Buoyancy

Q.

State the principle of floatation.

Q.

A piece of wood floats on water.

1. True
2. False

Q. An object floats if the buoyant force exerted on it by the fluid is greater than its weight. State true or false.

1. False.
2. True.

Q. If the substance's density is larger than water, it will .

1. float
2. fall
3. sink

Q.

A piece of wood is held underwater. The upthrust on it is:

1. equal to the weight of the wood

2. less than the weight of the wood

3. more than the weight of wood

4. zero

Q.

Name the factors on which the buoyant force depends.

Q.

What is buoyancy and buoyant force? On what factors do they depend?

Q.

When does the buoyant force become maximum and remain constant?

Q.

When buoyant force is greater or equal to its weight, then an object floats over a liquid.

1. True
2. False

Q.

A stone sinks in water, because the weight of water displaced by it is:

1. Equal to the weight of the stone

2. More than the weight of the stone

3. Less than the weight of the stone

4. None of the above

Q.

State the principle of flotation.

Q.

Buoyancy is equal in magnitude to the weight of the ____liquid

Q.

What do you understand by the term buoyant force?

Q.

State the principle of floatation.

Q.

State any two factors which determine buoyant force acting on a body.

Q.

Why does a needle made of iron sink in water but a hollow ship made of iron float on water, though the ship is much heavier than the needle?

Q.

State the law of floatation?

Q. Oil floats on water.

1. True
2. False

Q. How can a relatively denser object be made to float on a less dense fluid?

1. By altering the shape.
2. By altering the shear forces acting on the object
3. By altering the forces acting on the object.
4. None of the above.

Q. How can a relatively denser object be made to float on a less dense fluid?

1. By altering the shape
2. By altering the forces acting on the object
3. By altering the shear forces acting on the object
4. None of the above

Q. Which of the following things will float on water?

1. Ship
2. Wood Log
3. Ice
4. Iron nail
5. Stones
6. Oil
7. Coin
8. Thermocol

Q.

Which among the following will float on water?

1. Needle
2. Iron nail
3. Oil
4. Stone

Q. Which of the following substance will float in water?

1. Coin
2. Coloured pebbles
3. Steel spoon
4. Plastic ball

Q.

When the weight of a body is more than buoyant force the body:

1. Floats

2. Just floats

3. Sinks

4. None of these

Q.

A ship made of iron floats.

1. True
2. False

Q.

Why iron nail sinks where as ship foat on water

Q. Name two materials which float on water.

Q.

how does ships float even when metal sinks in water?

Q.

Archimedes is reported to have shouted “_____________”, when the idea of the buoyant force first struck him while taking a bath.

Q. Which one of the following will sink in water?
(a) wood
(b) plastic mug
(c) knife
(d) dry leaves