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Water does not run out of a dropper unle...

Water does not run out of a dropper unless its rubber bulb is pressed.

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Water is held inside the dropper against the atmospheric pressure. When the rubber bulb is pressed, pressure on water becomes greater than the atmospheric pressure and it comes out.
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RESONANCE ENGLISH-FLUID MECHANICS-Board Level Exercise
  1. The bags and suitcases are proveded with broad handles. Why?

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  2. While sking on snow, a skier wear skis in addition to the shoes. Why ...

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  3. A drawing pin having a broad head can be easily fixed on a board. Expl...

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  4. The sports boot for soccer and hockey have studs on their soles. Why?

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  5. Water does not run out of a dropper unless its rubber bulb is pressed.

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  6. The blood pressure in humans is usually taken using the arm. How ever ...

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  7. The walls of dams are made stronger and thicker at the bottom. Why?

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  8. It is difficult to stop bleeding from a cut in human body at high alti...

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  9. What is meant by one torr of pressure ?

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  10. What is one bar of pressure ?

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  11. What are the factors, which effect the atmospheric pressure at a place...

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  12. Explain why (a). The blood pressure in humans is greater at the feet...

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  13. State the principle of floatation.

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  14. One small and one big piece of cork are pushed below the surface of wa...

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  15. A cork is floating in a water tube. What is the apparent weight of the...

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  16. A ship made of iron can float in water but an iron needle sinks. Why ?

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  17. Why is it easier to swim in sea water than in fresh water?

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  18. Straws are used to take soft drinks. Why ?

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