Magnetic Materials Question & AnswersAugust 5, 2023 By Wat Electrical This article lists 100 Magnetic Materials MCQs for engineering students. All the Magnetic Materials Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Magnetic Materials.Magnetic materials are built with particles such as electrons and protons; They are classified based on their behavior that includes Ferro, Dia and Para. Basic magnetic materials includes Iron, Nickel and Cobalt. The structure with N-S polarity includes Dipole. Magnetic permittivity is the reason for strong magnetism in a ferro magnetism. When dipoles in a magnetic material are irregular then the magnet is de-magnetised.Neodymium, iron and Boron are the strong permanent magnet substances. A plot of magnetic field strength versus magnetization is the Hysteresis Loop in magnetic materials. The process of reducing the size of magnetic domains in a material to increase its magnetization is called domain wall movement.Neodymium magnetic material is widely used in the production of high-quality permanent magnets due to its exceptional strength and resistance to demagnetization 1). Which of the following are the types of magnetic behavior? Ferro Dia Para All the above None Hint2). Which of the following are the type of magnetic materials? Iron Cobalt Nickel All the above None Hint3). Magnetic based materials are placed in ____ type of magnetic field? Uniform Non uniform Linear Both a and c None Hint4). Magnetic materials are built with _____ particles? Electrons Protons Neutrons Both a and b None HintRead more about Electron flow5). Arrangement of electrons in a magnetic substance is called? Atom Proton Neutron Both a and b None Hint6). Which of the following type of magnetic behaviour is barely magnetized in magnetic type field? Dia Para Ferro Tria None Hint7). Which of the following are the examples of diamagnetic material? Gold Water Mercury All the above None Hint8). In which direction does magnetic dipoles align to magnetic field applied in diamagnetic substance? Same Opposite Perpendicular Adjacent None Hint9). ____ happens to opposing field of diamagnetic material when external based field is removed? Remains Disappears Doubles All the above None Hint10). Magnetic materials are disturbed due to ____ field? Electric Magnetic Electromagnetic Zero field None Hint11). Which of the following is structure with N-S polarity? Dipole Unipole Tripole Both a and c None Hint12). When dipoles in a magnetic material are irregular then the magnet is? Magnetised Demagnetised Semi-Magnetised Both a and b None Hint13). Which of the following is the reason for strong magnetism in a ferro magnetism? Magnetic susceptibility Magnetic permittivity Magnetic Di-polarity Both a and c None Hint14). When domains inside magnetic substance align properly, all sudden irrespective of external fields then the condition is called? Spontaneous Magnetization Rapid Magnetization Slow magnetization Zero Magnetization None Hint15). In which condition does spontaneous magnetization occurs? Hot Cold Warm Both b and c None Hint16). Elements which are attached to magnet is called? Magnetic Electric Massive Both a and c None Hint17). Which of the following are the types of magnetic materials? Magnetically hard Magnetically soft Magnetically semi solid Both a and b None Hint18). Magnetism in soft magnetic soft material is? Permanent Temporary Volatile Both b and c None Hint19). A magnet energised along with a screw is ____ type of magnetic material? Hard Soft Semi hard Semi soft None Hint20). Which of the following type of ions are aligned in a soft magnetic substance when magnet energised along with a screw? Iron Cobalt Ferrous Nickel None Hint21). Which of the following is the reason for de-magnetising hard type magnetic field? Temperature above curie Corrosion Opposed magnetism All the above None Hint22). Which is the other name for strong permanent magnet? Neodymium Boron Iron All the above None Hint23). A magnetic based materials behaviour is confirmed via _____ type of atoms, electrons? Paired Unpaired Partially paired Both a and b None Hint24). Which of the following type of magnetic type repeal on application of external magnetic field? Para Dia Ferro Both b and c None Hint25). Which of the following magnetic substance is extremely weak compared to other magnetic substance? Para Dia Ferro Both b and c None