Guess Paper – 2008

Class – X

Subject – Computer Applications    

 

F.M – 100                                                                                                                                           Time – 2 Hrs.

 

(Section – A)

 

 

(Attempt all)

 

Q1. Differentiate between :                                      [2*5]

i)   Infiniti loop  and  Empty loop

ii)  Character.toUpperCase  ( ) and  Character.isUpperCase( )

iii) Call by value  and  Call by referance

iv) Instance Variable  and  Local Variable

 v) compareTo( )  and  equals( )

Q2. Answer the following with example:                [2*5]

      i)  In what circumstances a variable is said to be ‘invalid’ ?        

      ii) What is a ‘mixed expression’ ?                                                

      iii) What do you mean by ‘type casting’?                                    

      iv) What do you mean by ‘encapsulation’?                     

       v)  What do you mean by ‘this’ keyword ?                    

 Q3.  Write short answers:                                        [2*6]   

i) What is the similarity between Loigical and relational operators ?      

ii)  What is the significance of ‘default’ clause in a switch statement ?  

iii) What is the effect of absence of ‘break’ in a switch statement ?       

iv) What do you mean by ‘recursive  method’ ?                                      

v)  What do you mean by ‘abstraction’ ?                                                 

Q4. Write the output:                                                [1*6]

i) System.out.println(“Sevana Krishna Kumar”. substring( 7,14 ));

ii) String n = new String ( “Golden Boy”);

    System.out.println( n . toUpperCase( ));

iii) int a = 2 , b = 3 , c = 9 ;

     System.out.println( a – ( b + + ) * ( - - c ));

iv) int a = 2 , b = 3 , c = 9 ;

     System.out.println( a * ( + + b ) % c );

v)  System.out.println(Character.isWhitespace("shooting".charAt(0)));

vi) System.out.println(“Encouragement and motivation”.indexOf( ‘o’, 6));

Q5. i) Multiple initialization and update expression is possible in For loop.  (T/F)               [1]

       ii) ASCII code of  7 is _____.                                                                                         [1]

       iii) An escape sequence is represented by a :                                                                   [1]

            (a) backslash( )          (b) forwardslash( / )    (c) pipeline ( | )        (d) none

      iv)  1  XOR  1  returns      (a) 0                 (b) 1     (c) –1               (d) all                           [1]

( Section – B )

( Attempt any four )

 

Write List of the Variables / Variable Description for each Programs.

 

Q6. A little girl wants to display her name “Shalini Prabha Dutta” in the following manner on the screen. Write

a class for that little girl to display her name as she desires.                                                                    [15]

Shalini

Shalini Prabha

Shalini Prabha Dutta

 

Q7.  Write a class to find the volume of a solid bodies such as cylinder, cone and sphere having the function

name volume ( ) using overloading methods  volume (float, int), volume ( float , float ) and volume (float)

respectively.                                                                                                                                           [15]

 pi                    –          3.14                             Cylinder          –          pi *  r ² * h

Cone                –          1 / 3 * pi * r ² * h         Sphere             –          4 / 3 * pi * r ³              

 

Q8.  Write a class to accept a string , count  the words containing more than two characters which  begins with a

vowel(ignore cases). Eg.  – India won the gold medal  in the shooting event of  Beijing Olympics - 08

output – No. of words – 3   and   Words are – India  event  Olympics                                                            [15]

Q9.  Write a class to input a sentence and two words in String s,w1 and w2 respectively. Then replace w1 (if 

         present, ignoring cases) with w2 and display both the input and converted sentences.                       [15]

 

Q10.  Write a class to accept a multi digit number and a digit in int n  and  int d respectively and do as

directed.                                                                                                                                              [15]

i)          Count and print how many times the digit d is present

ii)        Replace all the d’s with d+1 and display both old and new numbers.

 

Q11. Write a java class salary  to calculate the income tax by taking monthly salary of an employee by taking as

         data members based on the following conditions:                                                                                [15]

         Data members    double sal  and double  tax

         salary ( double n) - accept salary and initialize sal.

         void disp ( )  display monthly salary and tax.               

         void cal ( ) calculate tax

Annual income(Rs)                                 Tax

Upto 130000                                            No tax

Between 130000 – 200000                      15% of the amount exceeding over Rs.130000

From 200000 – 250000                           Rs. 5000 + 20% of the amount exceeding over Rs. 200000

Above  250000                                        30% of the amount exceeding Rs.250000

 

 

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• MCSL-54 Laboratory Course
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