For the given circuit, the input digital signals are applied at the terminals $A,B$ and $C$. What would be the output at the terminal $y$ ? ![NEET 2021 Physics, Semiconductors — question figure 1](https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/616059730283de43c87e3e22/Physics/images/Semiconductors/66bcc01dae81d148616b26b7/question_1__q_66bcc01dae81d148616b26b7__cdn-question-pool.getmarks.app__9dd43367-2f32-4918-98df-bd5844233244-image__90aef4aac1_final_ppt_sync.png) ![NEET 2021 Physics, Semiconductors — question figure 2](https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/616059730283de43c87e3e22/Physics/images/Semiconductors/66bcc01dae81d148616b26b7/question_2__q_66bcc01dae81d148616b26b7__cdn-question-pool.getmarks.app__f71ad9dc-d936-4b08-93be-1b65e8ba67d6-image__63c2ac99e3_final_ppt_sync.png)

![NEET 2021 Physics, Semiconductors — solution figure 1](https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/616059730283de43c87e3e22/Physics/images/Semiconductors/66bcc01dae81d148616b26b7/solution_1__q_66bcc01dae81d148616b26b7__cdn-question-pool.getmarks.app__12613a91-5cd4-4b9d-84b1-a1af5e662407-image__7f385e553f_final_ppt_sync.png) Truth table of AND gate for output ${y}_{1}$ $A$ $B$ ${y}_{1}$ $0$ $0$ $0$ $0$ $1$ $0$ $1$ $0$ $0$ $1$ $1$ $1$ Truth table of NAND gate for output$1$ ${y}_{2}$ $B$ $C$ ${y}_{2}$ $0$ $0$ $1$ $0$ $1$ $1$ $1$ $0$ $1$ $1$ $1$ $0$ Truth table of $\mathrm{OR}$ gate for output $y$ ${y}_{1}$ ${y}_{2}$ $y$ $0$ $0$ $0$ $0$ $1$ $1$ $1$ $0$ $1$ $1$ $1$ $1$ ![NEET 2021 Physics, Semiconductors — solution figure 2](https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/616059730283de43c87e3e22/Physics/images/Semiconductors/66bcc01dae81d148616b26b7/solution_2__q_66bcc01dae81d148616b26b7__cdn-question-pool.getmarks.app__3825b8ea-d5fc-43dd-b345-3b5eb4c1174c-image__cc3502f024_final_ppt_sync.png)

NEET UG 2021 — Physics Modern Physics

2021mcqhard

For the given circuit, the input digital signals are applied at the terminals $A,B$ and $C$ . What would be the output at the terminal $y$ ?

NEET 2021 Physics, Semiconductors — question figure 1

NEET 2021 Physics, Semiconductors — question figure 2

Official previous-year question

Held on 30 Apr 2021 · Verified 9 Jul 2026.

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Solution

NEET 2021 Physics, Semiconductors — solution figure 1

Truth table of AND gate for output ${y}_{1}$

$A$	$B$	${y}_{1}$
$0$	$0$	$0$
$0$	$1$	$0$
$1$	$0$	$0$
$1$	$1$	$1$

Truth table of NAND gate for output

1

{y}_{2}

$B$	$C$	${y}_{2}$
$0$	$0$	$1$
$0$	$1$	$1$
$1$	$0$	$1$
$1$	$1$	$0$

Truth table of

\mathrm{OR}

gate for output

y

${y}_{1}$	${y}_{2}$	$y$
$0$	$0$	$0$
$0$	$1$	$1$
$1$	$0$	$1$
$1$	$1$	$1$

![NEET 2021 Physics, Semiconductors — solution figure 2](https://prepforbharat.s3.ap-south-1.amazonaws.com/exam/616059730283de43c87e3e22/Physics/images/Semiconductors/66bcc01dae81d148616b26b7/solution_2__q_66bcc01dae81d148616b26b7__cdn-question-pool.getmarks.app__3825b8ea-d5fc-43dd-b345-3b5eb4c1174c-image__cc3502f024_final_ppt_sync.png)

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Solution

NEET 2021 Physics, Semiconductors — solution figure 1

Truth table of AND gate for output ${y}_{1}$

$A$	$B$	${y}_{1}$
$0$	$0$	$0$
$0$	$1$	$0$
$1$	$0$	$0$
$1$	$1$	$1$

Truth table of NAND gate for output

1

{y}_{2}

$B$	$C$	${y}_{2}$
$0$	$0$	$1$
$0$	$1$	$1$
$1$	$0$	$1$
$1$	$1$	$0$

Truth table of

\mathrm{OR}

gate for output

y

${y}_{1}$	${y}_{2}$	$y$
$0$	$0$	$0$
$0$	$1$	$1$
$1$	$0$	$1$
$1$	$1$	$1$

NEET UG 2021 — Physics Modern Physics

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NEET UG 2021 — Physics Modern Physics

Options

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Solution

Your note

NEET UG Modern Physics in other years

More NEET UG Modern Physics questions

Other Physics topics for NEET UG

Mechanics

Electromagnetism

Thermodynamics

Optics

Waves & Oscillations

Keep practicing Modern Physics