GENERAL KNOWLEDGE

Detailed explanation-1: -A polygraph, often incorrectly referred to as a lie detector test, is a device or procedure that measures and records several physiological indicators such as blood pressure, pulse, respiration, and skin conductivity while a person is asked and answers a series of questions.

Detailed explanation-2: -During a polygraph test, three medical instruments (pneumograph, galvanograph, and cardiosphygmograph) combined in one machine are attached to the person. The instruments include sensors to record four to six physiological responses when the person is asked questions.

Detailed explanation-3: -Blood pressure and heart rate are measured by the cardio-sphygmograph component of the polygraph, which consists of a blood pressure cuff that is wrapped around the subject’s arm. During the questioning the cuff remains inflated.