GRADE 12 - PHYSICS CHAPTER NO.3 ELECTROMAGNETISM Test No.1 Online MCQs MDCAT, UHS, PMC & ECAT Preparation

GRADE 12 – PHYSICS CHAPTER NO.3 ELECTROMAGNETISM Test No.1 Online MCQs MDCAT, UHS, PMC & ECAT Preparation

PHYSICS – 2nd Year
Chapter Name : ELECTROMAGNETISM
Chapter No. 3 / 14 [ Test No.1 ]
Multiple Choice Questions
Note : All MCQ’s selected in this test are from OLD F.Sc. board , UHS and PMC(Pakistan Medical Commission) Islamabad Papers.

Book Name : PHYSICS
Chapter No. 3 / 14 (Test No. 1)
Chapter Name : ELECTROMAGNETISM
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.3 ELECTROMAGNETISM Test No.1

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GRADE 12 - PHYSICS CHAPTER NO.3 ELECTROMAGNETISM Test No.1

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Question 1

A charge projected in the direction of magnetic field experiences

A	No force
B	Finite force
C	None of these
D	Maximum force

Question 2

Ammeter is a

A	Infinite resistance galvanometer
B	High resistance galvanometer
C	Intermediate resistance galvanometer
D	Low, resistance galvanometer

Question 3

If the current passing through a wire in a magnetic field is halved the magnetic force would become

A	Four times
B	Half
C	Six times
D	Twice

Question 4

Total number of lines of magnetic induction passing through any surface placed perpendicular to the field is called:

A	Magnetic induction
B	Self inductance
C	Flux density
D	Magnetic flux

Question 5

When the coil of the galvanometer is in equilibrium; then the deflecting couple is

A	Smaller than the restoring couple
B	Equal to the restoring couple
C	Zero
D	Greater than the restoring couple

Question 6

Which of the following particle moving in the magnetic field cannot be deflected

A	Neutron
B	Electron
C	βparticle
D	αparticle

Question 7

A galvanometer is converted into an ammeter by connecting a suitable

A	High resistance in series with the galvanometer
B	Low resistance in series with 'the galvanometer
C	Low resistance in parallel with the galvanometer
D	High resistance in parallel with the galvanometer

Question 8

The galvanometer can be made sensitive if the value of the factor BAN/C is

A	Made small
B	Made larger
C	Remains constant
D	None or these

Question 9

The mathematical expression Σ [(B^→). (l^→)] = (µ₀I) is known as

A	Gauss's law
B	Lenz's law
C	Faradays law
D	Ampere's law

Question 10

Magnetic flux density due to current carrying conductor can be determined by

A	Gauss's law
B	Faraday's law
C	Coulomb's law
D	Ampere's law

Question 11

Sensitivity of Galvanometer can he increased by increasing

A	All of these
B	A
C	N
D	B

Question 12

When a charged particle moves through a magnetic field, the effect of the field, changes the particle's

A	Speed
B	Energy
C	Direction of motion
D	Mass

Question 13

Cathode ray oscilloscope works by deflecting beam of

A	Positrons
B	Protons
C	Electrons
D	Neutrons

Question 14

The magnetic field at a point due to a current carrying conductor is directly proportional to

A	Resistance of the conductor
B	Thickness of the conductor
C	Current passing through the conductor
D	Distance from the conductor

Question 15

The waveform produced by sweep or time base generator in CRO is

A	Sine wave
B	Saw tooth wave
C	None of these
D	Square wave

Question 16

When an electron enters in a magnetic field, right angle to its motion. then the magnitude of velocity will be

A	Unchanged
B	None of these
C	Zero
D	Changed

Question 17

When a current carrying conductor is placed in a uniform magnetic field, it experience a force which is given by

A	F^? = I(L^?. B^?)
B	None of these
C	F^? = I(L^? x B^?)
D	F^? = (IL^?)/(B^?)

