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Solved conceptual questions on Measurement of First Year Physics

Q 1 Define the number π and show that 2π radians = 360°

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Q 2 Define the terms error, uncertainty, precision and accuracy in measurement.

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Q 3 Explain several repetitive phenomena occurring naturally which could serve reasonable time standard.

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Q 4 Why do we find it useful to have two units for the amount of substance, kilogram and mole?

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Q 5 Show that the famous Einstein equation E = mc2 is dimensionally consistent?

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Q 6 Deduce the dimensions of gravitational constant.

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Q 7 Find the dimensions of Kinetic Energy?

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Q 8 Give the drawbacks to use the period of a pendulum as time standard.

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Q 9 Are radian and steradian the base units? Justify your answer.

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Q 10 What does the word ‘micro’ signify in the words ‘microwave oven’?

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Q 11 Density of air is 1.2 kgm-3. Change it in gm cm3

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Q 12 An old saying is that ‘A chain is only as strong as its weakest link’. What analogous statement can you make regarding measurement.

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Q 13 Differentiate between the following.

  1. Light year
  2. Year

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