Heat & Thermodynamics · JEE Main previous year questions

2016 3 questions

1. Q372016 · 3 Apr 2016 · Shift 1

   An ideal gas undergoes a quasi static, reversible process in which its molar heat capacity $C$ remains constant. If during this process the relation of pressure $P$ and volume $V$ is given by $P{V}^n=\text{constant}$, then $n$ is given by (Here $C_p$ and $C_v$ are molar specific heat at constant pressure and constant volume, respectively:

   1. A.$n=\frac{C_p-C}{C-C_v}$
   2. B.$n=\frac{C-C_v}{C-C_p}$
   3. C.$n=\frac{C_p}{C_v}$
   4. D.$n=\frac{C-C_p}{C-C_v}$
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   Answer: D

2. Q512016 · 3 Apr 2016 · Shift 1

   Radiation of wavelength $\lambda$, is incident on a photocell. The fastest emitted electron has speed $v$. If the wavelength is changed to $\frac{3\lambda }{4}$, the speed of the fastest emitted electron will be:

   1. A.$=v{\left(\frac{4}{3}\right)}^{\frac{1}{2}}$
   2. B.$=v{\left(\frac{3}{4}\right)}^{\frac{1}{2}}$
   3. C.$>v{\left(\frac{4}{3}\right)}^{\frac{1}{2}}$
   4. D.$<v{\left(\frac{4}{3}\right)}^{\frac{1}{2}}$
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   Answer: C

3. Q562016 · 3 Apr 2016 · Shift 1

   Arrange the following electromagnetic radiations per quantum in the order of increasing energy : A : Blue light           B : Yellow light C : X-ray                 D : Radiowave.

   1. A.C, A, B, D
   2. B.B, A, D, C
   3. C.D, B, A, C
   4. D.A, B, D, C
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   Answer: C