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It is better to wash clothes in hot wate...

It is better to wash clothes in hot water than in cold water .Explain .

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The surface tension of hot water is less so it wets more to the clothes .Hence clothes wash better .
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KUMAR PRAKASHAN-MECHANICAL PROPERTIES OF FLUIDS -SECTION -C (Objective Questions) (VSQs)
  1. Why surface tension of antiseptics kept less ?

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  2. Explain why is hot soup more testy than the colder one ?

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  3. It is better to wash clothes in hot water than in cold water .Explain ...

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  4. Detergents is added to water for removing dirt from clothes.Explain .

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  5. Why colours and lubricating oil have less surface tension ?

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  6. Arrange the following liquids in increasing order of surface tension ....

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  7. If a liquid does wet the surface ,its angle of contact is acute or obt...

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  8. Liquid is stick to the glass then angle of contact for liquid glass wi...

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  9. On what factors does the value of angle of contact depend ?

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  10. How angle of contact depend on temperature ?

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  11. Why tefllon is coated ,the angle of contact between oil and non -stick...

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  12. Why raincoat does not wet in rain ?

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  13. Water rises to a height of 20 mm in a capillary . If the radius of th...

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  14. How the oil lamp produces light through a wick that is lit using a mat...

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  15. Why the moisture is retained in soil when a farm is being plough ?

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  16. Why it is better to wear cotton clothes in summer ?

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  17. Why the refill of marker pen which is used to write on white board is ...

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  18. Why does the water rise in a capillary tube Explain .

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  19. Why does the mercury fall in a capillary tube ?

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  20. A 20 cm long capillary tube is dipped in water The water rises upto 8 ...

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