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Friday, 9 October

JEE Main 2017 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 2 April 2017 (offline), Physics Q11

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

The temperature of an open room of volume 30 m330\ \mathrm{m^3} increases from 17∘17^\circC to 27∘27^\circC due to the sunshine. The atmospheric pressure in the room remains 1×1051\times10^5 Pa. If nin_i and nfn_f are the number of molecules in the room before and after heating, then nf−nin_f - n_i will be :
  1. (1)−1.61×1023-1.61\times10^{23}
  2. (2)1.38×10231.38\times10^{23}
  3. (3)2.5×10252.5\times10^{25}
  4. (4)−2.5×1025-2.5\times10^{25}Official answer

Official answer

Option 4

CBSE answer key (25/04/2017, used for result).

Chapter
Kinetic Theory
Topic
Kinetic Theory of Gases
Idea tested
Number Density Calculations

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Question text from the official JEE Main paper published by NTA (CBSE ran the 2017 exam); 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.