1
KCET 2021
MCQ (Single Correct Answer)
+1
-0

The circuit given represents which of the logic operations?

KCET 2021 Physics - Semiconductor Devices and Logic Gates Question 1 English

A
OR
B
AND
C
NOT
D
NOR
2
KCET 2021
MCQ (Single Correct Answer)
+1
-0

Identify the incorrect statement.

A
When a $$p$$-$$n$$ junction diode is forward biased, then the width of the depletion region decreases.
B
When a $$p$$-$$n$$ junction diode is reverse biased, the barrier potential increases.
C
A photodiode is operated in the reverse bias.
D
An LED is a lightly doped $$p$$-$$n$$ junction diode which emits spontaneous radiation of forward biasing.
3
KCET 2021
MCQ (Single Correct Answer)
+1
-0

Three photodiodes $$D_1, D_2$$ and $$D_3$$ are made of semiconductors having band gaps of $$2.5 \mathrm{~eV}, 2 \mathrm{~eV}$$ and $$3 \mathrm{~eV}$$, respectively. Which one will be able to detect light of wavelength $$600 \mathrm{~nm}$$ ?

A
$$D_1$$ only
B
Both $$D_1$$ and $$D_3$$
C
$$D_2$$ only
D
All of these
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