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)]^2 n(e) = n(n)

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

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

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

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

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

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

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

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

	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 µA 0.916 µA 91.6 µA 9.16 A

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

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