JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumRecall

JEE Main 2 September 2020, Shift 1, Physics Q12

Question 12 of 75 in this shift, Physics question 12 of 25.

Consider four conducting materials copper, tungsten, mercury and aluminium with resistivity

\rho_C

\rho_T

\rho_M

and

\rho_A

respectively. Then :

(1) $\rho_C>\rho_A>\rho_T$
(2) $\rho_A>\rho_T>\rho_C$
(3) $\rho_A>\rho_M>\rho_C$
(4) $\rho_M>\rho_A>\rho_C$ Official answer

Official answer

Option 4

NTA final key (Sep 2020).

Chapter: Current Electricity
Topic: Ohm's Law and Resistance
Idea tested: Resistivity and Geometry

Same idea in other shifts

Asked 3× in all

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
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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.