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
GRADE 12 - PHYSICS CHAPTER NO.3 ELECTROMAGNETISM Test No. 2
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Question 1 |
Energy stored per unit volume inside a solenoid is called
A | Energy density |
B | Electric flux |
C | Volume Charge density |
D | Work |
Question 2 |
When a charge is projected perpendicular to a uniform magnetic field, its path is
A | Circular |
B | Helix |
C | Spiral |
D | Ellipse |
Question 3 |
Force on a charged particle is zero when projected at angle with the magnetic field
A | 180° |
B | 0° |
C | 90° |
D | 270° |
Question 4 |
The number of electrons on CRO is controlled by
A | X deflecting plates |
B | Filament |
C | Y deflecting plates |
D | Grid |
Question 5 |
1 tesla is equal to
A | 1Nm-7 A-7 |
B | 1Nm-7 |
C | 1NmA-1 |
D | 1Nm-2A-1 |
Question 6 |
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-Jan |
B | 1 |
C | 4 |
D | 2 |
Question 7 |
Which is the correct relation
A | IT = 104G |
B | IT = 10-2G |
C | IT = 10-4G |
D | IT = 102G |
Question 8 |
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 | 2r |
D | r/2 |
Question 9 |
The brightness of the spot on CRO screen is controlled by
A | Anode |
B | Grid |
C | Plates |
D | Cathode |
Question 10 |
Lorentz force is given by
A | q(E?+V? x B?) |
B | q[E?×(V?+B?)] |
C | q(E?-V? x B?) |
D | q(V?+E? x B?) |
Question 11 |
In order to increase sensitivity galvanometer the value of C may by
A | Remains same |
B | Decrease |
C | Neither increase nor decrease |
D | Increase |
Question 12 |
1 Tesla =
A | N-1Am |
B | 1NA-1m-1 |
C | 1 N-1Am-1 |
D | 1N-1Am-2 |
Question 13 |
The effective way to increase the sensitivity of moving coil galvanometer is
A | Increase the magnetic field |
B | Increase the area of Coil |
C | Increase the number of Turns |
D | Increase the value of constant |
Question 14 |
In order to increase the range of voltmeter, the series resistance is
A | Decreased |
B | Kept constant |
C | Increased |
D | Sometimes increased and sometimes decreased |
Question 15 |
The SI unit of magnetic induction is
A | Newton |
B | Weber |
C | Tesla |
D | Gauss |
Question 16 |
The resistance of an ideal ammeter
A | Infinite |
B | High |
C | Small |
D | Zero |
Question 17 |
The unit of magnetic flux is
A | Tesla |
B | Weber m-2 |
C | Tesla2 |
D | Weber |
Question 18 |
Which of the following in motion can not be deflected by magnetic field?
