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Correct.

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Correct. The asterisk or * is a commonly used truncation symbol in many databases.

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Try again, because this searches for records containing the ideas of polystyrene and landfill or landfills as well as packing or packaging.

Try again, as this search is valid.

Try again. This search produces results.

Correct because 2 different wild cards cannot be used in the search term.

Correct. Compendex is a general engineering database while Scopus is a multi-disciplinary database that covers engineering, technology and the sciences along with other fields.

Try again. These databases would be mainly relevant to electrical and electronic engineering.

Try again. These databases would be mainly relevent to civil engineering only.

Try again. FSTA is a food database and CINDAS is a materials' properties database.

Try again. This will search preselected engineering databases which may or may not be relevant to your specific topic.

Try again. This will search for the keyword 'engineering'.

Try again. This will not limit your search to engineering databases.

Correct. The custom search allows you to select which engineering databases you would like to search simultaneously. This means you can select the ones most relevant to your topic.

Correct. Using the OR operator, the truncation sign, and more synonyms usually increases the number of search hits.

Try again. The NOT and AND operators reduce the number of search hits.

Try again. The AND oprators reduce the number of search hits.

Try again. The AND operator reduces the number of hits.