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Which of the following is incorrect for semiconductors?

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Important Questions on Semiconductor Electronics: Materials, Devices and Simple Circuits

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The transistors provide good power amplification when they are used in
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In a semiconductor, the concentration of electrons is 8×1014 per cm3 and that of the holes is 5×1012 per cm3. The semiconductor is _____.
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Which of the following statements is not true for Zener diode?

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Diffusion current in a p–n junction is greater than the drift current in magnitude
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For the diodes given in figures below, the forward biased diode is
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The circuit diagram shown here corresponds to the logic gate,

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