After the general elections, the Pro tem Speaker is

After the general elections, the Speaker of the previous Lok Sabha vacates office immediately before the first meeting of the newly elected House [1]. Under Article 95(1) of the Constitution, the President of India appoints a member of the Lok Sabha to perform the duties of the Speaker when the office is vacant; this appointee is known as the Speaker Pro Tem [2]. While parliamentary convention dictates that the senior-most member of the House is usually selected for this role, the official authority for the appointment rests solely with the President [1]. The President also administers the oath of office to the Pro Tem Speaker [2]. The primary duties of the Pro Tem Speaker include presiding over the first sitting of the new Lok Sabha, administering oaths to newly elected members, and facilitating the election of the permanent Speaker, at which point the Pro Tem office ceases to exist [2].

Sources

1. [1] Laxmikanth, M. Indian Polity. 7th ed., McGraw Hill. > Chapter 23: Parliament > Speaker Pro Tem > p. 232
2. [2] Laxmikanth, M. Indian Polity. 7th ed., McGraw Hill. > Chapter 23: Parliament > Speaker Pro Tem > p. 233