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Course: OCR A Level Physics A H556
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Curriculum

OCR A Level Physics A H556

1. Development of Practical Skills in Physics

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2. Foundations in Physics

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3. Forces and Motion

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4. Electrons, Waves and Photons

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OCR H556 chapter questions and answers

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Quiz

1.1.2 Control Variables – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
In an investigation of how the extension of a copper wire depends on load, which should be a control variable?
The load
The original length of the wire
The extension
The reading on the ruler
2.
Which is the best way to keep a wire at constant temperature while measuring its resistance?
Use a large current
Leave it connected for a long time
Use a small current and switch off between readings
Wrap it in a thick cloth
3.
A control experiment in a radioactivity investigation is:
a measurement with the source closest to the detector
a repeat of the experiment
a measurement with a stronger source
a measurement with no source present
4.
A pendulum experiment varies the length. Which is NOT a suitable control variable?
Period
Mass of the bob
Amplitude
Position of the pivot
5.
A student measures the speed of a trolley down a slope for different masses but forgets to keep the slope angle the same. The experiment is:
valid because mass was varied
invalid because two variables changed
reliable because it was repeated
accurate by definition
6.
Which instrument helps control the variable 'amplitude' for a pendulum?
A voltmeter
A micrometer
A protractor and fixed release mark
A thermometer
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Part of 1. Development of Practical Skills in Physics — see every lesson and quiz in this unit.
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