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JEE Physics - MCQ Practice Questions

Practice free JEE Physics multiple-choice questions with detailed answers and explanations. Perfect for competitive exam preparation.

900 questions | 100% Free

Q.21Medium

In the Einstein relation for semiconductors, the ratio of diffusion coefficient to mobility (D/μ) equals:

Q.22Medium

The temperature coefficient of resistance for semiconductors is:

Q.23Medium

In a metal-semiconductor contact, if the metal work function is greater than the semiconductor work function, a __________ barrier is formed:

Q.24Medium

In an LED, the wavelength of emitted light depends on:

Q.25Medium

The Hall coefficient for a p-type semiconductor is:

Q.26Medium

The transconductance (gm) of a MOSFET increases with:

Q.27Medium

A solar cell's efficiency is reduced by all the following EXCEPT:

Q.28Medium

The output impedance of a common-emitter amplifier is determined primarily by:

Q.29Medium

In a MOSFET, the threshold voltage VT is defined as the gate voltage at which:

Q.30Medium

In a p-n junction under reverse bias, the depletion width increases because:

Q.31Medium

What is the primary cause of temperature dependence of bandgap energy in semiconductors?

Q.32Medium

When a p-n junction is forward biased, the width of the depletion region:

Q.33Medium

The reverse saturation current (I₀) of a diode doubles approximately every:

Q.34Medium

What is the typical doping concentration for a lightly doped side of a p-n junction used in photodiodes?

Q.35Medium

When a BJT enters saturation, the relationship between collector and base current is best described as:

Q.36Medium

In a JFET, pinch-off occurs when:

Q.37Medium

The body effect in a MOSFET (substrate bias effect) occurs because:

Q.38Medium

In a metal-semiconductor (Schottky) junction, the barrier height is primarily determined by:

Q.39Medium

Compared to a p-n junction diode, a Schottky diode has:

Q.40Medium

In a p-i-n photodiode, the intrinsic region serves to:

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