Learn

Friday, 9 October

JEE Main 2024 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 31 January 2024, Shift 1, Physics Q41

Question 41 of 90 in this shift, Physics question 11 of 30, Section A.

Two conductors have the same resistances at 0∘0^\circC but their temperature coefficients of resistance are α1\alpha_1 and α2\alpha_2. The respective temperature coefficients for their series and parallel combinations are :
  1. (1)α1+α22, α1+α22\frac{\alpha_1+\alpha_2}{2},\ \frac{\alpha_1+\alpha_2}{2}Official answer
  2. (2)α1+α22, α1+α2\frac{\alpha_1+\alpha_2}{2},\ \alpha_1+\alpha_2
  3. (3)α1+α2, α1+α22\alpha_1+\alpha_2,\ \frac{\alpha_1+\alpha_2}{2}
  4. (4)α1+α2, α1α2α1+α2\alpha_1+\alpha_2,\ \frac{\alpha_1\alpha_2}{\alpha_1+\alpha_2}

Official answer

Option 1

NTA final key.

Chapter
Current Electricity
Topic
Ohm's Law and Resistance
Idea tested
Equivalent Temperature Coefficient in Series

Same topic in other shifts

All Ohm's Law and Resistance questions
  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

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. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.