The best way of learning interview questions is to give it a shot.

Here's the relevant syntax from Books Online (from the article on CREATE TABLE):

[ CONSTRAINT constraint_name ]

{ { PRIMARY KEY | UNIQUE }

[ CLUSTERED | NONCLUSTERED ]

[

WITH FILLFACTOR = fillfactor

| WITH ( < index_option > [ , ...n ] )

]

[ ON { partition_scheme_name ( partition_column_name )

| filegroup | "default" } ]

| [ FOREIGN KEY ]

REFERENCES [ schema_name . ] referenced_table_name [ ( ref_column ) ]

[ ON DELETE { NO ACTION | CASCADE | SET NULL | SET DEFAULT } ]

[ ON UPDATE { NO ACTION | CASCADE | SET NULL | SET DEFAULT } ]

[ NOT FOR REPLICATION ]

| CHECK [ NOT FOR REPLICATION ] ( logical_expression )

}

Here's another fun question - what's the difference between a primary key and any other unique key, regardless of whether it's clustered or not?