COMEDK 2025 Afternoon Shift | Semiconductor Devices and Logic Gates Question 1 | Physics

Three ideal diodes and resistors connected to the cell of negligible internal resistance is as shown. Find the current passing through the $10 \Omega$ resistor.

1 A

2 A

0.5 A

0.1 A

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

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Diamond is considered as an insulator because

Diamond has very large forbidden energy gap.

Valance band and conduction band of diamond are overlapping X .

In the diamond the carbon atoms are held by weak covalent bonds

Refractive index of diamond is very low

COMEDK 2025 Afternoon Shift

MCQ (Single Correct Answer)

-0

What is the maximum wave length of EM radiation required to move an electron from the valance band to conduction band of a semiconductor? [Given :Energy gap $\mathrm{E}_{\mathrm{g}}=1.98 \times 10^{-19} \mathrm{~J}$; Planck's constant $h=6.6 \times 10^{-34} \mathrm{Js}$ ]

$10^{-9} \mathrm{~m}$

$10^{-6} \mathrm{~m}$

$10^{-10} \mathrm{~m}$

$10^{-12} \mathrm{~m}$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

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A Si and a Ge diode has identical physical dimensions. The band gap in Si is larger than that in Ge. On applying identical reverse bias across these diodes,

The reverse current in Ge is lesser than that in Si .

The relative magnitudes of reverse currents cannot be determined from the given data.

The reverse current is identical in both cases.

The reverse current in Ge is larger than that in Si .

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