It did not have any specific name or rather such details are not made available.
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Kapidhwaja
No, Roshvik is not the name of the chariot (rath) of Lord Krishna. The name of Krishna's chariot during the great Kurukshetra War, as described in the Mahabharata, is typically referred to as "Vijaya." Krishna served as the charioteer for Arjuna, guiding him during the battle.
The grandson of Arjuna was Parikshit - the son of Abhimanyu.
There are number of heroic things that Arjuna do in Mahabharata. The list is long and beyond the scope. Better you read the Mahabharata. Rather study the Mahabharata.
Arjuna is a hero in the Hindu epic, Mahabharata.
devdutta
Kapi Dhwaja (The Chariot With Monkey Lord, Hanumana on it's flag)
Draupadi and subhadra
The bow used by Arjuna in the Mahabharata is called the "Gandiva." It is described as a powerful and divine weapon, gifted to him by the god Agni. The Gandiva is noted for its exceptional strength and precision, symbolizing Arjuna's prowess as an archer.
Gandiva is the bow used by Arjuna. The bow was given by Lord Agni.
The name of Arjuna's bow in the Mahabharata was Gandiva. It was a celestial weapon bestowed upon him by Lord Agni, the god of fire. Gandiva played a crucial role in many of Arjuna's victories in battle.