Materials and Components
Which of the following are donor impurities?
1.Gold
2.Phosphorus
3.Boron
4.Antimony
5.Arsenic
6.Induim
Select the correct answer using the following codes
Answer: D
Donor impurities have five valence electrons.
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If a piece of wood is placed in a magnetic field
Answer: A
Wood is non-magnetic.
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At a temperature of about 1 K, aluminium is a
Answer: D
No answer description available for this question.
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In a piezoelectric crystal, the application of mechanical force will cause
Answer: B
Piezoelectric materials permit conversion of mechanical force into electrical energy.
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If q is charge on an electron, R is radius of electron orbit and ω is angular velocity of electron rotation, the magnetic dipole moment of electron in orbit is
Answer: C
No answer description available for this question.
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The number of valence electrons in donor impurity are
Answer: A
Donor impurity has 5 valence electrons (while silicon has 4 valence electrons).
Hence donor impurity can donate electrons.
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Assertion (A): If WF is Fermi energy, v is velocity of electron and m is mass of electron, then 
.
Reason (R): Conductivity of a metal depends on temperature and impurity concentration.
Answer: B
No answer description available for this question.
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Material which lack permanent magnetic dipoles are known as
Answer: B
Diamagnetic materials have no permanent magnetic diploes.
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The magnetic moment in units of Bohr magneton of a ferrous ion in any ferrite is
Answer: C
No answer description available for this question.
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Some typical examples of macroscopic quantities are
Answer: D
No answer description available for this question.
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