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Why is that for both very small as well ...

Why is that for both very small as well as very large (in addition to ordinary) quantities, the physical measurements are usually expressed in scientific notation, with powers of ten ?

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To denote the precision of the measurement.
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Explain this statement clearly : "To call a dimensional quantity 'large' or 'small' is meaningless without specifying a standard for comparison". In view of this, reframe the following statements wherever necessary: (a) atoms are very small objects (b) a jet plane moves with great speed (c) the mass of jupiter is very large (d) the air inside this room contains a large number of molecules (e) a proton is much more massive than an electron (f) the speed of sound is much smaller than the speed of light.

Covalent molecules formed by heteroatoms bound to have some ionic character. The ionic character is due to shifting of the electron pair towards A or B in the molecule AB. Hence, atoms acquire small and equal charge but opposite in sign. Such a bond which has some ionic character is described as polar covalent bond. Polar covalent molecules can exhibit dipole moment. Dipole moment is equal to the product of charge separation, q and the bond length, d for the bond. The unit of dipole moment is Debye. One Debye is equal to 10^(-18) esu cm. Dipole moment is a vector quantity. It has both magnitude and direction. Hence, dipole moment of molecules depends upon the relative orientation of the bond dipoles, but not on the polarity of bonds alone. A symmetrical structure shows zero dipole moment. Thus, dipole moments help to predict the geometry of the molecules. Dipole moment values can be used to distinguish between cis-and traps-isomers, ortho-, meta-and para-forms of a substance, etc. The percentage of ionic character of a bond can be calculated by the application of the following formula : % " ionic character " = ("Experimental value of dipole moment ")/("Theoretical value of dipole moment ") xx 100 The dipole moment of NF_(3) is very much less than that of NH_(3) because :

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Answer the following questions: (a) A steady current flows in a metallic conductor of non-uniform cross-section. Which of these quantities is constant along the conductor: current, current density electric field, drift speed ? (b) Is Ohm's law universally applicable for all cnducting elements ? If not, give examples of elements which do not obey Ohm's law. (c ) A low voltage suply from which one needs high currents must have very low internal resistance.Why (d) A high tension (HT) supply of say, 6kV must have a very large internal resistance, Why ?

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AAKASH SERIES-UNITS AND MEASUREMENTS-VERY SHORT ANSWER TYPE QUESTIONS
  1. By taking precautions, can we minimize the random erros?

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  2. Why is that for both very small as well as very large (in addition to ...

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  3. The unit of length, metre was originally defined as the distance betwe...

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  4. Orginally the 'foot' of human being is taken as a unit of length. Wha...

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  5. As far as mechanics is concerned all systems of units are having the s...

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  6. Two physical quantities are having the same dimensions. Does it mean t...

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  7. Two physical quantities are having the same dimensions. Should their u...

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  8. Why is the dimension of one fundamental (base) quantity interms of any...

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  9. A dimensionally wrong equation in which principle of homogenity of dim...

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  10. State about the correctness or otherwise of the following two statemen...

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  11. Can we derive the kinematic relations V= u+ at , S = ut = 1/2 at^2 and...

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  12. What is an error? What are constant errors?

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  13. What is the convenience in using SI?

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  14. Is dimensional analysis applicable to only SI ?

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  15. What is meant by Unit? What is the importance of a unit?

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  16. Define a coherent system of units.

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  17. Name two coherent systems of units.

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  18. Give names of supplementary physical quantities and their units.

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  19. Define elementary physical quantities .

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  20. Give names of elementary physical quantities.

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