New Books 6th standard Science : Matter Around Us Model Test - 3

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1.  In washing machines this principle is used to squeeze out dirt from clothes and the method is called ________.
   1.  Winnowing
   2.  Decantation
   3.  Tunneling
   4.  Centrifugation
   
   
2. Matter is anything that has ________.
   1.  mass
   2.  occupies space
   3.  both (a) & (b)
   4.  plasma
   
   
3. Silicon atoms on a surface can be seen via ______.
   1.  Scanning Electron Microscope
   2.  Scanning Tunneling Microscopy
   3.  Tunnelling Electron Microscope
   4.  Electron Microscope
   
   
4. Bose – Einstein condensate is a gas – like state of matter that exists at extremely cold temperatures. It was predicted around 1925 and confirmed in ________.
   1.  1991
   2.  1990
   3.  1992
   4.  1995
   
   
5. _________is the tendency of particles to spread out in order to occupy the available space.
   1.  Absorption
   2.  Permeable
   3.  Osmosis
   4.  Diffusion
   
   
6. The force of attraction between liquid particles is ______ than solid particles
   1.  depends on the quantities under gravity
   2.  more
   3.  less
   4.  equals
   
   
7. When and why do we need to separate mixtures?
   1.  when a substance has to be obtained in highly pure form
   2.  when the useful component has to be separated from other components
   3.  when we need to remove impurities or harmful components from the mixtures 
   4.  All of the above
   
   
8. 22 carat gold which is composed of _________.
   1.  gold and copper
   2.  gold and cadmium
   3.  gold and aluminium
   4.  both (a) & (b)
   
   
9. Sieving is used when we have to separate _________.
   1.  solid particles from liquid
   2.  solid particles of same sizes
   3.  solid particles of different sizes
   4.  liquid particles of same colour
   
   
10. When very fine insoluble solids have to be separated from a liquid as in butter from curds,___________ is performed
    1.  decantation
    2.  fermentation
    3.  squeezing
    4.  churning
    
    



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