#### Chapters

Chapter 2: Motion in One Dimension

Chapter 3: Laws of Motion

Chapter 4: Pressure in Fluids

Chapter 5: Upthrust and Archimedes’ Principle

Chapter 6: Heat and Energy

Chapter 7: Energy Flow and Practices for Conservation of Resources

Chapter 8: Light

Chapter 9: Sound

Chapter 10: Electricity and Magnetism – 1

Chapter 11: Electricity and Magnetism – 2

## Chapter 4: Pressure in Fluids

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 4 Pressure in Fluids Practice Problems 1

Calculate the pressure exerted by 0.8 m vertical length of alcohol of density 0.80 gcnr^{5} in SI units.

[Take g = 10 ms^{−2}].

What is the pressure exerted by 75 cm vertical column of mercury of density 13600 kgm^{−3} in SI units?

[Take g = 9.8 ms^{−2}].

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 4 Pressure in Fluids Practice Problems 2

66640 Pa pressure is exerted by 0.50 m vertical column of a liquid. If g = 9.8 Nkg^{−1}, calculate the density of the liquid.

What vertical height of water will exert a pressure of 333200 Pa? The density of water is 1000 kgnr^{3} and g = 9.8 ms^{−2}.

Pressure at the bottom of the sea at some particular place is 8968960 Pa. If the density of seawater is 1040 kgm^{3} calculate the depth of the sea. Take g = 9.8 ms^{−2}. Neglect the pressure of the atmosphere.

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 4 Pressure in Fluids Practice Problems 3

Atmospheric pressure at sea level is 76 cm of mercury. Calculate the vertical height of the air column exerting the above pressure. Assume the density of air 1.29 kgm^{−3 }and that of mercury is 13600 kgm^{−3}. Why the height calculated by you is far less than the actual height of the atmosphere?

Calculate the equivalent height of mercury, which will exert as much pressure as 960 m of seawater of density 1040 kgm^{−3}. The density of mercury is 13600 kgm^{−3}.

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 4 Pressure in Fluids Practice Problems 4

The pressure of water on the ground floor, in a water pipe is 150000 Pa, whereas pressure on the fourth floor is 30000 Pa. Calculate the height of the fourth floor. Take g = 10 ms^{−2}.

The pressure of water on the ground floor is 160000 Pa. Calculate the pressure on the fifth floor, at a height of 15 m.

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 4 Pressure in Fluids Practice Problems 5

The area of cross-sections of the pump plunger and press plunger of a hydraulic press is 0.02 m^{2} and 8 m^{2} respectively. If the hydraulic press overcomes a load of 800 kgf, calculate the force acting on the pump plunger.

If the mechanical advantage of the handle of the pump plunger is 8, calculate the force applied at the end of the handle of the pump plunger.

The radius of the press plunger and pump plunger are in ratio of 50 : 4. If an effort of 20 kgf acts on the pump plunger, calculate the maximum effort which the press plunger can over come.

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 4 Pressure in Fluids Multiple Choice Questions

**Select the correct option.**

Unit of thrust in the SI system is

dynes

joule

N/m

^{2}newton

**Select the correct option.**

The unit Nm^{2 }is the unit of

force

pressure

thrust

momentum

**Select the correct option.**

One Pascal is equal to

Nm1

Nm

^{−2}Nm

^{2}Nm

^{−1}

**Select the correct option.**

Thrust acting perpendicularly on the unit surface area is called

pressure

moment of force

down thrust

none of these

**Select the correct option.**

Pressure applied in liquids is transmitted with undiminished force

in downward direction

upward direction only

sides of containing vessel

in all directions

**Select the correct option.**

As we move upwards, the atmospheric pressure

increases

decreases

remains same

cannot be said

**Select the correct option.**

A dam for water reservoir is built thicker at the bottom than at the top because

pressure of water is very large at the bottom due to its large depth

water is likely to have more density at the bottom due to its large depth

quantity of water at the bottom is large

variation in value of ‘g’

**Select the correct option.**

The pressure exerted by 50 kg (g = 10 m/s^{−2}) on an area of cross-section of 2 m^{2} is

50 Pa

200 Pa

250 Pa

1000 Pa

**Select the correct option.**

Pressure at a point inside a liquid does not depend on

The depth of the point below the surface of the liquid

The nature of the liquid

The acceleration due to gravity at that point

The shape of the containing vessel

**Select the correct option.**

The atmospheric pressure on the earth’s surface is approximately

10

^{5}Pa10

^{4}Pa9.6 × 10

^{4}N/m^{2}10

^{−4}Pa

### Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 Chapter 4 Pressure in Fluids Subjective Questions

State three factors on which the pressure at a point in a liquid depends.

The normal pressure of air is 76 cm of mercury. Calculate the pressure in SI units.

[Density of mercury = 13600 kg/m^{3} and g = 10 m/s^{2}]

At a given place, a barometer records 70 cm of Hg. If the mercury in the barometer is replaced by water, what would be resulting in reading? (Density of Hg = 13600 kg/m^{3}; Density of water = 1000 kg/m^{3})

The base of the cylindrical vessel measures 300 cm^{2}. Water is poured into it up to a depth of 6 cm. Calculate the pressure of water on the base in the vessel.

The pressure in the water pipe on the ground floor of a building is 40000 pascals, whereas on the first floor it’s 10000 pascals. Find the height of the first floor. (Acceleration due to gravity g = 10 ms^{−2})

Define the SI unit of pressure.

The atmospheric pressure at a place is 650 mm of Hg. Calculate this pressure in Pascals (Pa).

Pressure in a water pipe on the ground floor of a building is 100,000 Pa. Calculate the pressure in the water pipe on the first floor at a height of 3 m. [Density of water = 1000 kgm^{−3} ; g = 10 ms^{−2}]

P is the pressure at some point in a liquid. State whether pressure P is a scalar or vector quantity.

**A beaker contains a liquid of density ‘ρ’ up to height ‘h’ such that ‘P _{A}’ is atmospheric pressure and ‘g’ is the acceleration due to gravity. Answer the following questions:**

- What is the pressure on the free surface of the liquid?
- What is the pressure on the base of the beaker?
- What is the lateral pressure at the base on the inner walls of the beaker?

State Pascal's law of transmission of pressure.

Calculate the hydrostatic pressure exerted by water at the bottom of a beaker. Take the depth of water as 40 cm, the density of water 1000 kgm^{−3 }and g = 9.8 ms^{−2}.

State Pascal's law of transmission of pressure.

State briefly, how and why the atmospheric pressure of a place varies with the altitude. Draw an approximate graph to illustrate this variation.

The blood pressure reading of a patient is recorded 160/100. Express the lower pressure in SI units.

[Take density of mercury as 13.6 × 10^{3} kgm^{−3} and the value of ‘g’ as 10 ms^{−2}]

State two advantages of an aneroid barometer.

Explain why a gas bubble released at the bottom of a lake grows in size as it rises to the surface of the lake.

## Chapter 4: Pressure in Fluids

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