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1747.

Consider the following metals:
1. Zinc.
2. Gold.
3. Silver.
4. Copper.
The correct sequence of the increasing order of their resistivities is
a. 4, 3, 1, 2
b. 3, 4, 2, 1,
c. 4, 3, 2, 1
d. 3, 4, 1, 2

asked in Electrical Paper-1, 1997

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1748.

The residual resistivity of metals
a. Is essentially independent of temperature
b. Increase linearly with increasing temperature
c. Decrease linearly with increasing temperature
d. Initially increases linearly with temperature and then remains constant.

asked in Electrical Paper-1, 1997

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1749.

Which one of the following materials is piezoelectric?
a. Pb₂Au
b. Ba Ti O₃
c. Mg A1₂O₄
d. Ni Fe₂O₄

asked in Electrical Paper-1, 1997

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1750.

Consider the following materials:
1. Pure silica
2. Bakelite
3. Hard rubber
4. Paraffin
The correct sequence of the DECREASING order of loss angle (60 Hz) these dielectric materials is :
a. 1, 2, 3, 4
b. 1, 4, 3, 2
c. 4, 1, 2, 3
d. 4, 3, 1, 2

asked in Electrical Paper-1, 1997

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1751.

Which one of the following polarization mechanisms/ sets of mechanisms contribute (s) to the static dielectric constant of a homopolar neutral dielectric?
a. Electronic
b. Electronic and ionic
c. Electronic, ionic and dipolar
d. Electronic, and dipolar

asked in Electrical Paper-1, 1997

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1752.

As the temperature of a ‘p’ type semiconductor is gradually and continuously increased, the Fermi level will move
a. Into the valence band
b. Into the conduction band
c. Towards the middle of the forbidden gap
d. Into the region between the acceptor level and the valence band

asked in Electrical Paper-1, 1997

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