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Why does an iron needle float on clean w...

Why does an iron needle float on clean water but sink when some detergent is added to this water?

A

addition of detergent increases the density of water

B

addition of detergent reduces the surface tension of water

C

solution of detergent decreases the density of water

D

addition of detergent increases the surface tension of water

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The correct Answer is:
B
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Surface tension is the property of a liquid by virtue of which the free space of the liquid at rest tends to have minimum area and as such it behaves as if covered with a stretched membrane. It is measured as the force acting an unit length of a line imagined to be drawn tangentially anywhere on the free surface of liquid at rest. It acts at right angles to this line on both sides and along the tangent to the liquid surface. The iron needle will floats on clean water but sink when some detergent is added to this water (a) True (b) False

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NIKITA PUBLICATION-SURFACE TENSION-Multiple Choice Questions (Question Given in MHT-CET )
  1. Why does an iron needle float on clean water but sink when some deterg...

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

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  3. A capillary tube when immersed vertically in a liquid records a rise o...

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  4. The rain are in spherical shape due to

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  5. Water can rise upto a height of 12 cm in a capillary tube . If the tub...

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  6. When a liquid rises inside a capillary tube , the weight of the liquid...

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  7. The height of water in a capillary tube os radius 2 cm is 4 cm . What ...

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  8. Two spherical soap bubbles of radii r1 and r2 in vacuume coalesce unde...

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  9. Amount of energy required to blow a bubble radius 5 cm , is

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  10. The dimensions of surface tension are

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  11. Two soap bubbles have radii in the ratio of 4:3 . What is the ratio o...

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  12. If the surface of a liquid is plane, then the angle of contact of the ...

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  13. Work done is blowing a soap bubble of diameter 2 cm , is

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  14. The surface of water in contact with glass wall is

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  15. Work done in forming a liquid drop of radius R is W(1) and that of rad...

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  16. For liquid to rise in a capillary tube , the angle of contact should b...

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  17. Out of the following , which is not an example of capillary action

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  18. If a liquid does not wet glass, its angle of contact is

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  19. The surface tension of soap solution is 0.035 N/m . The energy needed...

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  20. A square frame of length L is immersed in soap solution and taken ou...

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  21. The potential energy of molecule on the surface of a liquid as compare...

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