Q. Where did the telegraph line be laid first? Answer:
Calcutta to Agra
Notes: India’s first telegraph line and office was opened in October 1851, between Calcutta and Diamond Harbour along the busy shipping route on the Hooghly. The first telegraph line from Calcutta to Agra was opened in 1854, covering a distance of 800 miles. Soon, telegraph lines linked Agra, Bombay, Calcutta, Lahore, Varanasi, and other cities.