JEE Main 2021 · PhysicsMultiple choiceDiagram basedEasyDiagram reading

JEE Main 25 July 2021, Shift 1, Physics Q12

Question 12 of 90 in this shift, Physics question 12 of 30, Section A.

Identify the logic operation carried out.

The figure, in words

Logic circuit: inputs A and B each go into a NAND gate (AND gate with output bubble); the two NAND outputs feed a NOR gate (OR gate with output bubble) giving output Y.

(1)ANDOfficial answer
(2)NAND
(3)NOR
(4)OR

Official answer

Option 1

NTA final key.

Chapter: Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic: Logic Gates
Idea tested: Combinational Logic Circuits

Same idea in other shifts

Asked 16× in all

2 Apr 2026, Shift 2 · Q30If X and Y are the inputs, the given circuit works asMediumDiagram basedHas a figure
4 Apr 2026, Shift 1 · Q38Two $4$ bits binary numbers, $A=1101$ and $B=1010$ are given in the inputs of a logic circuit shown in figure below. The output ( $Y$ ) will…EasyDiagram basedHas a figure
5 Apr 2026, Shift 1 · Q45For the given logic circuit, which of the following inputs combination will make both LED-1 and LED-2 to glow?EasyDiagram basedHas a figure
6 Apr 2026, Shift 2 · Q43Refer to the logic circuit given below. For two inputs ( $A=1$ , $B=1$ ) and ( $A=0$ , $B=1$ ), output ( $Y$ ) will be __________.EasyDiagram basedHas a figure
2 Apr 2025, Shift 2 · Q39In the digital circuit shown in the figure, for the given inputs the P and Q values are :MediumDiagram basedHas a figure
3 Apr 2025, Shift 1 · Q45Choose the correct logic circuit for the given truth table having inputs A and B. Inputs A, B / Output Y: A=0,B=0: Y=0 A=0,B=1: Y=0…MediumDiagram basedHas a figure
3 Apr 2025, Shift 2 · Q45The truth table corresponding to the circuit given below is :EasyDiagram basedHas a figure
7 Apr 2025, Shift 2 · Q45Consider the following logic circuit. The output is $Y=0$ when :EasyDiagram basedHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.