CBSE Worksheet for chapter-7 Fluid class 9

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/m ²
   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. 1.01x10 ⁵ N/m ²
   2. 1.01x10 ^-5 N/m ²
   3. 1.01x10 ⁷ N/m ²
   4. 1.01x10 ^-7 N/m ²
6. Unit of relative density is:
   1. kg/m ³
   2. g/m ³
   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/cm ³
   2. 0.5 g/cm ³
   3. 0.75 g/cm ³
   4. 1 g/cm ³
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/s ² )
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/s ² )
9. The relative density of silver is 10.5. The density of water is 10 ³ kg/m ³ . What is the density of silver in S.I. unit?
10. A body of volume 300 cm ³ 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: