List of top Physics Questions on Uniform Circular Motion asked in Haryana PMT

A stone tied to one end of spring $80\,cm$ long is whirled in a horizontal circle with a constant speed. If stone makes $25 $ revolutions in $14 \sec$, the magnitude of acceleration of stone is :

A body of mass $1\, kg$ is rotating in a vertical circle of radius $1\, m$. What will be the difference in kinetic energy at the top and at the bottom of the circle? $\left(\right.$ take $\left.g=10\, m / s ^{2}\right)$