ICSE Class X solved model paper for 2018
Model
Paper Solved
Section A (40 Marks)
Attempt all question
Question 1.
a. Define Encapsulation.
Ans: The wrapping of data and function together into a single unit is called
Encapsulation.
b. Name any two OOP’s principles
Ans: Inheritance and Polymorphism
c. Define Object with an example.
Ans: Object: An instance of a class called Object. The table is an
instance of class Furniture.
d. Define class.
Ans: Blue print of an object is called Class. Example, mango, apple, and orange
are members of the class fruit.
e. What is wrapper class? Give example.
Ans: A wrapper class is a class which wraps a primitive data type. Example
Double, Float, Integer
Question 2.
a. What is a class variable?
Ans: Instance variables having the keyword static before it is a class
variable. For every object, there is just one copy of the variable made.
b. What is the significance of import java.io.* in your program?
Ans: The line imports all the classes of the java.io package into the current
program.
c. State the two kinds of data types.
Ans: The two kinds of data types in Java are primitive and reference data
types.
d. Define impure function.
Ans: Impure Function: A function that brings about a change in the argument
that it receives. Its arguments will always be reference types. It may or may
not return value. In other words, an impure function brings about a change in
the state of the function. This change in state is called the side effect of
calling an impure function.
Example:
Static void count(Number num)
{
num.counter=num.counter+1;
}
e. What are comments? Name the different types.
Ans: Comments are statements which enhance the readability and understanding of
the program. They are not part of the program.
The different types are: single line (//….), multiple line (/* … */) and
documenting comment (/**….*/).
Question 3.
a. What is meant by the private visibility of a method?
Ans: The visibility of private method restricted to the class itself. It
is not visible to anywhere outside the class.
b. What is a variable?
Ans: A variable is a named memory location whose value can change. Example int
a,b;
c. What is the use of return keyword?
Ans: A return keyword is used to return any value from a function. It denotes
the end of a function.
d. What is call by value?
Ans: In call by value arguments are passed by the value, which means that a
copy of the arguments is passed to the method can make changes to the value of
this copy but can not change the values of the original variables in the
calling method.
e. What is meant by an infinite loop? Give an example.
Ans: An infinite loop is a loop whose test condition is always true. This type
of loop never ends by itself. For example:
for(i=1;i>0;i++)
{
System.out.println(“Hello”);
}
f. State any two objectives of using Arrays.
Ans: 1. Use hold elements in contiguous memory location. 2. Arrays are
used to group storage locations.
Section B (60 Marks)
Attempt any four questions from this Section
Question 4.
Design a program in Java to calculate the tax for the people living in Mango
city. Specify a class taxpayer whose class description is given below:n[15]
Class
name:
TaxCalculator
Data
members:
int PAN
String
name
double
taxableIncome
double
tax
Member
methods:
inputData()
displayData()
computeData()
The tax is calculated according to the following rules:
Total Annual Taxable Income Rate
of Taxation
Up to 60000
0%
Above 60000 but up
to 150000 5%
Above 150000 but
up to 500000 10%
Above 500000 15%
Solution:
import java.io.*;
/*** class TaxCalculator here.
***/
public class TaxCalculator
{
int pan;
String name;
double taxableIncome;
double tax;
void input()throws IOException
{
InputStreamReader in=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(in);
System.out.println("Enter name and taxable income:");
name=br.readLine();
taxableIncome=Double.parseDouble(br.readLine());
}
void computeData()
{
if(taxableIncome<=60000)
tax=0;
else if(taxableIncome>60000 && taxableIncome<=150000)
tax=taxableIncome*0.05;
else if(taxableIncome>150000 && taxableIncome<=500000)
tax=taxableIncome*0.1;
else
tax=taxableIncome*0.2;
}
void displayData()
{
System.out.println("Display
Data”);
System.out.println("Name
=" + name);
System.out.println("Taxable
Income =" + taxableIncome);
System.out.println("Tax Paid
=" + tax);
}
public static void main(String args[])throws IOException
{
TaxCalculator ob=new
TaxCalculator();
ob.input();
ob.computeData();
ob.displayData();
}
}
Output:
Enter name and taxable income:
Rehan
120000
Display Data
Name=Rehan
Taxable Income=120000.0
Tax Paid=6000.0
Question 5
Write a menu driven program to convert Fahrenheit to Celsius and Celsius to
Fahrenheit.
Solution:
import java.io.*;
import java.io.*;
/**
* Class FahrenToCelsius
*
*/
public class FahrenToCelsius
{
public static void main(String args[])throws IOException
{
int ch,c,f;
InputStreamReader ab=new InputStreamReader(System.in);
BufferedReader br=new
BufferedReader(ab);
// Menu List
System.out.println("Enter 1.
Farenheit to Celsius:");
System.out.println("Enter 2.
Celsius To Farenheit:");
System.out.print("Enter Choice
:");
ch=Integer.parseInt(br.readLine());
// switch statement
switch(ch)
{
case 1:
System.out.print("Enter Temperature in Farenheit :");
f=Integer.parseInt(br.readLine());
c=((f-32)*5)/9;
System.out.println("Temperature in Celsius :"+c);
break;
case 2:
System.out.print("Enter Temperature in Celsius :");
c=Integer.parseInt(br.readLine());
f=(9*c/5)+32;
System.out.println("Temperature in Farenheit :"+f);
break;
}
}
}
Output :
Enter 1. Farenheit to Celsius:
Enter 2. Celsius To Farenheit:
Enter Choice :1
Enter Temperature in Farenheit :100
Temperature in Celsius :37
Enter 1. Farenheit to Celsius:
Enter 2. Celsius To Farenheit:
Enter Choice :2
Enter Temperature in Celsius :100
Temperature in Farenheit :212
Question 6.
Write a class Automorphic to check whether a number is Automorphic or not
using function with the help of a method Int digit(int n)
Solution
import java.io.*;
/**
* class Automorphic
*
*/
public class Automorphic
{
int digits(int n)
{
int c,p,k;c=0;k=0;
while(n!=0)
{
k=n/10;
c=c+1;
n=k;
}
return(c);
}
public static void main(String args[])throws IOException
{
InputStreamReader read =new
InputStreamReader(System.in);
BufferedReader in =new
BufferedReader(read);
int m,n,p,b;
double r;
r = 0;
Automorphic ob= new Automorphic();
System.out.println("Enter your
no.");
n=Integer.parseInt(in.readLine());
m= n;
p= m * m;
b=ob.digits(n);
r=p % (Math.pow(10,b));
if(m==r)
System.out.println(m + " is an Automorphic no.");
else
System.out.println(m + " is not an Automorphic no.");
}
}
Output;
Enter your no.
625
625 is an Automorphic no.
Enter your no.
525
525 is not an Automorphic no.
Question 7
A cloth showroom has announced the following festival discounts on the purchase
of items based on the total cost of the items purchased:
Total
cost
Discount (in Percentage)
Less than Rs.
2000
5%
Rs. 2001 to Rs.
5000
25%
Rs. 5001 to Rs.
10000
35%
Above Rs.
10000
50%
Write a program to input the total cost and to compute and display the
amount to be paid by the customer after availing the discount. Three methods
also their input(), calculate() and display().
Solution
import java.io.*;
/**
* class Showroom
*
*/
public class Showroom
{
private double cost; // For cost
private double dis; // For Discount
private double amt; // For Amount
void input()throws IOException
{
InputStreamReader in=new
InputStreamReader(System.in);
BufferedReader br=new
BufferedReader(in);
System.out.println("Enter Cost
of the product:");
cost=Double.parseDouble(br.readLine());
}
void calculate()
{
if(cost<=2000)
dis = cost * 0.05;
else if(cost>2000 &&
cost<=5000)
dis = cost * 0.25;
else if(cost>5000 &&
cost<=10000)
dis = cost *0.35;
else
dis = cost * 0.5;
amt= cost - dis;
}
void display()
{
System.out.println("Cost of the
product="+cost);
System.out.println("Discount
given="+dis);
System.out.println("Amount
Paid="+amt);
}
public static void main(String args[])throws IOException
{
Showroom ob=new Showroom();
ob.input();
ob.calculate();
ob.display();
}
}
Output:
Enter Cost of the product:
5630
Cost of the product=5630.0
Discount given=1970.4999999999998
Amount Paid=3659.5
Question 8.
