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What are the disadvantages of using cement paints?

1 user answered

Pritam Kumar, Rewa
User, Level 9 Contributor
  • Once you are done with the painting with cement paint, you will have to wet the surface and cure with water for at least 2 days.
  • Cement paint should be used within 2 hours as it would solidify and become useless after this.
  • It has a very limited range due to the alkaline nature of the surface compared to the many exterior shades in exterior emulsion paints.
  • It has a shorter life compared to exterior emulsion paints.
  • There could be problems like lie blooming which can cause patchiness and white streaks.
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What is the history of treadmills?

1 user answered

Jeshma Orusu, Hyderabad
User, Level 6 Contributor
At times an invented device may not be useful during it's initial stages but as time passes the utility of the device may become apparent or the device may be used for a very different purpose. One such device is treadmill, an important equipment of the modern day gym was actually used for punishing prisoners during the 1800s. Treadmills were invented in 1818 by an English engineer named Sir William Cubitt. Initial treadmills had a mechanism different from the present day treadmills, requiring the user to step upwards like walking up an endless staircase. 
The prisoners were made to turn a large paddlewheel by stepping on the spokes of the machine. Turning the wheel would in turn pump out water, crush grain, produce electricity, power ventilators in mines etc. Prisoners were often forced to spend up to six hours a day on the wheel in order to utilize their muscle power, to cure their idleness and to do useful work, this was equivalent of climbing about 5,000 to 14,000 feet. So the treadmill was used to torture and punish criminals. They remained in use to punish prisoners until the second half of the 19th century but later they were used to diagnose heart and lung disease in hospitals and  they gradually turned into exercise equipment. Treadmills today are used for various purposes like medical facilities (hospitals, rehabilitation centers, medical and physiotherapy clinics, institutes of higher education), sports clubs, Biomechanics Institute, orthopedic shoe shops, running shops, Olympic training centers, universities, fire-training centers, NASA, test facilities and training rooms of police and army, gyms and even home users. 

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Do packaged drinking water have an expiry date?

1 user answered

Jeshma Orusu, Hyderabad
User, Level 6 Contributor
Water usually doesn’t have an expiry date but the plastic bottle that contains water has an expiry date so the plastic bottle will eventually expire and will leach chemicals into the drinking water as the bottles are usually made up of polyethylene terephthalate (PET) bottles and high-density polyethylene (HDPE) . The chemicals from the plastic bottle may or may not make the water toxic and harmful but it will definitely change the taste of the water. So, even if the water bottle expires it is still safe to consume the water if and only if the bottle isn’t opened and is properly sealed because the packaging keeps the dust, oxygen, microbes, high heat, pesticides, gasoline and other agents away from the water and thus preventing the water from being spoiled. Also storing the water for too long will change the bottled water’s appearance and smell along with the change in taste but the water will still be safe to consume. According to various food laws all the food products and consumable goods sold should have an expiration date and when Plastic or PET based water bottles are exposed to sunlight for a very long time algae or fungal depositions start taking place which is indicated by a light green tint on the bottle’s surface, water from such plastic containers shouldn’t be consumed. The average time of such micro-bacterial decomposition based on average storage conditions will give the expiry date that is to be displayed on the water bottle, therefore even though water doesn’t have an expiry date it is necessary to display an expiry date on the plastic bottle or contains. 



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What are the advantages of using a sweater comb?

1 user answered

Taran Luthra, Bilaspur
User, Level 8 Contributor
  • Because of its smaller size, a sweater comb can do a more precise and careful job of defuzzing a clothing
  • The wire mesh in a sweater comb does a good job of catching loose hairs as well as fuzz.
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What are the disadvantages of using a sweater stone?

1 user answered

Taran Luthra, Bilaspur
User, Level 8 Contributor
  • When you stroke the sweater stone across a clothing, it can leave behind a lot of tiny sand-like particles behind. So defusing using a sweater stone can be messy.
  • While it can catch loose hairs, one should be careful when using a sweater stone on loose or delicate knits.
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What are the advantages of using a sweater stone?

1 user answered

Taran Luthra, Bilaspur
User, Level 8 Contributor
  • The large size of the sweater stone makes it an ideal choice to quickly defuzz a clothing.
  • Its porous nature ensures that it can remove loose hairs of fuzz easily.
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What is a sweater stone?

1 user answered

Taran Luthra, Bilaspur
User, Level 8 Contributor
It is a piece of porous pumice stone which can catch and pull loose fibre in clothes. It is an effective solution to combat pilling in clothes. But because it is a bit clunky and unwieldy, it is not recommended on delicate or loose knits.
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What are the facts related to blood?

1 user answered

Jeshma Orusu, Hyderabad
User, Level 6 Contributor
  •  Blood constitutes eight percent of the total body weight.

  • Mosquitoes usually prefer the blood type O

  • Spiders, lobsters and snails have blue colour blood. Earthworms and leeches have green blood. Starfish has clear or yellowish blood.

  • White blood cells constitute one percent of the total blood.

  • Blood also contains very few milligrammes of gold.

  • A red blood cell takes thirty seconds to travel the entire body.

  • -During pregnancy, the amount of blood in their body usually increases by fifty percent.

  • New borns have only one cup of blood in their entire body.

  • 1.3 million pints of donated blood is spoiled every year since blood only has a shelf life of forty days.

  • Pus is nothing but the dead white cells.

  • Cows have more than eight hundred blood types.

  • In humans, most familiar blood groups are O, A, B and AB.
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What is a colour doppler?

1 user answered

Saurabh Bhondekar, Bhilai
User, Level 9 Contributor
It is a colour encoded sonography of the blood vessels whereby the blood flow is seen in colour. Similar to sonography, there is no injection of contrast here, though.
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