Rupa Pandit solutions for कम्प्युटर एपलीकेशंस [इंग्रजी] इयत्ता १० आयसीएसई chapter 1 - Revision of Class 9 Syllabus [Latest edition]

These are values of type True or False:

______ encapsulate state and behaviour.

Identify the true statement.

______ is not a primitive.

These are names given to variables, classes, and methods:

______ access specifier does not allow any member to be accessed out of the class.

Which of the following is an example of implicit type casting?

Which of the following is a logical operator?

Which of the following is a relational operator?

Keyword new is used for ______.

Given p = 6.9;

Data type of p can be

Given: g = ++p + y++ + ++y + p++ + x++;

If p = 2, y = 3, x = 5 then what will be the value of g?

It is an ability to have same name but to behave differently under different situations:

It is an ability to apply the method without knowing the method details:

It is a feature in which a derived class is being able to access data/methods of its base class:

It is an instance of a class:

It is a feature in which all relevant data and methods are present in a boundary:

It is a factory where objects are made:

It is not a primitive data type:

It is not a valid identifier:

It is a valid identifier:

It is not a relational operator:

The expression which uses >= operator is known as:

Relational operators are:

State the type of loop in the given program segment

for (int i = 5;i! = 0; i = 2)

System.out.println(i);

A Identify the type of operator &&:

What value will Math.sqrt (Math.ceil (15.3)) return?

The code obtained after compilation is known as ______.

The absence of which statement leads to fall through situation in switch case statement?

Missing a semicolon in a statement is what type of error?

Consider the following program segment and select the output of the same when n = 10:

switch(n)
{Case 10: System.out.println(n*2);
case 4: System.out.println(n*4); break;
default : Syslem.out.println(n);
}

The number of bits occupied by the value ‘a’ are:

Assertion (A): In java statements written in lower case letter or upper case letter are treated as the same.

Reason (R): Java is a case sensitive language.

Assertion (A): Use of escape sequence becomes necessary in programs at a certain point in time.

Reason (R): Certain non-graphic characters cannot be typed directly through the keyboard.

State True or False.

Shift operators are applied on numbers and they shift the integer equivalent of the number.

State True or False.

Keyword default is used to allocate memory to an object.

State True or False.

A condition is a statement that gives an integer result.

State True or False.

In ‘switch case’, only condition of equality can be tested.

State True or False.

In ‘switch case’, default is optional.

State True or False.

In ‘if.. else’, all types of data can be used.

State True or False.

In ‘switch.. case’, two variables can be compared.

State True or False.

‘Fall Through’ is possible in ‘if..else’

State True or False.

In ‘switch.case’, break is necessary after each case.

State True or False.

In a loop, break takes the control statement out of the loop block.

Evaluate the following expression where prefix and postfix increment and decrement operator is used.

int b = 6, d = 12,c = 0; 

c = b++ + d-- + ++ b; 

System.out.println ("B=" + b+" D=" + d+" C=" +c);

Evaluate the following expression where prefix and postfix increment and decrement operator is used.

int p=3, q=20, r=0; 

r = ++p + p++ + q++ + q++;

System.out.println ("P=" + p+ “Q="+ q+ “R="+ r);

Evaluate the following expression where prefix and postfix increment and decrement operator is used.

int cm = 24, dc  = 5, re = 8, bq = 1;

bq = cm/++dc + cm/re--; 

System.out.printn("CM=" +cm +"DC=" +dc+" RE=" +re +“BQ=" +bq);

Evaluate the following expression where prefix and postfix increment and decrement operator is used.

int rd=206, tf=20, yg=3, km=0;

km = rd % tf++ + tf % ++yg ;

System.out.println ("RD=" +rd+ "TF=" +tf+ “YG=" +yg+ "KM=" +km);

Evaluate the following expression as per Java priority & associativity.

6 * 2 / 4

Evaluate the following expression as per Java priority & associativity.

35 % 6 * 7 / 5

Evaluate the following expression as per Java priority & associativity.

49  − 28 − 4 * 3

Evaluate the following expression as per Java priority & associativity.

52 * 7 % 7

Evaluate the following expression as per Java priority & associativity.

79 % 2 + 2 %  79

Evaluate the following expression as per Java priority & associativity.

1234 % 100 – 1234/100

Evaluate the following expression as per Java priority & associativity.

50 % 9 + 50  %  8 + 50 % 7

Evaluate the following expression as per Java priority & associativity.

24 % (3*2)

Evaluate the following expression as per Java priority & associativity.

6598 / (20 % 8)

Evaluate the following expression as per Java priority & associativity.

22 + 33 – 11 – 10 * 2

What will be the output of the given Java code after the calculation [note the data types]?

int m = 62, k = 10,r = 0, q = 0; 

r = m/k;

q = k/m;

System.out.println ("R=" +r+ “Q=" +q);

What will be the output of the given Java code after the calculation [note the data types]?

double d = 43, f = 86, g = 0,h = 0; 

g = d/f; 

h = f/d; 

System.out.println ("G=" +g+ "H=" +h);

What will be the output of the given Java code after the calculation [note the data types]?

int b = 300, a = 150 ; double w = 0,p = 0; 

w = b/a;

p = a/b;

System.out.println ("W=" +w+ "P=" +p);

What will be the output of the given Java code after the calculation [note the data types]?

double c = 300, d = 150; int y = 0, g = 0;

y = c/d;

g = d/c;

System.out.println ("Y=" +y+ "G=" +g);

What will be the output of the given Java code after the calculation [note the data types]?

double fw = Math.pow (3,Math.ceil(2.12)); 

System.out.println ("FW=" + fw);

What will be the output of the given Java code after the calculation [note the data types]?

double mh = Math.sqrt (Math.max (6+3*10, 30−2*5+5));

