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Saturday, 31 October

JEE Main 2021 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 27 August 2021, Shift 1, Physics Q21

Question 21 of 90 in this shift, Physics question 21 of 30, Section B.

A circuit is arranged as shown in figure. The output voltage Vo\mathrm{V_o} is equal to __________ V.

The figure, in words

Circuit: two diode-symbols D1 and D2 (both drawn the same way, triangle pointing left toward the bar) connected in parallel between the left-hand wire (joined to the bottom ground rail) and a middle node. From the middle node, a resistor R leads to the base line of a three-terminal circle symbol (the lower terminal has an arrowhead pointing outward) and another resistor R goes down in series with a 5 V cell to the ground rail (ground symbol drawn there). The lower terminal of the circle symbol goes to the ground rail; its upper terminal goes up to the output point Vo\mathrm{V_o} and, through a resistor R, to a 5 V cell whose other end goes to the ground rail.

Official answer

5

NTA final key.

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
Semiconductor Diodes
Idea tested
Ideal vs. Practical Diode Circuit Analysis

Same idea in other shifts

Asked 12× in all
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  2. 8 Apr 2025, Shift 2 · Q45The output voltage in the following circuit is (Consider ideal diode case)MediumDiagram basedHas a figure
  3. 4 Apr 2024, Shift 1 · Q48The value of net resistance of the network as shown in the given figure is :MediumDiagram basedHas a figure
  4. 15 Apr 2023, Shift 1 · Q43In the given circuit, the current (I) through the battery will beMediumDiagram basedHas a figure
  5. 25 Jul 2022, Shift 2 · Q56Two ideal diodes are connected in the network as shown is figure. The equivalent resistance between A and B is _______ Ω\Omega .MediumNumerical valueHas a figure
  6. 27 Jun 2022, Shift 2 · Q60The cut-off voltage of the diodes (shown in figure) in forward bias is 0.6 V. The current through the resister of 40 Ω\Omega is ________…MediumNumerical valueHas a figure
  7. 25 Feb 2021, Shift 1 · Q7A 5 V battery is connected across the points X and Y. Assume D1D_1 and D2D_2 to be normal silicon diodes. Find the current supplied by the…MediumDiagram basedHas a figure
  8. 26 Feb 2021, Shift 1 · Q28The circuit contains two diodes each with a forward resistance of 50 Ω\Omega and with infinite reverse resistance. If the battery voltage…MediumNumerical valueHas 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.