Which of the following biometric devices is used to take impressions of the friction ridges of the
skin on the underside of the tip of the fingers?

A.
Facial recognition device

B.
Iris camera

C.
Voice recognition voiceprint

D.
Fingerprint reader

Explanation:

A fingerprint reader is used to take impressions of the friction ridges of the skin on the underside of
the tip of the fingers. Fingerprints help in identifying users and are unique and different to
everyone and do not change over time. Even identical twins who share their DNA do not have the
same fingerprints. Police and Government agencies have used these modes in order to identify
humans for many years, but other agencies are starting to use biometric fingerprint readers for

identification in many different applications.A fingerprint is created when the friction ridges of the
skin come in contact with a surface that is receptive to a print by means of an agent to form the
print like perspiration, oil, ink, grease, and many more. The agent is then transferred to the surface
and leaves an impression which creates the fingerprint.
Answer option B is incorrect. An iris camera is used to perform recognition detection of a user’s
identity by mathematical analysis of the random patterns that are visible within the iris of an eye
from some distance. It is used to combine computer vision, pattern recognition, statistical
inference, and optics.
Answer option A is incorrect. A facial recognition device helps in viewing an image or video of a
person and compares it to one that is in the database. It performs facial recognition by comparing
the following:Structure, shape, and proportions of the face Distance between the eyes, nose,
mouth, and jaw Upper outlines of the eye sockets The sides of the mouth Location of the nose and
eyes The area surrounding the check bonesAnswer option C is incorrect. A voice recognition
voiceprint is a spectrogram, which is a graph that shows a sound’s frequency on the vertical axis
and time on the horizontal axis. Different speech sounds help in creating different shapes on the
graph. Spectrograms also use color or shades of gray to represent the acoustical qualities of
sound.