Heat & Thermodynamics · JEE Main previous year questions

2017 3 questions

1. Q362017 · 8 Apr 2017 · Shift 1

   In an experiment, a sphere of aluminium of mass 0.20 kg is heated upto $150^{\circ }\mathrm{C}$. Immediately, it is put into water of volume 150 cc at $27^{\circ }\mathrm{C}$ kept in a calorimeter of water equivalent to 0.025 kg. Final temperature of the system is $40^{\circ }\mathrm{C}$. The specific heat of aluminium is : (take 4.2 Joule = 1 calorie)

   1. A.$378J/kg-{}^{\circ }\mathrm{C}$
   2. B.$315J/kg-{}^{\circ }\mathrm{C}$
   3. C.$476J/kg-{}^{\circ }\mathrm{C}$
   4. D.$434J/kg-{}^{\circ }\mathrm{C}$
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   Answer: D

2. Q382017 · 8 Apr 2017 · Shift 1

   An ideal gas has molecules with 5 degrees of freedom. The ratio of specific heats at constant pressure (${\mathrm{C}}_{\mathrm{p}}$ ) and at constant volume (${\mathrm{C}}_{\mathrm{v}}$) is :

   1. A.$6$
   2. B.$\frac{7}{2}$
   3. C.$\frac{5}{2}$
   4. D.$\frac{7}{5}$
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   Answer: D

3. Q582017 · 8 Apr 2017 · Shift 1
   
   1. A.$0.24$
   2. B.$0.15$
   3. C.$0.32$
   4. D.$0.08$
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   Answer: B