C# MCQ – Multiple Choice Questions and Answers – Part 1
Multiple choice questions and answers (MCQs) on C# to prepare for exams, tests, and certifications. These questions are taken from a real written exam and some parts are taken from an interview. So you will find questions on basic techniques such as Variables, Operators, Conditional Statement, Functions, and more. This quiz will easily prepare anyone to pass their online test.
1. CLR means __________ ?
A Common Local Runtime
B Common Language Runtime
C Common Language Realtime
D Common Local Realtime
CLR transforms the source code into a form of secondary code called CIL (Common Intermediate Language). At runtime, CLR manages the execution of the CIL code.
2. CLR is responsible for __________ ?
A Garbage-collector
B Code access security
C Code verification
D All the answers are true
3. GAC means __________ ?
A Global Assembly Cache
B Global Assembly Store
C Garbage Assemble Cache
D Global Advanced Cache
The concept of GAC is the result of the .NET architecture which was designed to address the “DLL” problem that existed in COM (Component Object Model). Unlike COM, it is not necessary for the assembly in GAC to be registered before its use. The access to each “assembly” is global, without conflict, by identifying its name, its version, its architecture and its public key.
4. GAC __________ ?
A Stores .net assemblies shared between several applications.
B Stores global dll’s.
C Caching application data.
D None of the above
5. What are the types of JIT?
A Pre-JIT
B Econo-JT
C Normal-JIT
D All the answers are true
JIT compilation was born out of the need for a compiler to take on responsibilities in addition to converting to object code (machine instructions) from a high-level language. JIT compilers facilitate portability to multiple operating systems and hardware platforms. Languages such as Java and C# support JIT compilation.
There are three types of JIT compilers:
- Pre-JIT: Compiles the entire source code at compile time and is used at deployment time.
- Econo-JIT: Compiles the methods called at runtime.
- Normal-JIT: Compiles only the methods called at runtime (at the time of their first call) and stores the compiled code in the cache for use in subsequent calls.
6. Garbage collector (GC) includes _______ generations.
A One
B Two
C Three
D Five
- The 0 generation identifies a newly created object that has never been marked for collection.
- The 1st generation identifies an object that survived a GC (marked for collection but not deleted because there was enough heap space)
- The 2nd generation identifies an object that has survived more than one GC scan.
7. How to force the garbage-collector to run?
A Using the method GC.Run()
B Using the method GC.Collect()
C Using the method GC.Collection()
D Using the method GC.Finalize()
System.GC.Collect() forces the execution of the garbage-collector.
8. IL in .Net means ________?
A Intermediate Language
B International Language
C Interoperate Language
D Intermediate Local
9. What tool is used to display the IL code?
A Util.exe
B IL.exe
C GACUtil.exe
D IDASM.EXE
To open the ILDASM:
1- Open the Visual Studio command prompt.
2- Run the ILDASM command.
10. What does the term “boxing” mean in .net?
A Convert value type to object
B Convert reference type to value type
C Convert the primitive type into a value type
D None of the above
Boxing
int n = 123; object obj = n;
Unboxing
obj = 123; i = (int)obj;
The following image shows the result of the previous statements.
