The reason for the double helical structure of $DNA$ is the operation of

  • A
    Van der Waals forces
  • B
    Dipole-dipole interaction
  • C
    Hydrogen bonding
  • D
    Electrostatic attractions

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Which of the following is not a state function?

Which of the following metals becomes passive towards concentrated $HNO_3$?

The resistance of a wire is $R$. It is bent at the middle by $180^{\circ}$ and both the ends are twisted together to make a shorter wire. The resistance of the new wire is

$\frac{\sin 1^{\circ}+\sin 2^{\circ}+\ldots+\sin 89^{\circ}}{2(\cos 1^{\circ}+\cos 2^{\circ}+\ldots+\cos 44^{\circ})+1} = $

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