = ½ C/V

11 / 101

A charge is moving with velocity v, it enters a uniform electric field E. The direction of v and E are not parallel. What is the path of the charge particle inside the electric field?

PMC Sample 2
Physics
Electrostatics
Elimination Tool:

A) parabolic

B) circular

C) parallel to v

D) parallel to E

12 / 101

The values of electric intensity will ____ due to the presence of dielectric medium:

PMC 2020
Physics
Electrostatics
Elimination Tool:

A) Increase

B) Increase exponentially

C) Decrease

D) Remain same

13 / 101

If a 2 µF capacitor is connected, by closing a switch, to a supply of 100 volts through 1M ohm series resistance. What will be the time constant?

2 secs

3 secs

7 secs

4 secs

14 / 101

Capacitors store

Equal charges

Equal and opposite charges

Unequal charges

unequal and opposite charges

15 / 101

Two conducting objects X and Y having a charge Q on them exert force F on each other. Now third conductor having a charge -Q is touched to X and is removed, the new force between X and Y will be:

F/2

None

16 / 101

A parallel plate capacitor has a capacitance C. If the distance between the plates and the plates both halves, the capacitance will be?

NUMS 2017
Physics
Electrostatics
Elimination Tool:

A) 0.5 C

B) 4 C

C) 0.25 C

D) 2 C

17 / 101

The magnitude of electrostatic acceleration force between two point charges is directly proportional to the product of the magnitude of the charges and inversely proportional to the square of the distance between them.” This is known as:

NTS 2015 SMBBMC
Physics
Electrostatics
Elimination Tool:

B) Ohm’s law

C) Faraday's law

D) Newton's Law

E) Coulomb's Law

18 / 101

A sphere of charge +Q is fixed in a position. A smaller sphere of +q is placed near the larger sphere and released from the rest. The small sphere will move away from the large sphere with?

NTS 2014
Physics
Electrostatics
Elimination Tool:

A) Decreasing velocity and decreasing acceleration

B) Decreasing velocity and increasing acceleration

D) Increasing velocity and decreasing acceleration

C) Decreasing velocity and constant acceleration

19 / 101

Unit of Electric Intensity is

N/C

C/N

None of these

20 / 101

If a dielectric material is placed between two plates of a capacitor, the net capacitance of the capacitor:

NTS 2018
Physics
Electrostatics
Elimination Tool:

A) Decreases

B) Increases

C) Remains constant

D) Zero

21 / 101

If a potential difference of V appears on the plates of a capacitor with capacitance C, then energy stored will be:

2 C V^2

1/2 C V^2

1/2 C^2V

None of the above

22 / 101

Electric field strength of a point charge is E and electric potential is V, at a distance ‘r’ from the point charge. What is the electric potential at a point for the same point charge where electric field strength is E/4?

UHS 2019
Physics
Electrostatics
Elimination Tool:

A) 4V

B) 2V

C) V/2

D) V/4

23 / 101

When a charged particle is projected perpendicular to a magnetic field:

NUMS 2016
Physics
Electrostatics
Elimination Tool:

A) Its path is circular in a plane perpendicular to the plane of magnetic field

B) The speed and kinetic energy of the particle remains constant

C) The velocity and momentum of the particle changes only in direction

D) The time period of revolution, angular and frequency of revolution is independent of velocity of the particle and radius of circular path

24 / 101

Two negative charges are present at a distance d. A third positive charge is placed somewhere between these charges. This positive charge will be in equilibrium.

Stable

Unstable

Neutral

None of these

25 / 101

If magnitude of charges is doubled and distance between them is halved, the force between them will become?

16F

26 / 101

Two charges are separated by a distance r, in presence of which of the following the force between them will be minimum?

Distilled Water

Oil

Air

Vacuum

27 / 101

Electric flux Is positive when

Field lines are directed inwards

Field line are directed outwards

It does not depend on direction of field lines

None of these

28 / 101

What is farad of electricity?

