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Why does a ballon filled with hydrogen o...

Why does a ballon filled with hydrogen or helium gas rise up?

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MODERN PUBLICATION-FLOATING BODIES-EXERCISE
  1. Why does a ballon filled with hydrogen or helium gas rise up?

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  2. What is the force acting perpendicular to the surface of an object cal...

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  3. What is the S.I unit of thrust?

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  4. (Thrust)/(Area) =

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  5. The S.I unit of presure is pascal (Pa) or Nm^-2. (T or F)

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  6. Is pascal big unit or a small unit for practical usage?

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  7. Thrust is a quantity.(scalar/vector)

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  8. Why is the needle end of an injection sharp?

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  9. Pressure is a vector quantity. (T or F)

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  10. Give two applications where is beneficial high pressure

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  11. Give two applications where is beneficial low pressure

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  12. A force of 200 N acts on an area of 1cm^2 uniformly . Find the pressur...

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  13. A uniform cube of edge length 5 cm and mass 5 kg is kept on a table to...

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  14. A girl of weight 40 kgf is wearing sandal with head of area 2cm^2. Fin...

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  15. Calculate the greatest and the least pressure exerted by a metal block...

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  16. The atmosphere pressure at a place isw 10^5 Pa. What thrust does it ex...

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  17. A block of wood is kept on the table top. The mass of wooden block is ...

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  18. A block of wood is kept on the table top. The mass of wooden block is ...

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  19. In what direction does the buoyant force on an object immersed in a li...

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  20. When a partially floating body is pressed down a little, its weight, w...

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  21. When a partially floating body is pressed down a little, its its upthr...

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