MDCAT XII Physics Electromagnetic Induction Online Test-2

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Test Details:

Subject: Physics
Class: 2nd year / XII
Chapter Name: Electromagnetic Induction
Test: MDCAT 2025
Book: Sindh Textbook
Total No. Of MCQS: 50 MCQS
Time Allowed: 50 Minutes
Price: Free

112

Created on April 28, 2025 By

medicoengineer.com

MDCAT XII Physics Electromagnetic Induction Online Test-2

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NameEmailPhone Number

1 / 50

1. In a coil, the current is changing at a rate of 0.5A/s, the coil has self-induction of 2H, then the emf induced in the coil is

a) 1

b) -1

c) 10

d) -10

2 / 50

2. Induced electromotive force can be induced by

a) Changing magnetic flux

b) Changing magnetic strength

c) Both A and B

d) Cant be determined

3 / 50

3. The turn ratio of coils of the transformer is 2, then the voltage in step up from 10 to

a) 20

b) 30

c) 50

d) 100

4 / 50

4. In electric motor,electric energy in converted into

a) Magnetic energy

b) Chemical energy

c) Mechanical enegy

d) All of these

5 / 50

5. The diagram shows the movement of the magnet, the induced current produced in coils A and B, respectively is

a) clockwise,clockwise

b) Clockwise,anticlockwise

c) Anticlockwis,anticlockwise

d) Anticlockwise,clockwise

6 / 50

6. In the above diagram,A and B sides generate which poles ,respectively

a) North,north

b) North,south

c) South,south

d) South,north

7 / 50

7. If Ns:Np is 20:40,Then find correct Is:Ip ratio

a) 40:80

b) 240:120

c) 30:90

d) BOTH A AND B

8 / 50

8. The current in a coil changes due to change in magnetic of owm coil ,it produces back emf,this phenomenon is known as

a) Self inductance

b) Mutual inductance

c) Self induction

d) Mutual induction

9 / 50

9. What is rate of change of current in a coil,whose inductance is 2H ,and emf induced in 50v

a) 5

b) 25

c) 50

d) None

10 / 50

10. Concept of electromagnetic induction was given by

a) newton

b) Micheal Farady

c) Hans oersted

d) Einestein

11 / 50

11. A circular coil is moving perpendicular to both x and y axis in a magnetic field as shown in figure,what is direction of induced current in coil

a) Clockwise

b) Anticlockwise

c) Either clockwise or anticlockwise

d) None of these

12 / 50

12. An AC generator converts--------into-------energy

a) Mechanical energy,electrical energy

b) Electrical energy,mechanical energy

c) Magnetic energy,electrical energy

d) Electrical energy,magnetic energy

13 / 50

13. EMF is produced at maximum when a conductor moves in a magnetic field at

a) 0°

b) 45°

c) 60°

d) 90°

14 / 50

14. Magnitude of emf can be influenced by

a) Change in magnetic flux

b) Material

c) Temperature

d) All of these

15 / 50

15. Which of the following is the property of an ideal transformer?

a) eddy current loss

b) hysteresis loss

c) resistance loss

d) none of these

16 / 50

16. a coil of 100 turns rotates in a magnetic field of 2web/m2 with 0.1 rad/sec ,the coil has area of 5m2 ,the maximu induced emf in coil is

a) 10

b) 20

c) 100

d) 200

17 / 50

17. Eddy currents are produced in accordance with

a) Oersted law of electromagnetism

b) Farady’s law of electromagnetic induction

c) Columbs law of electrostatics

d) All of these

18 / 50

18. The motional emf produced in a conductor depends on all except

a) material of the conductor

b) magnetic field

c) length

d) all of these

19 / 50

19. The direction of induced emf is always such that it

a) Opposes itself

b) Opposes the cause which produce it

c) Both A and B

d) Cant be determined

20 / 50

20. Peak value of emf depends on

a) Area of Coil

b) Number of coil

c) Intensity of magnetic field

d) All of these

21 / 50

21. Secondary to primary ratio of turns of coil is 30,if current in secondary coil is 10,how much current in primary coil

a) 0.33

b) 3

c) 10

d) 300

22 / 50

22. Direction of emf is reversed after

a) ¼ of the cycle

b) ½ of the cycle

c) 1 cycle

d) 2 cycles

23 / 50

23. In lenz law ---------is converted into-------

a) magnetic energy, Workdone in changing electrical field

b) electrical energy, Workdone in changing magnetic

c) Workdone in changing magnetic field,electrical energy

d) Workdone in changing electrical field,magnetic energy

24 / 50

24. If current is primary coil is 2A and voltage of secondary coil is 20v,what is voltage is primary coil,if current in secondary coil is 4A

a) 40

b) 10

c) 0.1

d) 20

25 / 50

25. faraday’s law of electromagnetic induction states that

a) chaging electric field produce magnetic field

b) changing magnetic field produce electric field

c) both of these

d) none of these

26 / 50

26. A coil is placed in a magnetic field which is changing at a rate of 2T/s, the coil has a surface area of 2cm,a nd 1000 turns, how much emf is induced?

