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Saturday, 31 October

JEE Main 2024 · PhysicsMultiple choiceDiagram basedMediumApplication

JEE Main 5 April 2024, Shift 1, Physics Q49

Question 49 of 90 in this shift, Physics question 19 of 30, Section A.

Following gates section is connected in a complete suitable circuit. For which of the following combination, bulb will glow (ON) :

The figure, in words

Logic circuit: input A goes to a NOR gate (both inputs tied to A); inputs B and C go to a NAND gate; the outputs of these two gates feed a second NOR gate. Its output goes through a resistor R to one terminal of a DC bulb. Input D goes to a NOR gate (both inputs tied to D) whose output connects to the other terminal of the DC bulb.
  1. (1)A=1,B=1,C=1,D=0A=1, B=1, C=1, D=0
  2. (2)A=0,B=1,C=1,D=1A=0, B=1, C=1, D=1
  3. (3)A=1,B=0,C=0,D=0A=1, B=0, C=0, D=0Official answer
  4. (4)A=0,B=0,C=0,D=1A=0, B=0, C=0, D=1

Official answer

Option 3

.

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.