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A iron needle slowly placed on the surfa...

A iron needle slowly placed on the surface of water floats on it because

A

when inside water, it will displace water more than its weight

B

the density of the material of the needle is less than that of water,

C

its surface tension

D

of its shape

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The correct Answer is:
C
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ICSE-COMPETITION CARE UNIT-PROPERTIES OF MATTER (SURFACE TENSION )
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  2. A needle can float on clear water but sinks when some detergent is add...

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  3. A liquid does not wet the solid surface if the angle of contact is

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  4. The work done to blow a scap bubble of radius. R (surface tension T)

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  5. A drop of oil is placed on the surface of water. Which of the followin...

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  6. At critical temperature, the surface tension of a liquid

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  7. Two spherical soap bubbles of radii r(1) and r(2) in vaccum coalesce u...

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  8. Energy needed in breaking a drop of radius R into n drops of radius r,...

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  9. There is a horizontal film of soap solution. On it a thread is placed ...

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  10. Soap helps in cleaning the clothes because

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  11. When two capillary tubes of different diameters are dipped vertically,...

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  12. Workdone to blow a bubble of volume V is W. The workdone is blowing a ...

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  13. The work done is increasing the size of a soap film from 10 cm xx 6 cm...

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  14. An incompressible fluid flows steadily through a cylinder pipe whic...

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  15. By inserting a capillary tube into a depht l in water, the water rises...

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  16. Water rises to a height 0f 10 cm in a capillary tube, and mercuryfalls...

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  17. A square wire fram of size L is dipped in a liquid. On taking out a me...

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  18. In a surface tension experiment with capillary tube water rises upto 0...

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  19. Two unequal soap bubbles are formed one on each side of a tube closed ...

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  20. The radii of two soap bubbles are r(1) and r(2) (r(2) lt r(1)). They m...

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