A silicon specimen is made into a P-type semi-conductor by dopping, on an average, one Indium atom per 5×107 silicon atoms. If the number density of atoms in the silicon specimen is 5×1028 atoms/m3 then the number of acceptor atoms in silicon per cubic centimeter will be:

(1) 2.5×1030 atoms/cm3                  

(2) 1.0×1013 atoms/cm3

(3) 1.0×1015 atoms/cm3                   

(4) 2.5×1036 atoms/cm3

Subtopic:  Types of Semiconductors |
 59%
From NCERT
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The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature

(1) Decreases exponentially with increasing band gap

(2) Increases exponentially with increasing band gap

(3) Decreases with increasing temperature

(4) Is independent of the temperature and the band gap

Subtopic:  Energy Band theory |
 64%
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A 2V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when its positive terminal is connected to A is 

(a) 0.2 A
(b) 0.4 A
(c) Zero
(d) 0.1 A

Subtopic:  PN junction |
 84%
From NCERT
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 In the circuit, if the forward voltage drop for the diode is 0.5V, the current will be 

(a) 3.4 mA
(b) 2 mA
(c) 2.5 mA
(d) 3 mA

Subtopic:  PN junction |
 87%
From NCERT
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Current in the circuit will be 


(a) 540A
(b) 550A
(c) 510A
(d) 520A

Subtopic:  Applications of PN junction |
 88%
From NCERT
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The diode used in the circuit shown in the figure has a constant voltage drop of 0.5 V at all currents and a maximum power rating of 100 milliwatts. What should be the value of the resistor R, connected in series with the diode for obtaining maximum current?

   

1. 1.5 Ω 

2. 5 Ω

3. 6.67 Ω

4. 200 Ω

Subtopic:  PN junction |
 61%
From NCERT
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In the following common emitter configuration an NPN transistor with current gain β = 100 is used. The output voltage of the amplifier will be 

(1) 10 mV

(2) 0.1 V

(3) 1.0 V

(4) 10 V

Subtopic:  Transistor (OLD NCERT) |
 67%
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A sinusoidal voltage of peak value 200 volts is connected to a diode and resistor R in the circuit shown so that half-wave rectification occurs. If the forward resistance of the diode is negligible compared to R the r.m.s voltage (in volt) across R is approximately

(1) 200                           

(2) 100

(3) 2002                         

(4) 280

Subtopic:  PN junction |
From NCERT
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The junction diode in the following circuit requires a minimum current of 1 mA to be above the knee point (0.7 V) of its I-V characteristic curve. The voltage across the diode is independent of current above the knee point. If VB = 5 V, then the maximum value of R so that the voltage is above the knee point, will be

(1) 4.3 kΩ                

(2) 860 kΩ

(3) 4.3 Ω                  

(4) 860 Ω

Subtopic:  PN junction |
 80%
From NCERT
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In the circuit given below, V(t) is the sinusoidal voltage source, voltage drop VAB(t) across the resistance R is

(1) Is half wave rectified

(2) Is full wave rectified

(3) Has the same peak value in the positive and negative half cycles

(4) Has different peak values during positive and negative half cycle

Subtopic:  Applications of PN junction |
From NCERT
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