Caliper Assessment Vernier Measurement 4

Question 1

On a vernier caliper, the main scale reads 31 mm and the 18th vernier line aligns on a 20-division vernier. What is the measurement?

Accepted Answer

31.90 mm

Answer

Least count = 1/20 = 0.05 mm; reading = 31 + (18 × 0.05) = 31 + 0.90 = 31.90 mm.

Question 2

The vernier scale was invented by:

Accepted Answer

Pierre Vernier

Answer

Pierre Vernier, a French mathematician, invented the vernier scale in 1631.

Question 3

A step measurement using a vernier caliper involves:

Accepted Answer

Measuring the height difference between two surfaces at different levels

Answer

Step measurements use the lower jaw tips to find the height difference between two parallel surfaces at different elevations.

Question 4

When vernier caliper jaws show measurable wear at the tips, the instrument should be:

Accepted Answer

Sent for recalibration or replaced

Answer

Worn jaws reduce accuracy and cannot be reliably corrected in the field; the instrument needs professional recalibration or replacement.

Question 5

Which of the following correctly describes how to read the vernier scale?

Accepted Answer

Find the vernier line that most closely aligns with any main scale line

Answer

The correct technique is to identify the single vernier graduation that aligns exactly (or most closely) with a main scale graduation.

Caliper Assessment Practice Test