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CBSE Class 11-science Answered

a.Washing of clothes and dishes is more effective with hot water tham with cold water
 
b.The property of surface tension helps in clinical test for jaundice
 
c.hot air is filled in balloons for meteorological observations 
 
d.We use a pressure deodrant can for a few seconds, the can tends to become cooler 
 
e.When the ping pong ball, a toy of the children,gets dented without being punctured.What do we do to regain the original shape and why?
Asked by Ginni2k | 11 Nov, 2016, 11:34: PM
answered-by-expert Expert Answer
Dear Ginni2k@gmail.com

Thanks for asking us a question in Ask the Expert section of TopperLearning.com.

We cannot entertain more than 5 questions in a single question per day. In case of multiple questions within a query, please post each question individually and let us know where you are getting stuck so that we would be able to explain things better.
 
Answer to your first question is given below:
 
 
a.

It is always better to wash dishes and clothes in hot water instead of cold since hot water has more cleaning power.

 

Hot water facilitates for quicker dish washing and avoids the requirement for a large amount of dish washing liquid and detergents.

 

Bacteria and microorganisms are there on dirty dishes and clothes, and hot water is the best way to kill them.

 

If the temperature of the dishwater is less than 90 degrees Fahrenheit, a greasy film may coat drying dishes, leaving the dishes not fully cleaned.

To keep hands safe when washing and rinsing dishes in hot water, it is advisable to wear rubber gloves.

The use of hot water facilitates the dishes to air-dry naturally.

Therefore washing of clothes and dishes is more effective with hot water than with cold water.

 


Regards

Topperlearning Team.
Answered by Vaibhav Chavan | 12 Nov, 2016, 11:55: AM

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