A/s

6.02×10^23 electrons charge

Coulomb x volt

None of these

29 / 101

Two equal, opposite charges are fixed at a distance d. Positive charge is at the right and negative at the left position. As shown below:

X – Y + Z

At which position, the net electric field is directed to the left?

PMC Sample 2
Physics
Electrostatics
Elimination Tool:

A) X, Y and Z

B) X only

C) X and Z only

D) Y only

30 / 101

Unit of permittivity in free space is?

f/m

C/sec

31 / 101

What will be the change in potential energy if an electron moves 4.5m in the direction of an electric field of strength 325 N/C?

5.3 x I0 ^-16

2.3 x 10^16

Zero

32 / 101

Electron Volt is the unit of:

PMC Sample 1
Physics
Electrostatics
Elimination Tool:

A) Voltage

B) Current

C) Energy

D) Power

33 / 101

Which of the following can’t be used as a dielectric in a capacitor

Air

Wax

Iron

All of the above

34 / 101

A 2uF capacitor is connected to a 10 V dc supply, if ‘Q’ represents the charge on each plate and ‘E’ the energy stored on each plate, which of the following represents the values of Q and E?

NUMS 2019 Cancelled
Physics
Electrostatics
Elimination Tool:

A) Q = 20 uC and E = 50 ueV

B) Q = 10 uC and E = 100 eV

C) Q = 10 uC and E = 500 eV

D) Q = 20 uC and E = 100 uJ

35 / 101

A particle carrying charge of 2e falls through a potential difference of 3.0 V. Calculate energy acquired by it.

NTS 2015 DUHS and JSMU
Physics
Electrostatics
Elimination Tool:

A) 9.6 x 10-19J

B) 12.1 x 10-19J

C) 14.5 x 10-19J

D) 16.7 x 10-19J

36 / 101

Flux passing through an area does not depend upon

Medium

Shape of hypothetical surface

Numbers of line passing through the area

None of these

37 / 101

The greek word “xeros” and “graphos” means:

PMC Sample 2
Physics
Electrostatics
Elimination Tool:

A) sharp graphics

B) dry writing

C) wet writing

D) wet graphics

38 / 101

An electric rod of 2000 watts rating boils a certain quantity of water in 10 minutes, the heat which generated for boiling this water is:

NTS 2013
Physics
Electrostatics
Elimination Tool:

A) 8 x 10^4Joules

B) 12 x 10^5Joules

C) 19 x 10^5Joules

D) 23 x 10^5Joules

39 / 101

If the angle b/w electric field and vector area A is rr/3 then electric flux will be?

0.866 EA

0.5 EA

0.707 EA

EA/3

40 / 101

If 60 capacitors each of Capacitance C are connected in series and then in parallel what is the ratio of Cs/Cp=?

1/60

3600

1/3600

250

41 / 101

When wood is replaced by air as dielectric. The capacitance of capacitor

Increases

Decreases

Remains Constant

None

42 / 101

Which statement describes the electric potential difference between two points in the electric field of charge Q?

NTS 2019
Physics
Electrostatics
Elimination Tool:

A) The difference of electric field between the points per unit charge.

B) The ratio of the power dissipated between the points to the mass of charge

C) The work done in moving a test charge between points divided by the magnitude of the test charge.

D) The force required to move a unit positive charge between the points per unit charge.

43 / 101

60) What happens when a positive rod is placed near a neutral sphere?

Sphere is attracted towards rod and remains neutral

Sphere is attracted and negative charge is induced in it

Sphere is repelled and remains neutral

Sphere is repelled and positive charge is induced in it

44 / 101

If the potential difference between the plates of a capacitor with capacitance C is 4V, how much charge will accumulate on each of its plate?

45 / 101

The energy supplied by the cell to the charge carriers is derived from the conversion of:

NUMS 2016
Physics
Electrostatics
Elimination Tool:

A) Heat energy into chemical energy

B) Chemical energy Into electrical energy

C) Solar energy into electrical energy

D) Mechanical energy into electrical energy

46 / 101

In what form is the energy stored in a charged capacitor?

