Step 1: Background.
In 1932, the British government announced the Communal Award, which provided separate electorates for depressed classes (later called Scheduled Castes). Dr. B.R. Ambedkar initially supported this as it gave political representation to the depressed classes.
Step 2: Gandhi’s opposition.
Mahatma Gandhi opposed separate electorates on the grounds that it would divide Hindu society permanently. While in Yerwada jail, he began a fast unto death in protest.
Step 3: Agreement.
To resolve the issue, an agreement was signed on 24th September 1932 between Gandhi and Ambedkar. This was known as the Poona Pact. It replaced separate electorates with reserved seats for depressed classes within the general Hindu electorate.
Step 4: Conclusion.
Therefore, the Poona Pact was signed in 1932.
\[
\boxed{\text{Correct Answer: 1932}}
\]