GRADE 12 - PHYSICS CHAPTER NO.3 ELECTROMAGNETISM Test No.2 Online MCQs MDCAT, UHS, PMC & ECAT Preparation

GRADE 12 – PHYSICS CHAPTER NO.3 ELECTROMAGNETISM Test No.2 Online MCQs MDCAT, UHS, PMC & ECAT Preparation

PHYSICS – 2nd Year
Chapter Name : ELECTROMAGNETISM
Chapter No. 3 / 14 [ Test No.2 ]
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. 2)
Chapter Name : ELECTROMAGNETISM
Total MCQ from Text Book : 95
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 : 95
Total Time : 47 minutes 30 Seconds

GRADE 12 - PHYSICS CHAPTER NO.3 ELECTROMAGNETISM Test No. 2

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GRADE 12 - PHYSICS CHAPTER NO.3 ELECTROMAGNETISM Test No. 2

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Question 1

The unit of magnetic flux is

A	Tesla
B	Tesla²
C	Weber
D	Weber m^-2

Question 2

The ray which remain undeflected in a magnetic field is

A	βRays
B	αrays
C	Cathode rays
D	γRays

Question 3

An electron is moving in -a circle of radius r in a uniform magnetic field B. Suddenly the field is reduced to The radius of circle now becomes

A	r/4
B	4r
C	r/2
D	2r

Question 4

AVOmeter basically consists of

A	Ammeter
B	Ohmmeter
C	Moving coil galvanometer
D	Voltmeter

Question 5

A 2Mev proton is moving perpendicular to a uniform magnetic field of 2.5T. Which of the following is the magnetic force on proton?

A	2.5 x 10^-10N
B	2.5 x 10^-11N
C	8 x 10^-12N
D	8 x10^-11N

Question 6

A device which can measure current, potential difference and resistance is called

A	Ohmmeter
B	AVO meter
C	Ammeter
D	Volt meter

Question 7

The sensitivity of galvanometer is given by

A	C/BAN
B	BAN/C
C	B/CAN
D	CAN/B

Question 8

A voltmeter is an electrical instrument which is used to measure

A	Resistance
B	All of these
C	Potential difference
D	Current

Question 9

A current carrying loop is placed in a uniform magnetic field. The torque acting on it, does not depend upon

A	Current of the loop
B	Shape of loop
C	Area of loop
D	Magnetic field

Question 10

DMM stands for

A	None of these
B	Digital multimeter
C	Digit measuring Meter
D	Digital millimeter

Question 11

Magnetic effect of current was discovered by

A	Kirchhoff
B	Faraday
C	Joule
D	Oersted

Question 12

The magnetic flux B is equal to

A	B^? x A^?
B	BA sinΘ
C	B^?.A^?
D	B/A

Question 13

One Tesla is equal to

A	NA^-1m^-1
B	N^-1Am
C	NA^-1m
D	ANm^-1

Question 14

1 Tesla =

A	1NA^-1m^-1
B	1N^-1Am^-2
C	N^-1Am
D	1 N^-1Am^-1

Question 15

In order to measure potential difference voltmeter is always connected in

A	Both A and B
B	Series
C	Neither is series nor in parallel
D	Parallel

Question 16

The charges moving perpendicular to magnetic field experience force

A	Zero
B	Maximum
C	Infinite
D	Minimum

Question 17

Lorentz force is given by

A	q(V^?+E^? x B^?)
B	q(E^?-V^? x B^?)
C	q[E^?×(V^?+B^?)]
D	q(E^?+V^? x B^?)

Question 18

A horizontal wire of 10cm and mass 0.3gm carries a current of 5A. Which of the following is the magnitude of the magnetic field that can support the weight of wire?

