Caliper Assessment Vernier Measurement

Question 1

A vernier caliper has a main scale reading of 23 mm and the 6th vernier division aligns with a main scale line. If the vernier has 25 divisions equal to 24 mm, what is the measurement?

Accepted Answer

23.24 mm

Answer

The least count is 1/25 mm = 0.04 mm, so 6 × 0.04 = 0.24 mm, giving 23 + 0.24 = 23.24 mm.

Question 2

Which part of a vernier caliper is used specifically to measure the internal diameter of a hollow object?

Accepted Answer

Upper jaws

Answer

The upper (inside) jaws are designed to measure internal dimensions such as bore diameters.

Question 3

A metric vernier caliper reads 47.35 mm. When converted to inches (1 inch = 25.4 mm), what is the nearest correct reading?

Accepted Answer

1.864 in

Answer

47.35 ÷ 25.4 ≈ 1.864 inches.

Question 4

What does 'parallax error' mean in the context of reading a vernier caliper?

Accepted Answer

Error from reading the scale at an angle rather than straight on

Answer

Parallax error occurs when the observer's line of sight is not perpendicular to the scale, causing an apparent shift in the reading.

Question 5

On a 50-division vernier caliper (50 vernier divisions = 49 mm), what is the least count?

Accepted Answer

0.02 mm

Answer

Least count = 1 mm − (49/50) mm = 1 − 0.98 = 0.02 mm.

Caliper Assessment Practice Test

Caliper Assessment Practice Test

Caliper Assessment Vernier Measurement