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What is the 'SI Unit' of Magnetic Flux?
चुंबकीय फ्लक्स (Magnetic Flux) का 'SI मात्रक' क्या है?
(A) Tesla
(B) Henry
(C) Weber
(D) Coulomb
✅ Answer & Explanation
Sahi jawab: C) WeberExplanation: Magnetic flux ka SI unit Weber (Wb) hota hai, jabki Tesla magnetic field ya flux density ka unit hota hai.
What is the 'CGS unit' of Magnetic Flux?
चुंबकीय फ्लक्स की 'CGS इकाई' क्या है?
(A) Maxwell
(B) Weber
(C) Gauss
(D) Tesla
✅ Answer & Explanation
Sahi jawab: A) MaxwellExplanation: Magnetic flux ka CGS unit Maxwell hota hai, aur 1 Weber = 10^8 Maxwell ke barabar hota hai.
What is the value of 'Earth's Magnetic Field' approx at the surface?
पृथ्वी की सतह पर 'चुंबकीय क्षेत्र' का अनुमानित मान क्या है?
(A) 1 Tesla
(B) 100 Tesla
(C) Zero
(D) 0.3 to 0.6 Gauss
✅ Answer & Explanation
Sahi jawab: D) 0.3 to 0.6 GaussExplanation: Earth ki surface par magnetic field bohot weak hoti hai, lagbhag 0.3 se 0.6 Gauss (yaani lagbhag 10^-4 Tesla).
Which material is used for the 'Core' of high-frequency transformers?
उच्च आवृत्ति वाले ट्रांसफार्मर के 'कोर' के लिए किस सामग्री का उपयोग होता है?
(A) Soft Iron
(B) Ferrites
(C) Steel
(D) Copper
✅ Answer & Explanation
Sahi jawab: B) FerritesExplanation: High-frequency transformers me Ferrites use karte hain kyunki inki electrical resistivity bohot zyada hoti hai, jisse eddy current losses bohot kam ho jaate hain.
What is the 'Self Inductance' of a coil if a current of 2A produces a flux of 5 Weber?
एक कुंडली का 'स्व-प्रेरकत्व' क्या होगा यदि 2A करंट पर फ्लक्स 5 वेबर है?
(A) 10 Henry
(B) 2.5 Henry
(C) 50 Henry
(D) 0.4 Henry
✅ Answer & Explanation
Sahi jawab: B) 2.5 HenryExplanation: Formula Phi = L * I hota hai. Isliye L = Phi / I = 5 / 2 = 2.5 Henry nikal kar aayega.
What happens to the 'Permeability' of a magnetic material when it is heated?
गर्म करने पर पदार्थ की 'पारगम्यता' का क्या होता है?
(A) Increases
(B) Remains same
(C) Decreases
(D) Becomes zero instantly
✅ Answer & Explanation
Sahi jawab: C) DecreasesExplanation: Heat badhane par thermal agitation (vibrations) atomic dipoles ka alignment bigad deta hai, isliye magnetic permeability kam ho jaati hai.
Which 'Rule' gives the direction of magnetic field due to a circular current loop?
वृत्ताकार करंट लूप के कारण चुंबकीय क्षेत्र की दिशा कौन सा 'नियम' देता है?
(A) Lenz's Law
(B) Right-hand Palm Rule / Thumb Rule
(C) Ohm's Law
(D) Faraday's Law
✅ Answer & Explanation
Sahi jawab: B) Right-hand Palm Rule / Thumb RuleExplanation: Right-hand rule ke hisab se agar fingers current ke raste par curl karein, toh thumb loop ke center par magnetic field ki direction batata hai.
What is a 'Neutral Point' in a magnetic field?
चुंबकीय क्षेत्र में 'उदासीन बिंदु' (Neutral Point) क्या है?
(A) Point of maximum field
(B) Point where resultant magnetic field is zero
(C) North pole coordinate
(D) Center of core
✅ Answer & Explanation
Sahi jawab: B) Point where resultant magnetic field is zeroExplanation: Neutral point wo sthan hota hai jahan bar magnet ki external field Earth ke horizontal component ko bilkul cancel kar deti hai, jisse net field zero ho jati hai.
