Neet PYQ 2007

The total energy of electron in the ground state of hydrogen atom is $-13.6\text{eV}$. The kinetic energy of an electron in the first excited state is:

A steady current of $1.5\text{A}$ flows through a copper voltmeter for $10\text{min}$. If the electrochemical equivalent of copper is $30\times 10^{-5}{\text{gC}}^{-1}$, the mass of copper deposited on the electrode will be:

In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential $V$ and then made to describe semi-circular paths of radius $R$ using a magnetic field $B$. If $V$ and $B$ are kept constant, the ratio $\frac{q}{m}$ will be proportional to:

Three resistances $P,Q,R$ each of $2\Omega$ and an unknown resistance $S$ form the four arms of a Wheatstone’s bridge circuit. When a resistance of $6\Omega$ is connected in parallel to $S$ the bridge gets balanced. What is the value of $S$?

The particle executing simple harmonic motion has a kinetic energy $K_0{\cos }^2\omega t$. The maximum values of the potential energy and the total energy are respectively: