एक प्रॉक्सिमिटी स्विच (proximity switch) मुख्य रूप से किसी वस्तु की उपस्थिति का पता कैसे लगाता 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?