Which device primarily operates on the principle of 'Mutual Induction'?
कौन सा उपकरण 'अन्योन्य प्रेरण' (Mutual Induction) का उपयोग करता है?
(A) Electric Motor
(B) Battery
(C) Incandescent Bulb
(D) Transformer
✅ Answer & Explanation
Sahi jawab: D) TransformerExplanation: Transformer mutual induction par kaam karta hai, jisme primary coil ka badalta hua magnetic flux secondary coil me voltage induce karta hai.
The 'Magnetic Field' at a far point on the axis of a circular current loop is proportional to:
वृत्ताकार कुंडली के अक्ष पर किसी दूर स्थित बिंदु पर 'चुंबकीय क्षेत्र' किसके समानुपाती होता है?
(A) 1/r^3
(B) 1/r
(C) 1/r^2
(D) r^2
✅ Answer & Explanation
Sahi jawab: A) 1/r^3Explanation: Circular coil ke axis par kaafi doori (x >> R) par magnetic field magnetic dipole ki tarah behave karti hai aur 1/r^3 ke inverse cube law ko follow karti hai.
What is the 'Magnetic Susceptibility' (chi) for 'Superconductors'?
'अतिचालकों' (Superconductors) के लिए 'चुंबकीय प्रवृत्ति' क्या है?
(A) 1
(B) 0
(C) -1
(D) Infinite
✅ Answer & Explanation
Sahi jawab: C) -1Explanation: Superconductors perfect diamagnetism exhibit karte hain (Meissner effect), jiske karan inki magnetic susceptibility chi = -1 hoti hai.
Which instrument uses a suspended magnet to measure the horizontal component of Earth's field?
पृथ्वी के क्षेत्र को मापने के लिए कौन सा उपकरण 'लटके हुए चुंबक' का उपयोग करता है?
(A) Dip circle
(B) Vibration Magnetometer
(C) Ammeter
(D) Galvanometer
✅ Answer & Explanation
Sahi jawab: B) Vibration MagnetometerExplanation: Vibration Magnetometer me suspended magnet ke oscillation time period ko measure karke Earth ki horizontal magnetic field (B_H) calculate ki jaati hai.
The total 'Magnetic Induction' (B) is related to 'H' and 'I' by which relation?
'B', 'H' और 'I' में क्या संबंध है?
(A) B = mu_0 * (H + I)
(B) B = H / I
(C) B = H - I
(D) B = mu_0 * (H - I)
✅ Answer & Explanation
Sahi jawab: A) B = mu_0 * (H + I)Explanation: Material ke andar total magnetic induction applied field aur material ke induced magnetization ka sum hota hai: B = mu_0 * (H + I).
What is the unit Weber in terms of Volt and Second?
वोल्ट-सेकंड के संदर्भ में 'फ्लक्स' की इकाई वेबर क्या है?
(A) 1 Weber = 1 V/s
(B) 1 Weber = 1 s/V
(C) 1 Weber = 1 V-s
(D) 1 Weber = 1 V/s^2
✅ Answer & Explanation
Sahi jawab: C) 1 Weber = 1 V-sExplanation: Faraday law e = dPhi/dt se flux Phi = e * t banta hai, isliye 1 Weber = 1 Volt-second hota hai.
How does the 'Coercivity' of 'Steel' compare to that of 'Soft Iron'?
'नरम लोहे' की तुलना में 'स्टील' की 'निग्राहिता' क्या है?
(A) Much Lower
(B) Much Higher
(C) Equal
(D) Zero
✅ Answer & Explanation
Sahi jawab: B) Much HigherExplanation: Steel ki coercivity soft iron se kaafi zyada hoti hai, yaani ise demagnetize karne ke liye strong reverse field chahiye hoti hai. Isliye ye permanent magnet banane ke liye best hai.
Which class of substances shows magnetic properties primarily due to paired electrons cancelling each other's spin?
'युग्मित इलेक्ट्रॉनों' के कारण कौन सा 'पदार्थ' चुंबकीय गुण दिखाता है?
