Which hand tool is mainly used to drive nails?
AnswerHammer
A hammer delivers a sharp blow to drive nails into wood and other materials.
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
What does a stopwatch measure?
AnswerElapsed time
A stopwatch is started and stopped to measure how much time passes.
Going deeper
What shape is the tip of a Phillips screwdriver?
AnswerA cross
A Phillips screwdriver has a cross-shaped tip that fits screws with a matching cross recess.
What does a multimeter measure?
AnswerVoltage, current and resistance
A multimeter combines a voltmeter, ammeter and ohmmeter to measure electrical quantities.
How many millimeters are in one centimeter?
Answer10
The prefix 'centi' means a hundredth and 'milli' a thousandth, so 1 cm equals 10 mm.
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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