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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceDiagram basedEasyDiagram reading

JEE Main 4 August 2021, Shift 1, Physics Q6

Question 6 of 90 in this shift, Physics question 6 of 30, Section A.

Which logic gate will be realised by the following circuit ?

The figure, in words

Circuit: supply terminal +V_CC at top connected through a resistor to the collector of transistor T1; output terminal y is taken from the junction between that resistor and T1's collector. T1's emitter is connected to the collector of transistor T2; T2's emitter goes to ground. Input A is connected through a resistor to the base of T1; input B is connected through a resistor to the base of T2.
  1. (1)AND
  2. (2)NANDOfficial answer
  3. (3)NOR
  4. (4)OR

Official answer

Option 2

NTA final key.

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
Logic Gates
Idea tested
Transistor Realization of NAND Gate

Same topic in other shifts

All Logic Gates questions
  1. 2 Apr 2026, Shift 2 · Q30If X and Y are the inputs, the given circuit works asMediumDiagram basedHas a figure
  2. 4 Apr 2026, Shift 1 · Q38Two 44 bits binary numbers, A=1101A=1101 and B=1010B=1010 are given in the inputs of a logic circuit shown in figure below. The output (YY) will…EasyDiagram basedHas a figure
  3. 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
  4. 6 Apr 2026, Shift 2 · Q43Refer to the logic circuit given below. For two inputs (A=1A=1, B=1B=1) and (A=0A=0, B=1B=1), output (YY) will be __________.EasyDiagram basedHas a figure
  5. 8 Apr 2026, Shift 2 · Q45The output YY for the given inputs AA and BB to the circuit is :MediumDiagram basedHas a figure
  6. 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

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 108 of the 174 JEE Main shifts held from 2017 to 2026.