HintMagnetic Materials MCQ for Quiz 26). Which of the following are the properties of paramagnetic substances? Less susceptibility Medium magnetism Non-magnetic property All the above None Hint27). Which of the following are the substances of magnetic materials? Alnico Ferrite Rubber All the above None Hint28). Which of the following are the properties of Ferrite? Minimum production cost Component of Samarium Less magnetic power All the above None Hint29). Which of the following is the units of permeability? Henries Farads Henries per meter Meters None Hint30). A magnetic susceptibility is ___ proportional factor? Dimensionless Dimension Vector Scalar None Hint31). Which of the following is the Curie based temperature “K” of Cobalt? 1388 1043 948 630 None Hint32). Which of the following magnetic substance has the Curie temperature “1043K”? Co Fe Fe2O3 Ni None Hint33). Which of the following magnetic substance has the Curie temperature “948K”? Co Fe Fe2O3 Ni None Hint34). Which of the following magnetic substance has the Curie temperature “627K”? Co Fe Fe2O3 Ni None Hint35). Which of the following magnetic substance has the Curie temperature “386K”? Co Fe Fe2O3 CrO2 None Hint36). Which of the following magnetic substance has the Curie temperature “69K”? Co EuO Fe2O3 CrO2 None Hint37). Which of the following magnetic substance has the Curie temperature “88K”? Co Dy Fe2O3 CrO2 None Hint38). Which of the following components minimises melting point of ferro magnetic substance? B C Si All the above None Hint39). Which of the following is the temperature of Curie temperature? 570degree C 1060 F 600C Both a and b None Hint40). A antiferro based magnetic curie point is __ temperature? Neel temperature Anti-Curie temperature Hyper temperature All the above None Hint41). Which of the following are examples of anti-ferro magnetic substances? MnO MnS K All the above None Hint42). Which of the following is the melting point of manganese? 1246 degree C 1250 degree C 1122 degree C None Hint43). Which of the following is symbol for magnetization intensity? M X B C None Hint44). Which of the following is the formula for magnetic flux density? B=uH X=uH u=BH u=BI None Hint45). A parameter which measures field of magnetism is called? Magnetic susceptibility Magnetic polarity Magnetic field Magnetic permeability None Hint46). Which of the following is the equation of magnetic susceptibility? X=M/H X=MH H=X-M H=X+M None Hint47). If magnetic susceptibility is less than 0 then it is ___ type of magnetic substance? Dia Para Ferro Super-para None Hint48). If magnetic susceptibility is more than 0 then it is ___ type of magnetic substance? Dia Para Ferro Super-para None Hint49). If magnetic susceptibility is more than 1 then it is ___ type of magnetic substance? Dia Super-para Ferro Both b and c None Hint50). Which of the following is the equation for total magnetic field? B=B0+u0M B=B0-u0M B=B0/u0M B=B0*u0M None HintMagnetic Materials Questions for Interviews51). Which ancient civilization discovered naturally occurring magnetic materials? Egyptians Greeks Chinese Romans None Hint52). In what century did William Gilbert publish his work "De Magnete," laying the foundations for the study of magnetism? 14th century 15th century 16th century 17th century None Hint53). The first recorded use of a compass was by which civilization? Chinese Vikings Egyptians Greeks None Hint54). What magnetic material did Hans Christian Oersted use in his famous experiment that demonstrated the connection between electricity and magnetism? Iron Nickel Cobalt Copper None Hint55). What is the name of the magnetic alloy created by Oliver Heaviside and others, which significantly improved the performance of telegraph cables? Alnico Permalloy Ferrite Invar None Hint56). In which year did Karl Friedrich Gauss formulate the mathematical framework for understanding the behavior of magnetic materials? 