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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

1.3.3 Use of Digital Instruments – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
A digital meter shows 4.76 V. A suitable uncertainty is:
± 0.1 V
± 0.5 V
± 0.01 V
± 0.001 V
2.
Why is a balance tared with an empty beaker on the pan?
To remove the beaker mass from the displayed value
To increase resolution
To remove random error
To change the range
3.
A voltage of 0.05 V is measured as 0.05 V (resolution 0.01 V). The percentage uncertainty is:
0.2%
2%
200%
20%
4.
An ideal digital voltmeter should have:
A very small resistance
A very large resistance
A resistance equal to the circuit
A negative resistance
5.
The last digit of a display keeps changing between 3 and 5. The best approach is to:
Record the highest value
Ignore the display
Switch off the instrument
Record a mid value and treat the fluctuation as an uncertainty
6.
R = V/I where V has 0.2% and I has 0.5% uncertainty. The percentage uncertainty in R is:
0.7%
0.3%
0.1%
0.5%
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