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What unit does a relative error in a measurement have?

Important Questions on Units and Measurements

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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 20
How many zeroes appearing in the number 0.0040500, are significant?
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 21
What error does a vernier callipers have when zero mark of vernier scale does not coincide with zero mark of main scale?
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 22
Write the dimensional formula for power.
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 23
Round off the number 9.8953 to three significant figures.
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 24
Write 623.5 cm in scientific notation.
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 25
What is the relation between 1AU and 1 parsec?
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 26
Name various instruments and methods used to estimate very small distances.
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 27
What principle is used in a mass spectrograph to estimate the mass of a charged particle?