1802 1820 1843 1882 None Hint57). Which French physicist coined the term "ferromagnetism" to describe materials with strong magnetic properties? André-Marie Ampère Pierre Curie Charles-Augustin de Coulomb Louis Néel None Hint58). The Curie temperature is the temperature at which a ferromagnetic material _____________________? Becomes non-magnetic Reverses its magnetic polarity Exhibits maximum magnetic susceptibility Shows no change in magnetic properties None Hint59). The discovery of giant magnetoresistance (GMR) in magnetic multilayers, leading to significant advancements in data storage technology, was made by ________________? Albert Fert and Peter Grünberg Marie Curie and Pierre Curie Nikola Tesla and Thomas Edison James Clerk Maxwell and Michael Faraday None Hint60). Which magnetic material is widely used in the production of high-quality permanent magnets due to its exceptional strength and resistance to demagnetization? Alnico Neodymium Samarium Cobalt Ceramic None Hint61). What is the Hysteresis Loop in magnetic materials? A graphical representation of magnetic domains A plot of magnetic field strength versus magnetization The behavior of magnetic domains in a magnetic material The process of aligning magnetic moments in a material None Hint62). In a hysteresis loop, the point where magnetization is maximum and external magnetic field is removed is called __________________? Coercivity Remanence Residual Magnetization Saturation None HintRead more about Dipole63). Which of the following is true regarding the hysteresis loop of a soft magnetic material? Large hysteresis loop area High coercivity Low permeability Low residual magnetization None Hint64). The area enclosed by a hysteresis loop represents _______________________? Magnetic energy loss Magnetic anisotropy Magnetic susceptibility Magnetic permeability None Hint65). Magnetic domains are ____________________? Atomic-sized magnets within a magnetic material Regions of the material with a uniform magnetic field Boundaries between ferromagnetic and non-magnetic regions Points where the magnetic field lines converge None Hint66). The process of reducing the size of magnetic domains in a material to increase its magnetization is called ___________________? Demagnetization Magnetic alignment Domain wall movement Magnetic saturation None Hint67). Which type of magnetic material is likely to have a well-defined and narrow hysteresis loop? Ferromagnetic material Paramagnetic material Antiferromagnetic material Diamagnetic material None Hint68). What is the significance of the coercivity in a hysteresis loop? It represents the magnetic field required to saturate the material. It indicates the magnetic field strength when the material is fully demagnetized. It shows the ease of magnetization reversal in a material It denotes the maximum magnetic field strength that a material can withstand. None Hint69). In a ferromagnetic material, the hysteresis loop’s shape depends on ___________________? Magnetic anisotropy Domain wall thickness Crystal lattice structure Magnetic susceptibility None Hint70). What happens to the hysteresis loop of a magnetic material as the temperature increases? It becomes narrower It shifts upwards along the magnetization axis It becomes broader It remains unchanged None Hint71). What is the main principle behind Spintronics? Utilizing electron charge for information processing Harnessing electron spin for information processing Exploiting nuclear spins for information storage Manipulating photon polarization for computing None Hint72). Which material is commonly used to achieve spin alignment in Spintronics devices? Silicon Copper Graphene Ferromagnetic materials None Hint73). What phenomenon allows for the conversion between charge and spin currents in Spintronics? Ohm’s Law Hall Effect Spin-Orbit Interaction Faraday’s Law None Hint74). What is the term used for the region between two magnetic domains with different orientations? Magnetic Junction Spin Barrier Spin-Flip Region Domain Wall None Hint75). Which Spintronics effect is based on the dependence of electrical resistance on the relative magnetization orientation? Giant Magnetoresistance Tunnel Magnetoresistance Anisotropic Magnetoresistance Spin Hall Effect None HintMagnetic Materials MCQ for Exams76). Which Spintronics application enables non-volatile memory with fast read and write operations? Magnetic Tunnel Junction Spin Hall Effect Magnetoresistance Random Access Memory Spin-FET None Hint77). What is the purpose of the Spin Hall Effect in Spintronics? Generating spin currents from charge currents Creating magnetic domains in ferromagnetic materials Enhancing the spin alignment in a magnetic field Measuring the spin-polarized current in a device None Hint78). Which material property is crucial for achieving long spin lifetimes