In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an: 


     

1. p-type semiconductor
2. insulator
3. metal
4. n-type semiconductor

Subtopic:  Energy Band theory |
 75%
From NCERT
AIPMT - 2007
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The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance R1 will be:
     

1. 2.5 A 2. 10.0 A
3. 1.43 A 4. 3.13 A
Subtopic:  PN junction |
 86%
From NCERT
NEET - 2016
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A forward-biased diode is treated as:

1. an open switch with infinite resistance.
2. a closed switch with a voltage drop of 0 V.
3. a closed switch in series with a battery with voltage of 0.7 V.
4. a closed switch in series with small resistance and a battery.
Subtopic:  PN junction |
From NCERT
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A half-wave rectifier voltage is fed to a load resistor. For which part of the cycle, the load current will flow?

1. \(0^\circ-90^\circ\) 2. \(90^\circ-180^\circ\)
3. \(0^\circ-180^\circ\) 4. \(0^\circ-360^\circ\)

Subtopic:  Rectifier |
 54%
From NCERT
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If the input to the NOT gate is A, its output is:
1. 0
2. 1
3. A
4. \(\bar{A}\)

Subtopic:  Logic gates |
 82%
From NCERT
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The combination of gates shown below is equivalent to:
                
1. AND gate

2. XOR gate

3. NOR gate

4. NAND gate

Subtopic:  Logic gates |
 68%
From NCERT
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In the given circuit, PN-junction diodes D1, D2, and D3 are ideal. For the following potential of A and B, the correct increasing order of resistance between A and B will be:

          

i.  –10V, –5V
ii.  –5V, –10V
iii.  –4V, –12V

1. (i) < (ii) < (iii)
2. (iii) < (ii) < (i)
3. (ii) = (iii) < (i)
4. (i) = (iii) < (ii)

Subtopic:  PN junction |
 63%
From NCERT
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The depletion layer in the P–N junction region is caused by:

1. the drift of holes
2. diffusion of charge carriers
3. migration of impurity ions
4. drift of electrons

Subtopic:  PN junction |
 76%
From NCERT
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The output in the circuit shown in the figure taken across a capacitor is:

          

1. 2.
3. 4.
Subtopic:  Applications of PN junction |
From NCERT
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Logic gates X and Y have the truth tables shown below:

When the output of X is connected to the input of Y, the resulting combination is equivalent to a single:

1. NOT gate

2. OR gate

3. NAND gate

4. AND gate

Subtopic:  Logic gates |
 82%
From NCERT
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