Java Online Quiz
Following quiz provides Multiple Choice Questions (MCQs) related to Core Java. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.
Q 1 - What of the following is the default value of an instance variable?
Answer : C
Explaination
Instance variables are assigned default values based on their types. For example, int variable is assigned 0 and an object type variable is assigned null as default value.
Answer : C
Explaination
The short data type is represented by 16-bit signed two's complement integer.
Minimum value: -32,768
Maximum value: 32,767
Answer : C
Explaination
String variable has default value of null if defined as an instance/static variable.
Q 4 - Which of the following is false about String?
B - String can be created using new operator.
Answer : C
Explaination
String is a object.
Answer : B
Explaination
Inheritance represets IS-A relationship providing code reusablity . Consider the following statement: Circle is a Shape. Here Shape is super class and Circle is a child class extends the super class Shape.
Answer : B
Explaination
No, this is not possible.
Q 7 - Static binding uses which information for binding?
Answer : A
Explaination
Static binding uses type information for binding.
Q 8 - What happens when thread's sleep() method is called?
A - Thread returns to the ready state.
Answer : B
Explaination
When a task invokes its sleep() method, it returns to the waiting state.
Answer : A
Explaination
Deletion in linked list is fast because it involves only updating the next pointer in the node before the deleted node and updating the previous pointer in the node after the deleted node.
Q 10 - Which of the following is a marker interface?
Answer : A
Explaination
serializable is a marker interface.
