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Saturday, 31 October

JEE Main 2024 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 1 February 2024, Shift 1, Physics Q48

Question 48 of 90 in this shift, Physics question 18 of 30, Section A.

In the given circuit if the power rating of Zener diode is 10 mW, the value of series resistance RsR_s to regulate the input unregulated supply is :

The figure, in words

Zener voltage regulator: input supply V_s = 8 V (+ terminal at top) feeds series resistor R_s; Zener diode with V_z = 5 V in parallel with load R_L = 1 k-ohm across the output.
  1. (1)10 kΩ\Omega
  2. (2)1 kΩ\OmegaOfficial answer
  3. (3)10 Ω\Omega
  4. (4)5 kΩ\Omega

Official answer

Option 2

NTA final key.

Chapter
Semiconductor Electronics: Materials, Devices and Simple Circuits
Topic
Semiconductor Diodes
Idea tested
Zener Diode Power Dissipation Limits

Same idea in other shifts

Asked 5× in all
  1. 4 Apr 2026, Shift 2 · Q46A diode has Zener voltage of 10 V and maximum power dissipation of 0.5 W, then the minimum resistance to be used in series with this diode…MediumNumerical value
  2. 10 Apr 2023, Shift 1 · Q43A zener diode of power rating 1.6 W is to be used as voltage regulator. If the zener diode has a breakdown of 8 V and it has to regulate…MediumDiagram basedHas a figure
  3. 30 Jun 2022, Shift 1 · Q60The circuit diagram used to study the characteristic curve of a zener diode is connected to variable power supply (0−15 V) as shown in…MediumNumerical valueHas a figure
  4. 27 Aug 2021, Shift 2 · Q30A zener diode of power rating 2 W is to be used as a voltage regulator. If the zener diode has a breakdown of 10 V and it has to regulate…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.