ECE · all questions

Materials And Components
practice.

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Questions

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Q101

Open question

Which one of the following is a ceramic insulator?

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Q102

Open question

Consider the following statements:

E_{f}^{n}

and

E_{f}^{p}

are the energies of the Fermi levels on the n and p sides of p-n junction diodes, respectively. They will vary with applied as follows:
1.

E_{f}^{n}

E_{f}^{p}

with bias applied.
2.

E_{f}^{n}

increase and

E_{f}^{p}

decrease with forward bias.
3.

E_{f}^{n}

decrease and

E_{f}^{p}

increase with forward bias.
4.

E_{f}^{n}

increase and

E_{f}^{p}

decreases with reverse bias.
5.

E_{f}^{n}

increase and

E_{f}^{p}

decrease with reverse bias.
Select the correct answer using the options given below:

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Q103

Open question

Materials, whose specific resistance abruptly falls at very low temperature, are called

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Q104

Open question

Magnetostriction is a phenomenon of

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Q105

Open question

A heterojunction is formed between

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Q106

Open question

Consider the following statements about semiconductors?
1. The forbidden energy gap in semiconductors lies between the valence band and conduction band.
2. The forbidden energy gap in germanium at 0 K is about 0.71 eV.
3. Semiconductors have negative temperature coefficient of resistivity.
Which of the statements given above are correct?

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Q107

Open question

Consider the following statements:
In the case of a superconductor
1. the magnetic flux density is zero
2. the relative permeability is high
3. diamagnetism is large
4. transition temperature varies with isotopic mass
Of these statements

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Q108

Open question

Some ceramic superconductors become superconducting

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Q109

Open question

Consider the following statements:
1. Type-I superconductors undergo abrupt transition to the normal state above a critical magnetic field.
2. Type-II superconductors are highly technologically useful super-conductors because the incidence of a second critical field in them is useful in the preparation of high field electromagnets.
Which of the above statements is/are correct?

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Q110

Open question

Which of the following exhibit electric hysteresis?

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Q111

Open question

Polystyrene is a

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Q112

Open question

The unit of polarization is the same as that of