Work, Energy & Power · JEE Main previous year questions

2010 2 questions

1. Q342010 · 25 Apr 2010 · Shift 1

   The potential energy function for the force between two atoms in a diatomic molecule is approximately given by $U(x)=\frac{a}{x^{12}}-\frac{b}{x^6}$, where $a$ and $b$ are constants and $x$ is the distance between the atoms. If the dissociation energy of the molecule is $D=[U(x=\infty )-U_{atequilibrium}]$, $D$ is

   1. A.$\frac{b^2}{2a}$
   2. B.$\frac{b^2}{12a}$
   3. C.$\frac{b^2}{4a}$
   4. D.$\frac{b^2}{6a}$
   Show answer

   Answer: C

2. Q352010 · 25 Apr 2010 · Shift 1

   Statement - 1 : Two particles moving in the same direction do not lose all their energy in a completely inelastic collision. Statement - 2 : Principle of conservation of momentum holds true for all kinds of collisions.

   1. A.Statement - 1 is true, Statement - 2 is true; Statement - 2 is the correct explanation of Statement - 1
   2. B.Statement - 1 is true, Statement - 2 is true; Statement - 2 is not the correct explanation of Statement - 1
   3. C.Statement - 1 is false, Statement - 2 is true
   4. D.Statement - 1 is true, Statement - 2 is false
   Show answer

   Answer: A