Answer: D) Silver lodide Explanation:

Answer: D) 144 Explanation: Given ratio of pens and pencils = 3 :2 Number of Pens = 3x Number of Pencils = 2x Average number of pencils & Pens = 3x + 2x2 = 180 5x = 360 => x = 72 Hence, the number of pencils = 2x = 72 x 2 = 144.

Answer: A) LIKE operator Explanation: LIKE is a keyword that is used in the WHERE clause. Basically, LIKE allows us to do a search based operation on a pattern rather than specifying exactly what is desired (as in IN) or spell out a range (as in BETWEEN).   The syntax is as follows:SELECT "column_name"FROM "table_name"WHERE "column_name" LIKE {PATTERN}   {PATTERN} often consists of wildcards.   In SQL, there are two wildcards: % (percent sign) represents zero, one, or more characters. _ (underscore) represents exactly one character.   More :: Certification Questions on SQL