Q. Which of the following was not among the locations where astronomical observatories (Jantar Mantar) were set up by Sawai Jai Singh, the ruler of Amber during Mughal era?
Answer: Agra
Notes: The influential Rajput families claimed the subadari of the rich provinces of Gujarat and Malwa. Raja Ajit Singh of Jodhpur held the governorship of Gujarat and Sawai Raja Jai Singh of Amber was governor of Malwa. Sawai Raja Jai Singh founded his new capital at Jaipur and was given the subadari of Agra in 1722. Sawai Jai Singh, the ruler of Amber constructed five astronomical observatories, one each in Delhi, Jaipur, Ujjain, Mathura and Varanasi. Commonly known as Jantar Mantar, these observatories had various instruments to study heavenly bodies.