Computer Applications Official Board 2024-2025 (English Medium) ICSE Class 10 Question Paper Solution

Character class methods are found in the package called ______.

java.util

java.lang

java.awt

java.io

System.out.println(‘Z’+32); will display ______.

z

Z

122

154

double x [ ]={2.5,4.5,5.5,6.4}; occupies ______ bytes.

16

4

8

32

The output of 42/6%2 is ______.

1

10

2

0

Consider the Two dimensional array P[2][3], of peripherals (input/output devices) given above, state the index of the device Barcode Scanner.

P[1][1]

P[0][1]

P[1][2]

P[0][0]

Which of the following is user defined data type?

only 1

1 and 3

only 2

only 4

Select the infinite loop:

for(int i=1;i<=10;i++)

for(int i=2; i!=0 ;i-=3)

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

for(int i =1;i>=1; i - -)

The output of Math.max(−7, Math.min(−5,−4)) is ______.

−5

−4

−7

error

Which of the following is true for the given object creation statement? Game cricket = new Game( );

Game is an object of cricket class

New keyword creates object Game

Game is a class and cricket is an object

Game and cricket are objects

Post office is an example for ______ access specifier.

public

local

protected

private

Assertion (A): In switch case break statement avoids fall through.

Reason (R): break statement helps to execute only one case at a time.

Both (A) and (R) are true and (R) is a correct explanation of (A).

Both (A) and (R) are true and (R) is not a correct explanation of (A).

(A) is true and (R) is false.

(A) is false and (R) is true.

A physical education teacher asks the students to do the side stretch as shown below, 10 times. Which programming construct the teacher uses?

if

switch

for

if else if

The index (subscript) of the last element of an array ar[ ] is ______.

ar.length( )

ar[ ].length

ar.length()-1

ar.length-1

Assertion (A): A clock is a real-life example of nested loops.

Reason (R): The hour hand moves through 12 positions, while the minute hand moves through 60 positions within each hour.

Both (A) and (R) are true and (R) is a correct explanation of (A).

Both (A) and (R) are true and (R) is not a correct explanation of (A).

(A) is true and (R) is false.

(A) is false and (R) is true.

Which of the following pairs of methods will cause a compile-time error due to incorrect method overloading?

void test(int a, int b) and void test(double a, double b)

void test(int a, double b) and void test(double a, int b)

void test(int a, double b) and void test(int a)

void test(int a) and int test(int a)

Consider the program segment:

int p=0;
for(p=4 ; p>0 ; p- =2);
System.out.print(p);
System.out.println(p);

The above statements will display:

42

4200

0
0

00

System.out.println("I said,\“It\'s wise to obey elders.\””);

The output of the above statement is:

I said,‘It is wise to obey elders.’

I said, “It’s wise to obey elders.”

I said,It’s wise to elders.

“'It's wise to obey elders.'”

What is the output of the statement given below?

“ANGER”.compareTo(“ANGEL”)

3

−6

6

0

Consider the following program segment in which the statements are jumbled. Choose the correct order of statements to calculate and return the factorial of 4.

for (k=1; k<=4; k++) →1
return fa;           →2
long fa = 1, k;      →3
fa*=k;               →4

1, 2, 3, 4

3, 1, 4, 2

3, 1, 2, 4

1, 3, 2, 4

Write the java expression to find the product of square root of P and the square root of Q using the methods of Math class.

Write the output of the following String method:

String x= “ talent” ; String y=”matrix” ;
System.out.print(x.substring(3).concat(y.substring(3)));

Write the Java statement for creating an object named ‘sifra’ of the class ‘Robot’, which takes three double parameters.

Convert the given loop into exit controlled loop.

int a,b;
for ( a=10,b=1; a>=1 ;a-=2)
{
b+=a;
b++;
}
System.out.print(b);

Consider and give the output of the following program:

class report
{ int a,b;
 report()
 { a=10;
 b=15;
 }
 report(int x, int y)
 { a=x;
 b=y;
 }
 void print()
 { System.out.println(a*b);
 }
 static void main()
 { report r = new report();
 r.print();
 report p = new report(4, 5);
 p.print();
 }
}

Name one String method which results in positive integer only.

Name one String method which results in a character.

John was asked to write a Java code to calculate the surface area of a cone, the following code was written by him:

Surface area of cone is A = πrl        `l = sqrt(r^2 + h^2)`

class area
{ double area (double r, double h)
 { double l, a;
 a=22.0/7*r*l;
 l=Math.sqrt(r*r+h*h);
 return a;
 }
}

Specify the type of the error in the above program, correct and write the program to be error free.

Consider the following array and answer the questions given below:

int a[ ] = {12,10,8,4,6,2,3,5,7}

What is the output of System.out.print(a[0]+a[5]);?

Consider the following array and answer the question given below:

int a[ ] = {12,10,8,4,6,2,3,5,7}

What is the index (subscript) of the largest element of the array a[ ]?

Write the Java statement to initialise the first 6 odd numbers in a 3 × 2 array. What is the result of x[0][1] + x[2][1] of the above array?

Give the output of the following program segment and specify how many times the loop is executed.

String s = “JAVA”;
for(i=0;i<s.length();i+=2)
System.out.println(s.substring(i));

Define a class named CloudStorage with the following specifications:

Member Variables:

• int acno – stores the user's account number.
• int space – stores the amount of storage space in GB purchased by the user.
• double bill – stores the total price to be paid by the user.

Member Methods:

• void accept() – prompts the user to input their account number and storage space using Scanner class methods only.
• void calculate() – calculates the bill total price based on the storage space purchased using the pricing table provided:
  

  Storage range	Price per GB (Rs)
  First 15 GB	15
  Next 15 GB	13
  Above 30 GB	11

• void display() − displays the account number, storage space and bill to be paid.

Write a main method to create an object of the class and invoke the methods of the class with respect to the object.

Define a class to accept values into a 4 x 4 integer array. Calculate and print the NORM of the array. 

NORM is the square root of sum of squares of all elements.

Sum of squares of elements = 1+4+1+9+25+4+1+36+9+36+1+4+9+16+36+9 = 201

NORM = Squareroot of 201 = 14.177446878757825

Define a class to accept a String and Print if it is a Super string or not. A String is Super if the number of uppercase letters are equal to the number of lower case letters.

[Use Character & String methods only]
Example: “COmmITmeNt”
Number of Uppercase letters – 5
Number of Lowercase letters – 5
String is a Super String

Define a class to initialise the following data in an array.

Search for a given character input by the user, using the Binary Search technique.

Print “Search Successful” if the character is found otherwise print “Search is not Successful”.

‘A’, ‘H’, ‘N’, ‘P’, ‘S’, ’U’, ‘W’, ‘Y’, ‘Z’, ‘b’, ‘d’

Define a class to overload the method print() as follows:

void print ( ) – To print the given format using nested loops.

@#@#@

@#@#@

@#@#@

@#@#@

double print(double a, double b) – To display the sum of numbers between a and b with difference of 0.5.

e.g. if a = 1.0, b = 4.0

output is: 1.0 + 1.5 + 2.0 + 2.5 + ……………. + 4.0

int print(char ch1, char ch2) – compare the two characters and return the ASCII code of the largest character.

Define a class to accept a number. Check if the sum of the largest digit and the smallest digit is an even number or an odd number. Print appropriate messages.