Write a program to enter a sentence. Calculate total Vowel, Space, Consonant,
and word.
Solution.
import java.io.*;
/**
* class SentenceCounter
*
* Vowel, Space, Consonant and word counter program
*/
class SentenceCounter
{
public static void main(String args[])throws IOException
{
String st="";
int i,l,v,c,sp;
char a;
v=c=sp=0;
InputStreamReader in=new InputStreamReader(System.in);
BufferedReader br=new
BufferedReader(in);
System.out.println("Enter a sentence:");
st=br.readLine();
l=st.length();
for(i=0;i<l;i++)
{
a=st.charAt(i);
if(a=='a' || a=='A' || a=='e' || a=='E' || a=='i' || a=='I' || a=='o' || a=='O'
|| a=='u' || a=='U')
v++;
if(a==' ')
sp++;
}
c=l-(v+sp);
System.out.println("Total Vowel="+v);
System.out.println("Total Space="+sp);
System.out.println("Total Consonent="+c);
System.out.println("Total Words="+(sp+1));
}
}
Output:
Enter a sentence:
the quick brown fox jumps over a lazy hungry dog
Total Vowel=13
Total Space=9
Total Consonent=27
Total Words=10
Question 9.
Define a class Employee having the following description :
Instance variables :
int pan – to store personal account number
String name – to store name
double taxIncome – to store annual taxable income
double tax – to store tax that is calculated
Member functions :
input ( ) – Store the pan number, name, taxable income
calc( ) – Calculate tax for an employee
display ( ) – Output details of an employee
Write a program to compute the tax according to the given conditions and
display the output as per given format.
Total Annual Taxable Income Tax Rate
Upto Rs,
1,00,000
No tax
From 1,00,001 to
1,50,000
10% of the income exceeding Rs. 1,00,000
From 1,50,001 to
2,50,000
Rs. 5000 + 20% of the income exceeding Rs. 1,50,000
Above Rs.
2,50,000
Rs. 25,000 + 30% of the income exceeding Rs. 2,50,000
Output :
Pan Number
Name
Tax-income
Tax
=======
==========
=========
=====
=======
==========
=========
=====
=======
==========
=========
=====
Solution
import java.io.*;
/**
* class Employee
*
*
*/
class Employee
{
// instance variables
int pan;
String name;
double taxIncome, tax;
// read the data from keyboard
public void input()throws IOException
{
InputStreamReader in = new
InputStreamReader(System.in);
BufferedReader br = new
BufferedReader(in);
System.out.println("Enter the
name, pan and taxable income : ");
name = br.readLine();
pan =
Integer.parseInt(br.readLine());
taxIncome =
Double.parseDouble(br.readLine());
}
// Method calculate tax
public void calc()
{
tax = 0.0;
if( (taxIncome > 100000)
&& (taxIncome <= 150000) )
tax = (taxIncome -
100000) * 0.1;
else if( (taxIncome > 150000)
&& (taxIncome <= 250000) )
tax = 5000.0 +
(taxIncome - 150000) * 0.2;
else
tax = 25000.0 +
(taxIncome - 250000) * 0.3;
}
// display details of an employee
public void display()
{
System.out.println("Pan
Number
Name
Tax-income Tax");
System.out.println(pan+"
" + name +
"
" + taxIncome + " " + tax);
}
// Main method
public static void main(String args[])throws IOException
{
Employee ob=new Employee();
ob.input();
ob.calc();
ob.display();
}
}
Output:
Enter the name, pan and taxable income :
Abdulla
20938
150000
Pan Number
Name
Tax-income Tax
20938
Abdulla
150000.0 5000.0
