no difference...scope is scope and objective is objective

Objective:  The main intension of the document or seminor  
etc
Scope:It is perticular task to be complete

Hai every body,

Scope :It defines the NEED of the project.

Objective :It defined the PURPOSE of the project.

I will explain in details.

NEED in the sense,It controls and improve the quality of s/w.
PURPOSE in the sense,To find the defects in the developed s/w

The objective is the goal or purpose of the project.
The scope is the way or the plan to get there.

Objective states whole purpose of the project
Scope states how to execute the plan and limitations, if any

Objective defines "what is the purpose of testing" ex:the 
objective is to validate the functionality of the XYZ 
application

Scope defines the boundaries of testing, what will be 
tested and what will not be tested.

very simple

for ex let us consider a project

objective : project shouild be completed within 1 month

scope : chances of finishing the project in 1 month.

Objective is Goal/Final aim what you are doing

Scope is boundaries/limitations of your testing beyond that 
you can do testing. Lets say in Regression testing you 
can't do stress/load testing. that is your scope of 
regression testing.

Project scope = what is included and what is excluded in 
this project

Project objective = what you hope to accomplish by 
implementing this project

Scope of the project gives the outlook 

and objective how to get it accomplished

objective is what you are going to do.
and scope is what you can do further`