- 1. An object that floats in water has a density
A) equal to the density of water
B) greater than the density of water
C) less than the density of water
- 2. Water pressure is least against the
A) bottom of a submerged object
B) top of a submerged object
C) none of these (same against all surfaces)
D) sides of a submerged object
- 3. Lobsters live on the bottom of the ocean. Therefore, the density of a lobster is
A) greater than the density of sea water
B) less than the density of sea water
C) equal to the density of sea water
- 4. The weight of water displaced by a 100-ton floating ship is
A) 80 tons
B) 100 tons
C) 120 tons
- 5. A styrofoam boat 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
A) 4 cm
B) 6 cm
C) 5 cm
D) 10 cm
- 6. If the weight density of a liquid is 4N / cm3 , and a submerged block of metal displaces 20 cm3 of liquid, the buoyant force on the block of metal is
- 7. Surface tension is due to cohesive forces between molecules in the liquid.
A) false
B) true
- 8. A car lift at a service station makes use of the flotation principle.
A) false
B) true
- 9. 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
- 10. Compared to the density of water, the density of a dead fish floating on top of the water is
A) the same
B) less
C) more
- 11. The density of a submerged submarine is the same as the density of the same submarine when it is floating.
A) true
B) false
|