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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceDiagram basedMediumData or graph

JEE Main 31 August 2021, Shift 1, Physics Q1

Question 1 of 90 in this shift, Physics question 1 of 30, Section A.

Choose the correct waveform that can represent the voltage across R of the following circuit, assuming the diode is ideal one :

The figure, in words

Circuit: an ac source labelled V_i = 10 sin(omega t) in series with a diode D and a resistor R and a battery of 3 V (the + sign marked at the upper plate of the battery, towards R, and - at the lower plate), forming a single loop.
  1. (1)[figure: graph of V vs t with dashed levels at +3 and -3; a solid half-sine hump above the t axis starting at the origin, then the negative half-cycle drawn dashed, then a solid hump again]
  2. (2)[figure: graph of V vs t with dashed levels at +3 and -3; solid sine curve starting at the +3 level, rising to a peak and coming back down to the +3 level, then the rest drawn dashed below, and the solid curve resumes at the +3 level]Official answer
  3. (3)[figure: graph of V vs t with dashed levels at +3 and -3; solid sine curve from the origin up to a peak and down to the -3 level, then a solid horizontal line at -3, then the solid curve rises again; the part of the sine below -3 is drawn dashed]
  4. (4)[figure: graph of V vs t with dashed levels at +3 and -3; the positive part of the sine above +3 is dashed, a solid horizontal line at +3, and the solid sine curve through the negative half-cycle]

Official answer

Option 2

NTA final key.

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
Semiconductor Diodes
Idea tested
Diode Clipper Circuits

Same idea in other shifts

Asked 3× in all
  1. 2 Apr 2026, Shift 1 · Q37For the given circuit (shown in part (A)) the time dependent input voltage vin(t)v_{in}(t) and corresponding output vo(t)v_o(t) are shown in part…MediumDiagram basedHas a figure
  2. 28 Jun 2022, Shift 2 · Q49In the given circuit the input voltage VinV_{in} is shown in figure. The cut-in voltage of p-n junction diode (D1D_1 or D2D_2) is 0.6 V.…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.