C# Memory Management MCQ Questions with Answers – Page 2 (Latest 2026)

Q51. Which statement about ArrayPool<T> is most accurate?

A. A native pool. B. Reuse arrays to reduce allocations. C. A constant pool. D. A LINQ source.

Select an answer to check.

Answer: Reuse arrays to reduce allocations.

Here, Reuse arrays to reduce allocations. is the right choice. Rent/Return arrays. It aligns directly with what the question asks about which statement about arraypool<t> is most accurate. Competing choices sound plausible, but they miss the key condition.

Q52. How is ArrayPool<T> best characterized?

A. A LINQ source. B. A native pool. C. Reuse arrays to reduce allocations. D. A constant pool.

Select an answer to check.

Answer: Reuse arrays to reduce allocations.

In this case, Reuse arrays to reduce allocations. is correct. Rent/Return arrays. It aligns directly with what the question asks about how is arraypool<t> best characterized. Competing choices sound plausible, but they miss the key condition.

Q53. Which option best describes MemoryPool<T> in C#/.NET?

A. A logging pool. B. Pool of Memory<T> backed by reusable buffers. C. A reflection cache. D. A delegate pool.

Select an answer to check.

Answer: Pool of Memory<T> backed by reusable buffers.

The best option here is Pool of Memory<T> backed by reusable buffers.. Reduces GC pressure. It aligns directly with what the question asks about which option best describes memorypool<t> in c#/.net. Competing choices sound plausible, but they miss the key condition.

Q54. What is the primary purpose of MemoryPool<T>?

A. A delegate pool. B. A logging pool. C. A reflection cache. D. Pool of Memory<T> backed by reusable buffers.

Select an answer to check.

Answer: Pool of Memory<T> backed by reusable buffers.

For this question, Pool of Memory<T> backed by reusable buffers. is correct. Reduces GC pressure. It aligns directly with what the question asks about what is the primary purpose of memorypool<t>. Competing choices sound plausible, but they miss the key condition.

Q55. Which statement about MemoryPool<T> is most accurate?

A. A logging pool. B. Pool of Memory<T> backed by reusable buffers. C. A reflection cache. D. A delegate pool.

Select an answer to check.

Answer: Pool of Memory<T> backed by reusable buffers.

Pool of Memory<T> backed by reusable buffers. is the correct answer here. Reduces GC pressure. It aligns directly with what the question asks about which statement about memorypool<t> is most accurate. Competing choices sound plausible, but they miss the key condition.

Q56. How is MemoryPool<T> best characterized?

A. A delegate pool. B. Pool of Memory<T> backed by reusable buffers. C. A logging pool. D. A reflection cache.

Select an answer to check.

Answer: Pool of Memory<T> backed by reusable buffers.

Here, Pool of Memory<T> backed by reusable buffers. is the right choice. Reduces GC pressure. This matches the core idea being tested around how is memorypool<t> best characterized. Competing choices sound plausible, but they miss the key condition.

Q57. Which option best describes stackalloc in C#/.NET?

A. Allocate small arrays on the stack. B. A reflection method. C. A pool rental. D. Heap allocation always.

Select an answer to check.

Answer: Allocate small arrays on the stack.

In this case, Allocate small arrays on the stack. is correct. Limited size; use Span. This matches the core idea being tested around which option best describes stackalloc in c#/.net. Competing choices sound plausible, but they miss the key condition.

Q58. What is the primary purpose of stackalloc?

A. Heap allocation always. B. A pool rental. C. A reflection method. D. Allocate small arrays on the stack.

Select an answer to check.

Answer: Allocate small arrays on the stack.

The best option here is Allocate small arrays on the stack.. Limited size; use Span. This matches the core idea being tested around what is the primary purpose of stackalloc. Competing choices sound plausible, but they miss the key condition.

Q59. Which statement about stackalloc is most accurate?

A. Heap allocation always. B. A reflection method. C. A pool rental. D. Allocate small arrays on the stack.

Select an answer to check.

Answer: Allocate small arrays on the stack.

For this question, Allocate small arrays on the stack. is correct. Limited size; use Span. This matches the core idea being tested around which statement about stackalloc is most accurate. Competing choices sound plausible, but they miss the key condition.

Q60. How is stackalloc best characterized?

A. A pool rental. B. Heap allocation always. C. Allocate small arrays on the stack. D. A reflection method.

Select an answer to check.

Answer: Allocate small arrays on the stack.

