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Question

Which of the below-given instruments has 0.01 mm as its least count?


A

Screw gauge

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B

Vernier Caliper

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C

Thermometer

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D

None of the above

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Solution

The correct option is A

Screw gauge


Step 1: Explanation of the correct option

In the case of option A

  1. A screw gauge is a tool for precisely measuring the thickness of a metal sheet or the diameter of a thin wire.
  2. The smallest value that a measuring instrument can measure is referred to as its least count.
  3. It can be calculated by dividing the screw pitch by the number of divisions on a circular scale.
  4. The least count of a screw gauge is 0.01 mm.

Step 2: Explanation for the incorrect options

In the case of option B

  1. A Vernier Caliper is a measuring tool used to determine the width, height, and radius of a body.
  2. It has the least count of 0.1mm.

In the case of option C

  1. The thermometer is an instrument that is used for measuring the temperature of a body.
  2. There are three units that are commonly used for measuring the temperature of a body. They are Celsius, Fahrenheit, and kelvin.

In the case of option D

Since the correct answer is available in the given option so none of the above is not the case here.

Hence, option A is the correct answer.


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