Contact devices & its application

Q.  Contact devices used for the measurement of level are
- Published on 10 Nov 15

a. Less reliable then devices which does not make contact with the material
b. More reliable then devices which does not make contact with the material
c. Less reliable then devices which makes contact with the material
d. More reliable then devices which makes contact with the material

ANSWER: Less reliable then devices which does not make contact with the material

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