EmSAT Computer Science C++ Mock Test 2024 Questions Answers

EmSAT Computer Science C++ Mock Test 2024 Questions Answers: Our free EmSAT Programming and Problem-Solving (C++) mock test is a practice test designed for students who are preparing to take the official EmSAT exam in the UAE. This mock test is specifically focused on testing the student’s knowledge and skills in programming and problem-solving using C++ language.

The EmSAT Computer Science C++ Mock Test is typically structured in a similar way to the official EmSAT exam, and consists of a set of multiple-choice questions that cover various topics such as variables, control structures, data structures, functions, debugging, and problem-solving. Additionally, check EmSAT Computer Science Achieve Mock Tests.

The purpose of this mock test is to help students identify their strengths and weaknesses in the subject matter and to provide them with an opportunity to practice their test-taking skills. It also helps students to become familiar with the format and structure of the official EmSAT Computer Science exam.

EmSAT Computer Science C++ Mock Test

Mock Tests

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EmSAT Computer Science Mock Test
Section 4: Programming and Problem Solving (C++)
Total Questions: 56
Time Limit: 60 Minutes

1 / 56

What is the output of the following code?

#include 
using namespace std;

void myFunction(int x) {
for (int i = 1; i <= x; i++) {
cout << i << " ";
}
}

int main() {
myFunction(5);
return 0;
}

A) 1 2 3 4 5

B) 5 4 3 2 1

C) 5

D) 1

2 / 56

2) What is the output of the following code?

#include 
using namespace std;

int myFunction(int x) {
return x * 2;
}

int main() {
int y = myFunction(3);
cout << y;
return 0;
}

A) 3

B) 6

C) 9

D) 12

3 / 56

What is the output of the following user-defined function in C++?

void printMsg(string msg) {
cout << "The message is: " << msg << endl;
}

int main() {
string message = "Hello, world!";
printMsg(message);
return 0;
}

A) The message is: Hello, world!

B) The message is:

C) Hello, world!

D) Hello,

4 / 56

4) What is the output of the following user-defined function in C++?

int add(int x, int y) {
return x + y;
}

int main() {
int a = 5, b = 3;
int sum = add(a, b);
cout << sum;
return 0;
}

A) 2

B) 3

C) 4

D) 8

5 / 56

5) Which built-in function can be used to generate a random number in a specific range?

A) rand()

B) random()

C) generate()

D) range()

6 / 56

6) Which built-in function can be used to convert a string to an integer?

A) atoi()

B) strToInt()

C) toInt()

D) intConv()

7 / 56

7) Which of the following is an example of a two-dimensional array in C++?

A) int array[] = {1, 2, 3, 4};

B) int array[3] = {1, 2, 3};

C) int array[2][3] = {{1, 2, 3}, {4, 5, 6}};

D) int array[2] = {1, 2};

8 / 56

8) How do you initialize all elements of an array to the same value in C++?

A) Using a for loop

B) Using the fill() function

C) Using the memset() function

D) Using the assign() function

9 / 56

9) Which of the following is the correct way to declare an array of strings in C++?

A) char array[] = {"string1", "string2", "string3"};

B) string array[] = {"string1", "string2", "string3"};

C) string[] array = {"string1", "string2", "string3"};

D) char* array = {"string1", "string2", "string3"};

10 / 56

10) Which of the following correctly declares an array of integers in C++?

A) int array[] = {1, 2, 3, 4};

B) array = {1, 2, 3, 4};

C) int[] array = {1, 2, 3, 4};

D) int array[4] = {1, 2, 3, 4};

11 / 56

11) Which of the following is the correct syntax for declaring a variable in C++?

A) varName data_type = value;

B) data_type varName = value;

C) data_type value varName;

D) value data_type varName;

12 / 56

12) What is the difference between declaring a variable and initializing a variable in C++?

A) Declaring a variable means allocating memory for it, while initializing a variable means assigning a value to it

B) Initializing a variable means allocating memory for it, while declaring a variable means assigning a value to it

C) Declaring a variable means defining its data type, while initializing a variable means defining its scope

D) None of the above

13 / 56

13) Which of the following data structures allows you to store multiple values of the same data type in a single variable?

A) struct

B) array

C) float

D) char

14 / 56

14) Which keyword is used to declare a variable in C++?

A) var

B) const

C) let

D) int

15 / 56

15) Which of the following is not a built-in data type in C++?

A) int

B) float

C) array

D) string

16 / 56

16) When should you use a user-defined function in C++ instead of a built-in function?

A) When you need to manipulate data structures

B) When you need to format input data

C) When you need to format output data

D) When the built-in function does not exist or cannot be used in the desired way

17 / 56

17) Which of the following is an example of a built-in function in C++?

