Home/ECAT/ECAT Physics Electromagnetism Online Test

ECAT Physics Electromagnetism Online Test

Maan AliLast Updated: April 18, 2025

Physics Electromagnetism MCQS Online Test

ECAT Physics Electromagnetism Chapter Online Test

Total Questions:	56
Time Allowed:	25 Minutes
Total Marks:	56
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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1. Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called

Magnetic flux

Magnetic field intensity

Magnetic induction

Self inductance

2. A magnetic field

Always exerts a force on a charged particle

Exerts a force if the charged particle is moving in the direction of the magnetic field lines

Exerts a force if the charged particle is moving perpendicular to the magnetic field lines

Never exerts a force on a charged particles

3. Which one of the following material is most suitable for making core of an electromagnet?

Air

Steel

Cu-Ni alloy

Soft iron

4. Magnetic flux and flux density are related by

Magnetic flux = flux density/area

Magnetic flux = flux density x area

Flux density = magnetic flux area

Flux density = magnetic flux x area

5. Galvanometer is a very sensitive device with

Very low damping

Very high damping

No damping at all

Radial field disintegration

6. Which one of the following methods would be able to increase the sensitivity of a moving coil galvanometer?

Connect a shunt across the coil

Use a coil of smaller cross sectional area

Use a coil having less number of turns

Use spiral springs whose force constant is small

7. An instrument which can measure potential without drawing any current is

Voltmeter

Galvanometer

Cathode ray oscilloscope (CRO)

Ammeter

8. When the coil of the galvanometer is in equilibrium then the deflection couple is

Zero

Equal to the restoring couple

Greater than the restoring couple

Smaller than the restoring couple

9. Which one of the following is not an electro mechanical instrument?

Galvanometer

Voltmeter

Ammeter

AC transformer and DC generator

10. In a multi range ammeter as the range increases

Shunt value decreases

Shunt value increases

Shunt value remains the same

None of these

11. An ammeter measures the total current flowing through a circuit when it is connected

In series with the circuit

In parallel with circuit

In series with any of the parallel resistances in the circuit

In parallel with any of the series resistances in the circuit

12. The path along which an isolated north pole of a magnet moves in the magnetic field is called

Magnetic field

Magnetic Field Lines

Loop

Electric Lines of Force

13. The S.I. units of magnetic field is

Wb m¯¹

Wb m¯²

None of these

14. The SI unit of magnetic induction is

Tesla

Weber

Gauss

Ampere

15. One tesla is equal to

1 Nm A¯¹

1 NA¯¹ m¯¹

1 Nm¯¹ A

None of these

16. Ampere’s law in analogous to

Faraday’s law

Guass’s law

Lenz’s law

None of these

17. When the magnetic flux changes through a loop on a coil, an induced emf is produced in it. This is called

Ampere’s law

Faraday’s law

Lenz’s law

Guass’s law

18. When a proton enters into a magnetic field perpendicularly, the proton will experience a force along the

Upward direction

Downward direction

Undeflected

None of these

19. A device which produces a voltage difference between two terminals by changing flux through the coil is called

Resistance box

Electric motor

Electric generator

Transformer

20. Electric force is the force which is experienced by a positive charge to produce

Displacement

Work

Attraction

None of these

21. Choose the correct statement

Both an ammeter and voltmeter should have small resistance

Both an ammeter and voltmeter should have large resistance

An ammeter should have large resistance and a voltmeter should have small resistance

An ammeter should have small resistance and a voltmeter should have large resistance.

22. The torque ‘τ’ produced by the coil of the galvanometer is

NBA cos α

NIBA sin α

NIAB cos α

None of these

23. An electron is projected along the axis of a circular conductor carrying some current. Electron will experience force

Along the axis

Perpendicular to the axis

At an angle of 4° with axis

No force experienced

24. The current passing through the coil of moving coil galvanometer is directly proportional to

Number of turns

Angle of deflection

Magnetic field

None of these

25. In order to convert galvanometer into voltmeter, a resistor is connected in series with the galvanometer

A low resistor

Capacitor

Semi conductor

A very high resistor

Page 2 of 3

26. In case of a suspended coil galvanometer the Restoring torque =

BAN

cθ

None of these

27. The resistance of voltmeter must have very high resistance because

It does not draw any current

It is very accurate

It does not change considerably

None of these

28. According to Ampere Circuital law, the sum of the quantities B,∆L for all path elements into which the complete loop has been divided =

