8th Sci, Exercise -  3 Force and pressure.

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1.  The object floats if the buoyant force is .......... than its weight.
2. Define:- pressure.
3.  Define:- contact force.
4. The SI unit of force is ...... .
5. At the sea level the atmospheric pressure .................. is acting on a table top of size 1m^2.
6. The ........  increases as the depth of the liquid increases.
7. 1 bar = ..... Pa.
8. Write down formula of density.
9. The atmosphere exist to about .... km height.
10. Write true or false. Force is a vector quantity.
11. Define Buoyant force.
12. ....... ....... has no unit.
13. Write Archimedes principle.
14. The object sinks if the buoyant force is ............ than its weight.
15. The property ........  is very useful in deciding the purity of the substance.
16. On which factors buoyant force is depend.
17. Write down commercial uses of Archimedes principle.
18. Define:- Non contact force.
19. Relative density of a substance is called its ........  .........  .
20. The area of the tip of a screw is 0.3 mm square and its weight is 0.6 Newton. Calculate the pressure (in Pa) exerted by this screw on the wooden plank.
21. Define:- inertia of the state of rest.
22. At any one level the liquid pressure is the ......... .
23. Write down formula of relativity  density.
24. The object floats inside the liquid if the buoyant force is ...... to its weight.
25. The area of the bottom of a tiffin box is 0.25 m^2 and weight is 30 Newton, calculate the pressure exerted by the box on the shelf.
26. The SI unit of density is ..... .
27. Define:- Inertia of motion.
28. The SI unit of pressure is ....... .
29. The relative density of a substance is expressed w.r.t. the density of ........
30. Define:- Directional inertia.
31. Write 3 examples of contact force.
32. 1 Atomosphere = 101 x ..... ..... .
33. A piece of marble tile weighs 90 gram in air. If it's density is 3.0 g / cc, what will be its weight in water?
34. All gases and liquids have a common name ..... .
35. The air pressure at the sea level is called 1 ....... ........ .
36. Atmospheric pressure is specified in the units mbar or ....... .
37. The camel is called the ship of the desert.
38. True or false. Pressure is a vector quantity.
39. Write 3 examples of non contact force.
40. Write formula of pressure.
41. Area is measured in ....... .
42. In atmospheric science, the unit for pressure is ..... .

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