Computer Applications Official 2023-2024 (English Medium) ICSE Class 10 Question Paper Solution

Consider the above picture and choose the correct statement from the following:

Polygon is the object and the pictures are classes

Both polygon and the pictures are classes

Polygon is the class and the pictures are objects

Both polygon and the pictures are objects

int x = 98; char ch = (char)x; what is the value in ch?

b

A

B

97

The output of the statement "CONCENTRATION" indexOf('T') is ______.

9

7

6

(-1)

The access specifier that gives least accessibility is ______.

Package

Public

Protected

Private

The output of the statement "talent". compareTo("genius") is ______.

11

-11

0

13

Which of the following is an escape sequence character in Java?

/n

\t

/t

//n

If (a>b&&b>c) then largest number is ______.

b

c

a

Wrong expression

What is the output of Math.ceil(5.4) + Math.ceil(4.5)?

10.0

11.0

12.0

9.0

What is the method to check whether a character is a letter or digit?

isDigif(char)

isLetterOrDigit()

isLetterOrDigit(char)

isLETTERorDIGIT(char)

The extension of a Java source code file is ______.

exe

obj

jvm

java

The number of bytes occupied by a character array of four rows and three columns is ______.

12

24

96

48

Which of the following data type cannot be used with switch case construct?

int

char

String

Double

Which of the following are entry-controlled loops?

1. for
2. while
3. do..while
4. switch

Only 1

1 and 2

1 and 3

3 and 4

Method which reverses a given number is ______:

Impure method

Pure method

Constructor

Destructor

If the name of the class is "Yellow", what can be the possible name for its constructors?

yellow

YELLOW

Yell

Yellow

Invoking a method by passing the objects of a class is termed as ______.

Call by reference

Call by value

Call by method

Call by constructor

The correct statement to create an object named mango of class fruit:

Fruit Mango = new fruit();

fruit mango = new fruit();

Mango fruit = new Mango();

fruit mango = new  mango();

Assertion (A): Static method can access static and instance variables.

Reason (R): Static variables can be accessed only by static method.

Assertion and Reason both are correct.

Assertion is true and Reason is false.

Assertion is false and Reason is true.

Assertion and Reason both are false.

What is the output of the Java code given below?

String color [ J = {"Blue", "Red", "Violet"}; System.out.println(color[2].length();

6

5

3

2

Which of the following mathematical methods returns only an integer?

Math.ceil(n)

Math.sqrt(n)

Math.floor(n)

Math.round(n)

Write Java expression for:

`(|a + b|)/(sqrt(a^2 + b^2))`

Evaluate the expression when x is 4:

x + = x + + * + + x %2; 

Rewrite the following do while program segment using for:

x = 10; y = 20;
do
{
   x++;
   y++;
}while (x<=20);
System.out.println(x*y);

Give the output of the following program segment. How many times is the loop executed?

for(x=10;x>20;x++)
System.out.println(x);
System.out.println(x*2);

String sl= "45.50";String s2="54.50";
double d1=Double.parseDouble(s1);
double d2=Doub1e.parseDouble(s2);
int x=(int)(d1+d2)

What is value of x?

Consider the following two-dimensional array and answer the questions given below:

int x[ ][] = {{4,3,2}, {7,8,2}, {8,3,10}, {1,2,9}};

1. What is the order of the array?
2. What is the value of x [0] [0] + x [2] [2]?

Differentiate between boxing and unboxing.

The following code to compare two strings is compiled, the following syntax error was displayed - incompatible types - int cannot be converted to boolean.

Identify the statement which has the error and write the correct statement. Give the output of the program segment.

void calculate()
  {
  String a="KING",b="KINGDOM";
  boolean x=a.compareTo(b);
  system.out.println(x);
  }

Consider the given program and answer the questions given below:

class temp
      {
      int a;
      temp()
      {
      a=10
      }
      temp(int z)
      a=z;
      }
      void print()
      {
      System.out.println(a);
      }
      void main()
      {
      temp t = new temp();
      temp x = new temp(30);
      t.print();
      x.print();
      }
      }
  

1. What concept of OOPs is depicted in the above program with two constructors?
2. What is the output of the method main()?

Primitive data types are built in data types which are a part of the wrapper classes. These wrapper classes are encapsulated in the java.lang package. Non primitive datatypes like Scanner class are a part of the utility package for which an object needs to be created.

1. To which package the Character and Boolean classes belong?
2. Write the statement to access the Scanner class in the program.

DTDC, a courier company, charges for the courier based on the weight of the parcel. Define a class with the following specifications:

Define a class to overload the method perform as follows:

Define a class to accept a number from user and check if it is an EvenPal number or not. (The number is said to be EvenPal number when number is palindrome number (a number is palindrome if it is equal to its reverse) and sum of its digits is an even number.)

Example: 121 - is a palindrome number

Sum of the digits - 1 + 2 + 1 = 4 which is an even number

Define a class to accept values into an integer array of order 4 x 4 and check whether it is a DIAGONAL array or not An array is DIAGONAL if the sum of the left diagonal elements equals the sum of the right diagonal elements. Print the appropriate message.

Example:

3 4 2 5   Sum of the left diagonal elements =

2 5 2 3   3 + 5 + 2 + 1 = 11

5 3 2 7   Sum of the right diagonal elements =

1 3 7 1   5 + 2 + 3 + 1 = 11

Define a class pin code and store the given pin codes in a single-dimensional array. Sort these pin codes in ascending order using the Selection Sort technique only. Display the sorted array.

110061, 110001, 110029, 110023, 110055, 110006, 110019, 110033

Define a class to accept the gmail id and check for its validity.

A gmail id is valid only if it has:

→ @

→ . (dot)

→ gmail

→ com

Example: [email protected] is a valid gmail id.