What does a spirit level show?
AnswerWhether a surface is level
A bubble in a liquid-filled vial centers between the lines when a surface is level or plumb.
Challenge · Facts & stats
Challenge Tools facts & stats
7 fact-checked facts about tools, measuring instruments and simple machines, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
How many inches are in one foot?
Answer12
One foot equals 12 inches, and three feet make one yard.
Going deeper
A screw is a modified form of which simple machine?
AnswerInclined plane
A screw's thread is an inclined plane wrapped around a cylinder.
What does a multimeter measure?
AnswerVoltage, current and resistance
A multimeter combines a voltmeter, ammeter and ohmmeter to measure electrical quantities.
What does a hygrometer measure?
AnswerHumidity
A hygrometer measures humidity; barometers measure air pressure, anemometers wind speed and seismometers earthquakes.
Expert level
A wheelbarrow is an example of which class of lever?
AnswerSecond-class lever
In a wheelbarrow the load sits between the fulcrum (the wheel) and the effort (the handles), making it a second-class lever.
The sliding measuring scale on a precision caliper is named after which inventor?
AnswerPierre Vernier
The vernier scale is named after French mathematician Pierre Vernier, who described it in 1631.
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