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

What are the various types of errors in Java?

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( ));

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);

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.

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.

Name the operators listed below are
(i) <
(ii) + +
(iii) &&
(iv) ? :

Write one difference between / and % operator.

String x[] = {“SAMSUNG”, “NOKIA”, “SONY”, “MICROMAX”, “BLACKBERRY”};

Give the output of the following statements:

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

Write a Java expression for the following :
ax⁵ + bx³ + c 

Write the output for the following :

String s= “Today is Test”;
System.out.println(s.indexOf(‘T’)); System.out.println(s.substring(0, 7) + ” ” + “Holiday”);

State the difference between == operator and equals () method. 

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

(i) To find and display the sum of the series given below :
S = x¹ -x² + x² – x⁴ + x⁵ – x²⁰ 
(where x = 2)
(ii) To display the following series :
1 11 111 1111 11111
For an incorrect option, an appropriate error message should be displayed.

Give the output of the following string functions:

1. "MISSISSIPPI".indexOf('S') + "MISSISSIPPI".lastIndexOf('I')
2. "CABLE".compareTo("CADET") 

Write down java expression for:

`"T" = sqrt("A"^2 + "B"^2 + "C"^2)`

Rewrite the following using ternary operator:

if (x%2 == o)
System.out.print(“EVEN”);
else
System.out.print(“ODD”);

Write the return data type of the following function:

endsWith( )

Write a Java expression for the following :

`sqrt(3"x"+"x"^2)/"a+b"`

What is the function of catch block in exception handling? Where does it appear in a program?

State the output when the following program segment is executed:

String a = "Smartphone", b = "Graphic Art"; 
String h = a.substring(2, 5); 
String k = b.substring(S).toUpperCase(); 
System.out.println(h); 
System.out.println(k.equalsignoreCase(h));