a) 0.1

b) 0.2

c) 0.4

d) 0.8

27 / 50

27. When the speed of the motor increases, the current is?

a) Increase

b) Decreased

c) May increase or decrease

d) Cant be determined

28 / 50

28. Due to phenomenon of --------,wires are also known as inductior

a) Self induction

b) Mutual induction

c) Both a and b

d) None of these

29 / 50

29. At power stations, to reduce energy loss, what is preferred?

a) Higher currents

b) Both a abd b

c) Higher voltage

d) Cant be determined

30 / 50

30. When an induced emf between two coils is 5 volts, and the current is changing at a rate of 0.5A/s, what is the magnitude of mutual induction between coils?

a) 2.5

b) 5

c) 10

d) 0

31 / 50

31. Induced emf produced through a coil is independent of:

a) Magnetic field strength

b) Speed of magnet

c) Number of coil’s turns

d) Resistance of coil

32 / 50

32. At power substations:

a) Step-up transformer is used

b) Step-down transformer is used

c) Either of these transformers can be used

d) None of these

33 / 50

33. Voltage in a transformer is reduced from 50,000 V to 10,000 V. If the primary coil has 200 turns, how many turns are present in the secondary coil?

a) 5

b) 40

c) 10

d) 50

34 / 50

34. Flux linkage in a coil is affected by:

a) Changing number of turns

b) Changing magnetic flux

c) Changing relative positions of magnet and coil

d) All of these

35 / 50

35. The electrical inertia of a coil is measured by:

a) Self-induction

b) Mutual induction

c) Both A and B

d) None of these

36 / 50

36. Two coils 1 and 2 are placed as shown in the figure.
When current flows through part of coil 1 from B to A, what is the direction of the induced current in coil 2 due to the current in coil 1?

a) Into the plane of the paper

b) Out of the plane of the paper

c) Clockwise

d) Anticlockwise

37 / 50

37. When the south pole of a bar magnet is rapidly moved away from a solenoid, what happens in the solenoid?

a) In the solenoid, clockwise current is induced

b) In the solenoid, anticlockwise current is induced

c) In the solenoid, no current is induced

d) Can't be determined

38 / 50

38. In a transformer, which of the following remains the same?

a) Ratio of P and I

b) Product of P and I

c) Difference of P and I

d) None of these

39 / 50

39. Induced emf is minimum when:

a) Magnetic field and plane of coil are parallel to each other

b) Magnetic field and plane of coil are at a 45° angle to each other

c) Magnetic field and plane of coil are perpendicular to each other

d) Magnetic field and plane of coil are at a 60° angle to each other

40 / 50

40. When the external field is decreasing in a coil, in which direction is the induced current produced to create a magnetic field?

a) In the same direction as the magnetic field

b) In the opposite direction to the magnetic field

c) Induced current will not produce a magnetic field

d) Can't be determined

41 / 50

41. The thinner wire in a transformer has:

a) Low current

b) Low voltage

c) Large current

d) Both A and B

42 / 50

42. In the ------ coil of ------ transformers, turns are smaller and current is ------:

a) Secondary, step-up, smaller

b) Secondary, step-down, larger

c) Primary, step-up, smaller

d) Primary, step-down, larger

43 / 50

43. What will happen to the inductance of a coil when the iron core is replaced by air?

a) It will increase

b) It will decrease

c) It will remain the same

d) Can't be determined

44 / 50

44. For an ideal transformer, which condition is necessary?

a) Current in the primary coil equals the current in the secondary coil

b) Voltage in the primary coil equals the voltage in the secondary coil

c) Power in the primary coil equals the power in the secondary coil

d) All of these

45 / 50

45. Magnetic levitation trains use ------ of magnets to stay in the air:

a) Attracting

b) Repelling

c) Both A and B

d) None of these

46 / 50

46. A steady current is flowing through a solenoid connected to a battery. Suddenly, an iron core is inserted inside the solenoid. What will happen?

a) Current in the solenoid increases

b) Current in the solenoid decreases

c) Current in the solenoid remains the same

d) Can't be determined

47 / 50

47. Mutual induction between two coils is changed when:

a) core of coil is changed

b) number of turns of coils changed

c) primary and secondary coils are interchanged

d) Both A and B

48 / 50

48. The voltage induced in the secondary coil of a transformer is due to:

a) Iron core of the transformer

b) A changing magnetic field

c) Vibrations of primary coils

d) All of these

49 / 50

49. What is the importance of Lenz’s law?

a) It gives the direction of induced current

b) It is in accordance with the law of conservation of energy

c) Both A and B

d) None of these

50 / 50

50. To reduce eddy currents:

a) Iron core is used

b) Large number of coils are used

c) Laminated cores are used

d) All of these

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MDCAT XII Physics Electromagnetic Induction Online Test-2

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