Floating and Sinking

Q.

Difference between buoyant force and thrust .

Q. The volume of $50g$ of a substance is $20c{m}^3$. If the density of water is $1gc{m}^{-3}$, will the substance float or sink?

1. The substance will neither sink nor float.
2. The substance will float.
3. It can’t be determined.
4. The substance will sink.

Q. A uniform rod of density p is placed in a wide tank, containing a liquid of density po(po>p).the depth of liquid in the tank is half the length of the rod.the rod is in equilibrium with its half the length of the rod with its lower end resting on the bottom of the tank.in this position the rod makes and angle thetha with horizontal, find it.

Q.

What are the advantages of pressure?

Q.

A ball of relative density $0.8$ fall into water from a height of $2$m. The depth to which the ball will sink is

1. $8m$

2. $2m$

3. $6m$

4. $4m$

Q. At 27^°C , the osmotic pressure of a non- volatile , non-electrolyte solute is 47.7 mm hg.The soln is dil and heated upto 127^°C, when the osm pressured comes 19 mm Hg.Then Molality of soln becomes? Extent of dilution is?

Q.

If the density of an object is greater than the density of the liquid, the object will _____.

Q.

Name the force exerted in the upward direction by a liquid when a body is immersed in it.

Q.

A glass filled with water up to its brim contains some amount of ice. When the ice melts, the water does not overflow. Explain.

Q.

A cylindrical vessel containing a liquid is rotated about its axis so that the liquid rises at its sides as shown in the figure. The radius of vessel is $5cm$ and the angular speed of rotation is $\omega rad{s}^{-1}$. The difference in the height, $h$ (in $cm$) of liquid at the center of the vessel and at the side will be:

1. $\frac{5{\omega }^2}{2g}$

2. $\frac{2{\omega }^2}{25g}$

3. $\frac{25{\omega }^2}{2g}$

4. $\frac{2{\omega }^2}{5g}$

Q. A massless inextensible string in the form of a loop is placed on a horizontal film of soap solution of surface tension T.If film is pierced inside the loop and it convert into a circular loop of diameter d, then the tension produced in the string is (1)Td (2)Td (3)dT (4)dT/4

Q.

The given figure shows ice cubes whose relative density is less than $1$. What will happen if the ice cubes are dropped in water? ​

1. They will sink inside water.
2. They may either sink or float.
3. They will float on water.
4. Can’t say.

Q.

What happens when ship enters sea from river?

Q.

Floating and sinking of an object depends on:

1. density of object and fluid

2. mass of the fluid and the object

3. volume of the fluidand the object

4. density of fluid only

Q. Derive excess pressure inside a soap bubble expression with charge density p and radius r

Q.

The volume of 100g of a substance is $20c{m}^3$. If the density of water is 1 $gc{m}^{-3}$, the substance will sink in it.

1. The substance will sink.
2. The substance will float.

Q.

A body of density d floats half immersed in a liquid. Will a body of same dimension but density 2d float in it?

Q.

Is the buoyant force equal in all liquids? Why and how?

Q. What is metacentre?

Q.

An ice cube holding an iron nail in it is floating on water when it melts the water level Rises.

1. True
2. False

Q.

Discuss the three possible cases for floating of objects in a liquid.

Q.

what is law of floatation how it is used in submarines

Q.

A body while floating sinks deeper in a liquid of low density than in a liquid of high density

1. Density of fluid A > Density of fluid B

2. Density of fluid A = Density of fluid B

Q.

A body has a weight 50 N in air. After immersing completely in liquid it's weight is 20 N. Then the buoyant force on the body will be

Q.

The upward force exerted by a liquid on an object immersed in it is called ________________

Q.

Which force makes a body to float in a liquid ?

1. Density

2. Pressure

3. Can’t be defined

4. Buoyancy

Q.

A piece of stone weighing 200 g when immersed in water taken in a Eureka can displaces 20 mL of water. Find the density of the stone in kg/cu m.

1. 2000 kg/cu m

2. 1000 kg/cu m

3. 10000 kg/cu m
4. 20000 kg/cu m

Q.

Please tell me what is buoyant force .

Q.

A body when immersed in kerosene it sinks. What relation could be established between the densities of body and kerosene?

1. Density of kerosene > Density of body

2. Density of kerosene < Density of body

3. None of these

4. Density of kerosene = Density of body

Q.

A solid will sink in a liquid if its density is ________ than the density of the liquid.