AIPMT 2011 Preliminary Mock Test

The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen-like ion. The atomic number $Z$ of the hydrogen-like ion is:

Which of the following is not due to total internal reflection?

A biconvex lens has a radius of curvature of magnitude $20\text{cm}$. Which one of the following options describes best the image formed of an object of height $2\text{cm}$ placed $30\text{cm}$ from the lens? (Assume refractive index $\mu =1.5$)

In photoelectric emission process from a metal of work function $1.8\text{eV}$, the kinetic energy of most energetic electrons is $0.5\text{eV}$. The corresponding stopping potential is:

Electrons used in an electron microscope are accelerated by a voltage of $25\text{kV}$. If the voltage is increased to $100\text{kV}$, then the de-Broglie wavelength associated with the electrons would: