2080-10-15

A. Define the terms:-

1. Pressure 2. Atmospheric pressure

3. One atmospheric pressure 4. Liquide pressure

5. Hydraulic pressure 6. Hydraulic brake

7. Hydraulic garage lift 8. Density

9. Relative Density 10. Upthrust

11. Hydrometer 12. Lactometer

13. Hydraulic lift 14. Normal atm. pressure

15. One Pascal pressure

B. General question:-

Prove P= F/A. What is the relation between pressure, force and area?
What is liquid pressure, prove p= hdg? Where each alphabet have there own meaning?
Verify the Pascal's experimentally.
Prove that by applying a small effort large force is produced by hydraulic lift.
State the relation between density of liquid and its upthrust.
State the Pascal's law. Name an instrument which depends on it.
State law of floatation. Which principle is the hydrometer based on ? Write any two instruments based on Pascal law?
Weight of an object is decreased when immersed in water, which law does this statement represent?
What is the role of water in hydraulic press to multiply small force into large one?
If an object is immersed in water at what condition can it float in water and at what condition it an sink in water?
What is the relation of upthrust of a liquid with it density? Proof that liquid pressure is directly proportional to the depth of liquid.
State the law of floatation. Name a device based on that law and mention its use.
State Archimedes principle? Prove: U=Vdg.
Proof: U=(h2-h1)Adg . State the relationship between density and Upthrust.
On what factor of liquid upthrust depends upon?
A body is partially or completely immersed in a liquid experiences an up thrust due to the liquid. Which is equal to the weight of liquid displaced by it? Which principle does the statement represent?

C. Give reason:-

All cutting and piercing tool such as scissors, needles, knives etc. have sharp edges, why?
A sharp knife is more effective in cutting an object than a blunt knife, why?
The foundation of a building is made wider than walls, why?
The girls with heeled pointed shoe would make deep impression on the clay road than an elephant moving along same road, why?
It is easier to move our limbs in air than in water, Why?
The blood pressure in human body is greater at the feet than at the brain, Why?
Give reason, why the wooden sleeper is used below the rails?
Back wheels of the tractor are made wider, why?
Camel can walk on desert but horse can't, why?
The pressure exerted by a girl wearing pointed heel shoes is more than that exerted by an elephant, why?
One of the two ladies with the same weight is wearing pointed shoes and the wearing flat shoes. Explain which one exerts more pressure on the ground.
The bottom of the wall in a dam is made comparatively thicker, why?
It takes less time fill the bucket from the tap of lower floor than the top of upper floor, why?
Why egg floats in salty water but not in fresh water?
An iron nails sinks in water but a ship made up of iron floats on water, why?
What will be the effect in the weight of displaced water if load is added into the ship floating in the ocean? Write the reason.
A whole at the bottom of a boat is more dangerous than that at the side, why?
The ice made of water float on water, why?
When a ball is pressed in water, why does it try to come up?
Why is it easier to pull a bucket of water from the well until it is inside the water but difficult out of water?
It is easy to lift a heavy stone under the water, why?
The weight of an object decreased inside the water, Why?
A ship coming from the sea enters the the river will it float in the river water? Give reason.
It is easier to swim on the sea than on the pond, why?
Deep divers wear special protective suits, why?
One of two ladies with the same weight is wearing pointed heeled shoes and another wearing flat shoe. Explain which one exerts more pressure on the ground?
An iron nails float in mercury but sinks in water, why?
A heavy bulb in made at the base of a hydrometer, why? write two function of its.
How many forces act on a body floating in water, why? What are those forces? In which direction do they work?
A tank filled with water in Himalaya id brought in terai. What changes occurs in the pressure at the bottom and why?
Why ship carry more load than aeroplane?

