Đề thi trắc nghiệm môn C sharp (4)

Which of the following statements is correct about the C#.NET code snippet given below?. Which of the following is the correct way to implement the interface given below?. Which of the

A 1, 3

B 2, 4

C 3, 5

D 4 only

13 Which of the following statements is correct about the C#.NET code snippet given

below?

interface IMyInterface

{

void fun1();

void fun2();

}

class MyClass: IMyInterface

{

private int i;

void IMyInterface.fun1()

{

// Some code

}

}

A Class MyClass is an abstract class

B Class MyClass cannot contain instance data

C Class MyClass fully implements the interface IMyInterface

D Interface IMyInterface should be inherited from the Object class

E The compiler will report an error since the interface IMyInterface is only partially implemented

14 Which of the following statements is correct about the C#.NET code snippet given

below?

interface IPerson

{

String FirstName

{

set;

}

String LastName

{

get;

set;

}

void Print();

void Stock();

int Fun();

}

A Properties cannot be declared inside an interface

B This is a perfectly workable interface

C The properties in the interface must have a body

D Subroutine in the interface must have a body

E Functions cannot be declared inside an interface

15 Which of the following is the correct way to implement the interface given below?

interface IPerson

{

String FirstName

{

get;

set;

}

}

A.

{

{

get

{

return str;

}

set

{

str = value;

}

}

}

B

{

{

get

{

return str;

}

set

{

str = value;

}

}

}

C

{

{

get

{

return str;

}

set

{

str = value;

}

}

}

D None of the above

Câu hỏi Operators

1 Which of the following are the correct ways to increment the value of variable a by 1 ?

5 a = +1;

A 1, 3

B 2, 4

C 3, 5

D 4, 5

E None of these

2 What will be the output of the C#.NET code snippet given below?

byte b1 = 0xF7;

byte b2 = 0xAB;

byte temp;

temp = (byte)(b1 & b2);

Console.Write (temp + " ");

temp = (byte)(b1^b2);

Console.WriteLine(temp);

A 163 92

B 92 163

C 192 63

D 0 1

3 Which of the following is NOT an Arithmetic operator in C#.NET?

E *

4, Which of the following are NOT Relational operators in C#.NET?

1 >=

2 !=

3 Not

4 <=

5 <>=

A 1, 3

B 2, 4

C 3, 5

D 4, 5

E None of these

5 Which of the following is NOT a Bitwise operator in C#.NET?

E ~

6 Which of the following statements is correct about the C#.NET code snippet given

below?

int d;

d = Convert.ToInt32( !(30 < 20) );

A A value 0 will be assigned to d

B A value 1 will be assigned to d

C A value -1 will be assigned to d

D The code reports an error

E The code snippet will work correctly if ! is replaced by Not

7 Which of the following is the correct output for the C#.NET code snippet given below?

Console.WriteLine(13 / 2 + " " + 13 % 2);

A 6.5 1

B 6.5 0

C 6 0

D 6 1

E 6.5 6.5

8 Which of the following statements are correct about the Bitwise & operator used in C#.NET?

1 The & operator can be used to Invert a bit

2 The & operator can be used to put ON a bit

3 The & operator can be used to put OFF a bit

4 The & operator can be used to check whether a bit is ON

5 The & operator can be used to check whether a bit is OFF

A 1, 2, 4

B 2, 3, 5

C 3, 4

D 3, 4, 5

E None of these

9 Which of the following are Logical operators in C#.NET?

1 &&

2 ||

3 !

4 Xor

5 %

A 1, 2, 3

B 1, 3, 4

C 2, 4, 5

D 3, 4, 5

E None of these

10 Suppose n is a variable of the type Byte and we wish, to check whether its fourth bit (from right) is ON or OFF Which of the following statements will do this correctly?

