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Quiz on Garbage Collection in Java

by Quiz Orbit Team

Garbage Collection in Java is an automatic memory management process where the Java Virtual Machine (JVM) reclaims memory used by objects no longer in use. This helps prevent memory leaks and ensures efficient resource utilization in Java applications.

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Question 1 of 15
1. Question
What is the main purpose of Garbage Collection in Java?
- Managing file resources
- Closing database connections
- Reclaiming memory used by unreachable objects
- Allocating new objects
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Question 2 of 15
2. Question
Which JVM memory area is garbage collected?
- Stack
- Heap
- Method Area
- Registers
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Question 3 of 15
3. Question
Which class is associated with requesting garbage collection?
- Object
- System
- Runtime
- Both B and C
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Question 4 of 15
4. Question
Can the programmer force garbage collection in Java?
- Yes
- No
- Only in JDK 1.6
- Only with external tools
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Question 5 of 15
5. Question
What does finalize() method do in Java?
- Initializes an object
- Terminates a thread
- Is called before an object is garbage collected
- Compiles the class
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Question 6 of 15
6. Question
When is an object eligible for garbage collection?
- When no reference points to it
- When it is marked final
- When the JVM starts
- After 60 seconds of inactivity
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Question 7 of 15
7. Question
Which of the following will make an object eligible for GC?
- obj = null;
- Exiting the method where the object is created
- A and B
- Assigning obj to another reference
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Question 8 of 15
8. Question
Which JVM algorithm identifies unreachable objects?
- Mark and Collect
- Reference Counting
- Mark and Sweep
- Memory Scanning
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Question 9 of 15
9. Question
What does the “mark” phase in Mark-and-Sweep do?
- Deletes objects
- Highlights used objects
- Marks unused memory
- Compacts memory
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Question 10 of 15
10. Question
Is garbage collection guaranteed to run when System.gc() is called?
- Yes
- No
- Only on Linux
- Depends on memory size
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Question 11 of 15
11. Question
What happens if you override the finalize() method improperly?
- Compile-time error
- JVM crash
- Potential memory leak
- Nothing changes
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Question 12 of 15
12. Question
Which garbage collector is best for applications with large heap sizes?
- Serial GC
- CMS GC
- G1 GC
- G1 GC
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Question 13 of 15
13. Question
What is the role of GC root in Java?
- Stores JVM memory info
- Entry point for reachability
- Tracks file streams
- Deletes threads
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Question 14 of 15
14. Question
Which of the following is NOT a valid garbage collector in Java?
- G1 GC
- CMS GC
- Mark-and-Compact GC
- Queue GC
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Question 15 of 15
15. Question
Which memory issue is avoided using garbage collection?
- StackOverflowError
- Memory Leak
- ArrayIndexOutOfBounds
- Compilation error
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Summary

Java Garbage Collection helps automatically manage memory, improve application performance, and reduce memory leaks. Concepts like heap memory, object reachability, and GC algorithms like Mark-and-Sweep are critical for writing efficient Java applications.

Tags: java garbage collection quiz Java quiz java quiz on garbage collection quiz on garbage collection in java \quiz on java garbage collection

Quiz Orbit Team

At QuizOrbit, our team specializes in fun, informative quizzes across topics like general knowledge, technology, and entertainment. Boost your knowledge with our expert-designed quizzes.

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