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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 28 June 2022, Shift 2, Physics Q35

Question 35 of 90 in this shift, Physics question 5 of 30, Section A.

Water falls from a 40 m high dam at the rate of 9×1049\times10^4 kg per hour. Fifty percentage of gravitational potential energy can be converted into electrical energy. Using this hydro electric energy number of 100 W lamps, that can be lit, is : (Take g=10 ms−2^{-2})
  1. (1)25
  2. (2)50Official answer
  3. (3)100
  4. (4)18

Official answer

Option 2

NTA final key.

Chapter
Work, Energy and Power
Topic
Power
Idea tested
Power in Fluid Flow

Same idea in other shifts

Asked 2× in all
  1. 13 Apr 2023, Shift 1 · Q41The ratio of powers of two motors is 3xx+1\frac{3\sqrt{x}}{\sqrt{x}+1}, that are capable of raising 300 kg water in 5 minutes and 50 kg water…MediumSingle 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.