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Saturday, 31 October

JEE Main 2024 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 30 January 2024, Shift 1, Physics Q41

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

An electric toaster has resistance of 60 Ω\Omega at room temperature (27 ∘C27\,^\circ\mathrm{C}). The toaster is connected to a 220 V supply. If the current flowing through it reaches 2.75 A, the temperature attained by toaster is around : ( if α=2×10−4/∘C\alpha = 2\times10^{-4}/^\circ\mathrm{C})
  1. (1)694 ∘C694\,^\circ\mathrm{C}
  2. (2)1667 ∘C1667\,^\circ\mathrm{C}
  3. (3)1694 ∘C1694\,^\circ\mathrm{C}Official answer
  4. (4)1235 ∘C1235\,^\circ\mathrm{C}

Official answer

Option 3

NTA final key.

Chapter
Current Electricity
Topic
Ohm's Law and Resistance
Idea tested
Temperature Coefficient of Resistance

Same idea in other shifts

Asked 7× in all
  1. 4 Apr 2024, Shift 1 · Q41The resistances of the platinum wire of a platinum resistance thermometer at the ice point and steam point are 8 Ω8\ \Omega and…EasySingle correct
  2. 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
  3. 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
  4. 12 Apr 2023, Shift 1 · Q57The current flowing through a conductor connected across a source is 2 A and 1.2 A at 0∘0^\circC and 100∘100^\circC respectively. The…MediumNumerical value
  5. 15 Apr 2023, Shift 1 · Q50Given below are two statements: Statement I : The equivalent resistance of resistors in a series combination is smaller than least…EasyTwo statements
  6. 28 Jun 2022, Shift 2 · Q41Resistance of the wire is measured as 2 Ω and 3 Ω at 10°C and 30°C respectively. Temperature co-efficient of resistance of the material of…EasySingle correct

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 108 of the 174 JEE Main shifts held from 2017 to 2026.