A) calculateAverage()

B) input()

C) print()

D) sqrt()

18 / 56

18) How do functions interact with each other in a program?

A) They can only be executed one after another

B) They can only be executed at the same time

C) They can call each other and pass data between them

D) They cannot interact with each other

19 / 56

19) Which of the following is an example of a well-defined task that could be turned into a function?

A) Adding two random numbers

B) Printing the current date and time

C) Checking if a number is prime

D) Creating a new folder on the desktop

20 / 56

20) What is a function in programming?

A) A group of variables

B) A set of commands that can be executed

C) A way to display output to the screen

D) A way to store data in the program

21 / 56

21) What is the purpose of decomposing a complex program into functions?

A) To make the code more difficult to read

B) To make the program slower

C) To make the code more modular and easier to manage

D) To add unnecessary complexity to the program

22 / 56

22) How are problem-solving skills used in programming?

A) To create complex data structures

B) To enhance program speed

C) To solve simple or complex life problems

D) To create a user interface

23 / 56

23) What is the purpose of testing and debugging in C++ programming?

A) To create complex data structures

B) To remove errors in the code

C) To enhance program speed

D) To create a user interface

24 / 56

24) When selecting data structures in C++ programming, what is the primary consideration?

A) The complexity of the data

B) The size of the data

C) The type of the data

D) The color of the data

25 / 56

25) What is the purpose of a module in C++ programming?

A) To declare variables

B) To execute a function

C) To store data

D) To create a user interface

26 / 56

26) Which of the following is an example of a built-in function in C++ programming?

A) cout

B) while loop

C) if statement

D) switch statement

27 / 56

27) Which of the following is not a type of control structure statement in C++ programming?

A) if-else statement

B) switch statement

C) for loop statement

D) array statement

28 / 56

28) What is the output of the following C++ code?

#include 
using namespace std;
void recursive(int n)
{
if(n>0)
{
cout << n << " ";
recursive(n-2);
recursive(n-1);
}
}
int main()
{
recursive(5);
return 0;
}

A) 5 3 1 2 4

B) 5 3 1 4 2

C) 5 3 2 1 4

D) 5 3 2 4 1

29 / 56

29) What is the output of the following C++ code?

#include 
using namespace std;
void recursive(int n)
{
if(n>0)
{
recursive(n-1);
cout << n << " ";
recursive(n-2);
}
}
int main()
{
recursive(4);
return 0;
}

A) 4 3 2 1 0 1

B) 1 2 3 4

C) 1 3 2 4

D) 4 3 1 2

30 / 56

30) What is the output of the following C++ code?

#include 
using namespace std;
int recursive(int n)
{
if(n==0)
return 0;
else
return (n + recursive(n-1));
}
int main()
{
cout << recursive(5);
return 0;
}

A) 0

B) 5

C) 15

D) 25

31 / 56

31) What will be the output of the following C++ code?

for(int i=0; i<3; i++) {
for(int j=0; j<3; j++) {
if(i == j) {
continue;
}
cout << i * j << " ";
}
}

A) 0 1 2 3 4 6

B) 0 1 2 4 6 8

C) 0 1 3 4 6 7

D) None of the above

32 / 56

32) What will be the output of the following C++ code?

for(int i=1, j=5; i<=5; i++, j--) {
cout << i * j << " ";
}

A) 5 8 9 8 5

B) 5 4 9 8 5

C) 5 6 9 8 5

D) None of the above

33 / 56

33) What will be the output of the following C++ code?

int sum = 0;
for(int i=1; i<=10; i++) {
if(i%2 == 0) {
continue;
}
sum += i;
}
cout << sum;

A) 25

B) 20

C) 30

D) 15

34 / 56

34) What will be the output of the following C++ code snippet?

int num = 8;
switch(num%3) {
case 0:
cout << "Zero ";
case 1:
cout << "One ";
default:
cout << "Default ";
}

A) Four Five Six

B) Four Five Six Seven

C) Five Six

D) Six Seven

35 / 56

35) What is the output of the following code?

int x = 10, y = 5;
if(x > y)
if(y > 2)
cout << "x is greater than y and y is greater than 2";
else
cout << "x is greater than y and y is less than or equal to 2";
else
cout << "x is less than or equal to y";

A) x is greater than y and y is greater than 2

B) x is greater than y and y is less than or equal to 2

C) x is less than or equal to y

D) Compile-time error

36 / 56

36) What is the output of the following code?

int x = 5;
if(x > 10)
{
cout << "x is greater than 10";
}
else if(x > 5)
{
cout << "x is greater than 5";
}
else
{
cout << "x is less than or equal to 5";
}

A) x is greater than 10

B) x is greater than 5

C) x is less than or equal to 5

D) Compile-time error

37 / 56

37) What will be the output of the following code?

int x = 10;
if(x > 5)
{
cout << "x is greater than 5";
}
else
{
cout << "x is less than or equal to 5";
}

A) x is greater than 5

B) x is less than or equal to 5

C) Compile-time error

D) Runtime error

38 / 56

38) What is the output of the following code?

int i = 1;
while (i <= 10) {
if (i % 2 == 0) {
cout << i << endl;
}
i++;
}

A) 1 3 5 7 9

B) 2 4 6 8 10

C) 1 2 3 4 5 6 7 8 9 10

D) None of the above

39 / 56

39) Which of the following is not a control structure in C++?

