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hardest sample paper for computer !!!

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Nisarg Pandya
Zydus School for Excellence (ZSE), Vejalpur, Ahmedabad
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Sample Paper -1 Sample Paper 1 Class X Subject COMPUTER APPLICATIONS SECTION A (All Questions are compulsory ) Q.1.a) What do you know about instance variable? [2] b) What does encapsulation lead to? [2] c) What is a Stream? [2] d) What is the difference in the classes String and StringBuffer? [2] e) What is control variable? [2] Q.2.a) Why is a class known as composite data type? [2] b) What is Recursive method? [2] c) What is Function Signature? [2] d) Differentiate a constructor from a destructor ? [2] e) Which unit of a class gets called when the object of the class is created ? [2] Q.3.a) Encapsulation wraps up the attributes and methods of the object comment. [2] b) Write the prototype of the function that returns a double value and takes three double parameters x, y and z as its parameters. [2] c) In the following statements assume a = 50 , b = 10 and c = 20. The statement is c + = ( a>0 && a<=10 ) ? + + a : a / b ; What is the value of c ? [2] d) A method definition is as shown below : int power ( int x , int y ) { int f = 1 ; for ( int i = 1 ; i <= y ; i + + ) f*=i; return ( f ); } Answer the following : What is the term given to the variables x and y? [1] What is the significance of the type int used before the method name power? [1] Name the type of method shown above. [1] In one line state that what the method shown above is computing? [1] i) ii) iii) iv) Q.4.a) Read the following overloaded method prototypes and answer the question that follow : [2] void calculate ( int x , double y ); void calculate ( double x , double y , double z ); i) Write the java statement to invoke the method calculate using actual parameters a=20 , b=45.52 . ii) Write the java prototype to overload the method calculate to return a double result And accepts three double parameters . b) Write the output of the following: [2] int a[ ] = { 5 , 8 , 7 , 3 , 2 }; a[ 1 ] = a[ 3 ] ; a[ 2 ] = a[ 4 ] ; a[ 3 ] = a[ 1 ] + a[ 2 ] ; for ( int i = 0 ; i < 5 ; i + + ) 1

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