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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceDiagram basedEasyDiagram reading

JEE Main 31 August 2021, Shift 2, Physics Q16

Question 16 of 90 in this shift, Physics question 16 of 30, Section A.

If VAV_A and VBV_B are the input voltages (either 5 V or 0 V) and VoV_o is the output voltage then the two gates represented in the following circuits (A) and (B) are :

The figure, in words

Circuit (A): inputs V_A and V_B each go through a diode (D1 and D2 respectively) to a common junction; from the junction the output V_o is taken, and a resistor R = 1 kΩ connects the junction to ground. Circuit (B): V = 5 V at top connected through R_C = 1 kΩ to the collector of an npn transistor (labelled npn, β = 150); output V_o taken at the collector; input V_B goes through R_B = 100 kΩ to the base; emitter to ground.
  1. (1)NAND and NOR Gate
  2. (2)AND and OR Gate
  3. (3)AND and NOT Gate
  4. (4)OR and NOT GateOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
Logic Gates
Idea tested
Diode Realization of OR and AND Gates

Same idea in other shifts

Asked 2× in all
  1. 25 Jul 2022, Shift 1 · Q50In the circuit, the logical value of A=1A=1 or B=1B=1 when potential at A or B is 55 V and the logical value of A=0A=0 or B=0B=0 when…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.