A) if-else statement

B) while loop

C) for loop

D) do-while loop

40 / 56

40) When is it appropriate to use external data structures in C++?

A) When the data needs to be manipulated frequently within the program.

B) When the data needs to be stored for future use.

C) When the data is too large to be stored in the program's memory.

D) When the data is simple and does not require storage in an external file.

41 / 56

41) Which of the following functions is used to write data to a file in C++?

A) write()

B) get()

C) read()

D) put()

42 / 56

42) Which function is used to read data from a file in C++?

A) put()

B) get()

C) write()

D) read()

43 / 56

43) What is the purpose of the fstream class in C++?

A) To handle file input/output operations.

B) To handle string input/output operations.

C) To handle mathematical operations.

D) To handle conditional statements.

44 / 56

44) Which of the following is not a valid mode for opening a file in C++?

A) "r"

B) "w"

C) "x"

D) "a"

45 / 56

int num = 100;
while (num > 0) {
if (num % 7 == 0 && num % 3 == 0) {
cout << num << " is divisible by both 7 and 3." << endl;
}
num--;
}

45) How many times will the "if" statement in the above code be executed?

A) 33

B) 14

C) 32

D) 15

46 / 56

int num = 100;
while (num > 0) {
if (num % 7 == 0 && num % 3 == 0) {
cout << num << " is divisible by both 7 and 3." << endl;
}
num--;
}

46) What is the purpose of the if statement in the above code?

A) To check if the value of num is odd

B) To check if the value of num is even

C) To check if the value of num is divisible by both 7 and 3

D) To check if the value of num is a prime number

47 / 56

int num = 100;
while (num > 0) {
if (num % 7 == 0 && num % 3 == 0) {
cout << num << " is divisible by both 7 and 3." << endl;
}
num--;
}

47) What is the initial value of the variable num in the above code?

A) 0

B) 100

C) 7

D) 3

48 / 56

48) Which of the following data structures is designed to store elements in a specific order, and allows fast access to elements at the front and back of the structure?

A) Stack

B) Queue

C) Linked list

D) Array

49 / 56

49) Which of the following is a built-in C++ function that can be used to sort elements in an array or vector?

A) sort()

B) reverse()

C) max()

D) min()

50 / 56

50) Which of the following statements is true about the use of data structures in programming?

A) Data structures should always be used to solve programming problems, regardless of the problem's complexity.

B) The use of data structures can make it easier to hide the complexity of a problem and simplify the program code.

C) Data structures should only be used for problems that involve large amounts of data.

D) Data structures are not necessary for solving simple programming problems.

51 / 56

51) What is the output of the following code snippet?


int i = 0;
while (i < 10) {
if (i % 2 == 0) {
i++;
continue;
}
cout << i << " ";
i++;
}

A) 1 3 5 7 9

B) 0 2 4 6 8

C) 1 2 3 4 5

D) 0 1 2 3 4

52 / 56

52) What is the output of the following code?

#include 
using namespace std;

int main() {
int num = 10;

if (num % 2 == 0) {
cout << "Num is even" << endl;
} else {
cout << "Num is odd" << endl;
}

return 0;
}

A) Num is even

B) Num is odd

C) Num is prime

D) Num is non=prime

53 / 56

53) What will be the output of the following code?

int i = 10, j = 1;
do {
cout << i * j << " ";
j++;
} while (j <= 10);

A) 1 2 3 4 5 6 7 8 9 10

B) 10 20 30 40 50 60 70 80 90 100

C) 10 11 12 13 14 15 16 17 18 19

D) 10

54 / 56

54) What is the value of "x" after executing the following code?

double x = pow(2, 3) * sqrt(25) - ceil(4.6);

A) 17.0

B) 13.0

C) 16.0

D) 12.0

55 / 56

55) Which type of error occurs during program execution and can cause the program to crash or terminate unexpectedly?

A) Logic error

B) Runtime error

C) Syntax error

D) Semantic error

56 / 56

56) Which type of error is caused by incorrect syntax in the code?

A) Logic error

B) Runtime error

C) Syntax error

D) Semantic error

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