Interfaces MCQ

Test your knowledge with important Interfaces MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Interfaces MCQs at Bissoy

• Can “abstract” keyword be used with constructor, Initialization Block, Instance Initialization and Static Initialization Block.
  ক

  True

  খ

  False
• What happens when we access the same variable defined in two interfaces implemented by the same class?
  ক

  Compilation failure

  খ

  Runtime Exception

  গ

  The JVM is not able to identify the correct variable

  ঘ

  The interfaceName.variableName needs to be defined
• What happens when a constructor is defined for an interface?
  ক

  Compilation failure

  খ

  Runtime Exception

  গ

  The interface compiles successfully

  ঘ

  The implementing class will throw exception
• What will happen if we provide concrete implementation of method in interface?
  ক

  The concrete class implementing that method need not provide implementation of that method

  খ

  Runtime exception is thrown

  গ

  Compilation failure

  ঘ

  Method not found exception is thrown
• What type of methods an interface contain by default?
  ক

  abstract

  খ

  static

  গ

  final

  ঘ

  private
• What does an interface contain?
  ক

  Method definition

  খ

  Method declaration

  গ

  Method declaration and definition

  ঘ

  Method name
• What type of variable can be defined in an interface?
  ক

  public static

  খ

  private final

  গ

  public final

  ঘ

  static final
• All methods must be implemented of an interface.
  ক

  True

  খ

  False
• Which of the following is the correct way of implementing an interface A by class B?
  ক

  class B extends A{}

  খ

  class B implements A{}

  গ

  class B imports A{}

  ঘ

  None of the mentioned
• Which of the following access specifiers can be used for an interface?
  ক

  Protected

  খ

  Private

  গ

  Public

  ঘ

  Public, protected, private
• Which of the following is the correct way of implementing an interface salary by class manager?
  ক

  class manager extends salary {}

  খ

  class manager implements salary {}

  গ

  class manager imports salary {}

  ঘ

  none of the mentioned
• Which of these keywords is used by a class to use an interface defined previously?
  ক

  import

  খ

  Import

  গ

  implements

  ঘ

  Implements
• Which of these access specifiers can be used for an interface?
  ক

  Public

  খ

  Protected

  গ

  private

  ঘ

  All of the mentioned