Where constructed observatories by Maharaja Jai Singh-II? 1. Delhi 2. Jaipur 3. Ujjain 4. Varanasi Code
Think of Disintegration of the Mughal Empire as a book you have already read. On the page about where constructed observatories by Maharaja Jai Singh-II, the name written there is 1, 2, 3 and 4. That is the whole answer. No trick here. Just a simple fact that you can recall in a few seconds.
Ref: [UPPCS (Mains) 2007 Maharashtra PSC (Pre) 2017] | Satish Chandra, Medieval India, and NCERT History textbooks discuss Disintegration of the Mughal Empire and explain the political, administrative and cultural developments that support the correct answer for this question.