Question : What is primary key. Choose from the options given below - 

Option 1: A Primary key is a field or a combination of fields that can uniquely identify a row/tuple in a table/relation.

Option 2: A Primary key in table/relation is any non-primary key field which also stores unique values for each row just like a primary-key does. But only one key is designated as primary key. So unique refers to a unique non-key field of a table.

Option 3: A Primary key is a field of a table which is the primary key of another table through a foreign key a relationship is established between two tables.

Option 4: None of the above

Question : Agriculture, mining, quarrying, etc are the example of ___ sector.
 

Option 1: Primary 
 

Option 2: Secondary
 

Option 3: Teritary
 

Option 4: None of the above.
 

Question : Trade, transport and storage, etc., are the example of ______ sector.
 

Option 1: Primary 
 

Option 2: Secondary
 

Option 3: Teritary
 

Option 4: None of the above.
 

Question : Manufacturing electricity, gases, construction, etc are the example of ____ sector.
 

Option 1: Primary 
 

Option 2: Secondary
 

Option 3: Teritary
 

Option 4: None of the above.
 

Question : Medium of exchange is ……… function of money. 
 

Option 1: Primary function 
 

Option 2: Secondary function 
 

Option 3: Common function 
 

Option 4: None of the above