PMC 2020
Physics
Electrostatics
Elimination Tool:

A) gravitational

B) electrostatic field

C) magnetic field

D) potential

47 / 101

Two capacitors C1 = 3 uF and C2 = 6 uF are in series across a 90 volts D.C. supply. The total capacitance is given by:

NTS 2012
Physics
Electrostatics
Elimination Tool:

A) 9 uF

B) 2 uF

C) 10 uF

D) 90 uF

48 / 101

By increasing the area of the plates and decreasing the distance between them, the capacitance of a capacitor:

NUMS 2020
Physics
Electrostatics
Elimination Tool:

A) Increases

B) Decreases

C) Remains unchanged

D) Depending upon temperature

49 / 101

Ohm multiplied by farad is equivalent to:

PMC 2020
Physics
Electrostatics
Elimination Tool:

A) Time

B) Charge

C) Distance

D) Capacitor

50 / 101

Two capacitors C1 = 2μF and C2 = 4μF, are connected in series across a 100 V supply.

Find the effective capacitance:

NTS 2010
Physics
Electrostatics
Elimination Tool:

A) ½ μF

B) 3/2 μF

C) 5/2 μF

D) 4/3 μF

51 / 101

When some charge is given to a soap bubble it

Increases in size

Decreases In size

Remain same

None of these

52 / 101

If two point charges of charge q1 and q2 are placed at distance d. The force between them is proportional to:

PMC Sample 2
Physics
Electrostatics
Elimination Tool:

A) d

B) d^2

C) 1/d

D) 1/d^2

53 / 101

When two suspended objects are seem to attract each other electrically:

They are both charged

They are both uncharged

Either of them is charged

Both a and c

54 / 101

An electron is situated midway between two parallel plates 0.5 cm apart. One of the plates is maintained at a potential of 60 volts above the other. The force on the electron is (e = -1.6×10-19)

NTS 2011
Physics
Electrostatics
Elimination Tool:

A) 1.82×10-15 N

B) 3.00×10-16 N

C) 1.92×10-15N

D) 3.00×10-15N

55 / 101

Flux passing through an area does not depend upon

Charge enclosed

Shape of hypothetical surface

Medium

Both a and c

56 / 101

A charge is situated in the center of cube. The electric flux through one of the faces of the cube is.

Q/Eo

Q/2Eo

Q/4Eo

Ct/6Eo

57 / 101

What is the change in kinetic energy of a proton when it is accelerated through a potential difference of 2MV?

PMC Sample 1
Physics
Electrostatics
Elimination Tool:

A) 0.32 μJ

B) 0.32 nJ

C) 0.32 pJ

D) 0.32 fJ

58 / 101

If voltage of a capacitor is 60 v then what will be the voltage if diamond is present as •dielectric

Less than 60

More than 60

None of these

59 / 101

The energy stored in the capacitor is written as:

NUMS 2019 Cancelled
Physics
Electrostatics
Elimination Tool:

A) ½ CV2

B) ⅓ CV2

C) CV2

D) None of these

60 / 101

Electric intensity between two plates of a capacitor equals:

61 / 101

A proton Is moving in direction of negative x-axis, what will happen to it if potential difference of V = -10x + 7 is applied across the field.

Deflect upwards

Deflect downwards

Slow down

Speed up

62 / 101

Product of R and C is

Time

Mass

Current

Unit less

63 / 101

The unit of the product of RC in the charging of a capacitor Is:

Ohm

Farad

Second

None of the above

64 / 101

0.37q charge Is stored on the capacitor, what will be the current?

37%

63%

86%

None

65 / 101

What will be the new Surface Density if Electric Intensity is increased to 3 times?