A | Sodium ion |
B | Electron |
C | Proton |
D | Neutron |
Question 19 |
Magnetic effect of current was discovered by
A | Kirchhoff |
B | Joule |
C | Faraday |
D | Oersted |
Question 20 |
A current carrying loop is placed in a uniform magnetic field. The torque acting on it, does not depend upon
A | Shape of loop |
B | Area of loop |
C | Current of the loop |
D | Magnetic field |
Question 21 |
The SI unit of electric flux is:
A | N mC2 |
B | N mC-2 |
C | NC m-2 |
D | Nm-2C-2 |
Question 22 |
In case of conversion of galvanometer into ammeter the shunt resistance is connected
A | Neither parallel nor series |
B | In series |
C | In parallel |
D | In parallel and In series |
Question 23 |
A charged particle enters at 30° to the magnetic field Its path becomes
A | Elliptical |
B | Helical |
C | Circular |
D | Straight line |
Question 24 |
The brightness of spot in CRO is controlled by
A | Grid |
B | Anode |
C | Deflecting plates |
D | Cathode |
Question 25 |
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 2 N |
B | 10 4N |
C | 10 3N |
D | 10 5N |
Question 26 |
An electron and a proton enter a magnetic field with same velocity. Which of the following is the ratio of the acceleration
A | √mp / me |
B | me / mp |
C | (√me / mp |
D | mp / me |
Question 27 |
A magnet drops down a long vertical copper tube. As it falls down the tube its velocity
A | Increase |
B | Decrease |
C | Remain constant |
D | None of above |
Question 28 |
A charged particle moves through a magnetic field in a direction perpendicular to it. Which of the following remain unchanged for the partical
A | Velocity |
B | Direction |
C | Speed |
D | Acceleration |
Question 29 |
If a high resistance is connected in series to a galvanometer, then galvanometer is converted into
A | Ammeter |
B | Voltmeter |
C | Multimeter |
D | Ohmmeter |
Question 30 |
An avometer can also be called as
A | Digital multimeter |
B | Digital voltmeter |
C | Digital ohm-meter |
D | Digital ammeter |
Question 31 |
The charges moving perpendicular to magnetic field experience force
A | Minimum |
B | Infinite |
C | Zero |
D | Maximum |
Question 32 |
AVOmeter basically consists of
A | Moving coil galvanometer |
B | Voltmeter |
C | Ohmmeter |
D | Ammeter |
Question 33 |
A proper combination of a galvanometer and a series of resistance acts as
A | Voltmeter |
B | Ohmmeter |
C | Ammeter |
D | Digital Multimeter |
Question 34 |
If the number of turns become double but length remain same, then magnetic field in the solenoid become:
A | Double |
B | Remain same |
C | Zero |
D | Half |
Question 35 |
One Tesla is equal to
A | ANm-1 |
B | N-1Am |
C | NA-1m |
D | NA-1m-1 |
Question 36 |
The relation between current I and angle of deflection ? in a moving coil galvanometer is
A | I∝sinΘ |
B | I∝(I/Θ) |
C | I∝cosΘ |
D | I∝Θ |
Question 37 |
The value of e/m is smallest for
A | B-particals |
B | Positrons |
C | Proton |
D | Electron |
Question 38 |
The S.I unit of magnetic flux is given by
A | Nm-1 A |
B | Nm2 A-1 |
C | NmA-1 |
D | Nm-7 A-7 |
Question 39 |
A voltmeter is always connected in
A | Parallel |
B | Series |
C | Straight line |
D | Perpendicular |
Question 40 |
Two parallel wire carrying current in the same direction attract each other because of
A | Potential difference between them |
B | Mutual inductance between them |
C | Electric force between them |
D | Magnetic force between them |
Question 41 |
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 = 0 |
C | E = 0, B≠ |
D | E = 0 B = 0 |
Question 42 |
Voltmeter of range IV has a resistance of 1000?. To extend the range to 10V the additional series required is
A | 10000Ω |
B | 9000Ω |
C | 11000Ω |
D | 1000Ω |
Question 43 |
Shunted galvanometer is called
A | Potentiometer |
B | Voltmeter |
C | Ohm meter |
D | Ammeter |
Question 44 |
A uniform magnetic field is represented by a set of lines of force which are
A | None of these |
B | Divergent |
C | Parallel |
D | Convergent |
Question 45 |
The radius of curvature of the path of charged particle in a uniform magnetic field is directly proportional the
A | Momentum of particle |
B | Charge an particle |
C | Intensity of magnetic field |
D | Energy of particle |
Question 46 |
The resistance of ideal voltmeter is
A | Infinite |
B | Zero |
C | Very high |
D | Very low |
Question 47 |
The magnetic force is
