Question

How nationalist leaders did mobilize the masses in the swadeshi and boycott movements?

Answer 1

Hint: That was a movement in the year $1907$ against the partition of India and Bengal by the British Government. During this movement, the British made items were thrown into the fire. People were encouraged to purchase India made items only.

Complete answer:
The Swadeshi Movement included boycotting British goods and selling Indian goods. It started with the Partition of Bengal in $1905$. It had some major consequences in India. When people began boycotting foreign goods, the demand for Indian goods reached up, especially textiles. This came as a benefit for Indian textile mills in Bombay and Ahmedabad. In Bengal, the rough cloth was produced which was the tradition there. Although rough, people used the cloth in the spirit of the Swadeshi. V. O. Chidambaram Pillai began Swadeshi Steam Navigation Company. It was inaugurated in \[1906\] as a countermeasure to British troops. It mainly went on the Tuticorin-Colombo route. This was the source of the Swadeshi movement. Its concept gained strength in the years to come. Mahatma Gandhi developed the idea of Swadeshi to include Indian manufacturers.
Many reputed industrialists like R. D. Tata came up during this period.
So, Swadeshi went far and behind the events of $1905 - 1906$

Note: The government's preference to partition Bengal was declared in December $1903$. The official reason was that Bengal, among a population of $78$ million, was too large to be governed. The true reason, though, the center of the revolt, and company officials could not control the protests which they thought would spread throughout India.
Bengal was separated by language religion. The westbound would be primarily Hindu and the eastern half would be originally Muslims. This divide-and-conquer approach sparked the Swadeshi movement.