PHYSICS Chapter No. 01 ELECTROSTATICS 2nd Year Online MCQs MDCAT & ECAT Preparation Test No.2

PHYSICS
Chapter Name : ELECTROSTATICS
Chapter No. 01 [Test No.2]
2st Year
Multiple Choice Questions

Book Name : PHYSICS
Chapter No. 01 (Test No.2)
Chapter Name : ELECTROSTATICS
Total MCQ from Text Book : 96
Book Version : 2020
Published By : Punjab Text Book Board Lahore
Approved By : Govt of the Punjab and Federal Ministry for Education
Test Type : MCQ’s
Exam conduct By : Inter Boards of Sindh, KPK, Balochistan, AJK, Gilgit Baltistan, Punjab & Federal
Class / Grade : 12 ( F.Sc. Intermediate)
Total Marks : 96
Total Time : 48 minutes

GRADE 12 - PHYSICS CHAPTER NO.1 ELECTROSTATICS Test No.2

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GRADE 12 - PHYSICS CHAPTER NO.1 ELECTROSTATICS Test No.2

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Question 1

If 2?F and 4?F capacitors are connected in series, the resultant capacitance is

A	1.3μF
B	8μF
C	6μF
D	0.5μF

Question 2

An ECG records the_______between points on human skin generated by electric process in the heart:

A	Hert Beat
B	Voltage
C	Pulse Rate
D	Pressure

Question 3

The electron volt is the unit of

A	Potential
B	Electric current
C	Electric energy
D	Potential difference

Question 4

The unit of Electric intensity other than NC^-1 is:

A	V/C
B	V/A
C	N/V
D	V/m

Question 5

The concept of electric field theory was introduced by

A	Coulomb
B	Joseph-Henry
C	Faraday
D	Einstein

Question 6

SI unit of electric flux is:

A	Nm³ c²
B	Nm² c^-1
C	Nm^-1 c^-1
D	Nmc^-1

Question 7

SI unit of permittivity of free space are:

A	Nm²C^-2
B	C²N^-1m^-2
C	C²N^-1m^-1
D	N^-1m²C^-1

Question 8

Selenium is:

A	Conductor in dark
B	Insulator in dark
C	Insulator in light
D	Semiconductor in dark

Question 9

Due to polarization, electric field E

A	Decreases
B	First increase then decrease
C	Increases
D	Remains same

Question 10

The magnitude of an electric field E, such that an electron placed in it would be experience an electric force equal to its weight, is given by

A	me/g
B	mg/e
C	mge
D	e/mg

Question 11

If a charged capacitor is connected to earth its charge.

A	Increase
B	Decrease
C	None of above
D	Remain same

Question 12

If time constant in RC circuit is small, the capacitor is charged or discharged

A	Slowly
B	None of these
C	Rapidly
D	At constant Rate

Question 13

Selenium is a:

A	Insulator
B	Conductor
C	Photoconductor
D	Semiconductor

Question 14

If a metal plate is placed between two point charges then electrostatic force between them.

A	Decrease
B	Become zero
C	Increase
D	Remain constant

Question 15

The force between two point charges separated by air is 4 N. When separated by a medium of relative permittivity 2, the force between them becomes;

A	8N
B	1/2 N
C	2N
D	4N

Question 16

Which material sheet should be placed between the plates of a parallel plate capacitor in order to increase its capacitance?

A	Copper
B	Tin
C	Mica
D	Iron

Question 17

The capacitance of a capacitor can be increased by

A	Increasing the distance between plates
B	Increasing the area of the plates
C	Placing dielectric between them
D	Both a & b

Question 18

A parallel plate capacitor with oil between the plate(?_r = 2) has a capacitance "C". If oil is removed then capacitance of capacitor becomes.

A	C
B	√2C
C	C/√2
D	C/2

Question 19

Electric field and electric potential inside hollow charged conducting sphere are respectively.

A	0, 1/4π ε_ο q/r²
B	Non zero, zero
C	1/4π ε_ο q/r², 1/4π ε_ο q/r
D	Zero, non zero

Question 20

Capacitance of a Capacitor in Vacuum is given by

A	A/ε_οd
B	Aε_r /d
C	Ad/ε_ο
D	Aε₀/d

Question 21

Photocopier and inkjet printer are the application of:

A	Magnetism
B	Electro-magnetism
C	Electrostatics
D	Electricity

Question 22

The energy stored in the capacitor is:

A	Gravitational P.E
B	K.E
C	Electric K.E
D	Electric P.E

Question 23

If 2?F and 4?F capacitors are connected in parallel, the resultant capacitance is

A	8μF
B	0.5μF
C	6μF
D	1.3μF

Question 24

Electron volt is the unit of

A	Potential
B	Potential difference
C	Electric current
D	Electric energy

Question 25

Time constant is defined as the time during which a capacitor charges to_____ of its equilibrium value.

A	63%
B	Both a and b
C	0.63%
D	37%

Question 26

The Electrostatic force between two charges is 42 N. If we place a dielectric of er.=2.1 between the charges, then the force become equal to:

A	2 N
B	88.2 N
C	20 N
D	42 N

Question 27

Capacitance of a capacitor does not depend upon:

A	Area of plates
B	Distance between plates
C	Medium between plates
D	Electric field between plates

Question 28

One electron volt is equal to

A	1.6 x 10^-19 Coulomb
B	1.6 x 10^-19 Joul
C	1.6 x 10^-18 Joul
D	1.6 x 10^-19 N

Question 29

Two copper spheres of same radii one hollow and other solid are charged to the same potential then.

A	Both will hold same charge
B	Hollow can not be charged
C	Hollow will hold more charge
D	Solid will hold more charge

Question 30

The energy stored in a charged capacitor is given by:

A	1/2 CV²
B	1/2 QV²
C	1/2 C²V
D	1/2 Q²V

Question 31

Selenium is a:

A	Insulator
B	First insulator then Conductor
C	Conductor
D	Photoconductor

Question 32

The number of electrons in one coulomb charge is equal to

A	6.25 x 10^-18
B	1.6 x 10^-19
C	6.25 x 10¹⁸
D	1.6 x 10¹⁹

Question 33

Two charges 1 ?c and 5?c separated by 20cm, the ratio of electrical forces acting on them will be:

A	5 : 1
B	1 : 1
C	1 : 2
D	1 : 5

Question 34

A 1?F capacitor is subjected to 4000V potential difference the energy stored in capacitor is:

A	16J
B	12 x 10^3/sup>J
C	4 x 10^-3/sup>J
D	8J

Question 35

If a dielectric is placed between the plates of a capacitor, its capacitance

A	Increases
B	Remains constant
C	None of these
D	Decreases

Question 36

For computation of electric flux, the surface area should be

A	Parallel
B	Spherical
C	Curved
D	Flat

Question 37

One Joule is equal to

A	6.25 x 10^-19 eV
B	6.25 x 10¹⁹ eV
C	6.25 x 10¹⁸ eV
D	6.25 x 10^-18 eV

Question 38

Which one of the following can be taken as measure of electric field intensity:

A	F/A
B	φ ε_o/A
C	qA/ε_o
D	φe/A

Question 39

Charge on electron is:

A	1.6 x 10¹⁹ C
B	1.6 x 10¹⁷ C
C	1.6 x 10^-17 C
D	1.6 x 10^-19 C

Question 40

Two opposite point charge of same magnitude separated by distance 2d, electric potential mid-way between them is:

A	1V
B	Zero
C	V/2
D	2 V

Question 41

The electric flux through closed surface depends upon.

A	Charge and medium
B	Charge
C	Geometry
D	Medium

Question 42

Due to polarization of the dielectric, the electric intensity between the plates of a capacitor:

A	Decreases
B	Increases
C	Becomes zero
D	Remain constant

Question 43

A parallel plate capacitor is first charged and then a dielectric slab is introduced between the plates. Which of the following quantity remain unchanged?

A	Charge
B	Energy
C	Potential
D	Capacity

Question 44

The toner of the printer is given

A	Negative charge
B	First positive then negative
C	Positive charge
D	Neutral

Question 45

Due to polarization of the dielectric, the capacitance of the capacitor:

A	Increases
B	Decreases
C	Remain constant
D	Becomes zero

Question 46

A metallic ball having charge 10^-8C moves from a point A at potential 600V to a point B at zero potential. Which of the following is the change in its K.E.

A	6 x 10^-6 J
B	6 x 10^-6 erg
C	-6 x 10⁶ J
D	6 x 10⁶ J

Question 47

If the medium between plates of a capacitor be air or vacuum, then the capacitance of capacitor is:

A	2Aε_ο / d
B	Ad / ε_ο
C	Aε_ο / 2d
D	Aε_ο / d

Question 48

The electrostatic force of repulsion between two electrons at a distance 1m is:

A	2.3 x 10^-26N
B	2.3 x 10^-28N
C	2.3 x 10^-24N
D	2.3 x 10^-30N

Question 49

Photocopier and inkjet printer are the application of:

A	Electricity
B	Electronics
C	Magnetism
D	Electrostatics

Question 50

A capacitor is charged to store energy U. the charging battery is disconnected. An identical capacitor is now connected in parallel to the first capacitor. The energy in each capacitor is

A	U/4
B	3U/2
C	U
D	U/2

Question 51

When air is replaced by a dielectric medium of relative permittivity ?r, the maximum capacity of the condenser_____

A	Increase ε² _r times
B	Decrease ε_r times
C	increase ε_r times
D	Remains unchanged

Question 52

The product of resistance and capacitance is equal to

A	Velocity
B	Force
C	Current
D	Time

Question 53

The value of ?_o permittivity for free space is:

A	8.85 x 10^-12m²N^-1 C²
B	8.85 x 10^-12NmC^-2
C	8.85 x 10^-12Nm²C^-2
D	8.85 x 10^-12C² N^-1 m^-2

Question 54

The product of resistance and capacitance is called

A	Velocity
B	Time
C	Current
D	Force

Question 55

If the separation between the plates of a capacitor is doubled then its capacitance become

A	Three times
B	One fourth
C	Half
D	Double

Question 56

Which of the following is not the energy stored between the plates of a condenser?

A	U = qV/2
B	U = CV²/2
C	U = 2qV
D	U = q²/2C

Question 57

Doubling the distance between the plates of a capacitor, the capacitance:

A	Increases to double
B	Remains constant
C	Decreases to one - fourth
D	Decreases to half

Question 58

Relative permittivity for air is:

A	1.0006
B	1.06
C	1.6
D	1.006

Question 59

Which one of the following relations for the energy stored in capacitor is not correct?

A	1/2 QV
B	None of these
C	1/2 CV²
D	1/2 Q² / C

Question 60

The constant of proportionality "K" depend upon:

A	Nature of medium between two charges
B	The system of units
C	Nature of charge bodies
D	Nature of medium between two charges and system of units

Question 61

An alpha particle is accelerated through potential difference of 10⁶V.Which of the following is its K.E?

A	4 MeV
B	1 MeV
C	2 MeV
D	8 MeV

Question 62

Capacitance of parallel plate capacitor is:

A	6.25 x 10^-18 eV
B	1.6 x 10¹⁹ eV
C	1.6 x 10^-19 eV
D	6.25 x 10¹⁸ eV

Question 63

A Particle carrying a charge of 2e falls through a potential difference of 3V. The energy acquired by it will be:

A	6 eV
B	1.5 eV
C	0.66 eV
D	3 eV

Question 64

The value of Coulomb's constant (K) in SI units is

A	9 x 10⁹N^-1m²C²
B	9 x 10⁹Nm²C^-2
C	9 x 10⁹Nm²C²
D	9 x 10⁹NC²m^-2

Question 65

1 ohm x 1 farad is equal to

A	1 joule
B	1 ampere
C	1 coulomb
D	1 second

Question 66

The product of resistance and capacitance is

A	Acceleration
B	Velocity
C	Time
D	Force

Question 67

Two charges q₁ and q₂ are placed in vacuum at distance d and force between them is F. If a mentioned of relative permittivity 4 is introduced between them then new force will be:

A	F/4
B	F/2
C	4F
D	2F

Question 68

A charge Q is enclosed in a dielectric of strength K the maximum number of electric lines of force are

A	Zero
B	Q/ε₀
C	Q/Kε₀
D	Infinite

Question 69

For computation of electric flux, the surface area should be

A	Flat
B	Parallel
C	Curved
D	Spherical

Question 70

A charge Q is divided into two parts q₁ and q₂. The maximum coulomb repulsion between the two parts is obtained when ratio q₁/q₂ is.

A	1
B	1/4
C	2/3
D	1/2

Question 71

The number of electrons in one coulomb charge is equal to:

A	6.25 x 10¹⁹
B	1.6 x 10^-19
C	6.25 x 10¹⁸
D	6.25 x 10^-19

Question 72

The electric field lines are closer where the field is:

A	Strong
B	Uniform
C	Weak
D	Variable

Question 73

If the potential difference across the two plates of a parallel plate capacitor is double then its energy stored in it will be:

A	16 times
B	4 times
C	2 times
D	Remain same

Question 74

When dielectric is placed between the plates of capacitor, The value of E between the plates

A	Infinite
B	Zero
C	Decrease
D	Increase

Question 75

Two equal and opposite equal charges separated by small distance are said to make a :

A	Insulator
B	Super conductor
C	LED
D	Dipole

Question 76

The relation "-?V/?r" represents

A	Electric intensity
B	Gauss's Law
C	Electric flux
D	Potential difference

Question 77

If an insulating material called dielectric is introduced between the plates, the capacitance of capacitor is:

A	Aε_οε_r / 2d
B	Aε_οε_r / d
C	2Aε_οε_r / d
D	Ad / ε_οε_r

Question 78

A charged conductor has charge on its:

A	Inner-surface
B	Surrounding space
C	Outer-surface
D	Middle point

Question 79

Charge on an electron is:

A	1.6 x 10^-19 C
B	9.1 x 10^-19 C
C	1.6 x 10⁺¹⁹ C
D	9.1 x 10^-27 C

Question 80

When 10¹⁴ electron are removed from a neutral metal sphere then which of the following is the charge on sphere?

A	16μC
B	-16μC
C	32μC
D	-32μC

Question 81

Three capacitor of 4?F each are to be connected in such a way that the net capacitance is 6?F. Then

A	Connect two in series and one in parallel
B	All the these three be in parallel
C	All the these three be in series
D	Connect two in parallel and one in series

Question 82

The work done in bringing a unit positive charge from infinity to that point in an electric field is called:

A	Potential
B	All of these
C	Absolute potential
D	Potential difference

Question 83

Two point charges are +2C and +6C repel each other with a force of 12N. If a charge of -4C is given to each of these charges, the force now is

A	Zero
B	4N atttactive
C	4N repulsion
D	12N attractive

Question 84

In a charged capacitor, the energy resides in:

A	Both the negative and positive plates
B	The field between the plates
C	The negative plate
D	The positive plate

Question 85

Which of the following is the dielectric constant of metals?

A	Zero
B	Greater than one but finite
C	Infinity
D	One

Question 86

Electric intensity inside the hollow sphere is:

A	1/ε₀
B	Zero
C	σ/2ε₀
D	σ/ε₀

Question 87

If potential difference across two plates of a parallel plates capacitor is doubled then the energy stored in it will be

A	4-times
B	2-times
C	Remain same
D	8-times

Question 88

The force between two similar unit charges placed one meter apart in air is:

A	One Newton
B	9 x 10⁹ N
C	Zero
D	9 x 10^-9 N

Question 89

Dielectric constant ?_r can be defined as

A	C_vac + C_med
B	C_med/C_vac
C	C_vac/C_med
D	C_med - C_vac

Question 90

The product of resistance and capacitance is

A	Time
B	Velocity
C	Acceleration
D	Force

Question 91

If a charged body is moved against the electric field, it will gain:

A	Electrical potential energy
B	K.E
C	Mechincal energy
D	P.E

Question 92

When electron is brought near a - vely charged plate then its electrical P.E.

A	Remain same
B	Decrease
C	Increase
D	Become zero

Question 93

If f₁ and ₂ are forces acting on ?-particle and electron respectively, when

A	F_{1_{= 4F₂}}
B	F_{1_{= F₂}}
C	F_{1_{> F₂}}
D	F_{1_{< F₂}}

Question 94

4 x 10²⁰ eV energy is required to move a charge of 0.25 C from A to B the potential difference between A and B is

A	178 V
B	400 V
C	256 V
D	356 V

Question 95

Special organ called Ampullae of lorenzini that are very sensitive to electric field are found in

A	Sharks
B	Cats
C	Doges
D	Bats

Question 96

The electric field created by positive charge is:

A	Radially inward
B	Zero
C	Radially Outward
D	Circular

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