CBSE class XII computer Science Imp. Questions 2008




Q. 1. Differentiate between a run-time error and syntax error. Give one example of each.

[Hint : Losic & Syntax]

Q. 2. Differentaite between a data type struct and a data type class in C++. What is the need for a constructor function in an object.

[Hint : Structures & Classes]

Q. 3. Is it possible to apply Binary Search for any sorted data? Justify.

[Hint : Yes]

Q. 4. Differentiate between a LIFO list and FIFO list.

[Hint : Stacks & Queues]

Q. 5. Write any two differences between Procedural Programming and Object Oriented Programming.

[Hint : Basic & C++]

Q. 6. What is a pointer?

[Hint : Address variable]

Q. 7. What is a Queue?

[Hint : LIFO]

Q. 8. What is the purpose of comments and indentation in a program?

[Hint : Remark]

Q. 9. List four built-in data types available in C++.

[Hint : Data Types]

Q. 10. Why arrays are called static data structure?

[Hint : Arrangs & Data Types]

Q. 11. Distinguish between serial file and a sequential file.

[Hint : File Hadling]

Q. 12. What do you mean by Inheritence?

[Hint : Classes & Derived Classes]

Q. 13. What are constructors & destructors. What purpose do they serve.

[Hint : Class Functions]

Q. 14. Distinguish between an object and a class.

[Hint : Variables & Data Types]

Q. 15. What is the pre-condition for Binary Search to be performed on a single dimensional array? [Hint : sorting]

Q. 16. Differentiate between a Character constant and a string literal or constant.

[Hint : String]

Q . 17. Differentiate between the privately & publicly derived visibility modes.

[Hint : Local & Global]

Q. 18. What is meant by linear data structure?

[Hint : Serial Data]

Q. 19. What is a Deque?

[Hint : Data Structures]

Q. 20. Differentiate between privately and publicly derived visibility modes.

[Hint : Data Hiding]

Q.21. What is a copy constructor.

[Hint : Member Function]

Q.22. Define the term sorting and searching.

[Hint : Arranys]

Q. 23. Differentiate between static data structure & dynamic structure.

[Hint : Data Types]

Q. 24. Define the following terms: Inheritance & Encapsulation.

[Hint : OOP]

Q. 25. What is a copy constructor. What do you understand by constructor overloading.

[Hint : Function]

Q. 26. Write two major differences between Object Oriented Programming and Procedural Programming.

[Hint : BASIC&C++]

Q. 27. What do you understand by constructor and destructor functions used in classes. How are these functions different from other member functions.

[Hint : Classes & Objects]

Q. 28. Differentiate between ifstream class and ofstream class.

[Hint : Reading/Writing]

Q. 29. Why main function is special. Give two reasons.

[Hint : Program instractions]

Q. 30. What do you understand by visibility modes in class derivations. What are these modes.

[Hint : Public, Private & Protected]

Q. 31. Differentiate between read( ) & write( ) functions.

[Hint : Read & Write records]

Q. 32. Write two advantages of using include compiler directive.

[Hint : Header Files]

Q. 33. What do you understand by default constructor and copy constructor functions used in classes? How are these functions different from normal constructors?

[Hint : Member functions]

Q. 34. Differentiate between getline( ) & getc( ) functions.

[Hint : String input]

Q. 35. Illustrate the concept of Function Overloading with the help of an example.

[Hint : Multiple Methods]

Q.36. Illustrate the use of the this pointer with the help of an example.

[Hint : Classes & Objects]

Q. 37. Encapsulation is one of the major properties of OOP. How is it implemented in C++.

[Hint : OOP features]

Q. 38. Illustrate the use of “Self Referential Structures” with the help of an example.

[Hint : Data types]

Q. 39. Reusability of classes is one of the major properties of OOP. How is it implemented in C++.

[Hint : Objecters & Classes]

Q .40. Distinguish between: int*ptr=new int(5); & int * ptr= new int[5];

[Hint : Points & Array]

Q .41. Distinguish between ios::out & ios::app.

