In case of emergency, evacuation plan with display on prominent places should be present and all employees must be aware about the evacuation plan ?

absolutely yes.  every person has a right to know the egress incase of emergencies and your HSE department has a responsibility to do so.  its basic HSE planning

THIS IS ESSENTIAL. IF ANY LESSONS ARE TO BE LEARNED YOU ONLY NEED TO LISTEN TO THE NEWS TO SEE HOW INCIDENTS HAPPEN AND DUE TO THE LACK OF SAFETY MEASURES PEOPLE ARE SADLY KILLED AND SERIOUSLY HURT. WE NEED TO ALWAYS WORK ON THE PRINCIPAL THAT PREVENTION IOS BETTER THAN THE CURE.

Yes. the plan should be displayed visibly and should be in access of all employees. a safety awareness meeting and practice drill for safe exit will help to keep all the employees safe.

You are correct Mr. Mahmood. Or else, we can't ensure that all our employees are in safe working environment. Knowing in detail about the safety measures during emergency occurrences - that too when drilled and practiced ones - is a great aspect of safety, encouragement and collaboration.