Test Details

Semiconductor Electronics: Materials, Devices and Simple Circuits

Onra

Apr 18, 9:40 PM

90 minutes

Apr 18, 11:10 PM

50.0 marks

MCQ

30 questions

Mr. Adarsh Tiwari

MSc ( Physics )

Class Details

Physics

Class 12

Physics

Aap ka dimag ik universe k barabar hai arthat is uniiverse ka sara gyan aapke mind me hai bs. Jarurat hai to ise active krne ka Aap ise active kr skte hai Apne neuron ko active kr k aur neuron tabhii active hoga jb aap hard work krenge aur study ko mata pita smjh kr uski sewa kijiye bina krm ki chinta kiye huwe Thank you

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Question Text

Question 1 :
In a metal, the separation between conduction band and valence band is of the order

Question 2 :
What is the resistivity of a pure semiconductor at absolute zero ?

Question 3 :
In an intrinsic semiconductor, if $N_e$ is the number of electrons in the conduction band and $N_p$ is the number of holes in the valence band then.

Question 4 :
What is the optimum band gap energy for a material to be considered as a semiconductor?

Question 5 :
The relationship between band gap energy and temperature can be described by ____________.

Question 8 :
The energy gap in case of which of the following is less than $3 eV$?

Question 9 :
The magnitude of the force between a pair of conductors, each of length 110 cm, carrying a current of 10 A and separated by a distance of 10 cm is

Question 12 :
Which of the following is an example of a direct band gap intrinsic semiconductor?

Question 13 :
When the conductivity of a semiconductor is only due to breaking of covalent bonds, the semiconductor is called

Question 18 :
Among the following, the wrong statement in the case of semiconductor is:

Question 21 :
Wire $P$ and $Q$ have the same resistance at a ordinary room temperature .When heated resistance at a ordinary room temperature .When heated resistance of $P$ increases and that of $Q$ decreases. we conclude that

Question 24 :
Assertion: The various energy bands in a solid may or may not overlap depending on the structure of the solid. Reason: If they do not overlap then the intervals between them represent energies which the electrons in the solid cannot have.

Question 26 :
Mobilities of electrons and holes in a sample of intrinsic germanium at room temperature are $0.36m^2V^{-1}s^{-1}$ and $0.17m^2V^{-1}s^{-1}$. The electron and hole densities are each equal to $2.5\times 10^{19}m^3$. The electrical conductivity of germanium is

Question 27 :
An electron hole pair is formed when light of maximum wavelength $6000\overset {\circ}{A}$ is incident on the semiconductor. What is the band gap energy of the semiconductor? $(h = 6.62\times 10^{-34} J-s)$.

Question 28 :
 A transformer has 500 turns in its primary and 1000 turns in its secondary winding.The primary voltage is 200 V and the load in the secondary is 100 ohm.Calculate the current in the primary,assuming it to be a ideal transformer.

Question 29 :
The energy gap of silicon is $1.14\ eV$. The maximum wavelength at which silicon starts energy absorption, will be ($h = 6.62$ $\times$ $ 10$ $^{-34}$ $Js$, $c = 3$ $\times$ $10$ $^8$ $ m/s$)

Question 30 :
A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of:

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