JEE Main 2025 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 2 April 2025, Shift 1, Physics Q35

Question 35 of 75 in this shift, Physics question 10 of 25, Section A.

The battery of a mobile phone is rated as 4.2 V, 5800 mAh. How much energy is stored in it when fully charged ?

(1)24.4 kJ
(2)87.7 kJOfficial answer
(3)48.7 kJ
(4)43.8 kJ

Official answer

Option 2

NTA final key.

Chapter: Current Electricity
Topic: Ohm's Law and Resistance
Idea tested: Electrical Energy Consumption Units

Same topic in other shifts

All Ohm's Law and Resistance questions

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
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 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
4 Apr 2024, Shift 1 · Q41The resistances of the platinum wire of a platinum resistance thermometer at the ice point and steam point are $8\ \Omega$ and…EasySingle correct
4 Apr 2024, Shift 2 · Q42An electric bulb rated 50 $W$ - 200 $V$ is connected across a 100 $V$ supply. The power dissipation of the bulb is:EasySingle correct
4 Apr 2024, Shift 2 · Q55Two wires $A$ and $B$ are made up of the same material and have the same mass. Wire $A$ has radius of 2.0 mm and wire $B$ has radius of…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 108 of the 174 JEE Main shifts held from 2017 to 2026.