Question

If mass attached to the spring is made 2 time heavier how many time the period of oscillation changes

Answer 1

There will not be any change because the oscillation depends on the length of the string not the mass of the bob

Answer 2

A period is the amount of time required to complete one cycle in an oscillation system such as a pendulum, a mass on a spring or an electronic circuit. In one cycle, the system moves from a starting position through maximum and minimum points, then returns to the beginning point before starting a new identical cycle. So that factors that affect the period of oscillation by examining the equations that determined the period for an oscillation system.