A	3 x 10^-4T
B	6 x 10^-4T
C	3 x 10^-3T
D	6 x 10^-3T

Question 19

A voltmeter is always connected in circuit in

A	Series
B	Both a and b
C	Parallel
D	None of these

Question 20

1 tesla is equal to

A	1Nm^-7 A^-7
B	1Nm^-2A^-1
C	1NmA^-1
D	1Nm^-7

Question 21

Two parallel wire carrying current in the same direction attract each other because of

A	Magnetic force between them
B	Potential difference between them
C	Mutual inductance between them
D	Electric force between them

Question 22

Which is the correct relation

A	IT = 10²G
B	IT = 10^-4G
C	IT = 10⁴G
D	IT = 10^-2G

Question 23

The number of electrons on CRO is controlled by

A	X deflecting plates
B	Grid
C	Y deflecting plates
D	Filament

Question 24

The resistance of an ideal ammeter

A	Small
B	Zero
C	High
D	Infinite

Question 25

The magnetic force is simply a

A	Deflecting force
B	Reflecting force
C	Restoring force
D	Gravitational force

Question 26

Total Flux through a closed surface depends on

A	Shape of Surface
B	Medium Only
C	Charge and Medium
D	Charge enclosed only

Question 27

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

A	I∝cosΘ
B	I∝Θ
C	I∝sinΘ
D	I∝(I/Θ)

Question 28

The brightness of the spot on CRO screen is controlled by

A	Cathode
B	Grid
C	Anode
D	Plates

Question 29

A current flows in a conductor from east to west. The direction of the magnetic field at a point above the conductor is towards

A	West
B	South
C	East
D	North

Question 30

In a current carrying long solenoid the magnetic filed produced does not depend upon

A	Current flowing through solenoid
B	The radius of solenoid
C	All of the above three
D	Number of turns per unit length

Question 31

The radius of curvature of the path of charged particle in a uniform magnetic field is directly proportional the

A	Intensity of magnetic field
B	Momentum of particle
C	Charge an particle
D	Energy of particle

Question 32

The brightness of spot in CRO is controlled by

A	Deflecting plates
B	Grid
C	Anode
D	Cathode

Question 33

The SI unit of magnetic induction is

A	Weber
B	Tesla
C	Newton
D	Gauss

Question 34

In case of conversion of galvanometer into ammeter the shunt resistance is connected

A	In series
B	Neither parallel nor series
C	In parallel and In series
D	In parallel

Question 35

The effective way to increase the sensitivity of moving coil galvanometer is

A	Increase the value of constant
B	Increase the number of Turns
C	Increase the area of Coil
D	Increase the magnetic field

Question 36

The galvanometer can be made sensitive by making the factor BAN/C

A	Constnt
B	Zero
C	Large
D	Small

Question 37

If 0.5 T filled over an area of 2(m²) which lies at an angle of 60^° with field. Then the resulting flux will he

A	0.25T
B	0.25 Wb
C	0.50 web
D	0.50 T

Question 38

Galvanometer can be converted into voltmeter by connecting a high resistance in:

A	Parallel as well as series with the galvanometer
B	Parallel with galvanometer
C	Series with galvanometer
D	None of these

Question 39

When an electron is entered in a magnetic field, The magnitude of velocity of electron

A	Increases
B	Depend on field strength
C	Decrease
D	Is independent of field strength

Question 40

Torque on a current carrying coil is given by

A	τ = NIABsinα
B	τ = NWABcosα
C	τ = NIABcosα
D	τ = NWABsinα

Question 41

Energy stored per unit volume inside a solenoid is called

A	Energy density
B	Work
C	Volume Charge density
D	Electric flux

Question 42

One Tesla is equal to

A	NA^-1m
B	N^-1Am^-1
C	N Am
D	NAm^-1

Question 43

The brightness of the spot on CRO screen is controlled by

A	Cathode
B	Deflecting Plates
C	Anode
D	Grid

Question 44

If a high resistance is connected in series with the galvanometer the resulting instrument is called

A	A potentiometer
B	An ammeter
C	A voltmeter
D	An AVO meter

Question 45

A power line lies along east-west direction and carries a current of 10A. Which of the following is the force Per meter due to earth's magnetic-field of 10^-4 tesla?

