(English Medium) ICSE Class 10 - CISCE Important Questions for Computer Applications

What is meant by a package? 

Name any two basic principles of Object-oriented Programming.

Name any two OOP’s principles.

What are identifiers?

What are keywords ? Give an example.

Name the type of error ( syntax, runtime or logical error) in each case given below: 

(i) Math.sqrt (36 – 45)
(ii) int a;b;c;

Write a function prototype of the following: 

A function PosChar which takes a string argument and a character argument and returns an integer value.

Give the output of the following expression:
a+= a++ + ++a + -- a + a--; when a = 7;

Using the switch statement, write a menu-driven program for the following: 

(i) To print Floyd’s triangle [Given below]

1

2      3

4      5       6

7      8       9      10

11    12    13     14    15

(ii) To display the following pattern:

I

I     C

I     C      S

I     C      S     E

For an incorrect option, an appropriate error message should be displayed. 

Which of the following are valid comments ?

(i) /* comment */
(ii) /* comment
(iii) / / comment
(iv) */ comment */ 

Give two differences between the switch statement and the If-else statement.

A mechanism where one class acquires the properties of another class:

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()?

Why is an object called an instance of a class?

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

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

What is the value of xl if x=5?
x1 = + +x – X+ + + –x

What is the type of casting shown by the following example: 

char c = (char) 120;