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Engineering Materials in EE

Engineering Materials in EE
The permanent magnets are made from which of following materials ?

 Soft iron.
 Paramagnetic.
 Ferromagnetic.
 Diamagnetic.

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Engineering Materials in EE
Indicate which of following material does not retain magnetism permanently

 soft iron.
 hardness steel.
 stainless steel.
 none of above.

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Engineering Materials in EE
Why diamond is very hard ?

 Because of large cohesive energy
None of these
 Because of covalent solid
 Because of high melting point

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Engineering Materials in EE
Susceptibility is negative for

 non magnetic substances.
 ferromagnetic substances.
 diamagnetic substances.
 none of above.

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Engineering Materials in EE
The intensity of magnetization, M, of a ferro magnetic solid

 is independent of temperature.
 decreases with increasing temperature.
 increases with increasing temperature.
 depends on method of heating.

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Engineering Materials in EE
What is the value of dielectric constant of air?

 none of these.
 1.
 0.
 Less than 1

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MORE MCQ ON Engineering Materials in EE

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