ISC class XI practice paper 3

This is a ISC class XI practice test for computer students. The topics covered in this paper are Boolean Algebra, Logic gates, Number conversions

Matrix programs

Q 1. The National
college of Journalism is offering courses in three different categories of
journalism, which are the print, the web and the broadcasting media.

A
student is eligible to apply if he/she satisfies any one of the following
conditions:

• The student is a graduate in any discipline
  with an aggregate percentage of 75 or above and with a record of literary
  skills.

OR

• The student is a graduate in Mass
  Communication with an aggregate percentage of 75 or above.

The inputs are:

1. Graduate in any
   discipline.
2. Graduate in Mass
   Communication.
3. Aggregate
   percentage of 75 and above.
4. Record of
   Literary skills.

Output:

R-Denotes
eligible to apply[1 indicates Yes and 0 indicates No in all cases]

Draw the truth tables for the inputs and
outputs given above and write the expression with the conjunctive operator for the terms which have
1 in the result column.

Q 2. A coin is tossed
two times. A win is said to occur, if each toss result in ‘HEAD’ otherwise in
all other cases it is a loss. Using the following as:

A=1, if the first
toss result in ‘HEAD’.

A=0, if the first
toss result in ‘TAIL’.

B=1, if the second
toss result in ‘HEAD’.

B=0, if the first
toss result in ‘TAIL’.

S=1, if Win
occurs.

S=0, if the win
does not occurs.

1. Draw a truth table to determine all the possible values of S, depending in the values taken by A and B.        
2. The rule of winning in above problem is modified as follows,                                       

A win is said to
occur if at least one toss result is HEAD, otherwise a loss occurs. Construct a
truth table for the revised winning rule and write the terms using conjunction
operator for the true result columns(1’s).

isc class xi practice test 3

Q 3. a) The following function is a part of some class. It returns the value 1 when the number is an Armstrong number, otherwise it returns 0.

class Armstrong

{

/* An armstrong number is a number which is equal to
the sum of the cube of its individual digits*/

int arms(int n)

{

int digit=0, sum=0;
int rem=n; while(?1?)

{

digit=?2?;
sum=sum+?3?; rem=?4?;

}

if(?5?)

return 1;

else return 0;

} }

i)
What is the expression / value at ?1?

ii)
What is the expression / value at ?2?

iii)
What is the expression / value at ?3?

iv)
What is the expression / value at ?4?

v)
What is the expression / value at ?5?

isc class xi practice test 3
Q 4 The following function trial() perform are a part of some class. Answer the following parts given below. Show dry run/working.

int trial(int n)

{

if(n==1)

return 2;

else if(n==2)

return 3;

return trial(n-2)+trial(n-1);

}

What will the function trial() return when the
value of n is 6.

Q 5. The following is
a part of some class. What will be the output of the function mymethod( )

when
the value of counter is equal to 3? Show the dry run/ working.

void
mymethod(int counter)

{

if(counter= =0) System.out.println(“ “);

else

{

System.out.println(“Hello
“+ counter);

mymethod(-
-counter);

System.out.println(“ “+ counter);

} }

Q 6.

The following
function Check() is a part of some class.
What will the function Check()

return when the
values of both 'm' and 'n' are equal to 5?
Show the dry run I working.

int Check (int
m, int n)

{

if (n = = 1)

return - m - -;

else

return + + m + Check (m, - -n)

}
isc class xi practice test 3

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