μ₀I

ε₀I

Zero

None of these

29. Velocity (V), Magnetic force (F), and magnetic field (B) are

Mutually perpendicular

Parallel

V and B are perpendicular

F and B are perpendicular

30. Magnetic flux passing normally, through a unit area is called

Magnetization

Magnetic field Intensity

Magnetic flux density

All of these

31. When a charged particle is projected perpendicularly in a magnetic field, its trajectory is

Cycloid

Parabola

Circular

Helix

32. When a charged particle q is moving with velocity v in region where there is an electric field E and magnetic field B, the total force F is given as

F = qE + q(V x B)

F = E + B

F = Eq

F = qE + qB

33. Working of a galvanometer depends on

Force exerted on a coil

Torque on a coil

Induced emf

None of these

34. The direction of Lorentz force depends on the sign of change in a magnetic field

Negative

Positive

No change

Both positive and negative

35. DMM is

Like CRO

Digital version of AVO meter

Digital version of Ohm meter

Digital version of Ammeter

36. A digital multi meter is preferred over ordinary AVO meter because

No needle is used

Error free reading

No battery is used

None of these

37. The S.I unit of magnetic induction is

Weber

Weber²

Tesla

Gauss

38. If a diamagnetic substance is brought near north or south pole of a bar magnet it is

Attracted by the poles

Repelled by the poles

Repelled by north pole and attracted by the south pole

Attracted by the north pole and repelled by the south pole

39. A moving charge will gain energy due to the application of

Electric field

Magnetic field

Both of these

None of these

40. The incorrect statement regarding the lines of force of the magnetic field B is

Magnetic intensity is a measure of lines of force passing through unit area held normal to it

Magnetic lines of force form a close curve

Inside a magnet, its magnetic lines of force move from north pole of a magnet towards its south pole.

Due to a magnet magnetic lines of force never cut each other.

41. If in a moving coil galvanometer a current I produces a defection θ, then

i ∞ tan θ

i ∞ θ²

i ∞ θ

i ∞ √θ

42. The sensitivity of galvanometer depends on

Earth’s magnetic field

Angle of deflection

Moment of inertia of coil

None of these

43. A charge of 1 C is moving in a magnetic field of 0.5 tesla with velocity of 10 m/s. Force experienced is

5 N

10 N

0.5 N

0 N

44. A current carrying coil when freely suspended will align itself

Parallel to the magnetic meridian

Perpendicular to the magnetic meridian

At an angle of 45° to the magnetic meridian

Any of the above positions

45. Identify the paramagnetic substance

Iron

Aluminum

Nickel

Hydrogen

46. If a ammeter is to be used in place of a voltmeter, then we must connect with the ammeter

Low resistance in parallel

High resistance in parallel

High resistance in series

Low resistance in series

47. If an electron and a proton having same momenta enter perpendicular to a magnetic field, then

Curved path of electron and proton will be same (ignoring the sense of revolution)

They will move un-deflected

Curved path of electron is more curved than that of the proton

Path or proton is more curved

48. The Weber ampere per meter is equal to

Joule

Henry

Newton

Watt

49. When a charged particle enters in a uniform magnetic field, its kinetic energy

Remains constant

Increases

Decreases

Becomes zero

50. If the current is doubled, the deflection is also doubled in

A tangent galvanometer

A moving coil galvanometer

Both A and B

None of these

Page 3 of 3

51. Which of the following statements is incorrect about hysteresis?

This effect is common to all ferromagnetic substances

The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material

The hysteresis loop area is independent of the thermal energy developed par unit volume of the material

The shape of the hysteresis loop is characteristic of the material

52. An electron is projected along the axis of a circular conductor carrying some current. Electron will experience force

Along the axis

Perpendicular to the axis

At an angle of 4° with axis

No force experienced

53. To convert a moving coil galvanometer into voltmeter the value and type of connection of the resistance to be connected with should be

Low ad parallel

High and parallel

Low and series

High and series

54. The magnetic moment of a current (I) carrying circular coil of radius (r) and number of turns (n) varies as

1/r²

1/r

r²

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Maan AliLast Updated: April 18, 2025

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ECAT Physics Electromagnetism Online Test

Physics Electromagnetism MCQS Online Test

ECAT Physics Electromagnetism Chapter Online Test

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Physics Electromagnetism MCQS Online Test

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