AIPMT 2011 Mains Mock Test

Two wires under tension $T$ have frequency $600\text{Hz}$. Fractional increase in tension of one to produce $6\text{beats/s}$ is:

A mass on a string rotates on a table. If radius is decreased by factor of $2$ by pulling the string, the kinetic energy will:

Electric potential $V=4x^2\text{V}$. The electric field at $(1,0,2)$ is:

Charges $+q$ are at corners of isosceles $\Delta ABC$ (sides $BC=AC=2a$). $D,E$ are midpoints of $BC,CA$. Work done in moving $Q$ from $D$ to $E$ is:

Minimum value of $u$ so a particle of mass $m$ does not return to earth (Mass $M$, Radius $R$):