Question 18

In CRO the x-plates deflect the beam of electrons _________ on screen

A	Horizontally
B	Parallel to the X axis
C	Both a and c
D	Vertically

Question 19

The magnetic field outside the solenoid due to current is

A	Strong
B	Zero
C	Weak
D	Uniform

Question 20

Magnetic flux will be minimum when

A	None of these
B	Magnetic field is at an angle of 45℉ with surface area
C	Magnetic field lies parallel to the plane of area
D	Magnetic field lies perpendicular to the plane of area

Question 21

The galvanometer in which the coil comes to rest quickly after the current passed through it, is called

A	Both a and b
B	Sensitive Galvanometer
C	Dead beat galvanometer
D	Stable galvanometer

Question 22

The magnetic force experienced by a charge particle is zero, when charge particle is projected at

A	Θ = 90°
B	Θ = 120°
C	Θ = 45°
D	Θ = 0°

Question 23

When charged particle is projected perpendicular to a uniform magnetic field its trajectors is

A	A circle
B	An ellipse
C	Straight line
D	None of these

Question 24

The magnetic force experienced by a chai.ge particle is maximum, when charge particle is projected at

A	Θ = 180°
B	Θ = 0°
C	Θ = 45°
D	Θ = 90°

Question 25

The current passing through coil of the galvanometer is

A	None of these
B	Directly proportional square of the angle of defection
C	Directly proportional to the angle of deflection
D	Inversely proportional to the angle of deflection

Question 26

Magnetic field inside a long solenoid is

A	Non-uniform
B	Circular
C	Negligible
D	Uniform

Question 27

If current is passing through a wire, lines of force near it are

A	Inclined to the wire
B	In the shape of concentric circles
C	Parallel to the wire
D	Perpendicular to the wire

Question 28

The current passing through a coil of galvanometer is given by

A	I = [C/BAN](Θ)
B	I = [NAC/B](Θ)
C	I = [BAN/C](Θ)
D	I = [BAN/C](Θ)

Question 29

If an electron enters the perpendicular magnetic field with a velocity v^→ it will experience a force which is given by F=

A	Zero
B	e/vB
C	evB
D	ev/B

Question 30

Minimum current required to produce a deflection of one mm on a scale at a distance of 1 meter is

A	1 ampere
B	Current sensitivity
C	1 coulomb
D	1 ohm

Question 31

The force experienced by a single charge carrier moving with velocity V^→ in a magnetic field of strength B^→ is given by

A	F_? = q(V_? x B_?)
B	F_? = q(V_?-B_?)
C	F^? = q(V^?. B^?)
D	F_? = q(V_?+B_?)

Question 32

The magnetic field in a certain region is given by (B^→) = (40i^{^})-(18j^{^}). How much flux passes a 5.0 cm² area loop in this region if the loop lies hate in the xy-plane

A	Zero
B	200 x 10^-4 Wb
C	110 x 10^-4 Wb
D	90 x 10^-4 Wb

Question 33

CRO is used for displaying the wave form of a given

A	AC voltage
B	None of these
C	Both a and b
D	DC voltage

Question 34

Torque necessary to produce unit twist is called

A	Restoring torque
B	Deflecting torque
C	Torsional torque
D	All of these

Question 35

One tesla is equal to

A	1N^-1 Am^-1
B	1N A^-1m
C	1 N A^-1 m^-1
D	1 NAm(^-1)

Question 36

The SI units of magnetic permeability is

A	Weber
B	Weber/m(²)
C	Weber/Am²
D	Weber/Am

Question 37

Which of the, following is most suitable for the core of an electromagnet?

A	Air
B	Soft iron
C	Steel
D	An alloy

Question 38

The relation between current I and the angle of deflection in a moving coil galvanometer is:

A	I ∝ I/Θ
B	I ∝ Θ
C	I ∝ sinΘ
D	I ∝ cosΘ

Question 39

The Working of a galvanometer depends upon

A	Material of the coil
B	Torque produced in the coil
C	Mass of the coil
D	Electric force exerted on the coil

Question 40

Sensitivity of galvanometer is given by

A	BN/CA
B	BAN/C
C	CA/BN
D	C/BAN

Question 41

A high speed graph plotting device is

A	Television
B	CRO
C	AVO meter
D	All of these

Question 42

Magnetic field along the axis of a solenoid with N turns carrying a current I is given by

A	B = (µ_°) I/(n)
B	B = (µ_°)/(NI)
C	B = µ_° NI
D	B = µ_°nI

Question 43

Ampere's law can be used to calculate the_______field

A	Magnetic
B	All of these
C	Electric
D	Gravitational

Question 44

The working of all electrical instruments depends upon

A	All of these
B	Magnetic effect of current
C	Heating effect of current
D	Chemical effect of current

