Which one of the following statement is false?

(a) Pure Si doped with trivalent impurities gives a p-type semiconductor 

(b) Majority carries in a n-type semiconductor are holes

(c) Minority carries in a p-type semiconductor are electrons

(d) The resistance of intrinsic semiconductor decreases with increase of temperature 

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Types of semiconductors
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The device that can act as a complete electronic circuit is

1. Junction diode

2. Integrated circuit

3. Junction transistor

4. Zener diode

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A common emitter amplifier has a voltage gain of 50, an input impedance of 100Ω and an output impedance of 200Ω. The power gain the amplifier is

(a) 500         (b) 1000

(c) 1250       (d) 50

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Applications of Transistor
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The following figure shows a logic gate circuit with two inputs A and B and the output Y. The voltage waveforms of A, B and Y are as given

                            

The logic gate is 

(a) NOR gate                                                 (b) OR gate

(c) AND  gate                                                 (d) NAND gate

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For transistor action

(1) Base, emitter and collector regions should have similar size and doping concentrations.

(2) The base regions must be very thin and lightly doped.

(3) The emitter-base junction is forward biased and the base-collector junction is reverse biased.

(4) Both the emitter-base junction as well as the base-collector junction are forward biased.

Which of the following pairs of statements is correct?

(a)   (4) and (1)                                       (b)   (1) and (2)

(c)   (2) and (3)                                       (d)    (3) and (4)

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A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength 

(a) 6000 A                                    (b) 4000 nm

(c) 6000 nm                                  (d) 4000 A

Concept Questions :-

Applications of PN junction
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The symbolic representation of four logic gates 

                                       

                           (i)                                                                              (ii)

 

                                

                           (iii)                                                                              (iv)

The logic symbols for OR, NOT and NAND gates are respectively

(a)    (iii), (iv), (ii)                                            (b)   (iv), (i), (iii)

(c)    (iv), (ii), (i)                                              (d)   (i), (iii), (iv) 

Concept Questions :-

Please attempt this question first.

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A transistor is operated in common-emitter configuration at Vc=2volt such that a change in the base current from 100 μA to 200 μA produces a change in the collector current from 5 mA to 10 mA. The current gain is 

1. 75                                2. 100

3. 150                              4. 50

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Sodium has body centred packing.Distance between two nearest atom is 3.7A0. The lattice parameter is 

(a) 6.8 A0                                     (b) 4.3 A0

(c) 3.0 A0                                     (d) 8.6 A0

Concept Questions :-

Types of semiconductors
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If the lattice parameter for a crystalline structure is 3.6 A0, then the atomic radius in fcc crystal is

(a) 1.81 A0                                  (b) 2.10 A0

(c) 2.92  A0                                (d) 1.27  A0

Concept Questions :-

Types of semiconductors
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