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JEE Main 2017 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 2 April 2017 (offline), Physics Q10

Question 10 of 90 in this shift, Physics question 10 of 30.

C_p

and

C_v

are specific heats at constant pressure and constant volume respectively. It is observed that

C_p - C_v = a

for hydrogen gas

C_p - C_v = b

for nitrogen gas The correct relation between a and b is :

(1) $a=\frac{1}{14}b$
(2) $a=b$
(3) $a=14\,b$ Official answer
(4) $a=28\,b$

Official answer

Option 3

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

Chapter: Thermodynamics
Topic: First Law of Thermodynamics
Idea tested: Mayer's Relation (Cp and Cv)

Same idea in other shifts

Asked 2× in all

2 Apr 2026, Shift 2 · Q485 moles of unknown gas is heated at constant volume from 10°C to 20°C. The molar specific heat of this gas at constant pressure $c_p = 8$ …MediumNumerical value

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.