(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

(a) A vernier scale has 10 divisions. It slides over the main scale, whose pitch is 1.0 mm. If the number of divisions on the left hand of zero of the vernier scale on the main scale is 56 and the 8th vernier scale division coincides with the main scale, calculate the length in centimetres.
(b) If the above instrument has a negative error of 0.07 cm, calculate the corrected length.

(a) A vernier scale has 20 divisions. It slides over the main scale, whose pitch is 0.5 mm. If the number of divisions on the left hand of the zero of vernier on the main scale is 38 and the 18th vernier scale division coincides with the main scale, calculate the diameter of the sphere, held in the jaws of vernier callipers.
(b) If the vernier has a negative error of 0.04 cm, calculate the corrected radius of the sphere.

The least count of a vernier callipers is 0.0025 cm and it has an error of + 0.0125 cm. While measuring the length of a cylinder, the reading on the main scale is 7.55 cm, and the 12th vernier scale division coincides with the main scale. Calculate the corrected length.

The least count of a vernier callipers is 0.01 cm and it has an error of + 0.07 cm. While measuring the radius of a sphere, the main scale reading is 2.90 cm and the 5th vernier scale division coincides with the main scale. Calculate the correct radius.

Who invented vernier callipers?

What is the need for measuring length with vernier callipers?

Up to how many decimal places can a common vernier callipers measure the length in cm?

Define the term pitch.

Define the term least count as applied to a vernier callipers.

State the formula for determining a pitch

State the formula for determining least count for a vernier callipers.

State the formula for calculating length if:

Number of vernier scale division coinciding with the main scale and number of division of main scale on the left-hand side of zero of vernier scale is known.

State the formula for calculating length if:

The reading of the main scale is known and the number of vernier scale divisions coinciding with the main scale is known.

What do you understand by the term zero error?

When does a vernier callipers has the positive error?

When does a vernier callipers has the negative error?

State the correction if the positive error is 7 divisions when the least count is 0.01 cm.

State the correction if the negative error is 7 divisions when the least count is 0.01 cm.

Which part of vernier callipers is used to measure the external diameter of a cylinder?

Which part of vernier callipers is used to measure the internal diameter of a hollow cylinder?