Work, Energy & Power · JEE Main previous year questions

2017 2 questions

1. Q352017 · 9 Apr 2017 · Shift 1

   N moles of a diatomic gas in a cylinder are at a temperature T. Heat is supplied to the cylinder such that the temperature remains constant but n moles of the diatomic gas get converted into monoatomic gas. What is the change in the total kinetic energy of the gas ?

   1. A.$\frac{1}{2}\mathrm{nRT}$
   2. B.$0$
   3. C.$\frac{3}{2}\mathrm{nRT}$
   4. D.$\frac{5}{2}\mathrm{nRT}$
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   Answer: A

2. Q342017 · 8 Apr 2017 · Shift 1

   An object is dropped from a height h from the ground. Every time it hits the ground it loses 50% of its kinetic energy. The total distance covered as $t\to \infty$ is :

   1. A.$3\mathrm{h}$
   2. B.$\infty$
   3. C.$\frac{5}{3}\mathrm{h}$
   4. D.$\frac{8}{3}\mathrm{h}$
   Show answer

   Answer: A