No. Queries do not need to be capitalized.
No, keywords do not have to be capitalized.
Maybe google?
Google your queries you will found an accurate answer from there.
A keyword is a key for online users who use it to operate the search engine for their queries in the form of words and phrases to find information. A keyword is a valuable part of a website because it tells search engines about the content of your website page. “Keywords” are terms that indicate the words or phrases that an online user enters into a search engine to find the information that they are looking for. If a user’s search keywords match the keywords on your site, then the search engine will display your site on the search result page. Hope this will be helpful for you.
No, just capitalized. i.e. Google
Using Google's Adsense, you can advertise across the internet. You utilize keywords that are related to what you are advertising. When people search for these same keywords using Google, your ad appears.
A good tagline for Google Plus would include relevant keywords.
Adwords Keyword Tool
Google Adwords helps one to market a product or website. Keywords are chosen that are associated with your website and when a user searches for those keywords, your site information is displayed as a sponsored link.
If you want to locat pdf files in google, you can use the google search order: filetype:pdf + keywords to locate all pdf files related to the keywords you're looking for.
Google comes up with different search snippets for the keywords targeted on one page because of the different page ranks.
Google AdWords uses several tools to test keywords on websites. First, they use comparison tools to get related links added to a website. They also send emails through Google Plus with exclusive offers.