Heat & Thermodynamics · JEE Main previous year questions

2005 2 questions

1. Q992005 · 28 Apr 2005 · Shift 1

   Which of the following is incorrect regarding the first law of thermodynamics?

   1. A.It is a restatement of the principle of conservation of energy
   2. B.It is not applicable to any cyclic process
   3. C.It introduces the concept of the entropy
   4. D.It introduces the concept of the internal energy
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   Answer: B, C

2. Q1492005 · 28 Apr 2005 · Shift 1

   The intensity of gamma radiation from a given source is I. On passing through $36\mathrm{mm}$ of lead, it is reduced to $\frac{1}{8}$. The thickness of lead which will reduce the intensity to $\frac{1}{2}$ will be

   1. A.$9\mathrm{mm}$
   2. B.$6\mathrm{mm}$
   3. C.$12\mathrm{mm}$
   4. D.$18\mathrm{mm}$
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   Answer: C