सदस्यों के एक प्रारंभिक समूह का मुखबिरों (informants) के रूप में उपयोग करके एक विशेष आबादी की सूची या नमूना तैयार करने की तकनीक को क्या कहा जाता है?

Which of the following events is considered a major turning point that fueled Indian nationalism during British rule due to its brutal nature and widespread condemnation?

Which of the following events is considered the first major peasant uprising against the British in India?