CBSE Worksheet for chapter-7 Fluid class 9

Worksheet For class 9

Find CBSE Worksheet for chapter-7 Fluid class 9

CLASS-9

BOARD: CBSE

Physics Worksheet - 7

TOPIC: Fluid

For other CBSE Worksheet for class 9 Science check out main page of Physics Wallah.

SUMMARY

  • Fluids,Pressure in fluids, Thrust, Units of pressure
  • Buoyancy force, Factors affecting buoyant force
  • Archimedes principle, Relative density, Uses of Archimedes principle
  • Physical meaning of relative density, Law of floatation

SECTION I – OBJECTIVE

  1. If a force of 10 N acts perpendicularly on two surfaces (area in the ratio 1:2), then the ratio of thrust will be:
    1. 1:2
    2. 2:1
    3. 3:1
    4. 1:1
  2. A force of 50 N is applied normally on a nail of area 0.001 sq.cm. Then the thrust is:
    1. 50 N
    2. 100 N
    3. 0.05 N
    4. 10 N
  3. Pressure cannot be measured in:
    1. N/m2
    2. bar
    3. Pa
    4. kg.wt
  4. Pressure is:
    1. Scalar quantity.
    2. Normal force
    3. Vector quantity
    4. All the above are wrong
  5. The atmosphere exerts a pressure of P on the surface of the earth, then P equals to:
    1. 1.01x105 N/m2
    2. 1.01x10-5 N/m2
    3. 1.01x107 N/m2
    4. 1.01x10-7 N/m2
  6. Unit of relative density is:
    1. kg/m3
    2. g/m3
    3. g/litre
    4. Unit less
  7. A cylinder of wood floats vertically in water with one-fourth of its length out of water The density of wood is:
    1. 0.25 g/cm3
    2. 0.5 g/cm3
    3. 0.75 g/cm3
    4. 1 g/cm3
  8. Two solids X and Y float on water, X floats with half of its volume submerged while Y floats with one-third of its volume out of water. The densities of X and Y are in the ratio of:
    1. 4:3
    2. 3:4
    3. 2:3
    4. 1:3
  9. Archimedes principle is used to:
    1. Design ships
    2. Design Submarines
    3. Design Lactometers
    4. All of them
  10. As we move upwards, the atmospheric pressure:
    1. Increases
    2. Decreases
    3. Remains same
    4. cannot be said

SECTION II - SUBJECTIVE

  1. Explain following terms:
    1. Fluid
    2. Pressure in fluid
    3. Thrust
  2. State Archimedes principle.
  3. What is the pressure due to man weighing 80 kg, standing on his feet? Area of his feet= 160 sq cm.
  4. (g = 10 m/s2)
  5. What is height of mercury which exerts the same pressure as 20 cm of water column?
  6. Take density of mercury as 13.6 g/cc.
  7. When an aluminium object is immersed in water, it displaces 5 kg of water.
  8. How much is the buoyant force acting on the aluminium object in newtons? (g= 10 m/s2)
  9. The relative density of silver is 10.5. The density of water is 103 kg/m3. What is the density of silver in S.I. unit?
  10. A body of volume 300 cm3 and relative density 1/3 is placed in water. Will it sink or float in water and what will be the volume of water displaced by it?.

Solutions: to worksheet-7 Fluid

Objective Problems:

1.(D) 2.(A) 3.(D) 4.(A) 5.(A) 6.(D) 7.(C) 8.(B) 9.(D) 10.(B)

Subjective Problems :

  1. 5x104 N/m2
  2. 1.48 cm.
  3. 50 N
  4. dAg = 10.5x103 kg/m3
  5. Float, Volume = 100cm3

     

 

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