A ifConsole.WriteLine( ((n&16) == 16) "Fourth bit is ON");

B. ifConsole.WriteLine( ((n&8) == 8) "Fourth bit is ON");

C if ((n ! 8) == 8)

Console.WriteLine("Fourth bit is ON");

D ifConsole.WriteLine( ((n ^ 8) == 8) "Fourth bit is ON");

E if ((n ~ 8) == 8)

Console WriteLine("Fourth bit is ON");

Mô tả đáp án:

byte myByte = 153; // In Binary = 10011001

byte n = 8; // In Binary = 00001000

(Here 1 is the 4th bit from right)

Now perform logical AND operation (n & myByte)

10011001

00001000

-

00001000 Here result is other than 0, so evaluated to True

-

If the result is true, then we can understand that 4th bit is ON of the given datamyByte

11 What will be the output of the C#.NET code snippet given below?

int num = 1, z = 5;

if (!(num <= 0))

Console.WriteLine( ++num + z++ + " " + ++z );

else

Console.WriteLine( num + z + " " + z );

A 5 6

B 6 5

C 6 6

D 7 7

12 Suppose n is a variable of the type Byte and we wish to put OFF its fourth bit (from right) without disturbing any other bits Which of the following statements will do this correctly?

A n = n && HF7

B n = n & 16

C n = n & 0xF7

D n = n & HexF7

E n = n & 8

13 What will be the output of the C#.NET code snippet given below?

byte b1 = 0xAB;

byte temp;

temp = (byte)~b2;

Console.Write(temp + " ");

temp = (byte)(b1 << b2);

Console.Write (temp + " ");

temp = (byte) (b2 >> 2);

Console.WriteLine(temp);

A 102 1 38

B 108 0 32

C 102 0 38 D 1 0 1

14 Which of the following statements is correct about Bitwise | operator used in

C#.NET?

A The | operator can be used to put OFF a bit

B The | operator can be used to Invert a bit

C The | operator can be used to check whether a bit is ON

D The | operator can be used to check whether a bit is OFF

E The | operator can be used to put ON a bit

15 Which of the following is NOT an Assignment operator in C#.NET?

E %=

16 What will be the output of the C#.NET code snippet given below?

int i, j = 1, k;

for (i = 0; i < 5; i++)

{

k = j++ + ++j;

Console.Write(k + " ");

}

A 8 4 16 12 20

B 4 8 12 16 20

C 4 8 16 32 64

D 2 4 6 8 10

17 What will be the output of the C#.NET code snippet given below?

int a = 10, b = 20, c = 30;

int res = a < b ? a < c ? c : a : b;

Console.WriteLine(res);

A 10

B 20

C 30 D Compile Error / Syntax Error

18 Which of the following statements are correct about the following code snippet?

int a = 10;

int b = 20;

bool c;

c = !(a > b);

1 There is no error in the code snippet

2 An error will be reported since ! can work only with an int

3 A value 1 will be assigned to c

4 A value True will be assigned to c

5 A value False will be assigned to c

A 1, 3

B 2, 4

C 4, 5

D 1, 4

E None of these

19 Which of the following statements is correct about Bitwise ^ operator used in C#.NET?

A The ^ operator can be used to put ON a bit

B The ^ operator can be used to put OFF a bit

C The ^ operator can be used to Invert 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

20 Which of the following statements are correct?

1 The conditional operator (?:) returns one of two values depending on the value of a Boolean expression

2 The as operator in C#.NET is used to perform conversions between compatible reference

types

3 The &* operator is also used to declare pointer types and to dereference pointers

4 The -> operator combines pointer dereferencing and member access

5 In addition to being used to specify the order of operations in an expression, brackets [ ] are used to specify casts or type conversions

A 1, 2, 4

B 2, 3, 5

C 3, 4, 5

D 1, 3, 5

E None of these

Câu hỏi Attributes

1 The [Serializable()] attribute gets inspected at

A Compile-time

B Run-time

C Design-time

D Linking-time

E None of the above

2 Which of the following are correct ways to specify the targets for a custom

attribute?

A By applying AttributeUsage to the custom attribute's class definition

B By applying UsageAttribute to the custom attribute's class definition

C Once an attribute is declared it applies to all the targets

D By applying AttributeUsageAttribute to the custom attribute's class definition

E None of the above

3 Which of the following are correct ways to pass a parameter to an attribute?