MHT CET 2021 21th September Morning Shift | Semiconductor Devices and Logic Gates Question 122 | Physics

In a pure silicon, number of electrons and holes per unit volume are $$1.6 \times 10^{16} \mathrm{~m}^{-3}$$. If silicon is doped with Boron in a way that on doping hole density increases to $$4 \times 10^{22} \mathrm{~m}^{-3}$$. Then electron density in doped semiconductor will be

$$6.4 \times 10^{-9} \mathrm{~m}^{-3}$$

$$6.4 \times 10^9 \mathrm{~m}^{-3}$$

$$6.4 \times 10^{-10} \mathrm{~m}^{-3}$$

$$6.4 \times 10^{10} \mathrm{~m}^{-3}$$

MHT CET 2021 21th September Morning Shift

MCQ (Single Correct Answer)

-0

For a transitor, $$\frac{1}{\alpha_{\mathrm{DC}}}-\frac{1}{\beta_{\mathrm{DC}}}$$ is equal to [ $$\alpha_{\mathrm{DC}}$$ and $$\beta_{\mathrm{DC}}$$ are current amplification factors]

three

two

zero

one

MHT CET 2021 21th September Morning Shift

MCQ (Single Correct Answer)

-0

The current in the following circuit is

MHT CET 2021 21th September Morning Shift Physics - Semiconductor Devices and Logic Gates Question 132 English

10 A

zero

0.025 A

10$$^{-2}$$ A

MHT CET 2021 20th September Evening Shift

MCQ (Single Correct Answer)

-0

The output of an 'OR' gate is 'one'

only when both inputs are 'one'.

only when both inputs are 'zero'.

only when either input is 'zero'.

if either or both inputs are 'one'.

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