Class 9th Physics Unit 7 Properties of Matter

physics 9th notes Chapter No 7

1. When temperature of the matter increases, intermolecular forces


2. The unit of pressure is:


3. The force exerted perpendicularly on unit area of an object is called:


4. What is young modulus of bone?          


5. What is young modulus of Rubber?                                            


6. According to Kinetic Molecular theory, gases exert pressure on the walls of the container due to their:


7. Weakest attractive forces are in


8. Unit of pressure is


9. A solid object is:


10. The object will sink in the liquid surface when:


11. Buoyant force is equal to the —– of the liquid displaced by the object:


12. The unit of Young’s modulus is:


13. The law about pressure on the object is presented by:


14. When temperature of the gas increases, gas pressure:


15. The force that acts on unit area of an object and thus changes its shape or size:


16. Ionic state of matter is called


17. If a body is at a depth of `h’ from the liquid surface of density `p’, then the pressure on that body is:


18. The molecules of the matter are always remain in the state of:


19. What is young modulus of wood (Parallel gain)?                                             


20. Plasma is


21. If quantity of the gas is increased in the container then gas pressure


22. Molecules of which state of matter have strongest attractive for


23. _____ tells about the floating and sinking of objects:


24. According to Hooke’s law, within the elastic limit stress and strain has proportion:


25. The ratio of tensile stress and tensile strain is:


26. What is young modulus of nickel?                                             


27. Unit of density


28. Hydraulic brake works on the principle of:


29. The law about stress and strain is presented by:


30. The instrument used to measure atmospheric pressure


31. What is young modulus of Tungsten?                                                         


32. The property of the matter due to which it restores its size and shape when force ceases to act on it:


33. In system international, the unit of stress is:


34. Pressure depends upon:


35. The object will float on the liquid surface when:


36. Submarine works on the principle of:


37. If pressure is exerted on a liquid, liquid transmits it:


38. When stress is increased, the strain also goes on:


39. At sea level atmospheric pressure is:                                            


40. The energy possessed by the molecules of the matter due to its motion:


41. What is young modulus of brass?


42. The ratio of change in length to the original length is:


Short Questions

A small force applied on the smaller piston, results into a large force on the larger piston. Why?
Calculate the density of 5 litres of water?
Can we use a hydrometer to measure the density of milk?
Define deforming force.
Define density. Write its formula and unit?
Define Elasticity.
Define the term pressure.
Describe briefly about the matter?
Differentiate between stress and strain?
Does there exist a fourth state of matter? What is that?
How is a syringe filled with a liquid?
How soap bubbles are produced. Why the soap bubbles so formed have spherical shapes?
How the kinetic molecular model of matter helps differentiate various states of matter?
Is an iron object heavier than that of wood?
It is easy to remove air from a balloon but it is very difficult to remove air from a glass bottle why?
On what factors pressure of the liquids depends?
Show that atmosphere exerts pressure.
State Pascal’s law.
What changes are expected in the weather if barometer reading shows a sudden increase?
What do you know about density of the Earth’s atmosphere?
What does it mean when the atmospheric pressure at a place falls suddenly?
What is a barometer?
What is meant by density? What is its SI unit?
What is meant by elasticity?
What is strain?
What is stress?
Why does a piece of the stone sink in water but a ship with huge weight floats?
Why does atmospheric pressure changes with altitude?
Why hydraulic press is called as force multiplier.
Why is 1cm cubed of wood lighter than 1 cm cubed of iron?
Why water is not suitable to be used as the barometer?
Write any three examples of pressure?
Write down the density equations?
Write factors effecting pressure:
Write some applications of Pascal’s law.
Write the procedure for measuring atmospheric pressure with the help of barometer?

Long Questions


A cube of glass of 5 cm side and mass 306 g, has a cavity inside it. If the density of glass is 2.55 gcm⁻³. Find the volume of the cavity.
A solid block of wood of density 0.6 gcm⁻³ weighs 3.06 N in air. Determine (a) volume of the block (b) the volume of the block immersed when placed freely in a liquid of density 0.9 gcm⁻³ ?
A steel wire of cross-sectional area 2×m⁻⁵  m² is stretched through 2 mm by a force of 4000 N. Find the Young’s modulus of the wire. The length of the wire is 2 m.  
A student presses her palm by her thumb with a force of 75 N. How much would be the pressure under her thumb having contact area 1.5cm² ?
A uniform rectangular block of wood 20 cm x 7.5 cm x 7.5 cm and of mass 1000g stands on a horizontal surface with its longest edge vertical. Find
 (i) The pressure exerted by the block on the surface
 (ii) Density of the wood.
A wooden block measuring 40 cm x 10 cm x 5 cm has a mass 850 g. Find the density of 3 wood.
Calculate the volume of the following objects:
 (i) An iron sphere of mass 5 kg, the density of iron is 8200 kgm⁻³
 (ii) 200 g of lead shot having density 11300 kgm⁻³
(iii) A gold bar of mass 0.2 kg. The density of gold is 19300 kgm⁻³
Define Young’s Modulus and derive its mathematical formula.
Determine the density of an object using the Archimedes principle?
Explain how a submarine moves up the water surface and down into the water.
Explain how a wooden block, ships and boats move up the water surface.
Explain the braking system of the vehicles.
Explain the Principle of Floatation.
Explain the working of a hydraulic press.
How density of an object can be found by Archimedes principle?
How kinetic energy molecular model of matter helps differentiate various states of matter?
How much would be the volume of ice formed by freezing 1 litre of water?
Prove that (P = ρgh)
Show that atmosphere exerts pressure.
State and explain Archimedes Principle.
State and explain the Hooke’s Law.
State Archimedes Principle.
State Pascal’s law with applications
State relation for pressure beneath a liquid surface to depth and density?
The density of air is 1.3 kgm⁻³. Find the mass of air in a room measuring 8m x 5m x 4m.
The diameter of the piston of a hydraulic press is 30 cm. How much force is required to lift a car weighing 20 000 N on its piston if the diameter of the piston of the pump is 3 cm? 
The head of a pin is a square of side 10 mm. Find the pressure on it due to a force of 20 N. 
What do you know about Young’s modulus? How would you determine young’s modulus of an object?
What is atmospheric pressure? And explain atmospheric pressure with the help of an
What is Hook’s law? What is meant by elastic limit?
What is upthrust? Explain the principle of floatation.
Which device is used to measure the atmospheric pressure? Explain the measurement
Write a note on variation in atmospheric pressure.

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