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How do we work out percentage uncertainty given the range?
Range/2 - Uncertainty
Uncertainty/mean x 100 = percentage uncertainty
How can a student confirm that a rod has uniform diameter using a thread?
If the rod has uniform diameter, it balances horizontally on a thread when placed in the middle.
Because the mass/moment on either side of the rod is equal.
And centre of mass is in the middle
The ratio of porential difference = ratio of resistances.
What apparatus do we use to measure the volume of a liquid?
Measuring cylinder
What is the resolution of a vernier calliper, micrometer screw gauge and meter ruler?
resolution of vernier calipers is 0.1 mm
resolution of a micrometer screw gauge is 0.01 mm
The resolution of a metre rule is 0.1 cm
Note 
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