Q. During whose time period the last major extension of British Indian territory took place?
Answer: Dalhousie
Notes: The last major extension of British Indian Territory took place during Dalhousie under his Doctrine of Lapse (Jhansi, Satara, Jaitpur, Sambalpur, Udaipur and Nagpur) and on the basis of misgovernance (Awadh). Lord Dalhousie (Real name James Andrew Ramsay) served as Governor General of India from 1848 to 1856. During this period, Second Anglo-Sikh War (1849) was fought in which the Sikhs were defeated again and Dalhousie was successful in annexing the whole of Punjab to the British administration.