PHYSICS - UNITS AND MEASUREMENT - CLASS 11 - ASSIGNMENT 1

 PHYSICS ASSIGNMENT 1

CLASS 11

UNITS AND MEASUREMENTS


1. What are physical quantities?


2. Name and define the two types of physical quantities. Give examples.


3. What is measurement of a physical quantity? 


4. Write the relationship between the numerical value of a quantity and the size of the unit.


5. What is a physical unit? Write the desirable characteristics of a physical unit.


6. What is a system of units. Mention the various types of system of units.


7. Name all the basic and supplementary units of SI.


8. Define coherent system of units.


9. State the advantages of SI units.


10. State the rules followed in writing SI units in symbolic form.


11. Make a list of various prefixes used for powers of 10. Give some examples. 


12. Express the following in metres:

      a.  1 nanometre

      b.  1 angstrom 

      c.  1 fermi

      d.  1 micron

      e.  1 light year

      f.   1 astronomical unit

       g.  1 parsec


13. Define Atomic mass unit.


14. Name some practical units for measuring time.


15. Define order of magnitude of a physical quantity. How is it determined? Give an example.


16. Define mass and weight.  Give their SI units.


17. What do you mean by seven dimensions of the world?


18. Define dimensions of a physical quantity.  Explain with an example.


19. What is meant by dimensional formula and dimensional equation? Give examples.


20. Deduce the dimensional formula for:

     a. Area                          g. Angular velocity

     b. Volume                     h. Density

     c. Force                         i. Planck's constant

     d. Work                         j. Gravitational constant

     e. Energy                      k. Velocity

     f. Power                        l.  Acceleration


21. Classify variables and constants on the basis of dimensions? Give examples.


22. Give some applications of dimensional analysis.


23. How can a physical quantity be converted from one system of units to another?  Explain with an example.


24. State the principle of homogeneity of dimensions.  What is its basis?


25. How can we check the dimensional correctness of a physical equation?  Explain with an example.


26. How can the method of dimensions be used to deduce a relation among the physical quantities?  Explain with an example.


27. Mention the limitations of the method of dimensional analysis.


28. What is meant by significant figures in a measured quantity?


29. State the rules for counting the number of significant figures in a measured quantity.


30. State the rules for determining the significant figures in the sum, difference, product and quotient of two numbers.


31. Distinguish between dimensional and non dimensional variables.


32. Distinguish between dimensional and non dimensional constants.



      

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