Question

0.985
20.78
5078
0.178
0.856

Explanation:

Step1: Read main - scale value

The main - scale reading of the vernier caliper is 20 mm.

Step2: Read dial value

The dial reading is 78 (assuming the dial has a least - count of 0.01 mm). The value from the dial is 0.78 mm.

Step3: Calculate total measurement

The total measurement is the sum of the main - scale value and the dial value. So, \(20 + 0.78=20.78\) mm.

Answer:

20.78