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Friday, 9 October

JEE Main Physics · Current Electricity

Ohm's Law and Resistance in JEE Main

Ohm's Law and Resistance (Physics, Current Electricity) came 25 times in 20 of the 42 JEE Main shifts Lumi analysed, across 13 distinct ideas. 12 of them came in 2024–26; it was last asked in 2026.

Questions
25
in 20 shifts
Ideas asked
13
6 asked more than once
Numerical answer
10
40% of its questions
Pattern
Asked most years
last asked 2026
Questions each year
0480’171’203’214’225’238’243’251’26

In the shifts Lumi analysed for each year.

Difficulty and format
Easy 19Medium 6Hard 0

Format

  • Single correct14 Q
  • Numerical value10 Q
  • Diagram based1 Q
Ideas inside the topic
13 ideas
Where it sits

Part of Current Electricity, which had 65 questions in all. Ohm's Law and Resistance accounts for 38% of them. In Lumi's JEE taxonomy it belongs to Current Electricity.

Some questions sit in other chapters too: Semiconductor Electronics: Materials, Devices and Simple Circuits, Units and Measurements.

Every question

All 25 Ohm's Law and Resistance questions

Newest first, each with its options and official answer.

  1. 5 Apr 2026, Shift 2 · Q27In an experiment to determine the resistance of a given wire using Ohm's law, the voltmeter and ammeter readings are noted as 10 V and 5…EasySingle correct
  2. 2 Apr 2025, Shift 1 · Q35The battery of a mobile phone is rated as 4.2 V, 5800 mAh. How much energy is stored in it when fully charged ?EasySingle correct
  3. 3 Apr 2025, Shift 2 · Q39A motor operating on 100 V draws a current of 1 A. If the efficiency of the motor is 91.6%, then the loss of power in units of cal/s isEasySingle correct
  4. 4 Apr 2025, Shift 2 · Q36There are 'n' number of identical electric bulbs, each is designed to draw a power p independently from the mains supply. They are now…EasySingle correct
  5. 6 Apr 2024, Shift 2 · Q43The number of electrons flowing per second in the filament of a 110 W bulb operating at 220 V is : (Given e=1.6×10−19 Ce=1.6\times10^{-19}\ \mathrm{C})EasySingle correct
  6. 8 Apr 2024, Shift 1 · Q56Resistance of a wire at 0 ∘0\,^\circC, 100 ∘100\,^\circC and t ∘t\,^\circC is found to be 10 Ω10\ \Omega, 10.2 Ω10.2\ \Omega and 10.95 Ω10.95\ \Omega…MediumNumerical value
  7. 9 Apr 2024, Shift 2 · Q55At room temperature (27∘27^\circC), the resistance of a heating element is 50 Ω50\ \Omega. The temperature coefficient of the material is…EasyNumerical value
  8. 9 Apr 2024, Shift 2 · Q60To determine the resistance (RR) of a wire, a circuit is designed below. The VV-II characteristic curve for this circuit is plotted for…MediumNumerical valueHas a figure
  9. 29 Jan 2024, Shift 1 · Q31The resistance R=VIR=\frac{V}{I} where V=(200±5)V=(200\pm5) V and I=(20±0.2)I=(20\pm0.2) A, the percentage error in the measurement of R is :EasySingle correct
  10. 30 Jan 2024, Shift 2 · Q41When a potential difference VV is applied across a wire of resistance RR, it dissipates energy at a rate WW. If the wire is cut into…EasySingle correct
  11. 31 Jan 2024, Shift 1 · Q41Two conductors have the same resistances at 0∘0^\circC but their temperature coefficients of resistance are α1\alpha_1 and α2\alpha_2. The…MediumSingle correct
  12. 31 Jan 2024, Shift 2 · Q41By what percentage will the illumination of the lamp decrease if the current drops by 20%?EasySingle correct
  13. 6 Apr 2023, Shift 1 · Q41The resistivity (ρ\rho) of semiconductor varies with temperature. Which of the following curve represents the correct behaviourEasyDiagram basedHas a figure
  14. 6 Apr 2023, Shift 1 · Q46Two resistances are given as R1=(10±0.5) ΩR_1=(10\pm0.5)\,\Omega and R2=(15±0.5) ΩR_2=(15\pm0.5)\,\Omega. The percentage error in the measurement of equivalent…MediumSingle correct
  15. 6 Apr 2023, Shift 1 · Q55The length of a metallic wire is increased by 20% and its area of cross section is reduced by 4%. The percentage change in resistance of…EasyNumerical value
  16. 8 Apr 2023, Shift 2 · Q60The number density of free electrons in copper is nearly 8×10288 \times 10^{28} m−3^{-3}. A copper wire has its area of cross section =…EasyNumerical value
  17. 11 Apr 2023, Shift 1 · Q40Two identical heater filaments are connected first in parallel and then in series. At the same applied voltage, the ratio of heat produced…EasySingle correct
  18. 25 Jul 2022, Shift 1 · Q58Eight copper wire of length ll and diameter dd are joined in parallel to form a single composite conductor of resistance RR. If a…EasyNumerical value
  19. 28 Jul 2022, Shift 1 · Q41A wire of resistance R1R_1 is drawn out so that its length is increased by twice of its original length. The ratio of new resistance to…EasySingle correct
  20. 29 Jun 2022, Shift 1 · Q51Two coils require 20 minutes and 60 minutes respectively to produce same amount of heat energy when connected separately to the same…EasyNumerical value
  21. 29 Jun 2022, Shift 1 · Q55The variation of applied potential and current flowing through a given wire is shown in figure. The length of wire is 31.4 cm. The…MediumNumerical valueHas a figure
  22. 25 Jul 2021, Shift 1 · Q27An electric bulb rated as 200 W at 100 V is used in a circuit having 200 V supply. The resistance 'R' that must be put in series with the…EasyNumerical value
  23. 16 Mar 2021, Shift 2 · Q18A resistor develops 500 J of thermal energy in 20 s when a current of 1.5A is passed through it. If the current is increased from 1.5 A to…EasySingle correct
  24. 16 Mar 2021, Shift 2 · Q28The energy dissipated by a resistor is 10 mJ in 1 s when an electric current of 2 mA flows through it. The resistance is ________Ω\Omega.…EasyNumerical value
  25. 2 Sep 2020, Shift 1 · Q12Consider four conducting materials copper, tungsten, mercury and aluminium with resistivity ρC\rho_C, ρT\rho_T, ρM\rho_M and ρA\rho_A…MediumSingle correct