Practical Skills and Data Analysis

What Practical Skills and Data Analysis covers

Practical Skills and Data Analysis is examined in Units AS 3 and A2 3, Practical Techniques and Data Analysis, and drawn on throughout the written papers. It covers choosing and using measuring instruments, precision, accuracy and recording measurements, using the cathode ray oscilloscope to measure voltage and frequency, Tables, graphs and presenting results, linearising a relationship and using the gradient, absolute and percentage uncertainty, combining uncertainties and uncertainty on a graph and random and systematic error, reliability and refining an experiment.

The 8 subtopics

Each one has its own page. CCEA AS Physics students sit this topic in the first year.

• Choosing and using measuring instrumentsRecall questions on the resolution and proper use of the metre rule, the micrometer screw gauge, the vernier caliper, the balance, the stopwatch, the thermometer, the multimeter and the protractor, reading a meniscus, zero error and the ratchet, parallax on an analogue scale, and choosing an instrument so the reading fills its range.Open →
• Precision, accuracy and recording measurementsAccuracy of a measurement, precision of a set of measurements and set of results that is precise but not accurate.Open →
• Using the cathode ray oscilloscope to measure voltage and frequencyFunction of the y-gain control on an oscilloscope and function of the time-base control on an oscilloscope.Open →
• Tables, graphs and presenting resultsRecall questions on laying out raw and processed values in a table, which variable goes on each axis, choosing a scale and when a false origin is allowed, drawing a best-fit line, finding a gradient and its units, what an intercept means, the significance of an area under a curve, and how to treat an anomalous point.Open →
• Linearising a relationship and using the gradientRecall questions on why an experiment is designed to give a straight line, y = mx + c applied to experimental quantities, what to plot for a pendulum, for a resistivity determination and for a capacitor discharge, testing an inverse proportionality and an unknown power law, and what a line through the origin adds.Open →
• Absolute and percentage uncertaintyAbsolute uncertainty in a measurement and fractional uncertainty in a measurement.Open →
• Combining uncertainties and uncertainty on a graphRecall questions on adding absolute uncertainties for a sum or difference and percentage uncertainties for a product or quotient, multiplying by the power for a raised quantity, worked combinations for a resistivity and a pendulum determination, error bars and the worst acceptable line, and rounding a result to match its uncertainty.Open →
• Random and systematic error, reliability and refining an experimentRandom error, systematic error and zero error.Open →

What you need to know

Answer each one before you reveal it.

Take Practical Skills and Data Analysis further

The same content, four other ways.

Questions from this topic

Each one with the model answer underneath.

1. 1

   Which instruments are used to measure mass, and how do they differ in what they respond to?

   Model answer

   A top-pan balance measures the downward force on the pan and is calibrated to display a mass in grams or kilograms for the local gravitational field strength, whereas a spring balance stretches under the weight of the object, so its scale depends directly on the local gravitational field strength.

2. 2

   What is a micrometer screw gauge used for, and what is its resolution?

   Model answer

   It is used to measure small lengths such as the diameter of a wire or the thickness of a sheet, typically up to 25 mm, and its resolution is 0.01 mm.

3. 3

   What is a vernier caliper used for, and what is its typical resolution?

   Model answer

   It measures lengths of the order of a few centimetres, including external and internal diameters and the depth of a hole, with a typical resolution of 0.1 mm or better.

4. 4

   State the resolution of a metre rule and explain why the uncertainty in a measured length is usually taken as twice that value.

   Model answer

   The resolution is 1 mm, but a length is found from the difference between two readings, one at each end, so each carries its own reading uncertainty and the uncertainty in the difference is about 2 mm.

5. 5

   Which length-measuring instrument would you choose for a wire of diameter about 0.4 mm, and why not the others?

   Model answer

   A micrometer screw gauge is needed, because its 0.01 mm resolution gives an uncertainty of only a few per cent on 0.4 mm, whereas a rule reading to 1 mm could not resolve the diameter at all.

6. 6

   How should the volume of a liquid be read from a graduated cylinder?

   Model answer

   Stand the cylinder on a level surface and read the scale with the eye at the same height as the liquid surface, taking the reading at the bottom of the meniscus for water, so that parallax does not distort the value.

What is inside Levo

Six ways to work the same material.

Practical Skills and Data Analysis revision questions

Is Practical Skills and Data Analysis examined at AS in CCEA Physics?

Yes. It sits in Units AS 3 and A2 3, which you take in the first year, so it is on the AS paper as well as counting towards the full A level.

What does Practical Skills and Data Analysis cover in CCEA AS-Level Physics?

8 subtopics: choosing and using measuring instruments, precision, accuracy and recording measurements, using the cathode ray oscilloscope to measure voltage and frequency, tables, graphs and presenting results, linearising a relationship and using the gradient, absolute and percentage uncertainty, combining uncertainties and uncertainty on a graph and random and systematic error, reliability and refining an experiment. Each one has its own page with questions and model answers.

How is Practical Skills and Data Analysis organised?

By the CCEA 1210 specification, subtopic by subtopic, so it matches the order you are taught it in.