# What Do You Know About Archimedesâ€™ Principle And Buoyancy? Trivia Quiz

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What do you know about Archimedes’ principle and buoyancy? The principle states that the amount of fluid displaced when an object is placed in a fluid is equal to its weight. Do take up the quiz below and get to see if you know about the principle from your classes. Be sure to give each question the same amount of time.

• 1.

### The weight of a stone in air s 0.95N. When it is completely submerged in water, its weight is 0.48N. What is the buoyant force acting on the rock when it is completely submerged in the water?

• A.

1.43 N

• B.

0.47 N

• C.

-1.43 N

• D.

-0.47 N

B. 0.47 N
Explanation
When an object is submerged in a fluid, it experiences a buoyant force that is equal to the weight of the fluid displaced by the object. In this case, the weight of the stone in air is 0.95N, but when it is submerged in water, its weight decreases to 0.48N. The difference between these two weights is equal to the buoyant force acting on the stone, which is 0.47N. Therefore, the correct answer is 0.47N.

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• 2.

### Which are the following is FALSE about Archimedes' Principle?

• A.

A body at rest in a fluid is acted upon by a force pushing upward called the buoyant force, which is equal to the weight of the fluid that the body displaces.

• B.

If the body is completely submerged, the volume of fluid displaced is equal to the volume of the body.

• C.

If the body is only partially submerged, the volume of the fluid displaced is equal to the volume of the part of the body that is submerged.

• D.

The buoyant force is not equal to the weight of the fluid displaced and the buoyant force cannot be calculated.

D. The buoyant force is not equal to the weight of the fluid displaced and the buoyant force cannot be calculated.
Explanation
The statement that the buoyant force is not equal to the weight of the fluid displaced and the buoyant force cannot be calculated is false. According to Archimedes' principle, the buoyant force is equal to the weight of the fluid that the body displaces. This principle states that a body at rest in a fluid experiences an upward force called the buoyant force, which is equal to the weight of the fluid displaced. Therefore, the correct answer is that the statement is false.

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• 3.

### Name a force that acting on K

• A.

Electromagnetic Force

• B.

Buoyant Force

• C.

Nuclear Force

• D.

No forces acting on K

B. Buoyant Force
Explanation
Buoyant force is the correct answer because it is the force that acts on an object submerged in a fluid, such as water or air. This force is exerted in an upward direction and is equal to the weight of the fluid displaced by the object. In the given options, electromagnetic force and nuclear force do not apply to the context of an object in a fluid. The option "No forces acting on K" is incorrect as there is always at least one force acting on an object.

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• 4.

### These are the applications of Archimedes' Principle EXCEPT

• A.

Thermometer

• B.

Hydrometer

• C.

Submarine

• D.

Hot-air Ballon

A. Thermometer
Explanation
Archimedes' principle states that an object immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced by the object. Based on this principle, submarines are able to float and control their depth by adjusting their buoyancy. Hot-air balloons also utilize this principle to float in the air. Hydrometers are used to measure the specific gravity of liquids, which is related to buoyancy. However, thermometers do not rely on Archimedes' principle for their functioning. They measure temperature using different mechanisms, such as the expansion of a liquid or gas.

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• 5.

### Why do you think an iceberg can float on the sea?

• A.

Weight of the iceberg > the weight of sea water displaced

• B.

Weight of the iceberg < the weight of sea water displaced

• C.

Weight of the iceberg = the weight of the sea water displaced

• D.

Weight of the iceberg = the weight of the air surrounding the iceberg

C. Weight of the iceberg = the weight of the sea water displaced
Explanation
An iceberg can float on the sea because the weight of the iceberg is equal to the weight of the sea water displaced. This is due to Archimedes' principle, which states that an object will float if it displaces a weight of fluid equal to its own weight. In the case of an iceberg, the ice is less dense than the sea water, so it displaces a greater volume of water than its own volume, resulting in buoyancy.

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• 6.

### What is the buoyant force on a block of copper with a volume of 0.0456m3 submerged in a tank of water? Given that the density of water is 1.0 x 103 kg/m3 and g = 10.0 m/s2

• A.

546 N

• B.

456 N

• C.

645 N

• D.

Question is not relevant

B. 456 N
Explanation
The buoyant force on an object submerged in a fluid is equal to the weight of the fluid displaced by the object. In this case, the block of copper is submerged in water, so the buoyant force is equal to the weight of the water with the same volume as the copper block. The density of water is given as 1.0 x 10^3 kg/m^3, so the mass of the water is equal to its density times its volume, which is 1.0 x 10^3 kg/m^3 * 0.0456 m^3 = 45.6 kg. The weight of the water is then equal to the mass times the acceleration due to gravity, which is 45.6 kg * 10.0 m/s^2 = 456 N. Therefore, the buoyant force on the copper block is 456 N.

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