D. Difference between:-

1. Archimedes principle and Law of floatation.

2. Density and Relative Density.

3. Empty ship and Loaded ship.

E. Numerical Questions:-

Ojaswee has a mass of 30 kg and the surface area that her sandal occupies is 150cm², then what will be the magnitude of pressure if she stands only on one foot? {Ans: 1.94 x 10⁴pa}
Taranga has a mass of 50 kg and the surface area of his one foot is 3000 mm², find the pressure exerted by him when he stands with two feet? {Ans:8166.66 pa}
Bina has mass 45kg and the surface area that her sandal occupies is 210 cm², what is the pressure exerted by him on the ground when he stepped with one foot? {Ans: 21428.57 pa}
A body of mass 2kg suspended from spring balance the read 10N when the body is completely immersed in water(g=10m/s²) find i). Upthrust of water on the body. ii). Mass of the water displaced. iii.. Volume of the water displaced. If density of water is 100kg/m³. {Ans: 10N, 1kg, 100cm³}
How much part of an ice block (10cm X 5cm X 3cm) remains above the surface of water when placed in water? Also find the height of the ice above water surface if the height of the ice is 30 cm.(density of ice = 0.9gm/cm³ and density of water is 1gm/cm³) {Ans: 9/10 and 0.3 cm)
A brick of mass 1kg and density 2.5gm/cm³ is immersed in water, how much mass of the water is displaced by it? {Ans: 400g}
An ice block of (60 cm X 40 cm X 30 cm) is floating on water what portion of ice should be outside the water if the density of ice berg is 0.75gm/cm³? {Ans: 1/4 part}
If the cross-sectional area of piston A is 20cm², Piston B is 60cm2 and effort of 50N is applied on A how much load is needed in piston B to balance it? {Ans:150 N}
What part of a block of dimension 8 cm X 5cm X 4cm remains immersed in water of density 1000kg/m³ when the block has a density of 800kg/m³? {Ans:4/5 part}
A wooden block having a volume 4000cm3 floats on water. What portion of it remains above water(Density of wood =0.8gm/cm³ and density of of water=1gm/cm³) {Ans: 1/5 part}
The volume of an ice block is 36000cm³ and its density is 0..9gm/cm³. How much part of its remains inside the surface of water when it is kept in the water? {Ans: 9/10 part}
A cube made of oak and of side 15cm float in the water 10.5m of depth below the surface and with its sides vertical. What is the density of the oak? {Ans: 700kg/m³}
A block of wood of mass 24kg floated in water, the volume is 0.032m3. Find the volume of the block below the surface of the water and the density of the wood? Density of the water=1000kg/m³ { Ans: 0.024m3 and 750kg}
A cube of wood of volume of 0.2m3 and density 600kg/m³ is placed in a liquid of density 800kg/m³. What fraction of the volume of the wood immersed in the liquid? {Ans: 3/4 part}
In a hydraulic press, if the cross-sectional area of a small piston is 100cm². A big piston is 1m² and effort of 10N is applied on the small piston than how much load can be raised on the big piston? { Ans: 1000N}
If a man has mass 60kg and the area of his one foot is 120cm², what is pressure exerted by him on the ground when he stepped with one foot? {Ans: 50000 Pa}
The dimension of water tank is 3mX2mX2m and water is hall filled in it. Calculate the liquid pressure. {Ans: 9800 Pa}
What will be the pressure exerted at the depth of 6m pond, where the acceleration due to gravity is 9.8m/s².( Density of water is 1000kg/m3) {Ans: 58800 Pa}
A metallic box of mass 3000kg and dimensions 3mX2mX1m has been kept on water with density 1000kg/m3 whether it sinks or float on water? Give reason to justify your answer.
What will be the pressure of mercury column if height of mercury column in a barometer is 70cm, density of mercury is 13600kg/m3 and acceleration due to gravity is 10m/s2. {Ans: 95200 Pa}
Calculate the pressure exerted by a mercury column of 76cm high at its bottom. Given that the density of mercury is 13600kg/m3 and g=9.8m/s2. { Ans: 1.01x105 Pa}
A water tank of 5m height is filled with 4m water calculate the pressure. i). On the surface {Ans:0 Pa} ii). At the middle { Ans: 20000 Pa} iii). At the bottom {Ans: 40000 Pa}
Two tank are taken. One if filled with mercury 2 m height. How high the next tank must be filled so that both tanks experience equal pressure on their bottom. {Ans: 27.2 m}
A water tank is filled 10m height of water. It is taken from earth to the moon. How much time does the pressure on the bottom of the tank change. (Acceleration due to gravity of moon =1.6m/s2) neglect the variation of density due to atmospheric pressure. {Ans: Decreased by 6.25 times}
In a hydraulic pressure, the cross-sectional area of small(A) cylinder is 80cm2 and that of big (B) cylinder is 8m2. Calculate the effort needed on cylinder "A" to lift a load 60000N on cylinder "B". { Ans: 60N}
A brick of mass 1kg and density 2.5 gm/cm3 is impressed in water, how much mass of water is displaced by it? {Ans: 400g}

Class:-10 (Science) Part:-1(Physics) Chapter: Pressure

A. Define the terms:-

B. General question:-

C. Give reason:-

D. Difference between:-

E. Numerical Questions:-

For diagrammatic question keep visiting. Soon we are going to upload.

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