1. An object that floats in water has a density
   
   
   1. less than the density of water
   2. equal to the density of water
   3. greater than the density of water
   4. na
   
   
   
2. Water pressure is least against the
   
   
   1. top of a submerged object
   2. bottom of a submerged object
   3. sides of a submerged object
   4. same against all surfaces
   
   
   
3. Lobsters live on the bottom of the ocean, therefore, the density of a lobster is
   
   
   1. less than the density of sea water
   2. equal to the density of sea water
   3. greater than the density of sea water
   4. na
   
   
   
4. When you float in fresh water, the buoyant force that acts on you is equal to your weight. When you float higher in the higher density of the ocean water, the buoyant force that acts on you is actually
   
   
   1. greater than your weight
   2. less than your weight
   3. equal to your weight
   4. na
   
   
   
5. Capillary action is mainly the result of
   
   
   1. Archimedes' principle
   2. Bernoulli's principle
   3. cohesive forces
   4. adhesive forces

PART  II      Fill  in  Blanks

6. How much pressure does a person weighing  6000 N exert on the floor if his/her shoes have a total bottom surface area of  300 cm² ?    ________ N/cm²
   
   
7. The weight of water displaced by a  100-ton floating ship is   ___________ tons
   
   
8. A styrofoam boat (assume mass = 0) loaded with  100 g. of wood floats in a swimming pool at a depth of  3 cm. When another  100 g. of wood is added to the boat, it will float at a depth of   ___________ cm.
   
   
9. If the weight density of a liquid is  4 N / cm³ and a submerged block of metal displaces  20 cm³ of liquid, the buoyant force on the block of metal is   ________ N
   
   
10. In the hydraulic arrangement below, the area of the smaller end is  10 cm² and the area of the larger end is  40 cm². If a force of  5 N is placed on the smaller (input) end, the larger (output) end could lift with a force of  ___________ N
    HINT : determine the pressure first
    
    

PART  III     True  or  False

11. Surface tension is due to cohesive forces between molecules in the liquid.
    
    
12. A car lift at a service station makes use of the flotation principle.
    
    
13. When an object having a weight of  8 N is placed in a liquid that exerts a buoyant force of   3 N on the object, the object's apparent weight in this liquid is  5 N.
    
    
14. Compared to the density of water, the density of a dead fish floating on top of the water is greater.
    
    
15. The density of a submerged submarine is the same as the density of the same submarine when it is floating.