9 a

a /3

3 a

a /27

66 / 101

If the potential at a point which is 1m from a charge is 1 volt, then the potential at a point which is 2m from the same charge will be:

PMC 2020
Physics
Electrostatics
Elimination Tool:

A) 2 V

B) 1 V

C) 0.5 V

D) 3 V

67 / 101

Energy stored in capacitors connected in parallel

Is more than capacitor connected in series

Is less than capacitor connected in series

Is equal to capacitor connected in series

Cannot he measured

68 / 101

If the electric field is E = x/y then y is?

Positive test charge

Negative charge

Force

None of these

69 / 101

The net charge flowing through any section of the conductor per unit time is known as?

NTS 2015 SMBBMC
Physics
Electrostatics
Elimination Tool:

A) Electric intensity

B) electric flux

C) electric current

D) electric potential

70 / 101

Ratio of Electrical Constant to Gravitational constant is approximately:

71 / 101

Two positive point charges are placed 2m apart. The electric potential at midpoint due to these two charges will be _____:

NUMS 2020
Physics
Electrostatics
Elimination Tool:

A) Added to double

B) Reduced to half

C) Remains same (no effect)

D) Cancel each other effect

72 / 101

For a proton moving in the direction of the electric field

its potential energy increases and its electric potential decreases

its potential energy Increases and its electric potential Increases

its potential energy decreases and It electric potential Increases

its potential energy decreases and its electric potential decreases

73 / 101

Electrical effects due to friction are studied in:

Electrostatics

Electrodynamics

Thermodynamics

Electrochemistry

74 / 101

The electric field of a point charge is in shape.

Spherical

Spherical symmetrical

Plane

Cylindrical

75 / 101

If a closed surface contains two equal and opposite The net electric flux from the surface will be

Positive

Negative

Zero

None of these

76 / 101

If we double the separation between two charges then coulomb’s force will become?

NUMS 2020
Physics
Electrostatics
Elimination Tool:

A) Doubled

B) Half

C) 4-times

D) 1/4th

77 / 101

The charge on neutron is:

NUMS 2018
Physics
Electrostatics
Elimination Tool:

A) 1.6 x 10-27C

B) Zero

C) 1.6 x 10-31C

D) 9.11 x 10-19C

78 / 101

If two point charges of charge q1 and q2 are placed at distance d, then the force between them is proportional to:

PMC Sample 1
Physics
Electrostatics
Elimination Tool:

A) q1 + q2

B) q1 – q2

C) q1/q2

D) q1 x q2

79 / 101

Value of ∊ _s is:

9 x 10^19

8.85 x 10^-12

9 x 10^-12

None

80 / 101

In E = F/Q, the charge is

Always positive

Always negative

Can be positive or negative

Charge less

81 / 101

e/m for an electron is ______, when the charge of an electron is 1.6 x 10-19C and mass of electron is 9.1 x 10-31kg.

NUMS 2019 Reconduct
Physics
Electrostatics
Elimination Tool:

A) 1.67 x 10-11C/kg

B) 1.76 x 1011C/kg

C) 16.7 x 1011C/kg

D) 1.76 x 10-11C/kg

82 / 101

What is true about the electric field and electric force?

NUMS 2016
Physics
Electrostatics
Elimination Tool:

A) Electric field lines are towards negative and electron flow in same direction

B) Electric field lines are towards positive and electron flow in opposite direction

C) Electric field lines are towards the negative and electrons flow in the opposite direction.

D) Electric field lines are positive and electrons flow in the same direction.

83 / 101

The total outward flux over any closed hypothetical surface called _____ is equal to the total charge enclosed divided by ε irrespective of how the charge is distributed.

NTS 2015 DUHS and JSMU
Physics
Electrostatics
Elimination Tool:

A) Coulomb surface

B) Gaussian surface

C) Ohm surface

D) Faraday surface

84 / 101

Q²/C has the units of?

