conceptual-questions-of-measurement-chapter-1-physics-11

Solved conceptual questions on Measurement of First Year Physics

Q 1	Define the number π and show that 2π radians = 360° See answer.
Q 2	Define the terms error, uncertainty, precision and accuracy in measurement. See answer.
Q 3	Explain several repetitive phenomena occurring naturally which could serve reasonable time standard. See answer.
Q 4	Why do we find it useful to have two units for the amount of substance, kilogram and mole? See answer.
Q 5	Show that the famous Einstein equation E = mc² is dimensionally consistent? See Answer.
Q 6	Deduce the dimensions of gravitational constant. See answer.
Q 7	Find the dimensions of Kinetic Energy? See answer.
Q 8	Give the drawbacks to use the period of a pendulum as time standard. See answer.
Q 9	Are radian and steradian the base units? Justify your answer. See answer.
Q 10	What does the word ‘micro’ signify in the words ‘microwave oven’? See answer .
Q 11	Density of air is 1.2 kgm^-3. Change it in gm cm³ See answer.
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. See answer.
Q 13	Differentiate between the following. Light year Year See Answer