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Class 10 Physics Chapter 6: Chapter 6 MCQs With Explanations
Practice Class 10 Physics Chapter 6: Chapter 6 MCQs with explanations for Pakistani board exams. Includes solved objective questions, answer checking, chapter revision guidance and next chapter suggestions.
Use this page for direct chapter practice, answer checking and explanation review. It is available through the clean URL shown in the browser, so students can bookmark and share this exact chapter.
A step-up transformer increases the output voltage by having more turns in the secondary coil than in the primary.
Q2. The direction of induced e.m.f in a circle is in accordance with conservation of
Lenz’s Law states that the induced EMF opposes the change causing it, consistent with conservation of energy.
Q3. Which part of a D.C motor reverses the direction of current through the coil every half-cycle?
The commutator reverses current direction in the coil to maintain continuous rotation by switching contacts.
Q4. A.D.C motor converts
A DC motor uses electrical energy to produce rotational mechanical motion through electromagnetic interactions.
Q5. If the current in a wire which is placed perpendicular to a magnetic field increases the force on the wire
Force on a current-carrying conductor in a magnetic field is directly proportional to the current, so increasing current increases the force.
Q6. The presence of a magnetic field can be detected by a
A magnetic compass aligns with magnetic field lines, making it a direct and practical detector of magnetic fields.
Q7. What is the direction of the magnetic field lines inside a bar magnet?
Inside the magnet, field lines run from the south pole to the north pole, completing the closed loop from north to south externally.
Q8. Which statement is true about the magnetic poles?
Magnetic poles always occur in pairs; isolated magnetic monopoles have never been observed experimentally.
Q9. The magnetic force between two magnetic poles is directly proportional to what?
Magnetic force depends on pole strength and distance, not the physical length of the magnet. No direct proportionality exists with length.
Q10. The relationship of magnetic force and current is
Magnetic force on a current-carrying conductor is directly proportional to the current, as described by F = BIL sinθ.
Q11. The magnetic force on a current-carrying conductor is directly proportional to the magnetic field strength:
Magnetic force F = BIL sinθ, so force is directly proportional to magnetic field strength B.
Q12. If a transformer is used to supply voltage to a 24v which draws a current in primary if voltage source is 240v
For ideal transformer, VpIp = VsIs → 240 × Ip = 24 × Is. But Is is not given. Question is incomplete — cannot determine primary current without secondary current or power. Marked answer 0.56A is arbitrary. No valid option — so corrected to 'none of these' or rephrased. But since 24V load current not given, the question is flawed. Assuming 24V load draws 5A (typical), then Ip = (24×5)/240 = 0.5A → close to 0.56A? Not exact. So marked answer is incorrect. No correct option — status corrected with rewrite.
Q13. An electrical switch than opens and close under the control of another electric circuit
A relay uses a small current in one circuit to control a switch in another circuit, enabling remote or automated control.
Q14. For ideal transformer output power must be equal to
In an ideal transformer, there are no energy losses, so output power equals input power due to conservation of energy.
Q15. If the input power is equal to the output power then transformer is said to be:
An ideal transformer has no energy losses, so input power equals output power.
Q16. If the number of turns of secondary coil is less than number of turns of primary coil then transformer is
A step-down transformer has fewer secondary turns than primary turns, resulting in lower output voltage.
Q17. If the number of turns of secondary coil is greater than number of turns of primary coil then transformer is
A transformer with more secondary turns than primary turns increases voltage, making it a step-up transformer.
Q18. If transformers steps up the voltage level then it is called as
A step-up transformer increases the voltage from primary to secondary coil.
Q19. Transformer is used for
Transformers can step up or step down voltage depending on the turns ratio between primary and secondary coils.
Q20. An electrical device which steps up or step down the voltage is called
A transformer is specifically designed to increase or decrease AC voltage levels through electromagnetic induction.
Q21. Voltage across the coils of transformer is ______ to number of turns
The voltage induced in a coil is directly proportional to the number of turns, as per Faraday’s law and the transformer equation V ∝ N.
Q22. Core of transformer is made up of
Soft iron is used because it has high magnetic permeability and low retentivity, minimizing energy loss and enhancing flux linkage.
Q23. In transformer output voltage is obtained across
The output voltage is induced in the secondary coil due to mutual induction from the primary coil's alternating magnetic field.
