ICSE Computer Application - Class X - 2019 PYQ

(a) Name any two basic principles of Object-oriented Programming.

Answer

1. Encapsulation
2. Inheritance

(b) Write a difference between unary and binary operator.

(c) Name the keyword which:

1. indicates that a method has no return type.
2. makes the variable as a class variable

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

(e) Identify and name the following tokens:

(a) Differentiate between if else if and switch-case statements

(b) Give the output of the following code:

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

(c) What are the various types of errors in Java?

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

char ch = '9';
res= Character.isDigit(ch);

(e) What is the difference between the linear search and the binary search technique?

(a) Write a Java expression for the following:

\[ \lvert x^2 + 2xy \rvert \]

(b) Write the return data type of the following functions:

1. startsWith()
2. random()

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

tax = basic > 1200 ? 200 :100;

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

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

(e) State a difference between call by value and call by reference.

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

(g) Write the output for the following:

String s1 = "phoenix"; String s2 ="island";
System.out.println(s1.substring(0).concat(s2.substring(2)));
System.out.println(s2.toUpperCase());

(h) Evaluate the following expression if the value of x=2, y=3 and z=1.

  v=x + --z + y++ + y

(i) String x[] = {"Artificial intelligence", "IOT", "Machine learning", "Big data"};

Give the output of the following statements:

1. System.out.println(x[3]);
2. System.out.println(x.length);

(j) What is meant by a package? Give an example.

(h) Evaluate the following expression if the value of x=2, y=3 and z=1.

  v=x + --z + y++ + y