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Test: Conductivity of a Semiconductor - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: Conductivity of a Semiconductor

Test: Conductivity of a Semiconductor for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Conductivity of a Semiconductor questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Conductivity of a Semiconductor MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Conductivity of a Semiconductor below.
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Test: Conductivity of a Semiconductor - Question 1

 What is the SI unit of conductivity?

Detailed Solution for Test: Conductivity of a Semiconductor - Question 1

The formula of the conductivity is the σ=1/ρ.
So, the unit of resistivity is Ωm.
Now, the unit of conductivity becomes the inverse of resistivity.

Test: Conductivity of a Semiconductor - Question 2

Which of the following expressions doesn’t represent the correct formula for Drift current density?

Detailed Solution for Test: Conductivity of a Semiconductor - Question 2

The following formulae represent the correct expression for drift current density,
J=σE
And J=qnµE.

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Test: Conductivity of a Semiconductor - Question 3

 Does a semiconductor satisfy the ohm’s law?

Detailed Solution for Test: Conductivity of a Semiconductor - Question 3

 V=IR
J=σE
I/A=σ(V/L)
V=(L/ σA)*I=(ρL)*I/A=IR
Thus, above equation satisfies Ohm’s law.

Test: Conductivity of a Semiconductor - Question 4

 In which range of temperature, freeze out point begins to occur?

Detailed Solution for Test: Conductivity of a Semiconductor - Question 4

 At lower range of temperature, the concentration and conductivity decreases with lowering of the temperature.

Test: Conductivity of a Semiconductor - Question 5

Which of the following expression represents the correct formula for the conductivity in an intrinsic material?

Detailed Solution for Test: Conductivity of a Semiconductor - Question 5

Option b is the correct formula.

Test: Conductivity of a Semiconductor - Question 6

What is the voltage difference if the current is 1mA and length and area is 2cm and 4cm2 respectively?(ρ=2Ωm)

Detailed Solution for Test: Conductivity of a Semiconductor - Question 6

V=IR
R=ρl/(A)=2*2/4=100Ω
V=1mA*100
=0.1V.

Test: Conductivity of a Semiconductor - Question 7

 Is resistivity is a function of temperature?

Detailed Solution for Test: Conductivity of a Semiconductor - Question 7

Resistance depends on the temperature and the resistivity depends on the resistance, so now the resistivity depends on the temperature.

Test: Conductivity of a Semiconductor - Question 8

 What is the electric field when the voltage applied is 5V and the length is 100cm?

Detailed Solution for Test: Conductivity of a Semiconductor - Question 8

E=V/L=5/100cm=5V/m.

Test: Conductivity of a Semiconductor - Question 9

Calculate the average random thermal energy at T=300K?

Detailed Solution for Test: Conductivity of a Semiconductor - Question 9

Average random thermal energy=3/2*k*T=0.038eV.

Test: Conductivity of a Semiconductor - Question 10

In the above figure, a semiconductor having an area ‘A’ and length ‘L’ and carrying current ‘I’ applied a voltage of ‘V’ volts across it. Calculate the relation between V and A?

Detailed Solution for Test: Conductivity of a Semiconductor - Question 10

Option A, satisfies the Ohm’s law which is V=IR where R=(ρl)/A.

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