A | Deflecting force |
B | Lorentz force |
C | Electric force |
D | Restoring force |
Question 48 |
The e/m of a neutron is
A | Greater than electron |
B | Less than electron |
C | The same as electron |
D | Zero |
Question 49 |
In order to increase the range of an ammeter, the shunt resistance is
A | Sometimes is increased and sometimes decreased |
B | Decreased |
C | Kept constant |
D | Increased |
Question 50 |
The brightness of spot on CRO screen is controlled by
A | Anode |
B | Cathode |
C | Grid |
D | Plates |
Question 51 |
The magnetic flux B is equal to
A | BA sinΘ |
B | B/A |
C | B?.A? |
D | B? x A? |
Question 52 |
The sensitivity of galvanometer is given by
A | BAN/C |
B | BN/CA |
C | C/BAN |
D | CAN/B |
Question 53 |
Total Flux through a closed surface depends on
A | Charge enclosed only |
B | Shape of Surface |
C | Charge and Medium |
D | Medium Only |
Question 54 |
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 | 0.50 T |
B | 0.25T |
C | 0.50 web |
D | 0.25 Wb |
Question 55 |
A voltmeter is an electrical instrument which is used to measure
A | Potential difference |
B | Current |
C | All of these |
D | Resistance |
Question 56 |
The magnetic force is simply a
A | Gravitational force |
B | Reflecting force |
C | Restoring force |
D | Deflecting force |
Question 57 |
In order to measure potential difference voltmeter is always connected in
A | Parallel |
B | Both A and B |
C | Series |
D | Neither is series nor in parallel |
Question 58 |
The CRO is used for
A | Displaying the wave form of frequency |
B | Displaying wave form of given voltage |
C | Converting A.C into D.C |
D | Displaying the wave form of given vibration |
Question 59 |
DMM stands for
A | None of these |
B | Digital millimeter |
C | Digit measuring Meter |
D | Digital multimeter |
Question 60 |
Torque on a current carrying coil is given by
A | τ = NIABsinα |
B | τ = NIABcosα |
C | τ = NWABsinα |
D | τ = NWABcosα |
Question 61 |
If a high resistance is connected in series with the galvanometer the resulting instrument is called
A | A voltmeter |
B | A potentiometer |
C | An AVO meter |
D | An ammeter |
Question 62 |
Brightness of screen of CRO controlled by
A | Anode |
B | Filament |
C | Grid |
D | Cathode |
Question 63 |
Useful device to measure resistance current and voltage is an electronic instrument called
A | Ammeter |
B | Digital Multimeter |
C | Voltmeter |
D | Ohmmeter |
Question 64 |
To convert a-galvanometer into an ammeter, of range I ampere the shunt resistance is given by
A | Rs = (IgRg)/(I-Ig) |
B | Rs = (IgRg)/(I+Ig) |
C | Rs = (I- Ig)/(IgRg) |
D | Rs = (I- Ig)/(IgRg) |
Question 65 |
The sensitivity of galvanometer is given by
A | CAN/B |
B | C/BAN |
C | BAN/C |
D | BN/CA |
Question 66 |
A magnetic needle is kept in a non-uniform magnetic field it experience
A | A force and a torque |
B | Torque but not force |
C | Neither a force nor a torque |
D | Force but not torque |
Question 67 |
The brightness of spot in CRO is controlled by
A | Cathode |
B | Anode |
C | Grid |
D | Deflecting Plates |
Question 68 |
The ray which remain undeflected in a magnetic field is
A | Cathode rays |
B | βRays |
C | γRays |
D | αrays |
Question 69 |
Two parallel straight wires carrying current in same direction will
A | May repel or attract |
B | Attract each other |
C | Repel each other |
D | No effect |
Question 70 |
The galvanometer can be made sensitive by making the factor BAN/C
A | Zero |
B | Large |
C | Constnt |
D | Small |
Question 71 |
The sensitivity of a galvanometer can be, increased by
A | Increasing the magnetic field |
B | Using a fine suspension |
C | Decreasing the area of the coil |
D | Decreasing the number of turns of coil |
Question 72 |
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 | 8 x10-11N |
B | 8 x 10-12N |
C | 2.5 x 10-10N |
D | 2.5 x 10-11N |
Question 73 |
An electron enters the magnetic field at right angle from left B is into paper. The electron will be deflected
A | Towards left |
B | Towards right |
C | Downwards |
D | Upward |
Question 74 |
A voltmeter is always connected in circuit in
A | Parallel |
B | Series |
C | None of these |
D | Both a and b |
Question 75 |
One Tesla is equal to
A | N Am |
B | N-1Am-1 |
C | NA-1m |
D | NAm-1 |
Question 76 |
A charged particle enters in a strong magnetic field its k.E.