A	10 ³N
B	10 ⁴N
C	10 ⁵N
D	10 ² N

Question 46

The sensitivity of a galvanometer can be, increased by

A	Using a fine suspension
B	Increasing the magnetic field
C	Decreasing the number of turns of coil
D	Decreasing the area of the coil

Question 47

Voltmeter of range IV has a resistance of 1000?. To extend the range to 10V the additional series required is

A	1000Ω
B	10000Ω
C	9000Ω
D	11000Ω

Question 48

Which of the following in motion can not be deflected by magnetic field?

A	Electron
B	Sodium ion
C	Proton
D	Neutron

Question 49

Emf is induced due to change in

A	Charge
B	Electric field
C	Magnetic flux
D	Current

Question 50

A charged particle enters at 30^° to the magnetic field Its path becomes

A	Elliptical
B	Straight line
C	Circular
D	Helical

Question 51

In order to increase sensitivity galvanometer the value of C may by

A	Neither increase nor decrease
B	Decrease
C	Increase
D	Remains same

Question 52

The SI unit of electric flux is:

A	N mC²
B	Nm^-2C^-2
C	N mC^-2
D	NC m^-2

Question 53

If a charge is at rest in a magnetic field then force on charge is

A	Zero
B	q VB cosΘ
C	q VB sinΘ
D	q(V^? x B^?

Question 54

Force on a charged particle is zero when projected at angle with the magnetic field

A	180°
B	90°
C	0°
D	270°

Question 55

An electron and a proton enter a magnetic field with same velocity. Which of the following is the ratio of the acceleration

A	(√m_e / m_p
B	√m_p / m_e
C	m_p / m_e
D	m_e / m_p

Question 56

The sum of electric and magnetic force is called

A	Maxwell force
B	Centripetal force
C	Newton's force
D	Lorentz force

Question 57

The CRO is used for

A	Displaying the wave form of given vibration
B	Displaying the wave form of frequency
C	Converting A.C into D.C
D	Displaying wave form of given voltage

Question 58

The e/m of a neutron is

A	Zero
B	Less than electron
C	Greater than electron
D	The same as electron

Question 59

A magnet drops down a long vertical copper tube. As it falls down the tube its velocity

A	None of above
B	Remain constant
C	Decrease
D	Increase

Question 60

A charged particle moves along a circle under the action of possible electric and magnetic fields. Which of the following is possible

A	E = 0 B = 0
B	E = 0, B≠
C	E≠0 B≠0
D	E≠0 B = 0

Question 61

The S.I unit of magnetic flux is given by

A	NmA^-1
B	Nm² A^-1
C	Nm^-7 A^-7
D	Nm^-1 A

Question 62

To convert a-galvanometer into an ammeter, of range I ampere the shunt resistance is given by

A	R_s = (I- I_g)/(I_gR_g)
B	R_s = (I_gR_g)/(I-I_g)
C	R_s = (I_gR_g)/(I+I_g)
D	R_s = (I- I_g)/(I_gR_g)

Question 63

Brightness of screen of CRO controlled by

A	Cathode
B	Anode
C	Filament
D	Grid

Question 64

Useful device to measure resistance current and voltage is an electronic instrument called

A	Voltmeter
B	Digital Multimeter
C	Ohmmeter
D	Ammeter

Question 65

Two parallel wires carrying current in the same direction:

A	Repel each other
B	Cancel their fields
C	Attract each other
D	No effect on each other

Question 66

In order to increase the range of voltmeter, the series resistance is

A	Kept constant
B	Increased
C	Decreased
D	Sometimes increased and sometimes decreased

Question 67

Torque is produced in a current carrying coil when it is placed in a

A	Magnetic field
B	Electric field
C	Gravitational field
D	Nuclear field

Question 68

The high resistance Rh to convert a galvanometer into a voltmeter is Rh=

A	(V/I_g)-(R_g)
B	(R_gg)
C	(I_g)/(I-I_g)
D	(V/I_g)+(R_g)

