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The force required to take away a flat c...

The force required to take away a flat circular plate of radius 4 cm from the surface of water is

A

560 `pi` dyne

B

560 dyne

C

`5.6 pi`

D

`56 pi` dyne

Text Solution

Verified by Experts

The correct Answer is:
A
`F = T xx 2 pir = 70 xx 2 xx pi xx 4 = 560 pi ` dyne
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NIKITA PUBLICATION-SURFACE TENSION-Multiple Choice Questions (Surface tension )
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  2. The surface tension of pure water is

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  3. The surface tension of a liquid is 70 "dyne" // cm . In MKS system its...

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  5. If the length of a needle floating on water is 2 cm then the additiona...

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  6. The surface tension of a liquid is 10^(8) dyne cm^(-1). It is equivale...

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  7. The force required to take away a flat circular plate of radius 4 cm f...

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  8. A circular loop of a thin wire of radius (7//pi) cm is suspended fro...

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  9. A platinum wire ring of radius 2.5 cm floats horizontally on the surf...

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  10. A wire of length L metres, made of a material of specific gravity 8 is...

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  11. The length of needle foating on the surface of water is 1.5 cm the for...

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  12. A circular wire of length 0.1 m is touching the surface of the liquid ...

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  13. The force of surface tension on a ring situated on the surface of wate...

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  14. A soap film is formed in a rectangular frame of length 7 xx 10^(-2) m...

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  15. A ring of radius r, and weight W is lying on a liquid surface . If the...

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  16. A straight piece of wire 4 cm long is placed horizontally on the sur...

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  17. A U-shaped wire is dipped in a soap solution, and removed. A thin soap...

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  18. A circular loop of thin wire of radius 7 cm is lifted from the surface...

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  19. A metal ring of internal and external radii 15 mm and 20 mm respective...

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  20. A thin liquid film of thickness 5 xx 10^(-5) m is formed between tw...

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