Correct option is A
The correct answer is option (A) Polygraph
- A polygraph is a lie detector apparatus that measures and records several physiological indicators, such as heart rate, blood pressure, respiratory rate, and skin conductivity, while a person is being questioned.
- The theory behind the polygraph is that deceptive answers will produce physiological responses that are distinct from those associated with truthful answers.
Information Booster :-
- A seismograph is an instrument used to detect and record the motion of the Earth's surface.
- A barograph is a type of barometer that records atmospheric pressure over time. It is typically used in meteorology.
- A polarimeter is an instrument used to measure the optical rotation of substances, typically used in chemistry to analyze substances like sugars.