# The given graph represents the $$V\text-I$$ characteristic for a semiconductor device. Which of the following statement is correct? 1. It is a $$V\text-I$$ characteristic for a solar cell where point $$A$$ represents open-circuit voltage and point $$B$$ represents short-circuit current. 2. It is for a solar cell and points $$A$$ and $$B$$ represent open-circuit voltage and current respectively. 3. It is for a photodiode and points $$A$$ and $$B$$ represent open-circuit voltage and current respectively. 4. It is for a LED and points $$A$$ and $$B$$ represent open-circuit voltage and short circuit current respectively.

Subtopic: Â Applications of PN junction |
Â 68%
From NCERT
NEET - 2014
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Pure $$Si$$ at $$500$$ K has equal number of electron $$(n_i)$$ and hole $$(n_h)$$ concentration of $$1.5\times10^{16}~\text{m}^{-3}.$$ Doping by indium increases $$n_h$$ to $$4.5\times 10^{22}~\text{m}^{-3}$$. The doped semiconductor is of:
 1 $$\mathrm{n}\text-$$type with electron concentration $$n_{e}=5\times10^{22}~\text{m}^{-3}$$ 2 $$\mathrm{p}\text-$$type with electron concentration $$n_{e}=2.5\times10^{23}~\text{m}^{-3}$$ 3 $$\mathrm{n}\text-$$type with electron concentration $$n_{e}=2.5\times10^{10}~\text{m}^{-3}$$ 4 $$\mathrm{p}\text-$$type with electron concentration $$n_{e}=5\times10^{9}~\text{m}^{-3}$$
Subtopic: Â Types of Semiconductors |
Â 69%
From NCERT
NEET - 2011
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The electrical circuit used to get smooth output from a rectifier circuit is called:

1. oscillator.

2. filter.

3. amplifier.

4. logic gates.

Subtopic: Â Rectifier |
Â 60%
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The correct symbol for zener diode is:

 1 2 3 4
Subtopic: Â Applications of PN junction |
Â 90%
From NCERT
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If in a $$\mathrm{p\text-n}$$ junction, a square input signal of $$10$$ V is applied as shown, then the output across $$R_L$$ will be:

 1 2 3 4
Subtopic: Â Rectifier |
Â 66%
From NCERT
NEET - 2015
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Carbon, Silicon, and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy gaps represented by $$\left(E_g\right)_C,(E_g)_{Si}~\text{and}~(E_g)_{Ge}$$ respectively. Which one of the following relationships is true in their case?

 1 $$\left(E_g\right)_C<\left(E_g\right)_{G e}$$ 2 $$\left(E_g\right)_C>\left(E_g\right)_{S i}$$ 3 $$\left(E_g\right)_C=\left(E_g\right)_{S i}$$ 4 $$\left(E_g\right)_C<\left(E_g\right)_{S i}$$
Subtopic: Â Energy Band theory |
Â 70%
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A semiconductor is known to have an electron concentration of $$8\times 10^{13}~\text{cm}^{-3}$$ and a hole concentration of $$5\times 10^{2}~\text{cm}^{-3}$$. The semiconductor is:
1. $$\mathrm{n}\text-$$type
2. $$\mathrm{p}\text-$$type
3. intrinsic
4. insulator

Subtopic: Â Types of Semiconductors |
Â 87%
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$${C}$$ and $${Si}$$ both have the same lattice structure, having $$4$$ bonding electrons in each. However, $$C$$ is an insulator whereas $$Si$$ is an intrinsic semiconductor. This is because:
 1 in the case of $$C$$, the valence band is not completely filled at absolute zero temperature. 2 in the case of $$C$$, the conduction 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.
Subtopic: Â Energy Band theory |
Â 71%
From NCERT
NEET - 2012
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The figure shows a logic circuit with two inputs $$A$$ and $$B$$ and the output $$C$$. The voltage waveforms across $$A$$, $$B$$, and $$C$$ are as given. The logic circuit gate is:

1. $$\text{OR}$$ gate
2. $$\text{NOR}$$ gate
3. $$\text{AND}$$ gate
4. $$\text{NAND}$$ gate

Subtopic: Â Logic gates |
Â 83%
From NCERT
AIPMT - 2012
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$$\mathrm{p\text-n}$$ photodiode is fabricated from a semiconductor with a band gap of $$2.5$$ eV. It can detect a signal of wavelength:
1. $$6000~\mathring{A}$$
2. $$4000$$ nm
3. $$6000$$ nm
4. $$4000~\mathring{A}$$
Subtopic: Â Energy Band theory |
Â 63%
From NCERT
AIPMT - 2009
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