Materials and Components
In atomic physics, a state with l = 0 is called p state.
Answer: B
The state with l = 0 is called s state.
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The number of valence electrons in acceptor impurity are
Answer: C
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Paramagnetic materials have permanent magnetic dipoles but interaction between neighbouring dipoles is negligible.
Answer: A
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The law J = σE, where J is current density, σ is electrical conductivity and E is field strength is
Answer: A
It is another form of Ohm's law.
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Ferromagnetic materials
Answer: D
No answer description available for this question.
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The orientation polarization is
1.directly proportional to temperature
2.inversely proportional to temperature
3.inversely proportional to square of permanent dipole moment
4.directly proportional to square of permanent dipole moment.
Which of the above are correct?
Answer: D
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In terms of classical representation of electrons
Answer: A
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The colour code on a carbon resistor is red-red-black-silver. The value of resistor is
Answer: D
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Consider the following statement
If an electric field is applied to an n type semiconductor bar, the electrons and holes move in opposite directions due to their opposite charges. The net currents is
1.both due to electrons and holes with electrons as majority carriers
2.sum of hole and electron currents
3.difference between electron and hole currents.
Which of above statements are correct?
Answer: B
The net current is sum of currents due to holes and electrons.
In n type materials, electrons are majority carriers.
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If a capacitor C having selectivity factor Q is scaled down in all its dimensions by a factor K without any altering the dielectric material, the new capacitor will have capacitance and selectivity as
Answer: B
Since the dimension of plates is scaled down by K, the area decreases by a factor of K2, the distance between plates decreases by a factor of K.
Therefore, capacitance changes to 
.
The selectivity will not be affected.
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