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CBSE Class 12 Computer and Communication Technology Solved Question Paper 2012

Multiple Choice Questions

What out of the following, will you use to have an audio-visual chat with an expert sitting in a faraway place to fix-up a technical issue?

VoIP
email
FTP

204 Views

Which out of the following comes under Cyber Crime?

Operating someone’s internet banking account, without his knowledge.
Stealing a keyboard from someone’s computer.
Working on someone’s computer with his/her permission.

82 Views

Short Answer Type

Give the difference between the Type Casting and automatic Type Conversion. Also, give a suitable C++ code to illustrate both.

86 Views

Which C++ header file(s) are essentially required to be included to run/execute the following C++ source code (Note: Do not include any header file, which is/are not required);

Void main()
{
	char TEXT[] = 'SomeThing';
	cout<<'Remaining SMS Chars:'
	<<160-strlen(TEXT)<< endl;
}

72 Views

Rewrite the following program after removing the syntactical error(s) (if any). Underlie each correction.

#include<iostream.h>
Class Item
{
	long IId,Qty;
public:
	void Purchase
	{
		cin>>IId>>Qty;
	}
}	void Sale()
{
	cout<<setw(5)<<IId<<'Old:'<<Qty<<endl;
	cout<<'New:'<<--Qty<< endl;
}
void main()
{
	Item I;
	Purchase();
	I.Sale();
	I.Sale(0)
}

76 Views

Find the output of the following program:

#include<iostream.h>
class METRO
{
	int Mno, TripNo,PassengerCount;
public:
	METRO (int Tmno=1)
	{
		Mno=Tmno;TripNo=0;PassengerCount=0;
	}
	void Trip(int PC=20)
	{
		TripNo++;PassengerCount+=PC;
	}
	void StatusShow()
	{
		cout<<Mno<<':'<<TripNo<<':'<<PassengerCount<<endl;
	}
};
	void main()
	{
		METRO M(5),T;
		M.Trip();
		T.Trip(50);
		M.StatusShow();
		M.Trip(30);
		T.StatusShow();
		M.StatusShow();
	
	}

113 Views

Find the output of the following program:

#include<iostream.h>
#include<c.type.h>
typeof char Str80[80];
void main()
{
	char*Notes;
	Str80 Str='vR2GooD':
	int L = 6;
	Notes =Str;
	while(L>=3)
	{
		Str[L]=(isupper(Str[L])?tolower(Str[L]):toupper(Str[L]));
		cout<<Notes<<endl;
		L--;
		Notes++;
	}
}

80 Views

Observe the following program and find out, which output(s) out of(i) to(iv) will not be expected from the program? What will be the minimum and the maximum value assigned to the variable chance?

#include<iostream.h>
#include<stdlib.h>
void main( )
{
	randomize( );
	int Arr[]={9,6},N;
	int Chance=random(2)+10;
	for (int C=0;C<2;C++)
	{
		N=random(2);
		cout<<Arr[N]+Chance<<'#';
	}
}

(i) 9#6# (ii) 19#17# (iii) 19#16# (iv) 20#16#

103 Views

9.
What is the difference between the members in private visibility mode and the members in protected visibility mode inside a class? Also, give a suitable C++ code to illustrate both.

Private Public

Private members of a class are accessible only from within other members of the same class or from their friends. Protected members are accessible from members of their same class and from their friends, but also from members of their derived classes.

#include <iostream> 
class Example
{
public:
	int a;
	int add(); private:
	int b;
};
	int Example::add()
{
	return a+b ;
}
void main( )
{
	Example ex;
	ex.a = 10; // OK: because a is public
	ex.b = 20; // Error: because b is private
	int sum=ex.add(); // local variable
	cout << 'Sum of a + b : ' <<
}
Output: Error due to access of
private member

#include <iostream.h> 
class ExBase
{
	protected: int i, j;
};

class ExDerived : public ExBase { public:
	void show()
	{
		i=35; j=45;
		//both i & j are accessible here cout<<'Value of i '<<i; count<<'Value of j '<<j;
	}
};
void main()
{
	ExDerived exd; exd.show();//both I and j are not accessible exd.i=50;
	exd.j=60;
}

88 Views

10.

Answer the question (i) and (ii) after going through the following class :

class Travel
{
	int PlaceCode; char Place[20]; float Charges; public:
Travel( )	//Function 1
{
	PlaceCode=1;strcpy(Place,'DELHI');Charges=1000;
}
void TravelPlan(float C )	// Function 2
{
	cout<<PlaceCode<<':'<<Place<<':'<<Charges<<endl;
}
~Travel( )	// Function 3
{
	cout<<'Travel Plan Cancelled'<<endl;
}
Travel(int PC,char p[],float C)	// Function 4
{
	PlaceCode=PC;strcpy(Place,P);Charges=c;
}

(i) In Object Oriented Programming, what are Function 1 and Function 4 combined together referred as?

(ii) In Object Oriented Programming, which concept is illustrated by Function 3? When is this function called/invoked?

82 Views