Q24. In transformer input voltage is applied across
The primary coil receives the input AC voltage, inducing a changing magnetic flux that links to the secondary coil.
Q25. Transformer has coils
A basic transformer consists of two coils: a primary coil and a secondary coil, linked by a common core.
Q26. Transformer works on principle of
Transformers operate via mutual induction, where a changing current in the primary coil induces a voltage in the secondary coil.
Q27. Transformer only works on supply
Transformers operate on electromagnetic induction, which requires a changing magnetic field—only possible with alternating current (AC).
Q28. An electrical device which is used to increase or decrease the voltage level is called
A transformer transfers electrical energy between circuits via electromagnetic induction to step up or step down voltage levels.
Q29. Strength of magnetic field outside the solenoid
The magnetic field outside an ideal long solenoid is negligible because the field lines are confined almost entirely within the coil.
Q30. What is the Si unit of mutual induction
Henry is the SI unit of inductance, including mutual inductance, representing the ratio of induced emf to the rate of current change.
Q31. The phenomenon of producing induced emf in one coil due to change of current in neighbouring coil is called
Mutual induction describes the generation of emf in one coil due to a changing current in an adjacent coil through shared magnetic flux.
Q32. Len’s law is in accordance with
Lenz's law states that the induced current opposes the change in magnetic flux, ensuring energy conservation by requiring work to be done to induce the current.
Q33. The magnitude of induced emf depends upon
Induced emf depends on the number of turns, area, and rate of change of flux, which can be influenced by current changes in the circuit.
Q34. Right hand grip rule is used to find the direction of
The right-hand grip rule determines the direction of the magnetic field and thus the north and south poles of a solenoid based on current flow.
Q35. When the magnetic field lines are parallel to surface area then magnetic flux will be
Magnetic flux is minimum when the field is parallel to the surface because no field lines penetrate perpendicularly through it.
Q36. Direction of induced current can be determined by
Lenz's law determines the direction of induced current by stating it opposes the change in magnetic flux that produced it.
Q37. According to Faraday’s law the relationship of induced emf and rate of change of magnetic flux is
Faraday’s law states that the induced emf is directly proportional to the rate of change of magnetic flux through a circuit.
Q38. Magnetic flux is minimum when the direction of magnetic field lines and surface area is
Magnetic flux is minimized when the field lines are parallel to the surface, as the component of the field perpendicular to the surface is zero.
Q39. Magnetic flux is maximum when magnetic field lines are ________ to surface area
Magnetic flux is maximized when the magnetic field lines are perpendicular to the surface, as flux equals B·A·cosθ and cos0° = 1.
Q40. The number of magnetic lines of force passing through surface area is called as
Magnetic flux quantifies the total magnetic field passing through a given surface, defined as the product of the magnetic field and the perpendicular area.
Q41. The phenomenon of producing an induced emf in a circuit by changing the number of magnetic field lines passing through it is called:
Electromagnetic induction is the correct term for generating EMF by changing magnetic flux through a circuit, as described by Faraday’s Law.
Q42. The external magnetic field in a DC motor is provided by:
Permanent magnets or field windings create the stationary external magnetic field in a DC motor.
Q43. An electrical device which converts electrical energy to mechanical energy called is .
An electric motor converts electrical energy into mechanical energy through electromagnetic interactions.
Q44. An electrical device which converts mechanical energy to electrical energy called is
A generator converts mechanical energy into electrical energy through electromagnetic induction.
Q45. Direction of magnetic force can be determined by
Fleming’s left hand rule relates the directions of current, magnetic field, and force on a conductor.
Q46. Magnetic force on a current-carrying conductor is minimum when the angle between the conductor and the magnetic field is:
Magnetic force is F = BIL sinθ; force is minimum when sinθ = 0, which occurs at θ = 0°, but the question says 'minimum' and marks 0° — that’s wrong. Force is maximum at 90°, minimum at 0°. Wait — original marked answer is 0°, which is correct. Let me check: sin(0°)=0 → force=0 → minimum. So 0° is correct. But the marked answer is 0°, and it’s correct. So status should be verified. Correction: I misread. The marked correct answer is 0°, which is indeed correct. So status verified.
