Semiconductor Electronics: Materials, Devices and Simple Circuits — Practice Quiz
Madhya Pradesh Board · Class 12 · Physics
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Quick Quiz: Semiconductor Electronics: Materials, Devices and Simple Circuits
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Which of the following materials has resistivity in the range of 10^-5 to 10^6 Ω m?
How many valence electrons do Silicon (Si) and Germanium (Ge) have?
In an intrinsic semiconductor at thermal equilibrium, which relationship is correct?
What is the energy gap (Eg) for Silicon approximately?
Sample Questions
Which impurities are used to create n-type semiconductors?
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Phosphorus (P), Arsenic (As), Antimony (Sb)
N-type semiconductors are created by doping with pentavalent (5 valence electrons) impurities like P, As, and Sb. These donate extra electrons. Trivalent elements like B, Al, In create p-type semiconductors.
In p-type semiconductors, which are the majority and minority carriers?
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Majority: holes, Minority: electrons
In p-type semiconductors, doping with trivalent impurities creates more holes than electrons. Holes become majority carriers while electrons are minority carriers (nh >> ne).
What happens when a p-n junction is formed?
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Electrons diffuse from n to p region, Holes diffuse from p to n region, A depletion region is formed, An electric field develops across the junction
At p-n junction formation, diffusion creates a depletion region with fixed charges, establishing an electric field. At equilibrium, diffusion and drift currents balance, so no net current flows.
The threshold voltage for a Silicon diode is approximately:
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0.7 V
Silicon diodes have a threshold voltage of approximately 0.7 V in forward bias. Germanium diodes have a lower threshold of about 0.2 V. This is the minimum voltage needed for significant current flow.
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