BPSC TRE – Java Programming & OOP Concepts

BPSC TRE – Java Programming & OOP Concepts | Test 1

Questions 31-35 of 50

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Question 31

MCQ · Single Correct 1 mark

What is a Marker Interface in Java?

A An interface that contains no fields and no methods, used to deliver metadata signal to JVM (e.g., Serializable) B An interface containing only private static helper methods C An interface that marks a class as deprecated for deletion D More than one of the above E None of the above

Question 32

MCQ · Single Correct 1 mark

Which non-access modifier in Java prevents an instance field from being serialized when an object is saved?

A transient B static C volatile D More than one of the above E None of the above

Question 33

MCQ · Single Correct 1 mark

What is the purpose of the 'volatile' keyword in Java multithreading?

A It guarantees that reads/writes to a variable go directly to main memory, ensuring thread visibility B It marks a thread for immediate termination by Garbage Collector C It locks the method execution so only one thread can enter at a time D More than one of the above E None of the above

Question 34

MCQ · Single Correct 1 mark

Which Collection interface implementation in Java maintains elements in insertion order and allows duplicates?

A ArrayList B HashSet C TreeSet D More than one of the above E None of the above

Question 35

MCQ · Single Correct 1 mark

Which Set collection implementation in Java guarantees that elements are sorted in natural ascending order or via a Comparator?

A TreeSet B LinkedHashSet C HashSet D More than one of the above E None of the above