Learn

Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceDiagram basedMediumDiagram reading

JEE Main 2 September 2020, Shift 2, Physics Q19

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

In the following digital circuit, what will be the output at ‘Z’, when the input (A, B) are (1, 0), (0, 0), (1, 1), (0, 1) :

The figure, in words

Logic circuit with input terminals A (top left) and B (bottom left), each a dot, and output terminal Z (right, a dot). Four gate symbols are drawn: a top gate with a flat back, rounded front and a small circle at its output; a lower gate with a curved back and pointed front (two inputs on the curved back); a middle gate with a flat back and rounded front (no circle); and a right-hand gate with a curved back, pointed front and a small circle at its output, whose output goes to Z. Wiring: A goes right to one input of the top gate, and a branch from A runs down and then right (with a small arc hopping over a vertical line) to one input of the lower curved-back gate. B runs right into the other input of the lower gate and a vertical line from the B line goes up to the second input of the top gate. The top gate output goes right to one input of the right-hand gate and a branch from it goes down to one input of the middle gate. The lower gate output goes right then up to the other input of the middle gate. The middle gate output goes up to the second input of the right-hand gate.
  1. (1)1, 0, 1, 1
  2. (2)0, 1, 0, 0
  3. (3)0, 0, 1, 0Official answer
  4. (4)1, 1, 0, 1

Official answer

Option 3

NTA final key (Sep 2020).

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

Same idea in other shifts

Asked 31× 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 108 of the 174 JEE Main shifts held from 2017 to 2026.