KCET 2021 | Semiconductor Devices and Logic Gates Question 15 | Physics

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 $$600 \mathrm{~nm}$$ ?

$$D_1$$ only

Both $$D_1$$ and $$D_3$$

$$D_2$$ only

All of these

KCET 2020

MCQ (Single Correct Answer)

-0

In the following circuit what are P and Q

KCET 2020 Physics - Semiconductor Devices and Logic Gates Question 19 English

$$P=1, Q=0$$

$$P=0, Q=1$$

$$P=0, Q=0$$

$$P=1, Q=1$$

KCET 2020

MCQ (Single Correct Answer)

-0

A positive hole in a semiconductor is

an anti-particle of electron

a vacancy created when an electron leaves a covalent bond

absence of free electrons

an artificially created particle

KCET 2019

MCQ (Single Correct Answer)

-0

The conductivity of semiconductor increases with increase in temperature because

number density of charge carriers increases

relaxation time increases

both number density of charge carriers and relaxation time increases

number density of current carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density

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