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Saturday, 10 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 8 January 2020, Shift 1, Physics Q19

Question 19 of 75 in this shift, Physics question 19 of 25, Section A.

Boolean relation at the output stage-Y for the following circuit is :

The figure, in words

Two switches A and B, each in series with a diode, connected in parallel from a 5 V supply (grounded) to a common node; that node connects to a resistor to ground and to the base of a transistor whose collector is connected to +5 V; Output-Y is taken at the transistor output.
  1. (1)A+BA+B
  2. (2)A⋅BA\cdot B
  3. (3)A‾+B‾\overline{A}+\overline{B}
  4. (4)A‾⋅B‾\overline{A}\cdot\overline{B}Official answer

Official answer

Option 4

NTA final key (Jan 2020).

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
  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. 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
  6. 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
  7. 3 Apr 2025, Shift 2 · Q45The truth table corresponding to the circuit given below is :EasyDiagram basedHas a figure
  8. 7 Apr 2025, Shift 2 · Q45Consider the following logic circuit. The output is Y=0Y=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.