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Magnetism MCQ – Free RRB NTPC & Group D Physics Mock Test | TopperIQ

Magnetism MCQ – Free RRB NTPC & Group D Physics Mock Test | TopperIQ

RRB NTPC & Group D Physics Mock Test — Magnetism

Practice 25 free MCQ on Magnetism (Physics) for RRB NTPC, RRB Group D & Railway exams. Covers Magnetic Force, Magnetic Flux, Biot-Savart Law, Faraday's Law, Lenz's Law, Solenoid, Fleming's Rules, Transformer, Earth's Magnetism & Magnetic Materials — with 12-min timer, instant score & explanations in English, Hindi, Bengali & Nepali.

๐Ÿงฒ Magnetic Force〰️ Magnetic Flux⚡ Faraday's Law๐Ÿ”„ Lenz's Law๐ŸŒ€ Solenoid✋ Fleming's Rules๐Ÿ” Transformer๐ŸŒ Earth's Magnetism๐Ÿชจ Magnetic Materials๐Ÿ“ Biot-Savart Law
๐Ÿ“ 25 Questions⏱ 12 Minutes๐ŸŒ 4 Languages✅ Free & Instant Score๐Ÿ“„ PDF Scorecard

Magnetism Mock Test

Physics · RRB NTPC & Group D · 25 Questions · 12 Min

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    Frequently Asked Questions — Magnetism & Physics

    What is the SI unit of magnetic flux?
    The SI unit of magnetic flux is Weber (Wb). Magnetic flux ฮฆ = B·A·cosฮธ, where B is field strength (Tesla) and A is area (m²). 1 Wb = 1 T·m². The unit of magnetic field B itself is Tesla (T).
    What is Fleming's Left-Hand Rule?
    Fleming's Left-Hand Rule gives the direction of force on a current-carrying conductor in a magnetic field. Stretch the thumb, index finger, and middle finger mutually perpendicular: index finger → field (B), middle finger → current (I), thumb → force/motion (F). It is used in electric motors.
    What is Lenz's Law?
    Lenz's Law states that the induced current always opposes the change in magnetic flux that caused it. It is a consequence of the conservation of energy. If flux increases, induced current creates an opposing field; if flux decreases, it creates a supporting field.
    What is the difference between ferromagnetic, paramagnetic, and diamagnetic materials?
    Ferromagnetic (Fe, Ni, Co): strongly attracted, ฮผแตฃ ≫ 1. Paramagnetic (Al, Pt): weakly attracted, ฮผแตฃ slightly > 1. Diamagnetic (Cu, Bi, water): weakly repelled, ฮผแตฃ slightly < 1. Ferromagnetics lose magnetism above the Curie temperature and become paramagnetic.
    เคšुเคฎ्เคฌเค•เคค्เคต เคฎें RRB Group D เค•े เคฒिเค เค•ौเคจ เคธे เคธूเคค्เคฐ เคธเคฌเคธे เคฎเคนเคค्เคตเคชूเคฐ्เคฃ เคนैं?
    เคฎुเค–्เคฏ เคธूเคค्เคฐ: F = qvB sinฮธ (เคฒॉเคฐेเคจ्เคœ เคฌเคฒ), F = BIL sinฮธ (เคงाเคฐाเคตाเคนी เคคाเคฐ เคชเคฐ), ฮฆ = BA cosฮธ (เคšुंเคฌเค•ीเคฏ เคซ्เคฒเค•्เคธ), e = −N dฮฆ/dt (เคซैเคฐाเคกे เคจिเคฏเคฎ), B = ฮผ₀nI (เคชเคฐिเคจाเคฒिเค•ा), ฯ„ = mB sinฮธ (เคฌเคฒाเค˜ूเคฐ्เคฃ), Vs/Vp = Ns/Np (เคŸ्เคฐांเคธเคซाเคฐ्เคฎเคฐ)।
    เฆšুเฆฎ্เฆฌเฆ•เฆค্เฆฌ เฆฅেเฆ•ে RRB NTPC-เฆคে เฆ•োเฆจ เฆช্เฆฐเฆถ্เฆจเฆ—ুเฆฒো เฆฌেเฆถি เฆ†เฆธে?
    เฆธเฆฌเฆšেเฆฏ়ে เฆฌেเฆถি เฆ†เฆธে: F = qvB sinฮธ, ฮฆ = BA cosฮธ, e = −N ฮ”ฮฆ/ฮ”t, B = ฮผ₀nI (เฆธোเฆฒেเฆจเฆฏ়েเฆก), ฯ„ = mB sinฮธ, m = IA, เฆŸ্เฆฐাเฆจ্เฆธเฆซเฆฐ্เฆฎাเฆฐ เฆ…เฆจুเฆชাเฆค, เฆซ্เฆฒেเฆฎিং-เฆเฆฐ เฆจিเฆฏ়เฆฎ, เฆ•ুเฆฐি เฆคাเฆชเฆฎাเฆค্เฆฐা, เฆšৌเฆฎ্เฆฌเฆ• เฆฌিเฆš্เฆฏুเฆคি เฆ“ เฆจเฆคিเฆ•োเฆฃ।
    What is SONAR and how is magnetism related to it?
    While SONAR itself uses sound waves, it relies on electromagnets and transducers that convert electrical energy to sound and back — both principles depend on electromagnetic induction. Magnetic sensors are also used in submarines for detecting magnetic anomalies from the seafloor.
    Raghu Sir

    Posted by Raghu Sir