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. Because of the absence of holes. Electrons are the charge carriers in n- type semiconductors. Electron concentration is much less than hole concentration.

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

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

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

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

	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?
		Data inadequate P- type Either a or b N- type

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

	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 91.6 µA 9.16 A 0.916 µA

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