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Please get in touch if you want to discuss the accessibility of resources we offer to support delivery of our qualifications: [email protected]This resource has been produced as part of our free Physics teaching and learning support package. All the Physics teaching and learning resources, including delivery guides, topic exploration packs, lesson elements and more are available on the qualification webpages.If you are looking for examination practice materials, you can find Sample Assessment Materials (SAMs) and a link to the Practice Papers on the qualification webpages: Physics A, Physics B.
Learner resourcesMultiple Choice Questions (MCQ) topic quizMeasurements and uncertainty1.The dimensions of a cube are measured with vernier calipers.The measured length of each side is 30.0 mm. If the vernier callipers can be read with an uncertainty of +/- 0.1 mm. What is the approximate percentage uncertainty in the value of thevolume?
Your answer2.To find the resistivity of a semiconductor, a student makes the following measurements of a cylindrical rod of the material :length = 25 ± 1mmdiameter = 5.0 ± 0.1mmresistance = 68 ± 1 ΩThe resistivity is calculated to be 53 mΩ m. What is the uncertainty in this result?
Version 123Copyright © OCR 2016Your answer
3.Two students carry out an experiment to determine the ratio of potential difference across two resistors R1and R2which are connected in series across a low voltage d.c. supply. The resistors have different values such that R2= 10 R1Thevoltmeter used to take the readings gives a reading of 0.2V before any potential difference is applied.Amy takes one measurement across each resistor and calculates the ratio as V1/V2Matthew changes the supply voltage and takes a series of readings for V1and V2. He then plots a graph of V1against V2and uses the gradient of his graph to determine V1/VWhich of the following statements is true?..2.
Your answerVersion 124Copyright © OCR 2016
4.The diameter of a wire being tested is measured as d = 0.40 ± 0.005 mm.What is the percentage uncertainty in the result of the calculation when d is used to determine cross sectional area of the wire?A2.50%B1.56%C1.25%D0.016%
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