Science - 10th lesson - 2nd term - iv

SCIENCE 
SECOND TERM PAPERS
10th LESSON - THE CORRECT USE OF THE MICROSCOPE 

1) Fill in the blanks. 

 i. When the distance between hand lens and letters are ......................................... gradually 
       the letters will appear more and more larger. (decreased, increased )

ii. distance is .......................................... further, letters become ..............................................
(decreased, increased ) (unclear, clear)

iii. ....................................... surfaces can be used to magnify small items  (Curved, straight) 

iv.  The number of times a specimen is ....................................... is called magnification. 

v. resolving power of a hand lens is ......................................... than the resolving power of  the naked eye. (lower, higher )

vi. Resolution of the naked eye is .......................... (01.1, 0.1)

vii. Magnification of a compound light microscope is ............................... times (2000, 200 )

viii. The closest lens to the eye is ....................................  (Objective lens, Eye piece )

ix.  resolution power of the compound light microscope .................. times than the huan naked eye. (50000, 5000)

x. Virus ........................ be observe by a electronic microscope (can, cannot )


2)Name 3 instances where the electronic microscope is used. 

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3) Write the functions of given parts 

Stage - ........................................................................................................................................

Mirror - ......................................................................................................................................
          
Base - .........................................................................................................................................

Fine adjustment knob - ..............................................................................................................

Coarse adjustment knob - ..........................................................................................................

4) write 2 parts of the microscope made of convex lenses. 

...........................................................                              .........................................................

5. What are the magnification powers of the eye piece ?

 .........................................      .............................................          .............................................

6. Defined what is resolution. 

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7. The first microscope was made by , 

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MADE BY THISENI WEERASINGHE