Sample paper 4 for ICSE computer Application class X

Sample paper 4 for ICSE computer Application

SUB: COMPUTER                         FOR CLASS X                                   MARKS: 100

This paper is divided into two sections. You are to answer all the questions from section A, and any four from section B.

Section A(40 marks)

Attempt all questions

Question 1.                                                                                                               [2X5=10]

a) Differentiate between call by value or pass by value and call be reference or pass by reference.

b)Write an expression in Java for

         5x³ + 2y

z = ------------------

         x + y

c)What are library classes? Give an example.

d) What is an exception? Name 2 exception handling blocks.

e) Find the errors in the given program segment and rewrite the statements correctly to assignvalues to an integer array:-

int a= new int(5);

for(inti=0;i<=5;i++) a[i]=i;

Question 2.                                                                                                               [2X5=10]

a) Operators with higher precedence are evaluated before operators with relatively lowerprecedence. Arrange the operators given below in order of higher precedence to lowerprecedence.

i) &&               ii) %                iii) >=              iv) ++

b) What is a constructor? When is it invoked?

c)Complete the code below to create an object of Scanner class.

Scanner sc= ________ Scanner( ________________)

d) Name the search or sort algorithm that:

i) Makes several passes through the array, selecting the next smallest item in thearray each time and placing it where it belongs in the array.

ii) At each stage, compares the sought key value with the key value of the middleelement of the array.

e) State the output of the following program segment.

String s= "Examination";

int n= s.length();

System.out.println(s.startsWith(s.substring(5,n)));

System.out.println(s.charAt(2)== s.charAt(6));

Question 3.                                                                                                               [2X5=10]

a) List the variables from those given below that are composite data types.

i) Static int x;

ii) arr[i]=10;

iii) obj.display();

iv) Boolean b;

v) private char chr;

vi) String str;

b) What are the final values stored in x and y below?

double a= -6.35;

double b= 14.74;

double x=Math.abs(Math.ceil(a));

double y=Math.rint(Math.max(a,b));

c)Rewrite the following program segment using while instead of for statement.

int f=1,i;

for(i=1;i<=5;i++)

{

f*=i;

System.out.println(f);

}

d)State the total size in bytes, of the arrays a[4] of char data type and p[4] of float data type.

e) What is the difference between / and % operator?

Question 4.                                                                                                               [2X5=10]

a)What is the result stored in x, after evaluating the following expression

int x=5; x=x++ * 2 + 3 * --x

b)Write the difference between length and .length() function.

c) Analyse the following program segment and determine how many times the loop will beexecuted and what will be the output of the program segment.

int k=1,i=2;

while(++i<6)

k*=i;

System.out.println(k);

d) If intn[ ] = { 1,2,3,5,7,9,13,16}, what are the values of x and y?

x = Math.pow(n[4], n[2]);

y= Math.sqrt(n[5]+n[7]);

e)

i) Name the mathematical function which is used to find sine of an angle given in radians.

ii) Name a string function which removes the blank spaces provided in the prefix andSuffix of a string.

Section B

Attempt any 4 questions from this section

Each program should be written using a variable list so that the logic of the program is clearlydepicted.

Question 5.

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

i) double series(double n) with one double argument and returns the sum of the series,

sum= 1/1 + 1/2 +1/3 + …. 1/n

ii) double series(double a, double n) with 2 double arguments and returns the sum of theseries, sum = 1/a² + 4/a⁵ + 7/a⁸ + 10/a¹¹+…… to n terms                                   [15 ]

Question 6.

Write a program to assign a full path and file name as given below. Using library functions, extractand output the file path, file name and file extension separately as shown.

Input C:\Users\admin\Pictures\flower.jpg

Output Path: C:\Users\admin\Pictures\

File name: flower

Extension: jpg                                                                                                                   [15]

Question 7.

Write a program to input and store the weight of ten people. Sort and display them inascending order using the selection sort technique.                                                                                                                                                                                                         [15]

Question 8.

Using the switch write a menu driven program to :

i) To find and display all the factors of a number input by the user (including 1 and excluding thenumber itself).

Example:

Sample input : n = 15

Sample output : 1, 3, 5

ii) To find and display the factorial of a number input by the user ( the factorial of a non negativeinteger n , denoted by n!, is the product of all integers less than or equal to n.

Example:

Sample input : n =5

Sample output : 5!=1x2x3x4x5=120

For an incorrect choice an appropriate error message should be displayed.                                                                                                                                                         [15]

Question 9.

Define a class called Library with the following descriptions.

Instance variables/Data members:

Intacc_num stores the accession number of the book.

String title stores the title of the book.

String author stores the name of the author

Member methods:

i) void input() to input and store the accession number, title and author.

ii) void compute() to accept the number of days late, calculate and display the finecharged at the rate of Rs.2/- per day.

iii) void display() to display the details in the following format.

Accession Number             Title                 Author

Write a main method to create an object of the class and call the above member methods.                                                                                                                     [ 15 ]

Question 10.

The International Standard Book Number (ISBN) is a unique numeric book identifier which is printedon every book. The ISBN is based upon a 10 digit code. The ISBN is legal if :

1 x digit1 + 2 x digit2 + 3 x digit4 + 4 x digit4 + 5 x digit5 + 6 x digit6 + 7 x digit7 + 8 x digit8 + 9 x digit9 +10 x digit10 is divisible by 11.

Example: For an ISBN 1401601499

Sum = 1 x 1 + 2 x 4 + 3 x 0 + 4 x 1 + 5 x 6+ 6 x 0+ 7 x 1+ 8 x 4 + 9 x 9 + 10 x 9 = 253 which is divisible by11.

Write a program to :

i) Input the ISBN code as a 10 – digit integer.

ii) If the ISBN is not a 10 digit integer, output the message, “Illegal ISBN” and terminate theprogram.

iii) If the number is 10-digit, extract the digits of the number and compute the sum asexplained above.

If the sum is divisible by 11, output the message, “Legal ISBN”. If the sum is not divisibleby 11, output the message, “Illegal ISBN”.                                                                                                                                                                                              [15]