Allocate small arrays on the stack. is the correct answer here. Limited size; use Span. This matches the core idea being tested around how is stackalloc best characterized. Competing choices sound plausible, but they miss the key condition.

Q61. Which option best describes ref struct in C#/.NET?

A. Stack-only struct (e.g., Span<T>). B. An interface. C. A heap-only class. D. A delegate.

Select an answer to check.

Answer: Stack-only struct (e.g., Span<T>).

Here, Stack-only struct (e.g., Span<T>). is the right choice. Cannot be boxed. That is exactly the concept behind which option best describes ref struct in c#/.net in this context. Competing choices sound plausible, but they miss the key condition.

Q62. What is the primary purpose of ref struct?

A. An interface. B. A heap-only class. C. Stack-only struct (e.g., Span<T>). D. A delegate.

Select an answer to check.

Answer: Stack-only struct (e.g., Span<T>).

In this case, Stack-only struct (e.g., Span<T>). is correct. Cannot be boxed. That is exactly the concept behind what is the primary purpose of ref struct in this context. Competing choices sound plausible, but they miss the key condition.

Q63. Which statement about ref struct is most accurate?

A. A delegate. B. Stack-only struct (e.g., Span<T>). C. A heap-only class. D. An interface.

Select an answer to check.

Answer: Stack-only struct (e.g., Span<T>).

The best option here is Stack-only struct (e.g., Span<T>).. Cannot be boxed. That is exactly the concept behind which statement about ref struct is most accurate in this context. Competing choices sound plausible, but they miss the key condition.

Q64. How is ref struct best characterized?

A. A delegate. B. An interface. C. A heap-only class. D. Stack-only struct (e.g., Span<T>).

Select an answer to check.

Answer: Stack-only struct (e.g., Span<T>).

For this question, Stack-only struct (e.g., Span<T>). is correct. Cannot be boxed. That is exactly the concept behind how is ref struct best characterized in this context. Competing choices sound plausible, but they miss the key condition.

Q65. Which option best describes readonly struct in C#/.NET?

A. An interface. B. Immutable value type optimization. C. A delegate. D. A class with all readonly fields.

Select an answer to check.

Answer: Immutable value type optimization.

Immutable value type optimization. is the correct answer here. Avoids defensive copies. That is exactly the concept behind which option best describes readonly struct in c#/.net in this context. Competing choices sound plausible, but they miss the key condition.

Q66. What is the primary purpose of readonly struct?

A. A delegate. B. Immutable value type optimization. C. A class with all readonly fields. D. An interface.

Select an answer to check.

Answer: Immutable value type optimization.

Here, Immutable value type optimization. is the right choice. Avoids defensive copies. It fits the requirement in the prompt about what is the primary purpose of readonly struct. Competing choices sound plausible, but they miss the key condition.

Q67. Which statement about readonly struct is most accurate?

A. Immutable value type optimization. B. A class with all readonly fields. C. An interface. D. A delegate.

Select an answer to check.

Answer: Immutable value type optimization.

In this case, Immutable value type optimization. is correct. Avoids defensive copies. It fits the requirement in the prompt about which statement about readonly struct is most accurate. Competing choices sound plausible, but they miss the key condition.

Q68. How is readonly struct best characterized?

A. A class with all readonly fields. B. Immutable value type optimization. C. A delegate. D. An interface.

Select an answer to check.

Answer: Immutable value type optimization.

The best option here is Immutable value type optimization.. Avoids defensive copies. It fits the requirement in the prompt about how is readonly struct best characterized. Competing choices sound plausible, but they miss the key condition.

Q69. Which option best describes GC.Collect in C#/.NET?

A. Disables finalizers. B. Increases GC heap size. C. Forces a GC; usually shouldn't be called. D. Resets GC stats only.

Select an answer to check.

Answer: Forces a GC; usually shouldn't be called.

For this question, Forces a GC; usually shouldn't be called. is correct. Rarely needed in app code. It fits the requirement in the prompt about which option best describes gc.collect in c#/.net. Competing choices sound plausible, but they miss the key condition.

Q70. What is the primary purpose of GC.Collect?

A. Resets GC stats only. B. Disables finalizers. C. Forces a GC; usually shouldn't be called. D. Increases GC heap size.

Select an answer to check.

Answer: Forces a GC; usually shouldn't be called.

Forces a GC; usually shouldn't be called. is the correct answer here. Rarely needed in app code. It fits the requirement in the prompt about what is the primary purpose of gc.collect. Competing choices sound plausible, but they miss the key condition.

Q71. Which statement about GC.Collect is most accurate?

A. Increases GC heap size. B. Disables finalizers. C. Forces a GC; usually shouldn't be called. D. Resets GC stats only.

Select an answer to check.

Answer: Forces a GC; usually shouldn't be called.

Here, Forces a GC; usually shouldn't be called. is the right choice. Rarely needed in app code. This is the most accurate statement for which statement about gc.collect is most accurate. Competing choices sound plausible, but they miss the key condition.

Q72. How is GC.Collect best characterized?

A. Resets GC stats only. B. Disables finalizers. C. Increases GC heap size. D. Forces a GC; usually shouldn't be called.

Select an answer to check.

Answer: Forces a GC; usually shouldn't be called.

In this case, Forces a GC; usually shouldn't be called. is correct. Rarely needed in app code. This is the most accurate statement for how is gc.collect best characterized. Competing choices sound plausible, but they miss the key condition.

Q73. Which option best describes WeakReference<T> in C#/.NET?

A. A static field. B. A pinned handle. C. Reference that doesn't prevent collection. D. A strong reference.

Select an answer to check.

Answer: Reference that doesn't prevent collection.

The best option here is Reference that doesn't prevent collection.. Used for caches/event subscriptions. This is the most accurate statement for which option best describes weakreference<t> in c#/.net. Competing choices sound plausible, but they miss the key condition.

Q74. What is the primary purpose of WeakReference<T>?

A. A pinned handle. B. Reference that doesn't prevent collection. C. A strong reference. D. A static field.

Select an answer to check.

Answer: Reference that doesn't prevent collection.

For this question, Reference that doesn't prevent collection. is correct. Used for caches/event subscriptions. This is the most accurate statement for what is the primary purpose of weakreference<t>. Competing choices sound plausible, but they miss the key condition.

Q75. Which statement about WeakReference<T> is most accurate?

A. A static field. B. A strong reference. C. Reference that doesn't prevent collection. D. A pinned handle.

Select an answer to check.

Answer: Reference that doesn't prevent collection.

Reference that doesn't prevent collection. is the correct answer here. Used for caches/event subscriptions. This is the most accurate statement for which statement about weakreference<t> is most accurate. Competing choices sound plausible, but they miss the key condition.

Q76. How is WeakReference<T> best characterized?

A. A pinned handle. B. A strong reference. C. A static field. D. Reference that doesn't prevent collection.

Select an answer to check.

Answer: Reference that doesn't prevent collection.

Here, Reference that doesn't prevent collection. is the right choice. Used for caches/event subscriptions. It aligns directly with what the question asks about how is weakreference<t> best characterized. The remaining choices fail because they don’t satisfy the full definition.

Q77. Which option best describes pinning (fixed) in C#/.NET?

A. Frees memory. B. Forces collection. C. Prevents GC from moving an object. D. Always disables GC.

Select an answer to check.

Answer: Prevents GC from moving an object.

In this case, Prevents GC from moving an object. is correct. Used in interop with native code. It aligns directly with what the question asks about which option best describes pinning (fixed) in c#/.net. The remaining choices fail because they don’t satisfy the full definition.

Q78. What is the primary purpose of pinning (fixed)?

A. Prevents GC from moving an object. B. Frees memory. C. Always disables GC. D. Forces collection.

Select an answer to check.

Answer: Prevents GC from moving an object.

The best option here is Prevents GC from moving an object.. Used in interop with native code. It aligns directly with what the question asks about what is the primary purpose of pinning (fixed). The remaining choices fail because they don’t satisfy the full definition.

Q79. Which statement about pinning (fixed) is most accurate?

A. Prevents GC from moving an object. B. Always disables GC. C. Frees memory. D. Forces collection.

Select an answer to check.

Answer: Prevents GC from moving an object.

For this question, Prevents GC from moving an object. is correct. Used in interop with native code. It aligns directly with what the question asks about which statement about pinning (fixed) is most accurate. The remaining choices fail because they don’t satisfy the full definition.

Q80. How is pinning (fixed) best characterized?

A. Forces collection. B. Frees memory. C. Always disables GC. D. Prevents GC from moving an object.

Select an answer to check.

Answer: Prevents GC from moving an object.

Prevents GC from moving an object. is the correct answer here. Used in interop with native code. It aligns directly with what the question asks about how is pinning (fixed) best characterized. The remaining choices fail because they don’t satisfy the full definition.

Q81. Which option best describes server vs workstation GC in C#/.NET?

