In which of the following cities did Maharaja Jai Singh II NOT build the Jantar Mantar?

Correct option is A

The correct answer is (a) Allahabad.
· Maharaja Jai Singh II built five Jantar Mantars in India, located in Delhi, Jaipur, Varanasi, Ujjain, and Mathura. He did not build a Jantar Mantar in Allahabad. These astronomical observatories were constructed to study the movements of celestial bodies and are known for their architectural and scientific significance.
Information Booster:
· The Jantar Mantar in Jaipur is the largest and is a UNESCO World Heritage Site.
· These observatories were built in the early 18th century, reflecting Jai Singh II's interest in astronomy and science.