किस मापक यंत्र में तीन पैरों पर टिका हुआ एक धातु का त्रिकोणीय ढांचा होता है, जिसका उपयोग लेंस और घुमावदार दर्पणों जैसी गोलाकार वस्तुओं की वक्रता त्रिज्या को मापने के लिए किया जाता है?

Which of the following territories was annexed by Lord Dalhousie under the pretext of misgovernance, and not directly through the Doctrine of Lapse?

What was the primary stated reason for the Partition of Bengal in 1905 by Lord Curzon?

Which of the following events is considered the immediate trigger for the launch of the Non-Cooperation Movement by Mahatma Gandhi?