Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 chapter 4 - Pressure in Fluids [Latest edition]

Chapter 4: Pressure in Fluids

Practice Problems 1Practice Problems 2Practice Problems 3Practice Problems 4Practice Problems 5Multiple Choice QuestionsSubjective Questions
Practice Problems 1

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

Practice Problems 1 | Q 1

Calculate the pressure exerted by 0.8 m vertical length of alcohol of density 0.80 gcnr5 in SI units.
[Take g = 10 ms−2].

Practice Problems 1 | Q 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].

Practice Problems 2

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

Practice Problems 2 | Q 1

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.

Practice Problems 2 | Q 2

What vertical height of water will exert a pressure of 333200 Pa? The density of water is 1000 kgnr3 and g = 9.8 ms−2.

Practice Problems 2 | Q 3

Pressure at the bottom of the sea at some particular place is 8968960 Pa. If the density of seawater is 1040 kgm3 calculate the depth of the sea. Take g = 9.8 ms−2. Neglect the pressure of the atmosphere.

Practice Problems 3

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

Practice Problems 3 | Q 1

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?

Practice Problems 3 | Q 2

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.

Practice Problems 4

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

Practice Problems 4 | Q 1

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.

Practice Problems 4 | Q 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.

Practice Problems 5

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

Practice Problems 5 | Q 1.1

The area of cross-sections of the pump plunger and press plunger of a hydraulic press is 0.02 m2 and 8 m2 respectively. If the hydraulic press overcomes a load of 800 kgf, calculate the force acting on the pump plunger.

Practice Problems 5 | Q 1.2

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.

Practice Problems 5 | Q 2

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.

Multiple Choice Questions

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

Multiple Choice Questions | Q 1

Select the correct option.

Unit of thrust in the SI system is

• dynes

• joule

• N/m2

• newton

Multiple Choice Questions | Q 2

Select the correct option.

The unit Nmis the unit of

• force

• pressure

• thrust

• momentum

Multiple Choice Questions | Q 3

Select the correct option.

One Pascal is equal to

• Nm1

• Nm−2

• Nm2

• Nm−1

Multiple Choice Questions | Q 4

Select the correct option.

Thrust acting perpendicularly on the unit surface area is called

• pressure

• moment of force

• down thrust

• none of these

Multiple Choice Questions | Q 5

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

Multiple Choice Questions | Q 6

Select the correct option.

As we move upwards, the atmospheric pressure

• increases

• decreases

• remains same

• cannot be said

Multiple Choice Questions | Q 7

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’

Multiple Choice Questions | Q 8

Select the correct option.

The pressure exerted by 50 kg (g = 10 m/s−2) on an area of cross-section of 2 m2 is

• 50 Pa

• 200 Pa

• 250 Pa

• 1000 Pa

Multiple Choice Questions | Q 9

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

Multiple Choice Questions | Q 10

Select the correct option.

The atmospheric pressure on the earth’s surface is approximately

• 105 Pa

• 104 Pa

• 9.6 × 104 N/m2

• 10−4 Pa

Subjective Questions

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

Subjective Questions | Q 1

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

Subjective Questions | Q 2

The normal pressure of air is 76 cm of mercury. Calculate the pressure in SI units.
[Density of mercury = 13600 kg/m3 and g = 10 m/s2]

Subjective Questions | Q 3

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/m3; Density of water = 1000 kg/m3)

Subjective Questions | Q 4

The base of the cylindrical vessel measures 300 cm2. Water is poured into it up to a depth of 6 cm. Calculate the pressure of water on the base in the vessel.

Subjective Questions | Q 5

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)

Subjective Questions | Q 6.1

Define the SI unit of pressure.

Subjective Questions | Q 6.2

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

Subjective Questions | Q 7

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]

Subjective Questions | Q 8

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

Subjective Questions | Q 9

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

1. What is the pressure on the free surface of the liquid?
2. What is the pressure on the base of the beaker?
3. What is the lateral pressure at the base on the inner walls of the beaker?
Subjective Questions | Q 10

State Pascal's law of transmission of pressure.

Subjective Questions | Q 11

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.

Subjective Questions | Q 12

State Pascal's law of transmission of pressure.

Subjective Questions | Q 13

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

Subjective Questions | Q 14

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 × 103 kgm−3 and the value of ‘g’ as 10 ms−2]

Subjective Questions | Q 15

State two advantages of an aneroid barometer.

Subjective Questions | Q 16

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

Practice Problems 1Practice Problems 2Practice Problems 3Practice Problems 4Practice Problems 5Multiple Choice QuestionsSubjective Questions

Goyal Brothers Prakashan solutions for Class 9 A New Approach to ICSE Physics Part 1 chapter 4 - Pressure in Fluids

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Concepts covered in Class 9 A New Approach to ICSE Physics Part 1 chapter 4 Pressure in Fluids are .

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