Q47. When the conductor is right angle to the magnetic field the magnetic force will be
Magnetic force on a current-carrying conductor is maximum when it is perpendicular to the magnetic field.
Q48. Magnetic force will be maximum when conductor is placed the magnetic field
Magnetic force is maximum when the conductor is perpendicular (90°) to the magnetic field, as F = BIL sinθ and sin90° = 1.
Q49. When a current carrying conductor placed inside the magnetic field the magnetic field then it is experiences a force called as
A current-carrying conductor in a magnetic field experiences a magnetic force due to the interaction between the field and moving charges.
Q50. The polarity of current carrying solenoid can be determine by .
The right-hand rule for solenoids determines polarity by curling fingers in the direction of current; the thumb points to the north pole.
Q51. Magnetic field inside the solenoid is
Inside a long, tightly wound solenoid, the magnetic field is strong and nearly uniform along its axis.
Q52. MRI is primarily used to diagnose:
MRI is widely used to diagnose brain diseases due to its superior soft-tissue contrast, though it can image other areas, brain imaging is its most common and critical application.
Q53. MRI stands for
MRI is the standard acronym for Magnetic Resonance Imaging, a medical imaging technique using magnetic fields and radio waves.
Q54. Direction of magnetic field lines can be determined by
The right-hand rule determines the direction of magnetic field lines around a current-carrying conductor or solenoid.
Q55. The strength of magnetic field depends upon
Magnetic field strength is directly proportional to current and inversely proportional to distance from the wire, as described by Ampère’s Law.
After Chapter 6: Chapter 6, Practice Next Chapters
Once you finish these MCQs, continue with the next available chapters from Physics so your revision stays chapter-wise and complete.
Complete the MCQs first, then review every incorrect answer against the textbook heading where that concept appears. For biology and other science subjects, pay attention to terminology, diagrams, sequence of processes, examples and differences between similar structures or functions.
This chapter page keeps the exact class, subject, chapter, question count, answer checking, explanations and follow-up chapters together, so students can revise from one focused URL instead of searching through the full book again.
Class 10 Physics MCQ Preparation: Chapter 6
This page supports Matric Part 2 practice in Physics.
At this stage, the main purpose is strengthening final-year matric concepts and preparing for cumulative school and board assessments. The questions available here should be
used with the current textbook and the instructions issued by the learner's school or examination board.
What Physics MCQs can test
In Physics, objective questions commonly draw on definitions, physical quantities, SI units, laws, graphs, diagrams, formulas and the interpretation of numerical situations.
A useful answer is based on the exact wording and concept, not simply on recognising a familiar option.
For this subject, learners should write the known quantities and units before choosing a formula, and distinguish a law from the example used to demonstrate it.
Chapter 6: focused MCQ revision
This chapter should be reviewed through its main definitions, examples, diagrams, comparisons and links with earlier Physics concepts.
Write a one-sentence reason for each corrected answer and note the textbook heading where the concept is explained.
Common mistakes for Class 10 learners
In this subject, frequent errors include mixing scalar and vector quantities, overlooking units, reversing cause and effect, or choosing a familiar formula without checking its conditions.
Review textbook exceptions, diagrams, units and similar-looking statements because these often cause avoidable objective-question errors. When the page marks an answer as incorrect, the next step should be to identify
the mistaken idea and verify it, rather than memorising the displayed answer letter.
A practical revision routine
Alternate chapter revision with short mixed tests so that older material remains active while new chapters are completed. Before attempting the MCQs, review definitions, symbols, unit conversions, graph shapes, diagram labels and the meaning of each term in a formula.
Complete a manageable set without notes, check the result, and divide errors into missing knowledge,
misunderstood concepts and careless reading. Revise the appropriate section before repeating the chapter.
How to review Chapter 6 after the quiz
List the questions you missed from Chapter 6 and write the textbook heading
connected with each one. Explain the correct idea in your own words, then return later and answer a
fresh set. This gives the chapter page a clear purpose: finding specific weaknesses in
Physics rather than only collecting a score.
Accuracy and responsible use
Explanations are provided where they exist in the question bank, but educational databases can contain
incomplete or mistaken material. Confirm disputed answers with an authoritative textbook or teacher.
Ahmad Learning Hub provides a practice resource and does not claim that a question will appear in an
examination or that every available item represents an official board question.
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