Which jaws of Vernier callipers measure the external diameter of a sphere?

If one main-scale division is 1 mm and one Vernier division is 0.9 mm, the least count is:

A Vernier main-scale reading is 2.5 cm and the coinciding division is 7. If least count is 0.01 cm, the reading is:

Ten Vernier divisions occupy 9 mm. The length of one Vernier division is:

A positive zero error in Vernier callipers makes the observed reading:

A ruler reading viewed from point A instead of directly above point B will most likely contain:

Which instrument is best for measuring the diameter of a thin wire?

Which instrument is most suitable for measuring the length of a classroom?

The main scale of a typical micrometer is marked in intervals of:

Which compound prefix is not allowed in SI?

A micrometer with 1 mm pitch and 100 circular divisions has least count: