Which prefix represents 10^-9?

Which derived unit is equivalent to metre per second?

A time interval of 2000 microseconds is equal to:

Which SI base unit and symbol are correctly matched?

Which expression is written in proper scientific notation?

Which of the following is a complete measurement?

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

Why were standard units introduced?

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

Which statement correctly describes a non-physical quantity?

Which is the correct SI symbol for second?