A. Workstation is faster on servers always. B. Server has only one thread. C. Server GC is multi-threaded for throughput. D. Server uses no compaction.

Select an answer to check.

Answer: Server GC is multi-threaded for throughput.

Here, Server GC is multi-threaded for throughput. is the right choice. Configure via runtime config. This matches the core idea being tested around which option best describes server vs workstation gc. The remaining choices fail because they don’t satisfy the full definition.

Q82. What is the primary purpose of server vs workstation GC?

A. Server uses no compaction. B. Workstation is faster on servers always. C. Server GC is multi-threaded for throughput. D. Server has only one thread.

Select an answer to check.

Answer: Server GC is multi-threaded for throughput.

In this case, Server GC is multi-threaded for throughput. is correct. Configure via runtime config. This matches the core idea being tested around what is the primary purpose of server vs. The remaining choices fail because they don’t satisfy the full definition.

Q83. Which statement about server vs workstation GC is most accurate?

A. Workstation is faster on servers always. B. Server uses no compaction. C. Server GC is multi-threaded for throughput. D. Server has only one thread.

Select an answer to check.

Answer: Server GC is multi-threaded for throughput.

The best option here is Server GC is multi-threaded for throughput.. Configure via runtime config. This matches the core idea being tested around which statement about server vs workstation gc is. The remaining choices fail because they don’t satisfy the full definition.

Q84. How is server vs workstation GC best characterized?

A. Server GC is multi-threaded for throughput. B. Server uses no compaction. C. Workstation is faster on servers always. D. Server has only one thread.

Select an answer to check.

Answer: Server GC is multi-threaded for throughput.

For this question, Server GC is multi-threaded for throughput. is correct. Configure via runtime config. This matches the core idea being tested around how is server vs workstation gc best characterized. The remaining choices fail because they don’t satisfy the full definition.

Q85. Which option best describes background GC in C#/.NET?

A. Stop-the-world only. B. No GC at all. C. Concurrent collection of older generations. D. Foreground only.

Select an answer to check.

Answer: Concurrent collection of older generations.

Concurrent collection of older generations. is the correct answer here. Reduces pause times. This matches the core idea being tested around which option best describes background gc in c#/.net. The remaining choices fail because they don’t satisfy the full definition.

Q86. What is the primary purpose of background GC?

A. Foreground only. B. Stop-the-world only. C. Concurrent collection of older generations. D. No GC at all.

Select an answer to check.

Answer: Concurrent collection of older generations.

Here, Concurrent collection of older generations. is the right choice. Reduces pause times. That is exactly the concept behind what is the primary purpose of background gc in this context. The remaining choices fail because they don’t satisfy the full definition.

Q87. Which statement about background GC is most accurate?

A. No GC at all. B. Foreground only. C. Stop-the-world only. D. Concurrent collection of older generations.

Select an answer to check.

Answer: Concurrent collection of older generations.

In this case, Concurrent collection of older generations. is correct. Reduces pause times. That is exactly the concept behind which statement about background gc is most accurate in this context. The remaining choices fail because they don’t satisfy the full definition.

Q88. How is background GC best characterized?

A. No GC at all. B. Concurrent collection of older generations. C. Foreground only. D. Stop-the-world only.

Select an answer to check.

Answer: Concurrent collection of older generations.

The best option here is Concurrent collection of older generations.. Reduces pause times. That is exactly the concept behind how is background gc best characterized in this context. The remaining choices fail because they don’t satisfy the full definition.

Q89. Which option best describes memory leaks in managed code in C#/.NET?

A. Unintended retention via static refs/events. B. Only via unmanaged code. C. Always impossible in managed code. D. Only with finalizers.

Select an answer to check.

Answer: Unintended retention via static refs/events.

For this question, Unintended retention via static refs/events. is correct. GC can't collect referenced objects. That is exactly the concept behind which option best describes memory leaks in managed in this context. The remaining choices fail because they don’t satisfy the full definition.

Q90. What is the primary purpose of memory leaks in managed code?

A. Always impossible in managed code. B. Unintended retention via static refs/events. C. Only via unmanaged code. D. Only with finalizers.

Select an answer to check.

Answer: Unintended retention via static refs/events.

Unintended retention via static refs/events. is the correct answer here. GC can't collect referenced objects. That is exactly the concept behind what is the primary purpose of memory leaks in this context. The remaining choices fail because they don’t satisfy the full definition.

Q91. Which statement about memory leaks in managed code is most accurate?

A. Always impossible in managed code. B. Only via unmanaged code. C. Unintended retention via static refs/events. D. Only with finalizers.

Select an answer to check.

Answer: Unintended retention via static refs/events.

Here, Unintended retention via static refs/events. is the right choice. GC can't collect referenced objects. It fits the requirement in the prompt about which statement about memory leaks in managed code. The remaining choices fail because they don’t satisfy the full definition.

Q92. How is memory leaks in managed code best characterized?

A. Only with finalizers. B. Only via unmanaged code. C. Always impossible in managed code. D. Unintended retention via static refs/events.

Select an answer to check.

Answer: Unintended retention via static refs/events.

In this case, Unintended retention via static refs/events. is correct. GC can't collect referenced objects. It fits the requirement in the prompt about how is memory leaks in managed code best. The remaining choices fail because they don’t satisfy the full definition.

Q93. Which option best describes PinnedObjectHeap (.NET 5+) in C#/.NET?

A. A pure pool. B. Heap region for pinned objects. C. A native heap only. D. A stack region.

Select an answer to check.

Answer: Heap region for pinned objects.

The best option here is Heap region for pinned objects.. Improves interop performance. It fits the requirement in the prompt about which option best describes pinnedobjectheap (.net 5+) in. The remaining choices fail because they don’t satisfy the full definition.

Q94. What is the primary purpose of PinnedObjectHeap (.NET 5+)?

A. Heap region for pinned objects. B. A native heap only. C. A pure pool. D. A stack region.

Select an answer to check.

Answer: Heap region for pinned objects.

For this question, Heap region for pinned objects. is correct. Improves interop performance. It fits the requirement in the prompt about what is the primary purpose of pinnedobjectheap (.net. The remaining choices fail because they don’t satisfy the full definition.

Q95. Which statement about PinnedObjectHeap (.NET 5+) is most accurate?

A. Heap region for pinned objects. B. A stack region. C. A native heap only. D. A pure pool.

Select an answer to check.

Answer: Heap region for pinned objects.

Heap region for pinned objects. is the correct answer here. Improves interop performance. It fits the requirement in the prompt about which statement about pinnedobjectheap (.net 5+) is most. The remaining choices fail because they don’t satisfy the full definition.

Q96. How is PinnedObjectHeap (.NET 5+) best characterized?

A. A pure pool. B. A native heap only. C. Heap region for pinned objects. D. A stack region.

Select an answer to check.

Answer: Heap region for pinned objects.

Here, Heap region for pinned objects. is the right choice. Improves interop performance. This is the most accurate statement for how is pinnedobjectheap (.net 5+) best characterized. The remaining choices fail because they don’t satisfy the full definition.

Q97. Which option best describes memory profiling in C#/.NET?

A. Tools to find allocations and retention. B. Network profiler only. C. Disk profiler only. D. Pure CPU profiler only.

Select an answer to check.

Answer: Tools to find allocations and retention.

In this case, Tools to find allocations and retention. is correct. DotMemory, PerfView, dotnet-counters. This is the most accurate statement for which option best describes memory profiling in c#/.net. The remaining choices fail because they don’t satisfy the full definition.

Q98. What is the primary purpose of memory profiling?

A. Tools to find allocations and retention. B. Network profiler only. C. Disk profiler only. D. Pure CPU profiler only.

Select an answer to check.

Answer: Tools to find allocations and retention.

The best option here is Tools to find allocations and retention.. DotMemory, PerfView, dotnet-counters. This is the most accurate statement for what is the primary purpose of memory profiling. The remaining choices fail because they don’t satisfy the full definition.

Q99. Which statement about memory profiling is most accurate?

A. Pure CPU profiler only. B. Tools to find allocations and retention. C. Disk profiler only. D. Network profiler only.

Select an answer to check.

Answer: Tools to find allocations and retention.

For this question, Tools to find allocations and retention. is correct. DotMemory, PerfView, dotnet-counters. This is the most accurate statement for which statement about memory profiling is most accurate. The remaining choices fail because they don’t satisfy the full definition.

Q100. How is memory profiling best characterized?

A. Network profiler only. B. Pure CPU profiler only. C. Tools to find allocations and retention. D. Disk profiler only.

Select an answer to check.

Answer: Tools to find allocations and retention.

Tools to find allocations and retention. is the correct answer here. DotMemory, PerfView, dotnet-counters. This is the most accurate statement for how is memory profiling best characterized. The remaining choices fail because they don’t satisfy the full definition.