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

In CRO, beam of electrons is focused by

A	Anode
B	Cathode
C	both a and c
D	Grid

Question 2

The current passing through a coil of galvanometer is given by

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

Question 3

Magnetic flux will be maximum when

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

Question 4

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

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

Question 5

The magnetic force is simply a

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

Question 6

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

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

Question 7

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

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

Question 8

The magnetic effect near the current carrying conductor was discovered by

A	Hans Oersted
B	Bohr
C	Faraday
D	Coulomb

Question 9

The brightness of the spot On CRO screen is controlled by

A	Cathode
B	Anode
C	Plates
D	Grid

Question 10

Cathode ray oscilloscope works by deflecting beam of

A	Electrons
B	Positrons
C	Protons
D	Neutrons

Question 11

Ampere's law can be used to calculate the_______field

A	Gravitational
B	Electric
C	All of these
D	Magnetic

Question 12

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

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

Question 13

A charge projected in the direction of magnetic field experiences

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

Question 14

A high speed graph plotting device is

A	CRO
B	Television
C	AVO meter
D	All of these

Question 15

Magnetic flux will be minimum when

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

Question 16

Ammeter is a

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

Question 17

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

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

Question 18

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

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

Question 19

Two parallel straight wires carrying currents in opposite direction

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

Question 20

The SI units of magnetic permeability is

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

Question 21

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

A	Twice
B	Six times
C	Four times
D	Half

Question 22

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	0.15 Weber
B	0.50 Weber
C	1.5 Weber
D	1.0 Weber

Question 23

Lorentz force is given by

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

Question 24

A current carrying wire is surround by

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

Question 25

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	At 60° to the field
C	Parallel to the field
D	Perpendicular to field

Question 26

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 27

The magnetic field outside the solenoid due to current is

A	Strong
B	Weak
C	Zero
D	Uniform

Question 28

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

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

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	ev/B
B	e/vB
C	Zero
D	evB

Question 30

Magnetic field inside a long solenoid is

A	Non-uniform
B	Negligible
C	Uniform
D	Circular

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

Question 32

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

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

Question 33

The direction of lines of force depends upon the direction of

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

Question 34

Magnetic flux per unit area perpendicular to magnetic field is called

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

Question 35

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

A	V²/Br
B	B/vr
C	B²/vr
D	V/Br

Question 36

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

A	Neutrons
B	Radiations
C	Protons
D	Electrons

Question 37

A long tightly wound cylindrical coil of wire is called

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

Question 38

A galvanometer is converted into an ammeter by connecting a suitable

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

Question 39

The working of all electrical instruments depends upon

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

Question 40

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

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

Question 41

A magnetic field is always set up due to

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

Question 42

In CRO the grid is at _______potential with respect to cathode

A	None of these
B	Negative
C	Zero
D	Positive

Question 43

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

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

Question 44

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 45

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

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

Question 46

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

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

Question 47

The electron, gun in CRO consists of

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

Question 48

In western type galvanometer, the jeweled bearings are used produced

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

Question 49

Sensitivity of Galvanometer can he increased by increasing

A	B
B	A
C	All of these
D	N

Question 50

The Working of a galvanometer depends upon

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

Question 51

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

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

Question 52

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

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

Question 53

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

A	Air
B	An alloy
C	Steel
D	Soft iron

Question 54

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

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

Question 55

The current passing through coil of the galvanometer is

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

Question 56

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

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

Question 57

An ammeter only can be used in________ in a circuit

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

Question 58

Torque necessary to produce unit twist is called

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

Question 59

SI unit of magnetic flux is

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

Question 60

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

A	αparticle
B	βparticle
C	Electron
D	Neutron

Question 61

In galvanometer the rectangular coil is made up of

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

Question 62

The unit of magnetic flux is

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

Question 63

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

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

Question 64

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

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

Question 65

In a galvanometer, the enameled copper wire is wound on

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

Question 66

Sensitivity of galvanometer is given by

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

Question 67

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

A	Mass
B	Energy
C	Direction of motion
D	Speed

Question 68

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

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

Question 69

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

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

Question 70

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

A	None of these
B	Unchanged
C	Zero
D	Changed

Question 71

CRO is used for displaying the wave form of a given

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

Question 72

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

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

Question 73

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

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

Question 74

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

A	Rough
B	Fluorescent
C	Polished
D	Clear

Question 75

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

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

Question 76

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

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

Question 77

The e/m of an electron can be expressed as

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

Question 78

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 79

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

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

Question 80

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

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

Question 81

Two parallel straight wires carrying currents in same direction

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

Question 82

A device used for the detection of current is called

A	Voltmeter
B	Ammeter
C	Galvanometer
D	AVO meter

Question 83

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

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

Question 84

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

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

Question 85

The grid in CRO

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

Question 86

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

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

Question 87

One tesla is equal to

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

Question 88

Magnetic force performs

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

Question 89

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

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

Question 90

Charge to mass ratio of neutron is__________ that of electron

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

Question 91

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

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

Question 92

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

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

Question 93

An ideal ammeter has ________resistance

A	100MΩ
B	None of these
C	Zero
D	Infinite

Question 94

One tesla is equal to

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

Question 95

The SI unit of magnetic induction is

A	Coulomb
B	Gauss
C	Weber
D	Tesla

Question 96

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

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

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

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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.