Question 45

In CRO the grid is at _______potential with respect to cathode

A	Positive
B	None of these
C	Zero
D	Negative

Question 46

Magnetic flux will be maximum when

A	Magnetic field is perpendicular to. The plane area
B	None of these
C	Area is held at an angle of 45℉
D	Magnetic field lies parallel to the plane area

Question 47

In a moving coil galvanometer, the deflecting. Torque depends upon

A	Number of turns of coil
B	Value of magnetic field I
C	Area of the coil
D	All of these

Question 48

In a galvanometer, the enameled copper wire is wound on

A	An iron frame
B	Magnetic material
C	Non-magnetic material
D	An insulator

Question 49

Two parallel straight wires carrying currents in same direction

A	Have no effect upon each other
B	Attract each other
C	They cancel 'out their individual magnetic fields
D	Repel each other

Question 50

A current carrying conductor experiences maximum magnetic force in a uniform magnetic field when it-is placed

A	Parallel to the field
B	At an angle of 60℉ to the field
C	Perpendicular to the field
D	At an angle of 180℉ to the field

Question 51

In e/m experiment, the path of the electron can be made visible by filling glass tube with

A	O₂ gas at high pressure
B	Air at low pressure
C	H₂ gas at high pressure
D	H₂ gas at low pressure

Question 52

Charge to mass ratio of neutron is__________ that of electron

A	Greater then
B	None of these
C	Equal to
D	Less-then

Question 53

The electron, gun in CRO consists of

A	All of these
B	Indirectly heated cathode
C	Grid
D	Filament

Question 54

The magnetic effect near the current carrying conductor was discovered by

A	Bohr
B	Hans Oersted
C	Coulomb
D	Faraday

Question 55

In CRO when cathode is .heated by a filament, it emits

A	Electrons
B	Radiations
C	Protons
D	Neutrons

Question 56

A 0.50 T field over an area of 2 (m²) which lies at an angle of 30^° to the field, the magnetic flux is

A	1.5 Weber
B	0.15 Weber
C	1.0 Weber
D	0.50 Weber

Question 57

The direction of lines of force depends upon the direction of

A	Both of these
B	None of these
C	Current
D	Flux

Question 58

The e/m of an electron can be expressed as

A	e/m = 2V/Br
B	e/m = 2V/Br²
C	e/m = V/2Br
D	e/m = 2V/B²V²

Question 59

The force Experienced by a charge particle is maximum if it moves

A	None of these
B	Perpendicular to magnetic field
C	Opposite to magnetic field
D	Parallel to magnetic field

Question 60

Lorentz force is given by

A	F_? = q[([(V^?+B^?))+E^?]]
B	F_? = q[([(V^?.B^?))+E^?]]
C	F_? = q[([(V^? x B^?))+E^?]]
D	F_? = q[([(V^?.B^?))(E^?)]]

Question 61

The beam of electrons in CRO is deflected when they pass through uniform

A	Gravitational field
B	All of these
C	Magnetic field
D	Electric field

Question 62

In galvanometer, the restoring couple of the suspension wire is proportional to the angle of deflection as long as the wire obeys

A	Hook's lam,
B	Ampere's lass
C	Faraday's law
D	Lenz's law

Question 63

The unit of magnetic flux is

A	Weber
B	Weber-m^-2
C	Gauss
D	Weber-m²

Question 64

Which one of the following field is suitable choice for circular trajector of a charged partical

A	Electric field
B	Magnetic field
C	Gravitational field
D	All of the above

Question 65

The working of galvanometer depends upon torque on a current carrying coil in

A	All of these
B	Magnetic field
C	Electric field
D	Gravitational field

Question 66

Charge to mass ratio (e/m) of a proton is_________ that of electron

A	None of these
B	Equal to
C	Greater then
D	Less then

Question 67

A long tightly wound cylindrical coil of wire is called

A	Toroid
B	Both of these
C	None of these
D	Solenoid

Question 68

The SI unit of magnetic induction is

A	Coulomb
B	Weber
C	Gauss
D	Tesla

Question 69

A device used for the detection of current is called

A	Voltmeter
B	AVO meter
C	Ammeter
D	Galvanometer

Question 70

In galvanometer the coil is situated in the magnetic field such that the plane of the coil is always

A	At 45° to the field
B	Perpendicular to field
C	Parallel to the field
D	At 60° to the field

Question 71

In SI units, the value of permeability of free space (μ) is

A	4Π x 10^-7 Wb A^-1m^-1
B	4Π x 10⁹ Wb A^-1m^-1
C	4Π x 10^-9 Wb A^-1m^-1
D	4Π x 10⁷ Wb A^-1 m^-1

Question 72

The grid in CRO

A	None of these
B	Controls the brightness of spot formed on screen
C	Controls the number or electrons by cathode
D	Both (a) and (b)

Question 73

In galvanometer the rectangular coil is made up of

A	Enameled steel wire
B	Iron wire
C	None of these
D	Enameled copper wire

Question 74

A current carrying wire is surround by

A	Gravitational field
B	Both electric field and magnet field
C	Magnetic field only
D	Electric field only

Question 75

CRO when beam of electrons falls on screen; it makes a visible spot because the screen is

A	Polished
B	Rough
C	Fluorescent
D	Clear

Question 76

A magnetic field is always set up due to

A	Motion of magnet
B	All of these
C	Motion of charge
D	Static electric charge

Question 77

Two parallel straight wires carrying currents in opposite direction

A	Repel each other
B	They cancel out their individual magnetic fields
C	Attract each other
D	Have no effect upon each other

Question 78

An ammeter only can be used in________ in a circuit

A	Both series and parallel
B	None of these
C	Parallel
D	Series

Question 79

One tesla is equal to

A	1 Wb m²
B	1 Wb m^-1
C	1 Wb m^-2
D	1Wb m

Question 80

When current passes through a solenoid coil, it behaves like a

A	Bar magnet
B	None of these
C	North pole
D	Circular magnet

Question 81

Magnetic flux per unit area perpendicular to magnetic field is called

A	Self-induction
B	Self induction
C	Mutual induction
D	Flux density

Question 82

The magnetic force is simply a

A	Lorentz force
B	Deflecting. Force
C	All of these
D	Restoring force

Question 83

The brightness of the spot On CRO screen is controlled by

A	Grid
B	Cathode
C	Anode
D	Plates

Question 84

An ideal ammeter has ________resistance

A	Infinite
B	Zero
C	None of these
D	100MΩ

Question 85

In CRO, beam of electrons is focused by

A	Cathode
B	Grid
C	Anode
D	both a and c

Question 86

When charged particle enters perpendicular in magnetic field, it moves in

A	Circular path
B	Straight path
C	None of these
D	Helical path

Question 87

SI unit of magnetic flux is

A	NA m^-1
B	Nm A^-1
C	Nm A^-2
D	Nm²A^-1

Question 88

A 5 meter wire carrying a current of 2 A is at right angles to the uniform magnetic field of 0.5 weber/(m² The force on the wire is

A	2N
B	5 N
C	1.5 N
D	4 N

Question 89

The sensitivity of a moving coil galvanometer can be, increased by

A	Decreasing the area of the coil
B	Both b & c
C	Increasing the magnetic field
D	Decreasing the number of turns o coil

Question 90

In a straight current carrying conductor, the direction of magnetic field can be found by

A	All of these
B	Left hand rule
C	Right hand rule
D	Head to tail rule

Question 91

Magnetic force performs

A	Maximum
B	None of these
C	Negative work
D	No work

Question 92

In western type galvanometer, the jeweled bearings are used produced

A	Deflecting torque
B	Both a and b
C	Restoring torque
D	None

Question 93

In velocity selector a charged particle will go undeflecting if V is equal to

A	B/E
B	EB
C	E/B
D	E- B

Question 94

The magnitude of the deflecting torque on a current carrying coil in

A	τ = NIBA tanα
B	Zero
C	τ = NIBA cosα
D	τ = NIBA sinα

Question 95

The e/m of an electron moving in a circular path in a magnetic field is given by

A	B²/vr
B	V/Br
C	B/vr
D	V²/Br

Question 96

When an electron enters in a perpendicular magnetic field of its motion. then direction of its motion

A	Remain same
B	Becomes parallel to the Field
C	None of these
D	Changes at every instant

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