Question 69

A strong magnetic field is applied to a stationary electron then

A	Electron move in the direction of field
B	Electron start spinning
C	Electron remain stationary
D	Electron move opposite to the field

Question 70

Two parallel straight wires carrying current in same direction will

A	May repel or attract
B	No effect
C	Repel each other
D	Attract each other

Question 71

A magnetic needle is kept in a non-uniform magnetic field it experience

A	A force and a torque
B	Neither a force nor a torque
C	Force but not torque
D	Torque but not force

Question 72

In order to increase the range of an ammeter, the shunt resistance is

A	Sometimes is increased and sometimes decreased
B	Kept constant
C	Decreased
D	Increased

Question 73

The brightness of spot on CRO screen is controlled by

A	Plates
B	Anode
C	Cathode
D	Grid

Question 74

The resistance of ideal voltmeter is

A	Zero
B	Very high
C	Very low
D	Infinite

Question 75

A charged particle enters in a strong magnetic field its k.E.

A	Increases
B	Remain constant
C	Increases then Decreses
D	Decreases

Question 76

If a high resistance is connected in series to a galvanometer, then galvanometer is converted into

A	Voltmeter
B	Ammeter
C	Ohmmeter
D	Multimeter

Question 77

The value of permeability of free space µ₀ is given by

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

Question 78

A proper combination of a galvanometer and a series of resistance acts as

A	Ohmmeter
B	Ammeter
C	Digital Multimeter
D	Voltmeter

Question 79

Proton and a - particle moving with same velocity enter a magnetic field perpendicularly. Which of the following is the ratio of radius of proton to a - particle

A	2
B	2-Jan
C	4
D	1

Question 80

The sensitivity of galvanometer is given by

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

Question 81

A uniform magnetic field is represented by a set of lines of force which are

A	None of these
B	Parallel
C	Divergent
D	Convergent

Question 82

Shunted galvanometer is called

A	Ammeter
B	Ohm meter
C	Potentiometer
D	Voltmeter

Question 83

A charged particle moves through a magnetic field in a direction perpendicular to it. Which of the following remain unchanged for the partical

A	Direction
B	Velocity
C	Acceleration
D	Speed

Question 84

If a long hollow copper pipe carries a direct current The magnetic field due to current will be

A	Neither inside nor outside the pipe
B	Both inside and outside the pipe
C	Only inside the pipe
D	Only outside the pipe

Question 85

When a charge is projected perpendicular to a uniform magnetic field, its path is

A	Circular
B	Helix
C	Spiral
D	Ellipse

Question 86

The magnetic force is

A	Restoring force
B	Lorentz force
C	Electric force
D	Deflecting force

Question 87

A voltmeter is always connected in

A	Perpendicular
B	Parallel
C	Straight line
D	Series

Question 88

An avometer can also be called as

A	Digital ammeter
B	Digital multimeter
C	Digital ohm-meter
D	Digital voltmeter

Question 89

If the number of turns become double but length remain same, then magnetic field in the solenoid become:

A	Half
B	Zero
C	Remain same
D	Double

Question 90

The brightness of spot in CRO is controlled by

A	Grid
B	Deflecting Plates
C	Anode
D	Cathode

Question 91

The sensitivity of galvanometer is given by

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

Question 92

The value of e/m is smallest for

A	Positrons
B	Electron
C	Proton
D	B-particals

Question 93

A charged particle is moving in uniform magnetic field in a circle. The radius of circular path is R. If q nervy of particle is doubled then the new radius will be

A	R/√2
B	R/2
C	√2R
D	2R

Question 94

An electron enters the magnetic field at right angle from left B is into paper. The electron will be deflected

A	Towards left
B	Downwards
C	Upward
D	Towards right

Question 95

The unit of Magnetic Flux

A	Nm^-1A^-1
B	NmA
C	NmA^-1
D	Nm^-1A

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