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

Name the wrapper class of char type. 

 Define abstraction.

Write a difference between the functions isUpperCase() and toUpperCase().

Classify the following as primitive or non-primitive data type:

char 

int res = ‘A’; 

What is the value of res?

Write the return data type of the following function:

log( )

Write a program to accept a number and check and display whether it is a Niven number or not. 
(Niven number is that number which is divisible by its sum of digits).
Example:
Consider the number 126.
The Sum of its digits is 1+2+6 = 9 and 126 is divisible by 9.

State one difference between the floating point literals float and double.

What is the data type returned by the library function?
compareTo()

What will be the output when the following code segment is  executed?
String s = “1001”;
int x = Integer. valueOf(s);
double y = Double.valueOf(s);
System.out.println(“x=”+x);
System.out.println(“y=”+y); 

What will be the output when the following code segment is executed?

System.out.println(“The king said\”Begin at the beginning!\“to me.”);

Design a class to overload a function area( ) as follows:
(i) double area (double a, double b, double c) with three double arguments, returns the area of a scalene triangle using the formula:

area = `sqrt ("s" ("s" - "a")("s" - "b")("s" - "c"))  "2ab"`

where `"s" = ("a" + "b" + "c")/2`

(ii) double area (int a, int b, int height) with three integer arguments, returns the area of a trapezium using the formula:

area = `1/2` height (a+b)

(iii) double area (double diagonal 1, double diagonal 2) with two double arguments, returns the area of a rhombus using the formula :

area = `1/2` (diagonal 1 × diagonal 2)

Corresponding wrapper class of int data type is ______

Give the output of the following code.

String A = "26.0", B= "74.0";

double C = Double.parseDouble(A);

double D = Double.parseDouble(B);

System.out.println((C+D));

Wrapper classes are available in ______ package.

Predict the output of the following code snippet: String P = "20", Q = "22";

int a = Integer.parseInt(P);

int b = Integer.value0f(Q);

System.out.println(a + " " + b);

Give the output of the following Character class method:

Character.toUpperCase('a')

Give the output of the following Character class method:

Character.isLetterOrDigit('W')

Write the value of n after execution:

char ch = 'd';
int n = ch + 5;

When an object of a Wrapper class is converted to its corresponding primitive data type, it is called as ______.