Volume of Spheres (Grade 8)

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Volume of Spheres

1. 
What is the formula for the volume of a sphere?
  1. [math]V = l xx w xx h[/math]
  2. [math]V = 1/3pir^2h[/math]
  3. [math]V=pir^2h[/math]
  4. [math]V=4/3pir^3[/math]
2. 
Find the volume of a sphere with a radius of 20 mm. Use 3.14 for pi.
  1. 251.2 cubic millimeters
  2. 125.6 cubic millimeters
  3. 100,480 cubic millimeters
  4. 33,493.33 cubic millimeters
3. 
The diameter of the earth is about 7,918 miles. Which of the following is the best estimate of the earth's volume?
  1. [math]5.0 xx 10^4[/math] cubic miles
  2. [math]10.0 xx 10^4[/math] cubic miles
  3. [math]2.6 xx 10^11[/math] cubic miles
  4. [math]2.1 xx 10^12[/math] cubic miles
4. 
A spherical water tower has a diameter of 15 meters and is filled completely with water. How much water is in the tank?
  1. [math]14137 m^3[/math]
  2. [math]1767 m^3[/math]
  3. [math]994 m^3[/math]
  4. [math]563 m^3[/math]
5. 
Find the volume of the sphere with a diameter of 8.




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