Buoyancy

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. 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. Buoyant force is an upward force that is equal to the weight of the fluid it __.

1. displaces
2. generates
3. overcomes
4. holds

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. Oil floats on water.

1. True
2. False

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

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

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

1. float
2. fall
3. sink

Q.

A block of wood floats on water with 1/4 th of its volume above the water surface. The density of the wooden block will be?

Take, density of water = 1 $gc{m}^{-3}$.

1. 0.25 $gc{m}^{-3}$

2. 0.50 $gc{m}^{-3}$

3. 0.75 $gc{m}^{-3}$

4. 1 $gc{m}^{-3}$

Q.

The weight of a body ________ when it is submerged in a liquid.

1. doubles

2. remains the same

3. decreases

4. increases