1. The magnetic effect of a current was discovered accidentally by the Danish scientist
Answer: C. Hans Christian Oersted
Physics Class 10 Unit 19: Electromagnetism MCQs
60 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers". This is page 1 of 2.
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2. A current-carrying straight wire produces a magnetic field in the form of
Answer: D. concentric circles
3. The direction of the magnetic field around a straight current-carrying wire is found using the
Answer: B. right-hand rule
4. In the right-hand rule for a wire, the thumb points in the direction of the
Answer: A. current
5. In the right-hand rule for a wire, the curled fingers show the direction of the
Answer: C. magnetic field
6. Magnetic field lines form
Answer: B. closed paths
7. Two long parallel wires carrying currents in the same direction
Answer: D. attract each other
8. Two long parallel wires carrying currents in opposite directions
Answer: A. repel each other
9. The magnetic field of a current-carrying solenoid is
Answer: A. strong and uniform along its axis and very weak outside
10. The magnetic field of a solenoid resembles that of a
Answer: C. bar magnet
11. In the right-hand rule for a solenoid, the curled fingers show the direction of the
Answer: D. conventional current
12. In the right-hand rule for a solenoid, the thumb points to the
Answer: B. north pole of the coil
13. The Earth's magnetic south pole is near the
Answer: A. geographic North Pole
14. The north pole of a compass needle is attracted to the
Answer: C. magnetic south pole of Earth near the geographic North Pole
15. The magnitude of Earth's magnetic field at its surface ranges from about
Answer: B. 25 to 65 µT
16. Earth's magnetic field is generated by
Answer: D. rotation of the Earth and its molten iron core containing moving charged particles
17. In a loudspeaker, electrical energy is converted into
Answer: C. mechanical energy that produces sound
18. In a loudspeaker, the volume of the sound is determined by the
Answer: A. amplitude of the electrical signal
19. A relay uses the ______ of a current to control the output circuit.
Answer: D. magnetic effect
20. A current-carrying conductor in a magnetic field experiences a
Answer: B. force
21. The force on a current-carrying conductor in a magnetic field increases if the current
Answer: D. is increased
22. The direction of the force on a current-carrying conductor can be reversed by reversing
Answer: A. the direction of the current or the magnetic field
23. The force on a current-carrying wire in a magnetic field is always
Answer: B. perpendicular to both the magnetic field and the current
24. The direction of force on a current-carrying conductor is given by
Answer: C. Fleming's left-hand rule
25. In Fleming's left-hand rule, the forefinger points in the direction of the
Answer: A. magnetic field
26. In Fleming's left-hand rule, the middle finger points in the direction of the
Answer: C. current
27. In Fleming's left-hand rule, the thumb points in the direction of the
Answer: D. force
28. The turning effect on a current-carrying coil is increased by increasing the number of turns, the current and the
Answer: B. strength of the magnetic field
29. An electric motor converts
Answer: A. electrical energy into mechanical energy
30. The working principle of an electric motor is that a current-carrying coil in a magnetic field
Answer: B. experiences a torque
31. In a motor, the split ring commutator
Answer: C. reverses the direction of current in the coil every half turn
32. Electromagnetic induction is the production of an emf across a conductor exposed to a
Answer: D. varying magnetic field
33. An emf is induced in a coil when there is
Answer: C. relative motion between the coil and the magnet
34. Lenz's law states that the direction of induced current is such that it
Answer: B. opposes the cause which produces it
35. Lenz's law is explained when the north pole of a magnet moves towards a coil: the nearer end of the coil becomes a
Answer: D. north pole
36. Which of the following devices works on the principle of electromagnetic induction?
Answer: A. Transformer
37. An AC generator converts
Answer: D. mechanical energy into electrical energy
38. The output emf of a simple AC generator
Answer: A. alternates in direction and strength as the coil rotates
39. In a simple AC generator, the emf is maximum when the coil is
Answer: C. horizontal
40. The domestic electricity supply has a frequency of
Answer: B. 50 Hz
41. A transformer is an electrical device used to
Answer: A. increase or decrease an alternating voltage
42. A transformer is ineffective with DC because DC does not produce a
Answer: C. changing magnetic field
43. The basic transformer equation is
Answer: B. Vs/Vp = Ns/Np
44. A step-up transformer has
Answer: D. more turns in the secondary than in the primary
45. A step-down transformer has
Answer: C. fewer turns in the secondary than in the primary
46. A step-down transformer converts 240 V into 12 V. With 2000 turns in the primary, the secondary has
Answer: A. 100 turns
47. A step-up transformer has a turns ratio of 1:100 and 20 V on the primary. The secondary voltage is
Answer: D. 2000 V
48. A step-up transformer has a transformation ratio of 3:2. If the primary voltage is 30 V, the secondary voltage is
Answer: B. 45 V
49. A transformer steps up 115 V to 230 V for a hair dryer drawing 5 A. The current drawn from the mains is
Answer: D. 10 A
50. Which quantity remains constant in an ideal step-up transformer?
Answer: B. Power
About Physics Class 10 Unit 19 MCQs (Federal Board)
These 60 Physics MCQs cover Class 10 Unit 19: Electromagnetism of the Federal Board (FBISE) SSC-II (Class 10) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 2 pages of 50. You can also read the Electromagnetism notes for this chapter. Download the Electromagnetism MCQs as a PDF using the button at the top of this page.