(A) Paramagnetic
(B) Ferromagnetic
(C) Diamagnetic
(D) Antiferromagnetic
✅ Answer & Explanation
Sahi jawab: C) DiamagneticExplanation: Diamagnetic materials me electrons paired hote hain jisse net dipole moment zero ho jata hai, aur external field lagane par Lenz's law ki wajah se opposing weak magnetism show hota hai.
What is the 'Angle of Declination' used for in navigation?
नेविगेशन में 'दिकपात कोण' का उपयोग किसलिए होता है?
(A) Measuring ocean depth
(B) Correcting compass to find True Geographic North
(C) Measuring magnetic dip angle
(D) Calculating ship speed
✅ Answer & Explanation
Sahi jawab: B) Correcting compass to find True Geographic NorthExplanation: Compass needle magnetic north ki taraf point karti hai, isliye geographic (true) north pata karne ke liye declination angle ka correction lagana padta hai.
What happens when a ferromagnetic substance is heated beyond its 'Curie Point'?
यदि चुंबक को उसके 'क्यूरी बिंदु' से आगे गर्म किया जाए तो क्या होगा?
(A) It becomes paramagnetic
(B) Magnetism increases significantly
(C) It transforms into a superconductor
(D) It becomes diamagnetic
✅ Answer & Explanation
Sahi jawab: A) It becomes paramagneticExplanation: Curie temperature ke upar thermal energy magnetic domains ko tod deti hai, jisse ferromagnetic material simple paramagnetic substance me convert ho jata hai.
On which physical property is 'Magnetic Shielding' based?
'चुंबकीय परिरक्षण' किस पर आधारित है?
(A) Magnetic reflection
(B) High permeability of enclosing materials
(C) Perfect electrostatic insulation
(D) Total absorption of charge
✅ Answer & Explanation
Sahi jawab: B) High permeability of enclosing materialsExplanation: Mu-metal ya soft iron jaise high permeability wale substances magnetic field lines ko apne andar se guzarne ka easy path dete hain, jisse andar rakha instrument shielded rehta hai.
If a dip circle needle points vertically at 90 degrees, where is the apparatus located?
'नति वृत्त' चुंबकीय मध्याह्न में सेट है और सुई 90° दिखाती है। यह कहाँ स्थित है?
(A) Magnetic Equator
(B) 45 degree Latitude
(C) Tropic of Cancer
(D) Magnetic Pole
✅ Answer & Explanation
Sahi jawab: D) Magnetic PoleExplanation: Earth ke magnetic poles par field bilkul vertical hoti hai aur horizontal component zero hota hai, isliye dip needle 90 degree par khadi ho jaati hai.
What is the 'Intensity of Magnetization' (I or M) for a perfect vacuum?
निर्वात के लिए 'चुंबकन की तीव्रता' क्या है?
(A) Zero
(B) Infinite
(C) 1
(D) -1
✅ Answer & Explanation
Sahi jawab: A) ZeroExplanation: Magnetization per unit volume tabhi hota hai jab matter me atomic dipoles hon. Vacuum me koi atoms nahi hote, isliye I = 0 hota hai.
What is the defining ratio for 'Magnetic Permeability' (mu)?
'चुंबकीय पारगम्यता' किसका अनुपात है?
(A) H / B
(B) B * H
(C) B / H
(D) 1 / (B * H)
✅ Answer & Explanation
Sahi jawab: C) B / HExplanation: Magnetic permeability mu = B / H hota hai, jo magnetic induction aur magnetizing field strength ka ratio hai.
What is the 'Magnetic Susceptibility' (chi) of a Diamagnetic substance?
एक प्रति-चुंबकीय पदार्थ की 'चुंबकीय प्रवृत्ति' (chi) क्या होती है?
(A) Large and Positive
(B) Small and Negative
(C) Small and Positive
(D) Zero
✅ Answer & Explanation
Sahi jawab: B) Small and NegativeExplanation: Diamagnetic materials external field ke opposite weakly magnetize hote hain, isliye inki susceptibility choti aur negative (-1 <= chi < 0) hoti hai.