Charge

Capacitance

Voltage

Energy

85 / 101

If a body A is charged with charge q, and is touched with neutral body B and then with neutral body C. What will be the charge on C after the contact?

q/2

q/3

q/4

86 / 101

SI unit of electric field is volt/meter which is equivalent to:

NUMS 2019 Reconduct
Physics
Electrostatics
Elimination Tool:

A) Newton meter

B) Newton / meter

C) Newton coulomb

D) Newton / coulomb

87 / 101

if electron is moving along positive x axis and where V= Sx*3 then it

Deflect down

Deflect up

Speed down

Speed up

88 / 101

If two charged conductors are joined by wire, then which of following will happen?

Current will start flowing between them

Current will flow from higher to lower potential

After some time, both will be at same potential

All of them

89 / 101

Unit of capacitance is:

Farad

Coulomb

Volt

Ohm

90 / 101

Energy stored in capacitor is represented by.

1/2qv

1/3qv

1/4qv

1/2vq2

91 / 101

An electron is placed between two charged plates the upper plate is positively charged and the lower plate is negative charged. The electron will

Deflect downwards

Deflect upwards

Go straight

None of these

92 / 101

Electron volt is the unit of

Energy

Voltage

emf

Conductance

93 / 101

A proton has mass m and charge q. It is suspended in electric and gravitational field. What is the magnitude of electric field?

PMC Sample 3
Physics
Electrostatics
Elimination Tool:

A) E = m*g / q

B) E = m*g / q*v

C) E = m*g / q*v*B

D) E = q / m*g

94 / 101

If the medium is changed from air to diamond what would be the effect in potential difference of a capacitor?

Decreases

Increases

Remains fame

Not possible

95 / 101

Two identical conducting spheres A and B carry equal charge Q. They are separated by a distance much larger than their diameters. A third identical conducting sphere C carries charge 2Q. Sphere C is first touched to A, then to I3, and finally removed. As a result, the electrostatic force between A and B, which was originally F, becomes:

F/2

15F/8

5F/7

2F/5

96 / 101

Three times decrease in the distance between the plates of a parallel plate capacitor will _______.

NTS 2019
Physics
Electrostatics
Elimination Tool:

A) Decrease the capacitance three times

B) Decrease the capacitance nine times

C) Increase the capacitance three times

D) Increase the capacitance six times

97 / 101

Two charges of same magnitude are placed, the force between the charges will be maximum in presence of which medium?

Glass

Water

Mica

Air

98 / 101

When a charge Q on a capacitor is doubled, then energy stored U will be:

NUMS 2020
Physics
Electrostatics
Elimination Tool:

A) 2U

B) 3U

C) U/2

D) 4U

99 / 101

A 10 nanofarad (10 x 10-9 F) parallel plate capacitor holds a charge of magnitude 50 µC on each plate.If the plates are separated by a distance of 0.885mm, what is the area of each plate?

NTS 2014
Physics
Electrostatics
Elimination Tool:

A) 1.0 m2

B) 3.0 m2

C) 5.5 m2

D) 7.5 m2

100 / 101

Two positive charges are separated by 3m. Another positive charge is placed between them. If the charge is moved along y axis the system will be in equilibrium

Stable

Unstable

Neutral

Depends on charge

101 / 101

Electric potential is a quantity.

Scalar

Vector

Basic

None of these

Your score is

The average score is 52%

5 responses to “Physics Electrostatics MCQs Chapter 1 Class 12”

Chand Ali says:

July 15, 2022 at 11:39 am

Good mcqs
Anonymous says:

November 3, 2022 at 2:08 pm

wrong answer its a scalar quantity
Anonymous says:

January 22, 2023 at 12:29 am

?❤️❤️✌️?
Anonymous says:

January 24, 2023 at 5:30 am

An electron is situated midway between two parallel plates 0.5 cm apart. One of the plates is maintained at a potential of 60 volts above the other. The force on the electron is (e = -1.6×10-19)
- M.jamshaid says:
  
  January 29, 2023 at 10:59 pm
  
  Please give us explanation of mcqs