Computer Applications Set 1 2018-2019 (English Medium) ICSE Class 10 Question Paper Solution

Name any two basic principles of Object-oriented Programming.

Write a difference between unary and binary operator.

Name the keyword which: indicates that a method has no return type.

Name the keyword which: makes the variable as a class variable.

Write the memory capacity (storage size) of short and float data type in bytes.

Identify and name the following tokens:

(i) public
(ii) ‘a’
(iii) ==
(iv) {}

Differentiate between if else if and switch-case statements.

Give the output of the following code:

String P = “20”, Q = “19”,
int a = Integer .parselnt(P);
int b = Integer. valueOf(Q);
System.out.println(a+””+b);

What are the various types of errors in Java?

State the data type and value of res after the following is executed :

char ch = ‘9’;
res = Character. isDigit(ch)

What is the difference between the linear search and the binary search technique?

Write a Java expression for the following : |x²+2xy| 

Write the return data type of the following function: startsWith( )

Write the return data type of the following function: random( )

If the value of basic=1500, what will be the value of tax after the following statement is executed?

tax = basic > 1200 ? 200 : 100

Give the output of following code and mention how many times the loop will execute?

int i;
for(i=5; i> =l;i~)
{
if(i%2 ==1)
continue;
System.out.print(i+ ”
}

State a difference between call by value and call by reference. 

Give the output of the following:
Math.sqrt(Math.max(9, 16))

Write the output for the following :

String s1 = “phoenix”; String s2 =”island”;

System.out.prindn (s1.substring(0).concat (s2.substring(2)));

System.out.println(s2.toUpperCase( ));

Evaluate the following expression if the value of x = 2,y = 3 and z = 1.
v = x + – z + y + + + y.

String x[ ] = {“Artificial intelligence”, “IOT”, “Machine learning”, “Big data”};
Give the output of the following statements:

(i) System.out.prindn(x[3]);
(ii) System.out.prindn(x.length);

What is meant by a package? 

Give an example of a package.

Name any two Java application programming interface packages. 

Design a class name ShowRoom with the following description :
Instance variables/ Data members :

String name – To store the name of the customer
long mobno – To store the mobile number of the customer
double cost – To store the cost of the items purchased
double dis – To store the discount amount
double amount – To store the amount to be paid after discount
Member methods: –
ShowRoom() – default constructor to initialize data members
void input() – To input customer name, mobile number, cost
void calculate() – To calculate discount on the cost of purchased items, based on following criteria

void display() – To display customer name, mobile number, amount to be paid after discount
Write a main method to create an object of the class and call the above member methods.

Using the switch-case statement, write a menu driven program to do the following :

(a) To generate and print Letters from A to Z and their Unicode Letters Unicode

(b) Display the following pattern using iteration (looping) statement: 1

Write a program to input 15 integer elements in an array and sort them in ascending order using the bubble sort technique. 

Design a class to overload a function series() as follows: 

(a) void series (int x, int n) – To display the sum of the series given below:
x¹ + x² + x³ + ……………. xⁿ terms

(b) void series (int p) – To display the following series:
0, 7, 26, 63 p terms.

(c) void series () – To display the sum of the series given below:

`1/2 + 1/3 + 1/4 .....1/10`

Write a program to input a sentence and convert it into uppercase and count and display the total number of words starting with a letter ‘A’.

Example:
Sample Input: ADVANCEMENT AND APPLICATION OF INFORMATION TECHNOLOGY ARE EVER CHANGING.
Sample Output: Total number of words starting with letter A’ = 4.

A tech number has even number of digits. If the number is split in two equal halves, then the square of sum of these halves is equal to the number itself. Write a program to generate and print all four-digit tech numbers.

Example :
Consider the number 3025
Square of sum of the halves of 3025 = (30+25)²
= (55)²
= 3025 is a tech number.