[Hint : File output/Append]

Q. 42. What is the purpose of Header file in a program.

[Hint : Include functions]

Q. 43. What do you understand by a Base Class and a Derived Class. If a base class and a derived class each include a member function with the same name and arguments, which member function will be called by the object of the derived class if the scope operator is not used.

[Hint : Polymorphism]

Q. 44. Illustrate the concept of Inheritance with the help of an example.

[Hint : OOPS]

Q. 45. What is the difference between put( ) and write( ).

[Hint : Read & Write records]

Q. 46. Will a C compiler always compile C++ code?

[Hint : NO]

Q. 47. Which is not a valid keyword: public, protected, guarded

[Hint : ‘g’]

Q. 48. What is the correct syntax for inheritance

  1. class aclass : public superclass
  2. class aclass inherit superclass
  3. class aclass <-superclass

[Hint : (a)]

Q. 49. What does the following do: for(;;) ;

[Hint : loop]

Q. 50. Of the numbers 12 23 9 28 which would be at the top of a properly implemented maxheap?

[Hint : Arrays]

Q. 51. What does the break; do in the following?

void afunction()
{
if(1)
{
break;
a_function();
cout<<“Err”; } }

[Hint : Breaks loop]

Q. 52. What are pointers, when declared, intialized to?

[Hint : Variable address]

Q. 53. What is the last index number in an array of 100 characters?

[Hint : Array option Bare]

Q. 54. Would you rather wait for quicksort, linear search, or bubble sort on a 200000 element array? (Or go to lunch...)

[Hint : Dry Run]

Q. 55. What does the following algorithm do?

set sum to zero.
set i to 1.
input n.
while i is less than or equal to n do
{
add i to sum.
increment i.
}
output sum.

What would be output if the value entered for n was 0? What would be the effect of reversing the order of the statements in the loop body on the general result produced by the algorithm?

[Hint : Dry Run]

Q. 56. If an array has a 100 elements what is the allowable range of subscripts?

[Hint : Array option base]

Q. 57. What is the difference between the expressions a4 and a[4]?

[Hint : Variable & Arrary]

Q. 58. Write a declaration for a 100 element array of floats. Include an initialisation of the first four elements to 1.0, 2.0, 3.0 and 4.0.

[Hint : Array initialialion of arrays]

Q. 59. An array day is declared as follows:

int day[] = {mon, tue, wed, thu, fri};
How many elements has the array day? If the declaration is changed to
int day[7] = {mon, tue, wed, thu, fri};
how many elements does day have?

[Hint : Array definition]

Q. 60. What would be output by the following section of C++?

int A[5] = {1 , 2, 3, 4};
int i;
for (i=0; i<5;>

[Hint : Dry Run]

Q. 61. What is wrong with the following section of program?

int A[10], i;
for (i=1; i<=10; i++) cin >> A[i];

[Hint : Dry run]

Q. 62. Write a function heading for a function which will double the first n elements of an array. If the function was amended so that it would return false if n was larger than the size of the array how should the function heading be written? If the function was to be changed so that a new array was produced each of whose elements were double those of the input array how would the heading be written?

[Hint : Function definition]

Q. 63. What does the following do: void afunction(int *x)

{
x=new int;
*x=12;
}
int main()
{
int v=10;
afunction(&v);
cout<

[Hint : Dry Run]

Q. 64. What do nonglobal variables default to:

  1. auto
  2. register
  3. static

[Hint : Variable declaeation]

Q. 65. Which header file allows file i/o with streams?

  1. iostream.h
  2. fstream.h
  3. fileio.h

[Hint : File stream]

Q. 66. What is the outcome of cout<

  1. 16
  2. 17
  3. 16.5

[Hint : Dry run]

Q. 67. What will strcmp(“Astring”, “Astring”); return?

[Hint : String compare]

Q. 68. Evaluate !(1&&1||1&&0)

[Hint : Logical Condition]

Q. 69. What header file is needed for exit();

[Hint : Process]

Q. 60. What ANSI C++ function clears the screen?

[Hint : Clrscr]

 

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