NEET Electronic Devices — Set 1

Question 1

The reverse saturation current in a diode is:

Accepted Answer

The reverse saturation current is nearly constant with voltage (until breakdown), determined by the minority carrier concentration, not the applied reverse voltage magnitude.

Question 2

In a p-type semiconductor, the number of holes is related to electrons by:

Accepted Answer

In a p-type semiconductor, trivalent doping increases holes (majority carriers) significantly over electrons (minority carriers), so $ n_h \gg n_e $, with $ n_e n_h = n_i^2 $.

Question 3

The purpose of a capacitor in a rectifier circuit is to:

Accepted Answer

A capacitor in a rectifier circuit filters out AC ripples by charging to the peak voltage and discharging slowly, smoothing the pulsating output to provide a steadier DC voltage.

NEET Physics: Electronic Devices — Practice Set 1

Q1. The reverse saturation current in a diode is:

Q2. In a p-type semiconductor, the number of holes is related to electrons by:

Q3. The purpose of a capacitor in a rectifier circuit is to:

Q4. In an extrinsic semiconductor, the overall charge neutrality is maintained because:

Q5. In a p-n junction under equilibrium, the net current is:

Q6. The number of outer electrons in a Si crystal with \( N \) atoms is:

Q7. Which of the following is an example of a compound semiconductor?

Q8. The electric field in the depletion region of a p-n junction is directed from:

Q9. The minority carrier injection in a forward-biased diode refers to:

Q10. The electrical conductivity of a semiconductor is: