Parallax error occurs when:

Which part of Vernier callipers measures the internal diameter of a hollow object?

Which unit symbol is correctly capitalized because it is named after a scientist?

The depth of a hollow cylinder can be measured using the:

Which is the correct SI symbol for second?

A Vernier calliper has a main-scale reading of 3.2 cm. Its 6th Vernier division coincides, and its least count is 0.01 cm. The observed reading is:

Before adding two quantities written in scientific notation, their powers of ten should be:

If the Vernier zero lies to the right of the main-scale zero when the jaws are closed, the zero correction is made by:

When a decimal point is moved to the right to write a small number in scientific notation, the exponent is:

The pitch of a micrometer screw gauge is the distance moved by its spindle during:

Which expression is written in proper scientific notation?