# 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: Â PN junction |
Â 83%
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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: Â Applications of PN junction |
Â 88%
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The combination of gates shown in the diagram is equivalent to:

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

Subtopic: Â Logic gates |
Â 73%
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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: Â Applications of PN junction |
Â 65%
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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: Â Applications of PN junction |
Â 73%
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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: Â Applications of PN junction |
Â 70%
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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: Â PN junction |
Â 76%
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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: Â Applications of PN junction |
Â 69%
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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: Â PN junction |
Â 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: Â Energy Band theory |
Â 74%
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AIPMT - 2007
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