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

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

Question 2

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

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

Question 3

Sensitivity of galvanometer is given by

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

Question 4

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

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

Question 5

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	Low resistance in parallel with the galvanometer
D	High resistance in parallel with the galvanometer

Question 6

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

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

Question 7

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_?-B_?)
D	F_? = q(V_? x B_?)

Question 8

Magnetic field inside a long solenoid is

A	Non-uniform
B	Negligible
C	Uniform
D	Circular

Question 9

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

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

Question 10

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

Question 11

A high speed graph plotting device is

A	All of these
B	AVO meter
C	Television
D	CRO

Question 12

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

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

Question 13

The brightness of the spot On CRO screen is controlled by

A	Grid
B	Cathode
C	Anode
D	Plates

Question 14

Magnetic force performs

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

Question 15

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

A	Polished
B	Fluorescent
C	Clear
D	Rough

Question 16

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

A	V/Br
B	B²/vr
C	B/vr
D	V²/Br

Question 17

One tesla is equal to

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

Question 18

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

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

Question 19

Two parallel straight wires carrying currents in opposite 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 20

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

A	αparticle
B	βparticle
C	Neutron
D	Electron

Question 21

The magnetic effect near the current carrying conductor was discovered by

A	Faraday
B	Coulomb
C	Hans Oersted
D	Bohr

Question 22

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

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

Question 23

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 24

A long tightly wound cylindrical coil of wire is called

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

Question 25

The current passing through coil of the galvanometer is

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

Question 26

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	At 60° to the field
D	Parallel to the field

Question 27

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

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

Question 28

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

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

Question 29

In western type galvanometer, the jeweled bearings are used produced

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

Question 30

The e/m of an electron can be expressed as

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

Question 31

A magnetic field is always set up due to

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

Question 32

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

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

Question 33

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

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

Question 34

The direction of lines of force depends upon the direction of

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

Question 35

Sensitivity of Galvanometer can he increased by increasing

A	A
B	N
C	All of these
D	B

Question 36

The working of all electrical instruments depends upon

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

Question 37

The SI unit of magnetic induction is

A	Coulomb
B	Tesla
C	Gauss
D	Weber

Question 38

The SI units of magnetic permeability is

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

Question 39

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

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

Question 40

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 41

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

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

Question 42

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 43

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 44

Cathode ray oscilloscope works by deflecting beam of

A	Electrons
B	Positrons
C	Protons
D	Neutrons

Question 45

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

Question 46

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

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

Question 47

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

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

Question 48

Magnetic flux per unit area perpendicular to magnetic field is called

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

Question 49

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

A	Mass
B	Energy
C	Speed
D	Direction of motion

Question 50

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

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

Question 51

SI unit of magnetic flux is

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

Question 52

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

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

Question 53

A device used for the detection of current is called

A	AVO meter
B	Galvanometer
C	Ammeter
D	Voltmeter

Question 54

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

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

Question 55

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

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

Question 56

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 57

CRO is used for displaying the wave form of a given

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

Question 58

Ammeter is a

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

Question 59

An ideal ammeter has ________resistance

A	100MΩ
B	Infinite
C	Zero
D	None of these

Question 60

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

A	Protons
B	Neutrons
C	Radiations
D	Electrons

Question 61

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 62

The electron, gun in CRO consists of

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

Question 63

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

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

Question 64

Charge to mass ratio of neutron is__________ that of electron

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

Question 65

The magnetic force is simply a

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

Question 66

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 67

One tesla is equal to

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

Question 68

Torque necessary to produce unit twist is called

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

Question 69

The magnetic field outside the solenoid due to current is

A	Weak
B	Strong
C	Zero
D	Uniform

Question 70

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

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

Question 71

Two parallel straight wires carrying currents in same direction

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

Question 72

An ammeter only can be used in________ in a circuit

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

Question 73

In CRO the grid is at _______potential with respect to cathode

A	None of these
B	Positive
C	Zero
D	Negative

Question 74

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

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

Question 75

In CRO, beam of electrons is focused by

A	both a and c
B	Cathode
C	Anode
D	Grid

Question 76

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

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

Question 77

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

A	Steel
B	An alloy
C	Soft iron
D	Air

Question 78

A charge projected in the direction of magnetic field experiences

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

Question 79

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

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

Question 80

The current passing through a coil of galvanometer is given by

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

Question 81

In a galvanometer, the enameled copper wire is wound on

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

Question 82

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 83

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	1.0 Weber
C	1.5 Weber
D	0.50 Weber

Question 84

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

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

Question 85

The grid in CRO

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

Question 86

The unit of magnetic flux is

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

Question 87

The Working of a galvanometer depends upon

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

Question 88

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

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

Question 89

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

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

Question 90

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

A	Four times
B	Twice
C	Six times
D	Half

Question 91

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	1.5 N
B	4 N
C	5 N
D	2N

Question 92

Magnetic flux will be minimum when

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

Question 93

Ampere's law can be used to calculate the_______field

A	Electric
B	Gravitational
C	Magnetic
D	All of these

Question 94

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	Changed
D	Zero

Question 95

In galvanometer the rectangular coil is made up of

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

Question 96

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

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

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