System.out.println ("MH=" + mh);

What will be the output of the given Java code after the calculation [note the data types]?

double ph = Math.ceil(23.7*2) + Math.floor(32.4/2); 

System.out.println("PH=" +ph);

What will be the output of the given Java code after the calculation [note the data types]?

double gm = Math.round (Math.min (Math.pow (2.3, 2), Math.sqrt(62.5)));

System.out.println ("GM=" +gm);

What will be the output of the given Java code after the calculation [note the data types]?

double cy = Math.ceil (Math.cbrt(0.125), Math.sqrt(0.64));

System.out.println("CY=" +cy);

What will be the output of the given Java code after the calculation [note the data types]?

double kv = Math.abs(Math.min(Math.floor(9.9), Math.ceil(9.9))−Math.round(24.6)); 

System.out.println ("KV=“ +kv);

Given below is the program with errors in it. Identify the errors. Rewrite the program and predict the output.

import java.util.*
class Prog 1
{
       void main
       {
           int A, B, С;
           Scanner sc=new Scanner(System.in ());
           System.out.print("\n Enter the value of A : ");
           A = sc.nextInt();
           System.out.print("\n Enter the value of B: ");
           B = sc.nextInt();
           If (A<B)
           {
              C=A;
           }
           else
           {
              C=B;
           }
           else
           {
           C=C;
           }
           System.out.print("\n The largest is="+C);
       }
}

Given below is the program with errors in it. Identify the errors. Rewrite the program and predict the output.

import java.util.*
class Program
{
       int A, B, C;
       Scanner sc = new Scanner.System.in;
       System.out.print("\n Enter the value of A: ");
       A = sc.nextInt();
       If (A % 10=0 )
       {
           System.out.println(" A is an Even number ");
           else
           {
              System.out.println(" A is an Odd number ");
           }
       }
}

Given below is the program with errors in it. Identify the errors. Rewrite the program and predict the output.

import java.util.*;
class
{
     main()
     {
        int p=0, q=0;
        Scanner sc = scanner (System.in);
        System.out.print ("Enter p :");
        p = nextInt();
        System.out.print ("Enter q :");
        p = nextInt();
        if(p/q=0)
        {        
           System.out.print(q "is a factor of" p);
        }
        else if
        {
           System.out.print (q "is NOT a factor of" p);
        }
     }
}

Given below is the program with errors in it. Identify the errors. Rewrite the program and predict the output.

import java.util.*;
Class Program 4
{
      void main()
      {
          int n=0, p; Scanner sc = new Scanner (System.in);
          System.out.print(" Enter n : "); n == sc.nextInt();
          for(j=1; j<=10; j++)
          p=nxj;
          System.out.println (p + "x"+j+"= "+i);
      }
}

Given below is the program with errors in it. Identify the errors. Rewrite the program and predict the output.

import java.util.*;
class ProGram
{
      void main()
      {
         int n=0, tn = 0, p = 0 ; Scanner sc = new Scanner (System.in);
         System.out.print("\n Enter total terms (n) :");n = sc.nextInt();
         for(tn = n; tn<=1; tn--)
         {
             p =p*tn;
             System.out.print("Factorial of n =" + p );
         }
      }
}

Write the output of the following program code.

int r=0, с=0;
for (r=1; r<=6; r++)
{
    for(c=6; с>= r; c--)
    {
       System.out.print(" "+c) ;
    }
    System.out.println ();
}

Write the output of the following program code.

int r=0, c=0;
for (r=1; r<=5; r++)
{
    for(c=1; c<=r; c++)
    {
      System.out.print(" "+c);
    }
      System.out.println ();
}

Write the output of the following program code.

int r=0, c=0;
for (r=6; r<=10; r++)
{
   for(c=6; c<=r; c++)
   {
      System.out.print(" "+c);
   }
    System.out.println ();
}

Write the output of the following program code.

int r=0, c=0;
for (r=9; r>=5; r--)
{
    for(c=9; c>=r; c--)
    {
      System.out.print(" " + c);
    }
    System.out.println ();
}

Define a class to accept a 3 digit number and check whether it is a duck number or not.

Note: A number is a duck number if it has zero in it.

Rewrite the following program segment using logical operators:

if (x>5)
if (x>y)
System.out.println (x+y);

WAmicable Number Definition: The number n is amicable if it belongs to an amicable pair. Two numbers n and m are called an amicable pair if the sum of all positive divisors of n and the sum of all positive divisors of m are equal to (n + m).

First ten such numbers: 220, 284, 1184, 1210, 2620, 2924, 5020, 5564, 6232, 6368. Declare a class named Numbers contain a method AmicableNos(int, int) that will check both the numbers are of Amicable pairs or not. Appropriate error message should be given in case.

Give the output of the following program segment:

int n = 4279; int d;
while(n>0)
(d=n%10;
System.out.println(d);
n=n/100;
}

Write the value of n after execution:

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

Write the Java expression for (a + b)^x.

Evaluate the expression when the value of x = 4:
x* = − − x + x + + + x

Convert the following do-while loop to a for loop:

int x=−10;
do
{x−−;
System.out.print(x);
}while (r>=1);

Rewrite the following code using the if-else statement: 

int m = 400;
double cl). = (m>300) ? (m/10.0) * 2:(m/20.0)−2;

Define a class to overload the function print as follows:

Define a class to accept values in integer array of size 10. Find sum of one-digit numbers and sum of two-digit numbers entered. Display them separately.

Example: Input: a[] = {2, 12, 4, 9, 18, 25; 3, 32, 20, 1}
Output: Sum of one-digit numbers: 2 + 4 + 9 + 3 + 1 = 19
Sum of two-digit numbers: 12 + 18 + 25 + 32 + 20 = 107