A | Remain constant |
B | Increases |
C | Decreases |
D | Increases then Decreses |
Question 77 |
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 | 6 x 10-3T |
B | 6 x 10-4T |
C | 3 x 10-3T |
D | 3 x 10-4T |
Question 78 |
The unit of Magnetic Flux
A | Nm-1A-1 |
B | NmA |
C | NmA-1 |
D | Nm-1A |
Question 79 |
The sensitivity of galvanometer is given by
A | BAN/C |
B | CAN/B |
C | C/BAN |
D | B/CAN |
Question 80 |
If a charge is at rest in a magnetic field then force on charge is
A | q VB cosΘ |
B | Zero |
C | q(V? x B? |
D | q VB sinΘ |
Question 81 |
The high resistance Rh to convert a galvanometer into a voltmeter is Rh=
A | (Rgg) |
B | (V/Ig)-(Rg) |
C | (Ig)/(I-Ig) |
D | (V/Ig)+(Rg) |
Question 82 |
Emf is induced due to change in
A | Electric field |
B | Magnetic flux |
C | Current |
D | Charge |
Question 83 |
In a current carrying long solenoid the magnetic filed produced does not depend upon
A | The radius of solenoid |
B | All of the above three |
C | Number of turns per unit length |
D | Current flowing through solenoid |
Question 84 |
Two parallel wires carrying current in the same direction:
A | Attract each other |
B | Repel each other |
C | Cancel their fields |
D | No effect on each other |
Question 85 |
The sum of electric and magnetic force is called
A | Newton's force |
B | Centripetal force |
C | Lorentz force |
D | Maxwell force |
Question 86 |
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 | North |
C | South |
D | East |
Question 87 |
Torque is produced in a current carrying coil when it is placed in a
A | Magnetic field |
B | Electric field |
C | Nuclear field |
D | Gravitational field |
Question 88 |
The brightness of the spot on CRO screen is controlled by
A | Grid |
B | Cathode |
C | Deflecting Plates |
D | Anode |
Question 89 |
When an electron is entered in a magnetic field, The magnitude of velocity of electron
A | Increases |
B | Is independent of field strength |
C | Decrease |
D | Depend on field strength |
Question 90 |
A strong magnetic field is applied to a stationary electron then
A | Electron move opposite to the field |
B | Electron start spinning |
C | Electron remain stationary |
D | Electron move in the direction of field |
Question 91 |
A device which can measure current, potential difference and resistance is called
A | Ohmmeter |
B | Ammeter |
C | Volt meter |
D | AVO meter |
Question 92 |
Galvanometer can be converted into voltmeter by connecting a high resistance in:
A | Series with galvanometer |
B | Parallel as well as series with the galvanometer |
C | Parallel with galvanometer |
D | None of these |
Question 93 |
The value of permeability of free space µ0 is given by
A | 4 x 10-9 Wb A-1m-1 |
B | 4 x 10-7 Wb A-1m-1 |
C | 4 x 107 Wb A-1m-1 |
D | 4 x 10-7 Wb Am |
Question 94 |
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 | √2R |
C | 2R |
D | R/√2 |
Question 95 |
If a long hollow copper pipe carries a direct current The magnetic field due to current will be
A | Both inside and outside the pipe |
B | Only inside the pipe |
C | Neither inside nor outside the pipe |
D | Only outside the pipe |
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