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9th ICSE
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The least count of  a vernier callipers is:

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Important Questions on Measurements and Experimentation

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9th ICSE
IMPORTANT
Concise Physics I.C.S.E Part I For Class 9>Chapter 1 - Measurements and Experimentation>EXERCISE–1 (B)>Q 2
A microscope has a main scale with 20 divisions in 1 cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of the main scale. The least count of microscope is :
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9th ICSE
IMPORTANT
Concise Physics I.C.S.E Part I For Class 9>Chapter 1 - Measurements and Experimentation>EXERCISE–1 (B)>Q 3
The diameter of a thin wire can be measured by :
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9th ICSE
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Concise Physics I.C.S.E Part I For Class 9>Chapter 1 - Measurements and Experimentation>EXERCISE–1 (B)>Q 1
A stop watch has 10 divisions graduated between 0-5 s marks. What is its least count?
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9th ICSE
IMPORTANT
Concise Physics I.C.S.E Part I For Class 9>Chapter 1 - Measurements and Experimentation>EXERCISE–1 (B)>Q 2
A vernier has 10 divisions and they are equal to 9 divisions of the main scale in length. If the main scale is calibrated in mm, what is its least count?
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9th ICSE
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Concise Physics I.C.S.E Part I For Class 9>Chapter 1 - Measurements and Experimentation>EXERCISE–1 (B)>Q 3
A microscope is provided with a main scale graduated with 20 divisions in 1cm and a vernier scale with 50 divisions on it of length same as that of 49 divisions of main scale. Find the least count of the microscope.
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9th ICSE
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Concise Physics I.C.S.E Part I For Class 9>Chapter 1 - Measurements and Experimentation>EXERCISE–1 (B)>Q 4
A boy uses a vernier callipers to measure the thickness of his pencil. He measures it to be 1.4 mm. If the zero error of the vernier callipers is +0.02 cm, what is the correct thickness of pencil?
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9th ICSE
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Concise Physics I.C.S.E Part I For Class 9>Chapter 1 - Measurements and Experimentation>EXERCISE–1 (B)>Q 8

While measuring the length of a rod with a vernier callipers, figure below shows the position of its scales. What is the length of the rod?

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9th ICSE
IMPORTANT
Concise Physics I.C.S.E Part I For Class 9>Chapter 1 - Measurements and Experimentation>EXERCISE–1 (B)>Q 9
The pitch of a screw gauge is 0.5 mm and the head scale is divided in 100 parts. What is the least count of the screw gauge?