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

An ideal ammeter has ________resistance

A	100MΩ
B	Infinite
C	Zero
D	None of these

Question 2

In galvanometer the rectangular coil is made up of

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

Question 3

The current passing through a coil of galvanometer is given by

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

Question 4

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

Question 5

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

A	Electrons
B	Protons
C	Neutrons
D	Radiations

Question 6

Charge to mass ratio of neutron is__________ that of electron

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

Question 7

Magnetic field inside a long solenoid is

A	Circular
B	Uniform
C	Non-uniform
D	Negligible

Question 8

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

A	Air
B	An alloy
C	Soft iron
D	Steel

Question 9

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

A	Fluorescent
B	Polished
C	Clear
D	Rough

Question 10

The direction of lines of force depends upon the direction of

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

Question 11

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 12

CRO is used for displaying the wave form of a given

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

Question 13

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

A	Changed
B	None of these
C	Zero
D	Unchanged

Question 14

Ammeter is a

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

Question 15

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

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

Question 16

A long tightly wound cylindrical coil of wire is called

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

Question 17

The Working of a galvanometer depends upon

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

Question 18

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

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

Question 19

In CRO the grid is at _______potential with respect to cathode

A	Positive
B	Zero
C	Negative
D	None of these

Question 20

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 21

Torque necessary to produce unit twist is called

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

Question 22

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	Distance from the conductor
D	Current passing through the conductor

Question 23

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

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

Question 24

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

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

Question 25

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

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

Question 26

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

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

Question 27

A device used for the detection of current is called

A	AVO meter
B	Galvanometer
C	Ammeter
D	Voltmeter

Question 28

SI unit of magnetic flux is

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

Question 29

The magnetic force is simply a

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

Question 30

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

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

Question 31

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

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

Question 32

The e/m of an electron can be expressed as

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

Question 33

One tesla is equal to

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

Question 34

An ammeter only can be used in________ in a circuit

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

Question 35

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

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

Question 36

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

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

Question 37

The current passing through coil of the galvanometer is

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

Question 38

Sensitivity of galvanometer is given by

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

Question 39

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

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

Question 40

Magnetic flux per unit area perpendicular to magnetic field is called

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

Question 41

In western type galvanometer, the jeweled bearings are used produced

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

Question 42

The SI unit of magnetic induction is

A	Weber
B	Coulomb
C	Gauss
D	Tesla

Question 43

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

A	Half
B	Twice
C	Six times
D	Four times

Question 44

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

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

Question 45

Magnetic flux will be maximum when

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

Question 46

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

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

Question 47

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 48

Magnetic force performs

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

Question 49

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

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

Question 50

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	Remain same
D	Changes at every instant

Question 51

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

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

Question 52

Ampere's law can be used to calculate the_______field

A	Electric
B	Magnetic
C	All of these
D	Gravitational

Question 53

The grid in CRO

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

Question 54

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

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

Question 55

Two parallel straight wires carrying currents in opposite direction

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

Question 56

Magnetic flux will be minimum when

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

Question 57

A current carrying wire is surround by

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

Question 58

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

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

Question 59

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 60

A high speed graph plotting device is

A	AVO meter
B	Television
C	All of these
D	CRO

Question 61

The magnetic effect near the current carrying conductor was discovered by

A	Hans Oersted
B	Bohr
C	Faraday
D	Coulomb

Question 62

The brightness of the spot On CRO screen is controlled by

A	Plates
B	Anode
C	Cathode
D	Grid

Question 63

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

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

Question 64

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

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

Question 65

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

A	αparticle
B	Electron
C	βparticle
D	Neutron

Question 66

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

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

Question 67

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

A	Energy
B	Direction of motion
C	Speed
D	Mass

Question 68

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

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

Question 69

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

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

Question 70

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

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

Question 71

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

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

Question 72

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

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

Question 73

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

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

Question 74

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

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

Question 75

The electron, gun in CRO consists of

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

Question 76

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

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

Question 77

A galvanometer is converted into an ammeter by connecting a suitable

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

Question 78

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

Question 79

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

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

Question 80

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	0.50 Weber
D	1.0 Weber

Question 81

Sensitivity of Galvanometer can he increased by increasing

A	A
B	All of these
C	B
D	N

Question 82

The magnetic field outside the solenoid due to current is

A	Strong
B	Zero
C	Weak
D	Uniform

Question 83

Lorentz force is given by

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

Question 84

The working of all electrical instruments depends upon

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

Question 85

In a galvanometer, the enameled copper wire is wound on

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

Question 86

Cathode ray oscilloscope works by deflecting beam of

A	Positrons
B	Neutrons
C	Protons
D	Electrons

Question 87

A charge projected in the direction of magnetic field experiences

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

Question 88

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

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

Question 89

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

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

Question 90

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	4 N
D	1.5 N

Question 91

The SI units of magnetic permeability is

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

Question 92

One tesla is equal to

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

Question 93

In CRO, beam of electrons is focused by

A	Cathode
B	Anode
C	Grid
D	both a and c

Question 94

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

Question 95

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

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

Question 96

The unit of magnetic flux is

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

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