Which instrument is most suitable for measuring the thickness of a thin wire?

Which of the following can be measured using an instrument?

Which of the following is a non-physical quantity?

Which one of the following is a base physical quantity?

Which quantity is derived from distance and time?

The SI base unit of electric current is:

Which SI prefix represents one thousandth part of a unit?

Why is scientific notation useful in physics?

The least count of a metre rule is usually:

Which error is caused by reading a scale from an incorrect eye position?

Which statement best defines a physical quantity?