Nanotechnology

The opposite figure represents 4 substances have the same total mass, when each of them is dissolved in water separately, it is found that (W) dissolves with the lowest rate. The reason is                             

• its volume is larger     

• its surface area is smaller                                                                    

• its number of particles is higher

• its density is lower

To be described as a nanoparticle this particle should                              

• be unidimensional                

• has length and width which are measured in nanoscale

• has length, width and height        

• has at least one nano dimension

What are the possible dimensions for the opposite figure

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903.3 nm = ……….ϻm                                                                                   

• 90.33 x 10^-3       

• 9.033 x 10^-3

• 903.3 x10 ^-9

• 9.033 x 10^-1

Egypt depends on the river Nile for drinking water, what is the suitable nanosubstance that can be used for water filtration                  

• Nano fibers

• Nano tubes

• Bucky ball

• Nano robot