AIPMT 2008 Main Mock Test

The velocity of electromagnetic radiation in a medium of permittivity $ϵ$ and permeability $\mu$ is given by:

Two periodic waves of intensities $I_1$ and $I_2$ pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is:

Two thin lenses of focal lengths $f_1$ and $f_2$ are in contact and coaxial. The power of the combination is:

A boy is trying to start a fire by focusing Sunlight on a piece of paper using an equiconvex lens of focal length $10\text{cm}$. The diameter of the Sun is $1.39\times 10^9\text{m}$ and its mean distance from the earth is $1.5\times 10^{11}\text{m}$. What is the diameter of the Sun's image on the paper?

The energy required to charge a parallel plate condenser of plate separation $d$ and plate area of cross-section $A$ such that the uniform electric field between the plates is $E$, is: