Search engine optimization (SEO) Interview Questions And Answers

I'd pick the low-hanging fruit. Eliminate excess (graphics, multimedia), cut your prose in half, and optimize the rest. (you could install mod_gzip etc. in less than an hour also). The main thing is to make sure that your home page loads quickly.
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Yes, CSS has made it possible to transform table-based layouts into CSS-based layouts. Typically this reduces page size by 25 to 50%. The ratio of content to markup improves dramatically.

This is akin to asking what is the ROI for usability. Speed is a key component of usability. Small improvements in speed can take critical pages below typical attention thresholds, and dramatically lower bail-out rates and abandoned shopping carts. I talk about this in the book, but compression alone can save 30-50% in size and bandwidth costs. Webmasters who have employed compression and optimization typically save 30 to 50% off their bandwidth costs, and retain more customers, and have improved conversion rates.

Yes, I have read that. That is poorly supported elsewhere, I spend the first chapter showing why response times are important, summarizing key research into HCI and response times. However, there are factors that can affect how we perceive delays, like feedback and task complexity. Attainability is another interesting area of research, with users adjusting "subjective time bases" based on the pace of particular systems. If Domino's usually delivers in under 30 minutes, and then one day took an hour, you'd certainly notice it.
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As far as I'm concerned, no. But according to the response time research that I read, and mention briefly in the book, you can have response times that are too fast, and this increases errors. But on the web, that is unlikely to happen anytime soon.
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Many of the weblogs I view source have lots of embedded formatting, like font tags and complex CSS classes. Many weblogs are also by their very nature verbose :) I'd advocate using higher-level type selectors in CSS, contextual selectors, and to be brief in decks and point to longer stories for those who want to read more. Writing succinct headlines is also important.

In general, cut your prose as much as possible, especially on high-traffic pages. Users don't read as fast on the screen. On the web, users are information foraging, trying to maximize the value of their time. They flit about like hummingbirds, looking for nuggets that interest them. One study I read showed that on average, users spend about 1 second per page, and rarely stay more than 10 seconds. Once they find an article they want, they'll stay longer.
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Yes, this is also called coding motion out of loops, and is one of Bentley's 27 rules for code tuning. Also, using local variables is much faster. Many of these refactorings are covered in Chapter 10, "Optimizing JavaScript for Execution Speed."

I don't advocate making your entire HTML page into one single line. Some editors can choke on long lines, older versions of the Oracle info server can choke on long lines, and if you email your pages (as we do at webref), some email programs can flag a virus in longer lines. So I advocate a max of 255 character lines to be safe, or a max of 2000 character lines to avoid problems with Oracle. Also, removing whitespace can break some JavaScript code, and make your code hard to read. You can avoid these problems by keeping unoptimized versions for any edits, and punctuating your JavaScript statements with semicolons.
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Too many HTTP requests. This is due to the overuse of images and external files. We're also seeing a trend of too many external JavaScript and CSS files in the HEAD. This delays the display of your content as they must load first.

Yahoo.com has the most highly optimized home page I have seen. They use URL abbreviation to save nearly 30% off their home page HTML. View source to see what I mean. But even Yahoo has bloated up, they have nearly 300 links on their front page. WebReference.com of course :) I like most anything from Zeldman and company, very clean and CSS-based. Though there's always room for improvement.
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Yes, there are a number of products, mainly for optimizing HTML and JavaScript. SpaceAgent from Insider Software, VSE Web Site Turbo from VSE Online, and of course automated graphical tools. I test and demonstrate many of these products in the book. To convert to CSS-based layouts, and to do it right, you've got to do it manually.

It depends on the type of site. For informational sites like GlobalGuideLine.com or news-related sites, the graphics should be kept to a minimum. With the advent of widespread support of CSS, you can now create many pleasing effects without graphics. I cite a study in the book on this ratio. For shorter delays users prefer documents that include graphics, for longer delays users prefer text-only documents.
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Yes, there is a tradeoff for some techniques between IA and WSO, and with Search Engine Optimization (SEO). Good IA has a logical hierarchy and clear, unambiguous labels. Some WSO techniques uses short abbreviated names and URLs to achieve savings, which can preclude descriptive terms. SEO also can conflict with IA and WSO, with some sites sacrificing logical hierarchy to create keyword-filled directory and file names. Balancing these three disciplines is an art in itself. For high traffic pages like home pages, I favor speed over IA and SEO. In the book, I discuss mapping techniques that you can use to have the best of both worlds. The book gives you the tools you can use to optimize your content. How far you go is up to you.

I have not seen any studies specific to this, although I have some observations. I assume you mean for readability and usability, and not for SEO. For a multipage article, we found at GlobalGuideLine.com that page views dropped off dramatically after 4 or 5 pages. When we made an article longer, fewer people read pages 6 or higher. Also, page length is related to page size, and without feedback you need to make sure your pages load in at most 8 to 10 seconds. That is about 30 to 34K total. With a 10K banner and a logo say, that is a maximum of 20K.

► A. 20% of the WebPages of the website have been indexed by the search engine
► B. Only 20% of the pages of the website will be indexed by the search engine
► C. 20% of the websites pages will never be indexed
► D. The website ranks in the first 20% of all websites indexed by the search engine for its most important search terms

B. Only 20% of the pages of the website will be indexed by the search engine

► A. less than 30%
► B. 30 percent
► C. more than 30%

A. More than 30%

► a. The total number of inbound links to a page of a web site
► b. The subject matter of the site providing the inbound link to a page of a web site
► c. The text used to describe the inbound link to a page of a web site
► d. The number of outbound links on the page that contains the inbound link to a page of a web site

d. The number of outbound links on the page that contains the inbound link to a page of a web site

► A. Not Modified
► B. Moved Permanently
► C. syntax error in the request
► D. Payment is required
► E. The request must be authorized before it can take place

B. Moved Permanently

► a. It will open up the Google help pages applicable to www.globalguideline.com.com/seo
► b. It will find pages about help within www.globalguideline.com.com/seo
► c. It will only find page titles about help within www.globalguideline.com.com/seo
► d. It will direct you to the request page for re-indexing of www.globalguideline.com.com/seo

a. It will open up the Google help pages applicable to www.globalguideline.com.com/seo

► a. It is the main body of text on a particular web page
► b. It is the text within the left or top panel of a web page
► c. It is the visible text that is hyperactive linked to another page
► d. It is the most prominent text on the page that the search engines use to assign a title to the page

c. It is the visible text that is hyperactive linked to another page

► a. Waves
► b. Flux
► c. Shuffling
► d. Swaying

b. Flux

► a. Yes
► b. No

b. No

► a. It refers to the fact that the importance of choosing high traffic keywords leads to the best return on investment
► b. It refers to the importance attached to getting the right keyword density
► c. It refers to the fact that the keywords placed in important parts of a webpage are given priority by the search engines
► d. It refers to the fact that the keywords in bold font are given priority by the search engines

c. It refers to the fact that the keywords placed in important parts of a webpage are given priority by the search engines.

► a. Red hat techniques
► b. Silver hat techniques
► c. Grey hat techniques
► d. Shady hat techniques

c. Grey hat techniques

► a. They are two-way links (reciprocal links)
► b. They are from authority websites
► c. They are voluntary in nature
► d. They are from .edu or .gov extension websites

a. They are two-way links (reciprocal links)