APS, Golconda | Priyanka Gupta: February 2018

Friday 16 February 2018

1. Define thrust. What is its unit?

2. Define pressure. What is the S.I unit for pressure?

3. STATE ARCHIMEDES PRINCIPAL. GIVE ITS TWO APPLICATIONS.

4. State the two factors on which pressure depends. Show with the help of formula. State one example showing effect of area on pressure.

5. A 100 cubic cm block has a mass of 395 g. find its relative desity. density of water 1 g/ cubic cm.

6. Calculate the pressure when a force of 200 N is exerted on an area of –

a.) 10 cm²

b.) 5 m^2.

7. Pressure exerted by cubical box of side 4 cm on the surface is 10 Pa. what is the weight and mass of the block. (Use, g = 10 m/s²).

8. A pressure of 150 Pa acts on an area of 15 m². What is the force acting on the area? What force will be exerted by the application of same pressure if the area is made one-fifth?

9. rectangular wooden block has length, breadth and height of 25 cm, 5 cm and 15 cm, respectively. This wooden block is kept on the ground in three different ways, turn by turn. Which of the following is the correct statement about the pressure exerted by this block on the ground? Explain why?

a.) The maximum pressure is exerted when the length and breadth form the base.

b.) The maximum pressure is exerted when the length and height form the base.

c.) The maximum pressure is exerted when the breadth and height form the base.

d.) The minimum pressure is exerted when the length and breadth form the base.

10. An object is put in four liquids having different densities as, d₁,d₂ ,d₃ ,d₄ . If d₁ > d₂ > d₃ > d₄. Which liquid exerts the maximum upward force? Why?

11. When a golf ball is lowered in a measuring cylinder containing water, the water level rises up by 30 cm³ when the ball is completely submerged. If the mass of the ball in air is 33 g.

a) Find density of object.

b) State whether ball will sink or float.

c) Mass of water displaced.

d) Buoyant force acting on ball.

12. 5 N of force acts on material A over the area of 20 m² whereas 20 N of force acts on area 40 m² of material B. Which has exerted the greater pressure? Calculate the ratio of pressure exerted by the two.

13. The relative density of four liquids P, Q, R, and S are 1.26, 1.0, 0.84, and 13.6 respectively. Which of the following liquid will exert maximum and minimum upthrust on object, if object immersed in these liquids?

14. A mass of 2 m³ of steel is 15600 Kg. when this mass completely immersed in water, calculate:

a) Density of object in Kg/m³.

b) State whether the steel mass will sink or float?

c) Mass of water displaced.

d) Buoyant force acting on steel.

115.WHAT is uptrust? write application of lactometer and hydrometer. name the principal they are based on?