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
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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