Diode characteristics (Viva voce) : Class 12 : Physics : Amrita Online Lab

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Diode characteristics

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	1)	Which of the following is the correct relation between electron and hole concentrations of an intrinsic semiconductor?
		n(e)> n(n) n(e) = n(n) n(e) = [n(n)]^2

	2)	Why do the n- type semiconductors are called so?
		Because of the absence of holes. Electrons are the charge carriers in n- type semiconductors. Electron concentration is much less than hole concentration. None of these.

	3)	What happens to the width of depletion layer of a p-n junction diode while forward biasing?
		None of these Decreases Remain fixed Increases

	4)	How are electrical conductivity (σ) and resistivity (ρ) of a semiconductor material is related?
		σ ∝ ρ σ ∝ ρ2 σ ∝ ρ-2 σ ∝ 1/ρ

	5)	The depletion region of a p-n junction diode is one which consists of
		Free charges Atoms Immobile charges Positive ions

	6)	Which of the following is equivalent to a revere biased p-n junction diode?
		A variable resistance Amplifier ON state of a switch OFF state of a switch

	7)	Find out the correct statement about semiconductors from the following?
		It has covalent bonding It is crystalline in nature All of the above are correct. It has a negative temperature coefficient

	8)	What is the type of extrinsic semiconductor obtained by adding a trivalent impurity to an intrinsic semiconductor?
		P- type N- type Either a or b Data inadequate

	9)	What is the behavior of an intrinsic semiconductor at absolute zero temperature?
		No change in its semiconducting nature Behaves like an insulator Becomes an extrinsic semiconductor Behaves like a metallic conductor

	10)	When a large reverse voltage is applied, the current flowing through a p-n junction diode at room temperature is 0.2µA. Calculate the current when a forward voltage of 0.1 V is applied across the junction?
		9.16 A 9.16 µA 91.6 µA 0.916 µA

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Developed by Amrita Vishwa Vidyapeetham & CDAC Mumbai. Funded by MeitY (Ministry of Electronics & Information Technology)

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