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A piece of chalk when immersed in water ...

A piece of chalk when immersed in water emits bubbles. Why?

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A chalk piece consists of pores forming capillarities. When it is immersed in water, the water begins to rise in the capillarities and air present is expelled which goes out in the form of bubbles.
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PREMIERS PUBLISHERS-PROPERTIES OF MATTER-OTHER IMPORTANT QUESTION & ANSWERS (CONCEPTUAL QUESTIONS)
  1. Mercury does not wet the glass. Why?

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  2. A needle floats in clean water, but sinks in soap solution. Why?

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  3. A piece of chalk when immersed in water emits bubbles. Why?

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  4. Small bits of camphor dance about in clear water but not on one contam...

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  5. Oil calms the stormy waves on the sea. Why?

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  6. Explain why sand is drier than clay.

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  7. Two streamlines cannot cross each other. Why ?

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  8. Why is the tip of the nib of a pen split?

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  9. Why tiny drops of fog act as rigid bodies?

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  10. Small drops of mercury are found to assume a spherical shape. Why?

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  11. Why does a stone sink when placed on the surface of water?

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  12. Among solids, liquids and gases, which can have all the three modulus ...

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  13. Write copper, steel, glass and rubber in the order of increasing coeff...

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  14. Which is more elastic -water or air?

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  15. Why are springs made of steel & not of copper ?

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  16. Following are the graphs of elastic materials which one corresponds to...

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  17. It is difficult to stop bleeding from a cut in human body at high alt...

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  18. In soldering, addition of flux makes soldering easily why?

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  19. Which type of strain is there, when a spiral spring is stretched by a ...

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  20. When bits of camphor are dropped on water, they move erratically. Why?

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