The barrier potential of a p-n junction depends on

(i)type of semiconductor material

(ii)amount of doping

(iii)temperature

Which one of the following is correct

1. (i) and (ii)only

2. (ii) only

3. (ii) and (iii)only

4. (i),(ii) and (iii)

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In a n-type semiconductor, which of the following statement is true ?

(a) Electrons are majority carriers and trivalent atoms are dopants

(b) Electrons are minority carriers and pentavalent atoms are dopants

(c) Holes are minority carriers and pentavalent atoms are dopants

(d) Holes are majority carriers and trivalent atoms are dopants

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Types of semiconductors
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The output (x) of logic circuit shown in figure will be 

 

(a) X=A=·B=

(b) X=A.B¯

(c)X=A·B

(d)X=A+B¯

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Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is

(a)0.75A                              (b)zero

(c)0.25A                               (d)0.5A    

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In a CE transistor amplifier, the audio signal voltage across the collector resistance of 2 kΩ is 2V. If the base resistance is 1 kΩ and the current amplification of the transistor is 100, the input signal voltage is

1. 0.1 V                                         2. 1.0 V

3. 1mV                                         4. 10mV

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C and Si both have same lattice structure,having 4 bonding electrons in each.However, C is insulator whereas Si is intrinsic semiconductor. This is because 

1. in case of C, the valence band is not completely filled at absolute zero temperature

2. in case of C,the condition band is partly filled even at absolute zero temperature 

3. the four bonding electrons in the case of C lie in the second orbit,Whereas in the case of Si they lie in the third

4 .the four bonding electrons in the case of C lie in the third orbit, whereas for Si they lie in the fourth orbit

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Types of semiconductors
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Transfer characteristic [output voltage V0 vs input voltage Vi] for a base biased transistor in CE configuration is as shown in the figure.For using transistor as a switch, it is used 

(a) in region III

(b) both in region (I) and (III)

(c) in region II

(d) in region I

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The figure shows a logic circuit with two inputs A and B and the output C.The voltage wave forms across A, B and C are as given.The logic circuit gate is 

1. OR gate                                          2. NOR gate

3. AND gate                                        4. NAND gate

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The input resistance of a silicon transistor is

100 Ω. Base current is changed by 40 μA

which results in a change in collector current

by 2 mA. This transistor is used as a common-

emitter amplifier with a load resistance of 4 kΩ.

The voltage gain of the amplifier is

1. 2000

2. 3000

3. 4000

4. 1000

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To get an output Y=1 in given circuit, which

of the following input will be correct ?

      A     B      C                   A     B     C

1.  1     0       0             2.  1     0     1

3. 1      1       0             4.  0     1     0

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