136.
Constructor and destructor methods have no . . . . . . and are called automatically - they cannot be called explicitly and consequently their declarations need no access specifier. 

138.
You can invoke class constructors that don’t have any relation to the instantiated object by simply prefacing _constructor with the class name like.

139.
 . . . . . . is a class which can only be instantiated once. You can effectively only have one object per . . . . . class in an application.

Read More Section(Object Oriented Concept)

Each Section contains maximum 100 MCQs question on Object Oriented Concept. To get more questions visit other sections.