Misc: In what Australian state would you find Darwin?

Questions

The fluorescent tube uses ___% of the power to produce an equal amount of light as a tungsten filament bulb?

The tip of a rotary mower travels at over _____ km/hr?

In an atom, the electron weighs _________ th of the weight of the proton?

The world's oldest man-made alloy is?

Rainfall is measured with a?