C# Programming Language Practice Test
- 1.1. If “real” data type is used in Database, whats the equivalent datatype in C#-
- A.
Decimal
- B.
Single
- C.
Double
- D.
None
- 2.1. String a= “100”; int b = 10; ___________ What should be written to get the out put as 110?
- A.
A.Int c = a+b;
- B.
B.String c = a + b;
- C.
C.Int c = Convert.ToInt32(a) + b;
- D.
D.Int c = Convert.ToInt32(a+b);
- 3.1. Array is a abstract class. So It cannot have constructor---
- A.
A.True
- B.
B.False
- 4.1. Can an Interface be instantiated directly?
- A.
A.Yes
- B.
B.No
- C.
C.It can be instantiated with static constructor
- D.
D.None of these
- 5.1. What is the Difference between Convert.ToInt32 and Int.Parse?
- A.
A.Both are Same
- B.
B.Int.Parse Can't Handle Null values , It will throws ArgumentNull Exception Error.
- C.
C.Convert.ToInt32 Can't Handle Null Values ,it will throws ArgumentNullException error.
- D.
D.Both can Handle Null Values
- E.
E.Both can't Handle Null Values
- 6.1. What is the difference between Convert.ToString(str) and str.ToString() method?
- A.
A.Convert.ToString(str) function handles NULL while str.ToString() does not. It will throw a NULL reference exception.
- B.
B.str.ToString() function handles NULL while Convert.ToString(str) does not. It will throw a NULL reference exception.
- C.
C.Both can handle NULL
- D.
D.None can Handle NULL
- 7.1. Which of the following statements are correct about the Bitwise & operator used in C#.NET?
- A.
The & operator can be used to Invert a bit.
- B.
The & operator can be used to put ON a bit.
- C.
The & operator can be used to put OFF a bit.
- D.
The & operator can be used to check whether a bit is ON.
- E.
The & operator can be used to check whether a bit is OFF.
- 8.1. Which of the following statements are correct?
- A.
The conditional operator (?:) returns one of two values depending on the value of a Boolean expression.
- B.
The &* operator is also used to declare pointer types and to dereference pointers.
- C.
In addition to being used to specify the order of operations in an expression, brackets [ ] are used to specify casts or type conversions.
- 9.1. Which of the following is an 8-byte Integer?
- A.
Char
- B.
Long
- C.
Short
- D.
Byte
- E.
Integer
- 10.1. What is the size of a Decimal?
- A.
4 byte
- B.
8 byte
- C.
16 byte
- D.
32 byte
- 11.1. Which of the following statements are correct? (Choose 2)
- A.
We can assign values of any type to variables of type object.
- B.
When a variable of a value type is converted to object, it is said to be unboxed.
- C.
When a variable of type object is converted to a value type, it is said to be boxed.
- D.
Boolean variable cannot have a value of null.
- E.
When a value type is boxed, an entirely new object must be allocated and constructed.
- 12.1. Which of the following statements are correct about data types? (Choose 3)
- A.
Each value type has an implicit default constructor that initializes the default value of that type.
- B.
It is possible for a value type to contain the null value.
- C.
All value types are derived implicitly from System.ValueType class.
- D.
It is not essential that local variables in C# must be initialized before being used.
- E.
Variables of reference types referred to as objects and store references to the actual data.
- 13.1. Which of the following statements are TRUE about the .NET CLR? (Choose which ever is correct)
- A.
It provides a language-neutral development & execution environment.
- B.
It ensures that an application would not be able to access memory that it is not authorized to access.
- C.
It provides services to run "managed" applications
- D.
The resources are garbage collected.
- E.
It provides services to run "unmanaged" applications.
- 14.1. Which of the following components of the .NET framework provide an extensible set of classes that can be used by any .NET compliant programming language?
- A.
.NET class libraries
- B.
Common Language Runtime
- C.
Common Language Infrastructure
- D.
Component Object Model
- E.
Common Type System
- 15.1. Which of the following jobs are done by Common Language Runtime?
- A.
It provides core services such as memory management, thread management, and remoting.
- B.
It enforces strict type safety.
- C.
It provides Code Access Security
- D.
It provides Garbage Collection Services
- E.
All the above
- 16.1. Which of the following statements are correct about functions used in C#.NET? (Choose 3)
- A.
Function definitions cannot be nested.
- B.
Functions can be called recursively.
- C.
If we do not return a value from a function then a value -1 gets returned.
- D.
To return the control from middle of a function exit function should be used.
- E.
Function calls can be nested.
- 17.1. How many values is a function capable of returning?
- A.
1
- B.
0
- C.
Depends upon how many params arguments does it use.
- D.
Any number of values
- E.
Depends upon how many ref arguments does it use.
- 18.1. Which of the following statements are correct?
- A.
Instance members of a class can be accessed only through an object of that class.
- B.
A class can contain only instance data and instance member function.
- C.
All objects created from a class will occupy equal number of bytes in memory.
- D.
A class can contain Friend functions.
- E.
A class is a blueprint or a template according to which objects are created.
- 19.1. Which of the following is the incorrect form of Decision Control instruction?
- A.
If (Condition1) {// Some statement}
- B.
If (Condition1) {// Some statement} else {// Some statement}
- C.
If (Condition1) {// Some statement} else {// Some statement} else if ( Condition2){//Some statement}
- D.
If ( Condition1 ) {// Some statement} else if ( Condition2 ) {// Some statement} else {// Some statement}
- E.
If ( Condition1 ) {// Some statement} else if ( Condition2 ) {// Some statement} else if ( Condition3 ) {// Some statement} else {// Some statement}
- 20.1. Which of the following statements are correct about the C#.NET code snippet given below? (Choose 3) if (age > 18 && no < 11) a = 25;
- A.
The condition no < 11 will be evaluated only if age > 18 evaluates to True.
- B.
The statement a = 25 will get executed if any one condition is True
- C.
The condition no < 11 will be evaluated only if age > 18 evaluates to False
- D.
The statement a = 25 will get executed if both the conditions are True.
- E.
&& is known as a short circuiting logical operator.
- 21.1. Which of the following can be facilitated by the Inheritance mechanism? (Choose 3)
- A.
Use the existing functionality of base class.
- B.
Overrride the existing functionality of base class.
- C.
Implement new functionality in the derived class.
- D.
Implement polymorphic behaviour.
- E.
Implement containership.
- 22.1. In an inheritance chain which of the following members of base class are accessible to the derived class members? (Chhose 2)
- A.
Static
- B.
Protected
- C.
Private
- D.
Shared
- E.
Public
- 23.1. Which of the following will be the correct output for the C#.NET code snippet given below? String s1 = "ALL MEN ARE CREATED EQUAL"; String s2; s2 = s1.Substring(12, 3); Console.WriteLine(s2);
- A.
ARE
- B.
CRE
- C.
CR
- D.
REA
- E.
CREATED
- 24.1. Which of the following statements will correctly copy the contents of one string into another ?
- A.
String s1 = "String"; String s2; s2 = s1;
- B.
String s1 = "String" ; String s2; s2 = String.Concat(s1, s2);
- C.
String s1 = "String"; String s2; s2 = String.Copy(s1);
- D.
String s1 = "String"; String s2; s2 = s1.Replace();
- E.
String s1 = "String"; String s2; s2 = s2.StringCopy(s1);
- 25.1. which of the following statements are true about finally block? (Choose 3)
- A.
Finally block is executed even if an error occurs
- B.
Finally block is definitely executed when leaving a try block.
- C.
Finally block is used to perform any necessary clean-up jobs.
- D.
Finally block is not executed if an error occurs
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