Liquid Pressure

Q.

What is density bottle? How is it used to find the density of a liquid?

Q.

How will you determine the density of an irregular solid

Q.

Calculate the pressure at a depth of 50m below the surface of the sea. The density of sea water is 1024 $\frac{kg}{m^3}$.

__

Q.

What is the formula of capillarity?

Q.

Why do we define density as mass per unit volume.

Q.

What is the density of water in SI units?

Q.

On which factor pressure exerted by water at the bottom of the container depends? Explain by an example.

Q.

An empty density bottle weighs 30 g. When completely filled with water, it weighs 55 g and when completely filled with brine solution it weighs 55.5 g. Calculate:

• Volume of the density bottle

• Density of brine solution.

Q.

A container weighs 50 g when empty, 120 g when filled with water and 113 g when filled with an oil. Find the density of the oil.

Q.

Pressure at the same level in a water tank is

1. Equal in all directions

2. Unequal in all directions

3. Same at every level

4. None of these

Q.

What happens to the pressure with increase in depth. It increases or decreases? Why?

Q.

The density of a substance depends only on its____________.

Q.

Give reasons:-

a) a one centimetre cube block of wood weighs lesser than a one centimetre cube block of iron

Q.

A density bottle weighs 20.25g when empty, 40.75g when filled with a liquid and 50.25g when filled with water. Find (a) Volume of the bottle ; (b) Density of the liquid.

Q.

The pressure exerted by a liquid at depth $h$ is ____.
(All terms have their standard meanings)

1. $h\rho g-P_{\circ }$
2. $h\rho g$
3. $P_{\circ }+h\rho g$
4. $P_{\circ }$

Q. It is given that both liquid A and liquid B exert the same amount of pressure on their respective bases. The density of liquid A is twice the density of liquid B. The height of the column of liquid B is $10cm$. What would be the height of the column of liquid A?

1. $5cm$
2. $15cm$
3. $20cm$
4. $10cm$

Q.

A container is filled with liquid up to $20cm$. The pressure at the bottom of the liquid column is $10Pa$. Find the density of the liquid.

GIven: Acceleration due to gravity, g = $10m/s^2$.

1. $0.5kg/m^3$

2. $5kg/m^3$

3. $1kg/m^3$

4. $2kg/m^3$

Q. A raft of wood (density $600kg/m^3$) of mass $120kg$ floats in water. The weight that can be put on the raft to make it just sink is :

1. $120kg$
2. $200kg$
3. $40kg$
4. $80kg$

Q.

Why are sea-divers and astronauts made to wear special suits?

Q.

Calculate the pressure at a depth of $50m$ below the surface of the sea. The density of sea water is $1024kg/m^3$.

( Accelaration due to gravity = $10m/s^2$)

1. 512000 Pa

2. 51200 Pa

3. None of these

4. 5120 Pa

Q.

1)what is drag and give any 4 examples

2)define ball bearing 2 examples

Q. State the reason behind the gradual wearing out of tyres in a vehicle. Explain.

Q.

Water and oil are taken in two separate beakers, the density of water is $1000kg/m^3$ and the density of oil is $1500kg/m^3$. At what depth, the pressure in oil beaker will be the same as the pressure at $150cm$ in the water beaker? (Acceleration due to gravity = $10m/s^2$)

1. $150cm$

2. $50cm$

3. $75cm$

4. $100cm$

Q. Choose the correct statement about drag in fluids.

1. It doesn't depend on the shape of the object.
2. It exists in solids, liquids and gases.
3. Different objects may experience different drag in fluids.
4. It exists only in liquids.

Q. It is always easier to move a cart wheels because they friction.

1. with
2. without
3. increase
4. reduce

Q. An ice-berg floating partly immersed in sea water of density $1.03g/c{m}^3$. The density of ice is $0.92g/c{m}^3$. The fraction of the total volume of the iceberg above the level of sea water is

1. $11\%$
2. $8.1\%$
3. $0.8\%$
4. $34\%$

Q. If we have two liquids having the density D1 and D2 such that one is greater than the true if the mass of the liquid m1 and m2 then m1 is greater than m 2 if the volume is same but what if m2 has greater volume then and which will bigger m1 or m2?

Q. Which of the following reduces friction?

1. Washing away lubricants from ball bearings
2. Making the surface rougher
3. Applying more pressure on the surface
4. Streamlining the design of cars, aeroplanes and rockets

Q.

What length of water column is equivalent to $0.86m$ of mercury column?

Given: density of mercury is $13.6$ times the density of water.

1. $11.423m$

2. $11.696m$

3. $10.696m$

4. $12.696m$

Q. Calculate the pressure at a depth of $60\text{m}$ under the sea in $\text{kPa}$, if the density of seawater is $1,025{\text{kg m}}^{-3}$.
($1\text{kPa}=1000\text{Pa}$ and $\text{g}=10{\text{m s}}^{-2}$)

1. 615