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453. What does Captcha [ C.A.P.T.C.H.A ] stand for ?

Captcha stands for:
Completely Automated Public Turing test to tell Computers
and Humans Apart.
It is used by many websites to make it harder for automated
bots to download information from them.
This bots are usually made by hackers and so many websites use this technology to counter them. it's not always successful because the bots are getting more sophisticated.
 
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451. What is E-mail Spoofing?

Ans- E-mail spoofing is the forgery of an email header so that the message appears to have originated from someone or somewhere other than the actual source. Email spoofing is a tactic used in phishing and spam campaigns because people are more likely to open an email when they think it has been sent by a legitimate source.
The goal of email spoofing is to get recipients to open, and possibly even respond to, a solicitation.
 
450. What is purpose of filter in cigarettes ?

A cigarette filter has the purpose of reducing the amount of smoke, tar, and fine particles inhaled during the combustion of a cigarette.
Filters also reduce the harshness of the smoke.

Most cigarette filters are made of the same material as camera film (cellulose acetate). Each individual filter is made of thousands of tiny fibers. The inside of the filter is painted white to make it appear clean. During smoking, these fibers can come off into your mouth and be inhaled into your lungs.
 
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