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

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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

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Types of semiconductors
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The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be

(a) 90                            (b) 10

(c) 1.25                         (d) 100

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Applications of Transistor
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A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly

1. 10×1014 Hz                              2. 5×1014 Hz

3. 1×1014 Hz                                4. 20×1014 Hz

Concept Questions :-

Applications of PN junction
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The circuit is equivalent to

1. AND gate                              2. NAND gate

3. NOR gate                              4. OR gate 

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In the forward bias arrangement of a PN-junction diode

(a) The N-end is connected to the positive terminal of the battery

(b) The P-end is connected to the positive terminal of the battery

(c) The direction of current is from N-end to P-end in the diode

(d) The P-end is connected to the negative terminal of battery

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In a PN-junction diode 

1. The current in the reverse biased condition is generally very small

2. The current in the reverse biased condition is small but the forward biased current is independent of the bias voltage

3. The reverse biased current is strongly dependent on the applied bias voltage

4. The forward biased current is very small in comparison to reverse biased current

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The cut-in voltage for silicon diode is approximately

(a) 0.2 V                       (b) 0.6 V
(c) 1.1 V                       (d) 1.4 V

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Types of semiconductors
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The electrical circuit used to get smooth output from a rectifier circuit is called 

(a) Oscillator                          (b) Filter

(c) Amplifier                           (d) Logic gates

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