Which of the following substances is weakly repelled by a strong magnetic field?
कौन सा पदार्थ एक शक्तिशाली चुंबकीय क्षेत्र द्वारा थोड़ा प्रतिकर्षित होता है?
(A) Iron
(B) Aluminium
(C) Water
(D) Nickel
✅ Answer & Explanation
Sahi jawab: C) WaterExplanation: Water, Bismuth, aur Copper diamagnetic hote hain, isliye ye magnetic field ke stronger parts se weaker parts ki taraf repel hote hain.
What is the mathematical relation between 'Relative Permeability' (mu_r) and Susceptibility (chi)?
सापेक्ष पारगम्यता (mu_r) और प्रवृत्ति (chi) के बीच क्या संबंध है?
(A) mu_r = 1 - chi
(B) mu_r = chi / mu_0
(C) mu_r = 1 + chi
(D) mu_r = 1 / chi
✅ Answer & Explanation
Sahi jawab: C) mu_r = 1 + chiExplanation: Formula B = mu_0 * (H + M) se derive karne par mu_r = 1 + chi relation nikal kar aata hai.
Which physical phenomenon is utilized in the 'Magnetic Braking' systems of modern high-speed trains?
उच्च गति वाली ट्रेनों की 'चुंबकीय ब्रेकिंग' में किस घटना का उपयोग होता है?
(A) Self Induction
(B) Mutual Induction
(C) Peltier Effect
(D) Eddy Currents
✅ Answer & Explanation
Sahi jawab: D) Eddy CurrentsExplanation: Metal wheels ya tracks me produce hone wali Eddy currents motion ka virodh karti hain (Lenz's law), jisse bina kisi mechanical wear-and-tear ke train smooth rukti hai.
Why does a transformer require an alternating current (AC) to operate rather than direct current (DC)?
ट्रांसफार्मर केवल AC के साथ ही क्यों काम करता है, DC के साथ क्यों नहीं?
(A) DC destroys the winding insulation immediately
(B) Transformers require continuously changing magnetic flux to induce voltage
(C) AC decreases the coil resistance to absolute zero
(D) DC voltage cannot flow through copper wire
✅ Answer & Explanation
Sahi jawab: B) Transformers require continuously changing magnetic flux to induce voltageExplanation: Faraday law ke mutabiq voltage induce karne ke liye dPhi/dt (changing flux) zaroori hai. Constant DC me flux steady rehta hai, isliye secondary coil me koi voltage induce nahi hota.
Which fundamental law determines the 'Polarity' and direction of an induced EMF?
प्रेरित EMF की 'ध्रुवता' (Polarity) जानने के लिए किस नियम का उपयोग होता है?
(A) Lenz's Law
(B) Ampere's Circuital Law
(C) Coulomb's Law
(D) Biot-Savart Law
✅ Answer & Explanation
Sahi jawab: A) Lenz's LawExplanation: Lenz's Law batata hai ki induced current ki direction aisi hoti hai ki wo usi flux change ka virodh kare jisne use produce kiya hai.
What is the CGS unit of 'Magnetic Field Strength' (H)?
CGS में 'चुंबकीय क्षेत्र तीव्रता' (H) की इकाई क्या है?
(A) Gauss
(B) Tesla
(C) Oersted
(D) Maxwell
✅ Answer & Explanation
Sahi jawab: C) OerstedExplanation: CGS system me B ki unit Gauss hoti hai, jabki H (magnetizing force) ki unit Oersted hoti hai.
Which material is used in magnetic recording tapes for data storage?
रिकॉर्डिंग के लिए 'चुंबकीय टेप' में किस पदार्थ का उपयोग होता है?
(A) Aluminium
(B) Chromium Dioxide (CrO_2)
(C) Pure Copper
(D) Silicon
✅ Answer & Explanation
Sahi jawab: B) Chromium Dioxide (CrO_2)Explanation: Magnetic tapes me Chromium Dioxide (CrO_2) ya gamma-Fe2O3 ke ferromagnetic particles use hote hain jo data ko stable magnetization ke form me store karte hain.
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