Materials And Components MCQ
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When a material is in superconducting state and a magnetic field is applied
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The unit for mmf is
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When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.
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The phenomenon of dielectric hysteresis occurs with
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Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is
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As the atoms of rare gases become larger, electronic polarizability
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The fact that domains exhibits spontaneous magnetisation is
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If a small amount of Cu is added to Ni conductor, then
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The most important set of specifications of transformer oil include
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Nickel is a non-magnetic material.
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The number of protons in a silicon atom are
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The elements which become superconducting at extremely low temperatures are
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If the number of atoms per unit volume of a monoatomic gas changes, the dielectric constant still remains constant.
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With increase in temperature, the electrical conductivity would
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The number of protons in a copper atom are
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Wood is a diamagnetic material.
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In a metal, the valence electrons
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Ferrimagnetic materials have anti parallel orientation of equal moments of permanent dipoles.
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The merger of hole and free electron is called
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Electrical contact materials used in switches, brushes, relay must possess
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The resistance of a photoconductor
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In an intrinsic semiconductor, at a given temperature T
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On the basis of the type of chemical bonds, solids may be classified into
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In van der walls crystals, there exists a high degree of stability of the outer electron shell.
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A vacant electronic state moves in the same direction as would a positive charge carrier.
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In solid insulator materials having only one kind of atom, the types of polarization which exist are
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At room temperature the number of conducting electrons in an intrinsic semiconductor
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Schrodinger wave equation is a
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Spontaneous magnetisation is characteristic of ferromagnetic materials.
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Many compounds also exhibit semiconducting properties.