in Spintronics applications? High electrical conductivity Low magnetic permeability Low spin-orbit coupling High Curie temperature None Hint79). What is the main advantage of Spintronics over conventional electronics? Higher operating voltage Lower power consumption Slower switching speed Unreliable data storage None Hint80). What does MRAM stand for? Magnetic Reversible Access Memory Magnetoresistive Accessible Memory Magnetic Random Access Memory Memory with Readable Access Magnet None Hint81). Which property of electrons is utilized in MRAM for data storage? Charge Spin Mass Velocity None Hint82). What type of memory technology is MRAM considered to be? Non-volatile Volatile Read-only Cache None Hint83). The basic storage element in MRAM is called a ____________________? Bit Byte Qubit Blox None Hint84). What is the primary advantage of MRAM over other memory technologies like DRAM and Flash? Faster read and write speed Lower cost Higher storage capacity Non-volatile nature None Hint85). MRAM utilizes the phenomenon of ________________ to store data in magnetic elements? Electrical polarization Magnetic polarization Ferroelectricity Phase change None Hint86). Which of the following is a potential application of MRAM? Temporary cache memory in CPUs Long-term data storage on hard drives Real-time data processing in graphics cards High-speed RAM for gaming consoles None Hint87). The switching speed of MRAM is primarily determined by __________________? Material’s resistance Material’s coercivity Applied magnetic field strength Material’s dielectric constant None Hint88). MRAM technology is based on the phenomenon of ____________ between two magnetic layers? Magnetic coupling Ferromagnetic resonance Magnetostatic interaction Spin-transfer torque None Hint89). Which of the following is a potential challenge faced by MRAM technology? High power consumption Limited scalability Limited endurance Slow read and write speeds None Hint90). Who proposed the Weiss Theory of Ferromagnetism? Pierre Curie Pierre Weiss Albert Einstein Max Planck None Hint91). According to the Weiss Theory, ferromagnetism arises due to _______________________? Random alignment of atomic spins Unpaired electrons in the material Magnetic domains in the material Cooperative alignment of atomic spins None Hint92). The Weiss molecular field is responsible for ______________________? Reducing magnetization in a ferromagnet Enhancing magnetization in a ferromagnet Stabilizing the atomic spins Preventing magnetic ordering None Hint93). What is the critical temperature (Curie temperature) in the Weiss Theory? The temperature at which ferromagnetic domains form The temperature at which magnetic ordering disappears The temperature at which ferromagnetism becomes paramagnetism The temperature at which Weiss molecular field becomes zero None Hint94). The Weiss molecular field aligns atomic spins _____________? Parallel to the external magnetic field Antiparallel to the external magnetic field Randomly with respect to the external magnetic field Orthogonal to the external magnetic field None Hint95). The Weiss Theory explains the origin of ferromagnetism in terms of ________________? Magnetic domains Exchange interactions Magnetic dipole-dipole interactions Electron spin-orbit coupling None Hint96). What is the primary characteristic of a ferromagnetic material above its Curie temperature? Spontaneous magnetization High magnetic susceptibility Low electrical conductivity Randomly oriented atomic spins None Hint97). The Weiss molecular field can be affected by _________________? External magnetic field strength Temperature changes Material's crystal structure All of the above None Hint98). Which interaction is responsible for aligning atomic spins in the same direction in ferromagnetic materials? Dipole-dipole interaction Van der Waals interaction Exchange interaction London dispersion forces None Hint99). The Weiss Theory is a precursor to understanding the behavior of ___________________? Diamagnetic materials Paramagnetic materials Antiferromagnetic materials Ferrimagnetic materials None Hint100). Which element is commonly used as a magnetic resonance imaging contrast agent due to its paramagnetic properties? Iron Gadolinium Cobalt Manganese None HintFor More MCQsMagnetic Circuit MCQsHysteresi Motor MCQsMagnetism and Electromagnetism MCQs Time's up
