Q$9.$ Which of the following statements about data structures is false?

A$.$ A Set is a collection that does not contain duplicates

B$.$ A List is a ordered collection that can contain duplicates

C$.$ Maps contain keys and values from which keys can be duplicate

D$.$ Queue is typically a first$-$in$,$ first$-$out collection

Q$10.$ What result will be returned when the following code is run?A$.$ RedB. YellowC. GreenD. Blue

Q$11.$ Which primitive type$-$wrapper class pairing is false?

A$.$ string$-$String

B$.$ int$-$Integer

C$.$ double$-$Double

D$.$ char$-$Character

Q$12.$ Which is not one of the Java File operation methods?

A$.$ delete

B$.$ read

C$.$ write

D$.$ createFile

Q$13.$ Which Java File operation method is described incorrectly?

A$.$ canRead$()$: tests whether the file is readable or not

B$.$ getName$()$: returns the name of the file

C$.$ length $()$: returns the number of characters in the file

D$.$ mkdir$()$: creates a directory

Q$14.$ Which usage is false for the following line of code?

File file $=$ new File$("$filename$.$txt$")$;

A$.$ file.list$)$;

B$.$ file.getAbsolutePath$()$;

C$.$ file.exists$()$;

D$.$ file.size$()$;

Q$15.$ Which visibility notation of UML is not given correctly?

A$.+$ for public $($visible to all classes$)$

B$.-$ for private $($visible only within the class$)$

C$.$ & for protected $($visible to subclasses$)$

D$.$ for package or default visibility

Q$16.$ Which statement about UML diagrams is incorrect?

A$.$ UML is programming$-$language independent

B$.$ UML is a standard graphical language for modeling object$-$oriented systems

C$.$ Class methods and fields are indicated by underlining

D$.$ Constructor is modeled in the second compartment of UML