6. Which type of instrument would best be used to look at a
grain of wheat pollen.
a) optical microscope
b) radio telescope
c) transmission electron microscope
d) scanning electron microscope
e) variable electron microscope
14) Rutherford’s alpha particle -scattering experiment showed
that most alpha particles directed toward a thin metallic foil
passed through with only slight deviations. From this evidence we
can conclude that.....
18. Two stars star A and star B are the same size. The
temperature of...
What type of directional valve is used to control the
forward and reverse of a double-acting hydraulic piston?
a) 3 way/ 2 position
b) 4 way/ 2 position
c) 4 way/ 3 position
and why?