1) What is buoyancy? a) Buoyancy is the upward force exerted by the fluid that opposes the weight of the partially or fully immersed object. b) Buoyancy is the downward force exerted by the object that opposes the weight of the displaced amount of fluid. c) Buoyancy is the process in which an object floats  d) Buoyancy is the process in which an object sinks. 2)  Images 1, 2 and 3 show the three types of buoyancy. Which one (s) show (s) neutral buoyancy? a) 3 b) 1 c) 2 d) 1 and 3 3) What property is used to determine the mass of an object that floats on water. a) Triple beam balance b) Beam balance. c) Mass of the portion of the object above the fluid. d) Mass of the displaced fluid which is equal to the mass of the floating object. 4) Which one of the three submarines in the diagram above displaced an amount of water having a weight less than that of an object?? a) 2 b) 3 c) 1 and 3 d) 2 and 3 5) Why is the sinker needed in determining the volume of an irregular solid that floats on water? a) Because it helps the floating object to float more. b) Because sinker gives the volume of the floating object. c) Because it enables the floating object to be completely submerged so that it displaces an amount of water equal to its volume. d) Because the sinker makes density of a floating material constant. 6) The volume of water displaced by sinker is 30cm3 while that displaced by a wooden  block tied to sinker is 60cm3. Find the volume of the wooden ball.  a) 30cm3 b) 90cm3 c) 110cm3 d) 150cm3 7) A floating object displaces an amount of water having a mas of 200g. When sinker is lowered in measuring cylinder initially containing 150cm3 of water, the level rises to 200cm3, but If floating object is made to be completely submerged by means of a sinker, the level of water rises to 500cm3.  Find the density of this object.  a) 0.12g/cm3 b) 0.28g/cm3 c) 0.50g/cm3 d) 0.67g/cm3 8) The density of iron is 7.9g/cm3 while that of water is 1.00g/cm3. Why would a ship that is made up of iron float in water? a) Because a ship is made up of lighter material. b) Because a ship displace an amount of water having mass more than it's mass. c) Because a ship has lower density than that of water. d) Because a ship is fitted with water floaters under the base. 9) There are three reasons why an object will float on water and these are... a) object is less dense, is lighter and is fitted with floaters. b) object weighs less, is less dense and its weight is spread out. c) object weighs less, is fitted with floaters and is less dense. d) object is less dense, is fitted with floaters and made up of lighter material. 10) When is the object said to have neutral buoyancy? a) When the upward force exerted by the fluid on the object is greater or equal to the weight of the object. b) When upward force exerted by the fluid on the object is more than the weight of the floating object. c) When upward force exerted by the fluid on the object is less than the weight of the submerged object. d) When upward force exerted by the fluid on the object is equal to the weight of the suspended object.

1.Density - Determine the density of floating objects

Drukuj
Osadź

Tabela rankingowa

Motyw

Opcje

Zmień szablon

Przywrócić automatycznie zapisane ćwiczenie: ?