What is the reading of the ideal ammeters \(A_1\) and \(A_2\) connected in the given circuit diagram, if \(\mathrm{p\text-n}\) junction diodes are ideal?

   

1. \(2\) A and zero
2. \(3\) A and \(2\) A
3. \(2\) A and \(3\) A
4. zero and \(2\) A

Subtopic:  PN junction |
 83%
From NCERT
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Which of the following graphs may correctly represent the variation of current \((I)\) with potential difference \((V)\) across a zener diode?
1. 2.
3. 4.
Subtopic:  Applications of PN junction |
 88%
From NCERT
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The combination of gates shown in the diagram is equivalent to:
              

1. OR
2. AND
3. NAND
4. NOT

Subtopic:  Logic gates |
 73%
From NCERT
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A Zener diode is used to obtain a constant voltage. If applied voltage \(\text V\) changes, then:
(\(\text V\) is more than Zener voltage)
             

1. \(i_{1}\) and \(i_{2}\) change.
2. \(i_{2}\) and \(\text V_{0}\) change and \(i_{3}\) remains constant.
3. \(i_{2}\) and \(\text V_{0}\) don't change while \(i_{3}\) changes.
4. \(i_{3}\) and \(\text V_{0}\) don't change while \(i_{2}\) changes.
Subtopic:  Applications of PN junction |
 65%
From NCERT
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In the given circuit, the power developed in \(2~\text{k}\Omega\) resistor is:


1. \(36~\text{mW}\)
2. \(12~\text{mW}\)
3. \(144~\text{mW}\)
4. \(72~\text{mW}\)

Subtopic:  Applications of PN junction |
 72%
From NCERT
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The LED:
1. is reverse-biased.
2. is forward-biased.
3. can be made of \(\mathrm{GaAs}\).
4. both (2) & (3) are correct.

Subtopic:  Applications of PN junction |
 70%
From NCERT
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The depletion layer in the \(\mathrm{p\text-n}\) 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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A Zener diode is shown in the following circuit diagram. When the source voltage fluctuates such that \(V>V_z\) then:
   

1. all the current \(I_1, I_2~\text{and}~I_3\) change.
2. only \(I_1\) and \(I_2\) change and \(I_3\) remains constant.
3. only \(I_1\) and \(I_3\) change and \(I_2\) remains constant.
4. all the currents remain constant.
Subtopic:  Applications of PN junction |
 69%
From NCERT
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The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance \(R_1\) 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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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. \(\mathrm{p}\text-\)type semiconductor
2. insulator
3. metal
4. \(\mathrm{n}\text-\)type semiconductor
Subtopic:  Energy Band theory |
 74%
From NCERT
AIPMT - 2007
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