# GENERAL KNOWLEDGE

## GK

### PHYSICS

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The diameter of a copper wire is thought to be approximately 0.3 mm. Which instrument should be used to obtain a more accurate measurement of the diameter of the wire?
 A measuring tape B metre rule C micrometer D ruler
Explanation:

Detailed explanation-1: -A screw gauge is a precision instrument. It is used for measuring diameter of circular objects mostly wires, with an accuracy of 0.001 cm.

Detailed explanation-2: -A screw gauge is an instrument that is used for measuring the diameter of thin wires, and the thickness of thin sheets such as those made up of glass or plastics. Applications of a screw gauge: To measure the exact diameter of a wire and thus its radius.

Detailed explanation-3: -The screw gauge is an instrument used for measuring accurately the diameter of a thin wire or the thickness of a sheet of metal. It consists of a U-shaped frame fitted with a screwed spindle which is attached to a thimble. Parallel to the axis of the thimble, a scale graduated in mm is engraved.

Detailed explanation-4: -For measuring the diameter of the wire: A micrometer screw gauge or vernier callipers. Micrometer would be best as this has the highest resolution when measuring small areas.

Detailed explanation-5: -The screw gauge is an instrument used for measuring exactly the diameter of a thin wire or the width of a sheet of metal. It comprises a U-shaped mount which is fixed with a screwed pin which is fixed to a thimble.

There is 1 question to complete.