https://foxoyo.com/amp/mcq/42796/a-solid-copper-sphere-is-suspended-from-a-massless-spring-the-time-period-of-oscillation-of-the-system-is-4-s-the-sphere-is-now-completely-immersed-in-a-liquid-whose-density-is-18th-that-of-brass-the-sphere-remains-in-liquid-during-oscillation-now-the-time-period-is