1, 2 and 3 are corect.
Sangam literature chiefly consists of Tolkappiyam (Tamil grammar), Ettuthokai and Pathuppattu. These works provide valuable information to know the history of the Sangam Age.
Tolkappiyam was authored by Tolkappiyar and is considered the earliest of Tamil literary work. Though it is a work on Tamil grammar but it also provides insights on the political and socio-economic conditions of the time.
Ettuthokai (Eight Anthologies) consist of eight works. The Pathuppattu (Ten Idylls) consists of ten different literary works.
Pali literature includes Buddhist philosophical works, poetry and some grammatical works. Major works in Pali are Jataka tales, Dhammapada, Atthakatha, and Mahavamsa.

Tolkappiyam also refers to four castes namely arasar (ruling class), anthanar (priests), vanigar (traders), and vellalar (agriculturalists).

2, 4 and 5 are correct.
The Trinity of Carnatic music, also known as The Three Jewels of Carnatic music, refer to the outstanding trio of composer-musicians of Carnatic music in the 18th century, being Tyagaraja, Muthuswami Dikshitar and Syama Sastri.

Wall relief from Cave 15, Ellora, showing Vishnu as Narasimha, the man-lion. It is a work of the Rashtrakuta period.

Both 1 and 2 are correct.
The Dhamek stupa at Sarnath is an imposing cylindrical structure (ht. 43.5 m., dia at base 28.3 m.) of the Gupta age, partly built of stone and partly of brick. Its stone basement has eight projecting faces with large niches for statuary and is further adorned with delicately-carved floral and geometrical patterns.
Making the holy spot of the enlightenment of the Master, this site is looked upon with, greatest sanctity and became a flourishing Buddhist establishment with numerous temples, stupas and monasteries. According to tradition a large number of shrines and memorials were created at the site to commemorate the incidents before and after enlightenment.