Question

Which of the following is not an application of a metal detector?

• A. Inspection of people at entrance of malls, airports, and bus stations.
• B. Detection of metals in food in a food processing industry.
• C. Detection of precious metals.
• D. Detection of fossils buried underground.

Answer 1

The correct option is D Detection of fossils buried underground.

A metal detector detects a metal by inducing a magnetic field in them and in return the receiver picks up that magnetic field while indicating the presence of it. Metal detectors are used for screening purpose in malls, airports, and bus stations. In food processing industry, they are used to detect presence of excess metal within the edible products. Metal detectors are also used for finding precious metals buried in earth. Detection of fossils is not possible unless there is some presence of a metal in them.