Quiz for Memory Management & Garbage Collection

Q1: What is the purpose of garbage collection in Java?

A. To delete unused files B. To manage memory manually C. To reclaim memory occupied by unreachable objects D. To close database connections

Q2: Which part of memory is managed by the garbage collector?

A. Stack B. Heap C. Registers D. Code Segment

Q3: Which method is used to suggest garbage collection in Java?

A. System.exit() B. System.gc() C. Runtime.destroy() D. Memory.gc()

Q4: Which memory area stores method local variables?

A. Heap B. Stack C. PermGen D. Code Cache

Q5: What triggers garbage collection in Java?

A. Low disk space B. When object becomes final C. When object is no longer referenced D. Calling finalize()

Q6: Which algorithm is commonly used in Java garbage collection?

A. FIFO B. Round-robin C. Mark and Sweep D. Quick Sort

Q7: What does the finalize() method do?

A. Immediately destroys object B. Closes the JVM C. Prepares object for GC D. Allocates memory

Q8: What is the role of the JVM in memory management?

A. Manage user sessions B. Compile Java code C. Allocate and manage memory D. Generate reports

Q9: Which Java keyword makes a variable reference null?

A. delete B. nullify C. unset D. null

Q10: Which area of memory holds class metadata in Java 8 and later?

A. PermGen B. MetaSpace C. Heap D. Stack

Q11: Which command-line option sets the initial heap size in Java?

A. -Xss B. -Xmx C. -Xms D. -Xinc

Q12: What is the result of a memory leak in Java?

A. Faster performance B. Improved security C. OutOfMemoryError D. Compile-time error

Q13: Which type of reference is cleared only when memory is absolutely needed?

A. SoftReference B. WeakReference C. PhantomReference D. HardReference

Q14: Which reference type is collected eagerly by GC?

A. SoftReference B. WeakReference C. StrongReference D. StaticReference

Q15: How can circular references affect garbage collection?

A. They prevent GC B. They delay object creation C. They are automatically handled D. They cause compilation error

Q16: Which GC is most suitable for large heap and low pause time?

A. Serial GC B. Parallel GC C. G1 GC D. CMS GC

Q17: Which JVM option is used to print GC logs?

A. -Xloggc B. -XX:LogFile C. -verbosegc D. -printGC

Q18: Which JVM memory section is shared among threads?

A. Stack B. Heap C. Registers D. Program Counter

Q19: What is the size limit of stack memory?

A. Fixed by JVM and OS B. Unlimited C. 512MB D. 64GB

Q20: Which generation in heap memory stores newly created objects?

A. Old Generation B. Young Generation C. Permanent Generation D. Tenured Generation