Physics
A boy uses a vernier callipers to measure the thickness of his pencil. He measures it to be 1.4mm. If the zero error of vernier callipers is +0.02cm, what is the correct thickness of pencil?
Measurements
61 Likes
Answer
As we know,
Correct reading = observed reading – zero error (with sign)
Given,
Thickness of the pencil = 1.4 mm
Zero error of the vernier callipers = +0.02cm = 0.2 mm
Substituting the values in the formula above we get,
Correct reading = observed reading - zero error (with sign)
Correct reading = 1.4mm - 0.2mm
Correct reading = 1.2mm
Hence, correct thickness of pencil is 1.2 mm
Answered By
43 Likes
Related Questions
A vernier has 10 divisions and they are equal to 9 divisions of main scale in length. If the main scale is calibrated in mm, what is its least count?
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 of 49 divisions of main scale. Find the least count of the microscope.
A vernier callipers has its main scale graduated in mm and 10 divisions on its vernier scale are equal in length to 9 mm. When the two jaws are in contact, the zero of vernier scale is ahead of zero of main scale and 3rd division of vernier scale coincides with a main scale division.
Find —
(i) the least count and
(ii) the zero error of the vernier callipers.
The main scale of a vernier callipers is calibrated in mm and 19 divisions of main scale are equal in length to 20 divisions of vernier scale. In measuring the diameter of a cylinder by this instrument, the main scale reads 35 divisions and 4th division of vernier scale coincides with a main scale division.
Find —
(i) least count and
(ii) radius of cylinder.