C Sharp Polymorphism Questions and Answers

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Showing 10 of 15 questions
Q11
Which of the following modifier is used when a virtual method is redefined by a derived class?
  • A overloads
  • B override
  • C overridable
  • D virtual
Answer: Option B
Q12
In order for an instance of a derived class to completely take over a class member from a base class, the base class has to declare that member as
  • A new
  • B base
  • C virtual
  • D overrides
Answer: Option C
Q13
Which of the following can be declared as a virtual in a class?     Methods     Properties     Events     Fields     Static fields
  • A 1, 2, 3
  • B 3, 5
  • C 2, 4
  • D 2, 3, 5
Answer: Option A
Q14
Which of the following statements is correct?
  • A Only one object can be created from an abstract class.
  • B By default methods are virtual.
  • C If a derived class does not provide its own version of virtual method then the one in the base class is used
  • D If the method in the derived class is not preceded by override keywords, the compiler will issue a warning and the method will behave as if the override keyword were present.
Answer: Option C
Q15
Which of the following are necessary for Run-time Polymorphism?     The overridden base method must be virtual, abstract or override.     Both the override method and the virtual method must have the same access level modifier.     An override declaration can change the accessibility of the virtual method.     An abstract inherited property cannot be overridden in a derived class.     An abstract method is implicitly a virtual method.
  • A 1, 3
  • B 1, 2, 5
  • C 2, 3, 4
  • D 4 only
Answer: Option B

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