MCQs Class 12th ISC Computer Application with Answers

 12th Computer Application MCQS with Answers Available Here.

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1) What will be printed as the output of the following program?

public class testincr
{
public static void main(String args[])
{
int i = 0;
i = i++ + i;
System.out.println(“I = ” +i);
}
}

a.     I = 0

b.     I = 1

c.      I = 2

d.     I = 3

e.     Compile-time Error.

 

2) What is the output of the following program:

public class testmeth
{
static int i = 1;
public static void main(String args[])
{
System.out.println(i+” , “);
m(i);
System.out.println(i);
}
public void m(int i)
{
i += 2;
}
}

a.     1 , 3

b.     3 , 1

c.     1 , 1

d.     1 , 0

e.     none of the above.

 

3) What is the type and value of the following expression? (Notice the integer division)

-4 + 1/2 + 2*-3 + 5.0

a.     int -5

b.     double -4.5

c.      int -4

d.      double -5.0

e.     None of the above

 

4) What is printed by the following statement?
System.out.print(“Hello,\nworld!”);

a.     Hello, \nworld!

b.     Hello, world!

c.     Hello,

world!

d.     “Hello, \nworld!”

e.      None of the above.c

 

5) Which of the following variable declaration would NOT compile in a java program?

(a) int var;

 (b) int VAR;

(c) int var1;

(d) int var_1;

(e) int 1_var;.

 

6) You read the following statement in a Java program that compiles and executes.
submarine.dive(depth);

What can you say for sure?

(a) depth must be an int
(b) dive must be a method.
(c) dive must be the name of an instance field.
(d) submarine must be the name of a class
(e) submarine must be a method.

7) What is the output of the following code:

class eq
{
public static void main(String args[])
{
String s1 = “Hello”;
String s2 = new String(s1);
System.out.println(s1==s2);
}
}

(a) true

 (b) false

(c) 0

 (d) 1

(e) Hello.

 

8) Identify, from among the following, the incorrect variable name(s).

(a) _theButton

(b) $reallyBigNumber
(c) 2ndName

 (d) CurrentWeatherStateofplanet
(e) my2ndFont.

 

9) Use the following declaration and initialization to evaluate the Java expressions

int a = 2, b = 3, c = 4, d = 5;
float k = 4.3f;

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

(a) 21

 (b) 24

 (c) 28

 (d) 26

 (e) 22.

 

10) Consider the following Java program :

class IfStatement{
public static void main(String args[])
{
int a=2, b=3;
if (a==3)
if (b==3)
System.out.println(“===============”);
else
System.out.println(“#################”);
System.out.println(“&&&&&&&&&&&”);
}
}

Which of the following will the output be?

(a) ===============
(b) #################
&&&&&&&&&
(c) &&&&&&&&&&&
(d) ===============
#################
&&&&&&&&&&
(e) ################.

11) Java compiler javac translates Java source code into ………………………

(a) Assembler language

 (b) Byte code
(c) Bit code

(d) Machine code
(e) Platform dependent code.

 

12) ……………….. are used to document a program and improve its readability.

(a) System cells

 (b) Keywords

 (c) Comments

 (d) Control structures

 (e) Blocks.

 

 

 

13) Identify, from among the following, the incorrect descriptions related to Java :

(a) Java Virtual Machine translates byte code into its own system’s machine language and runs the resulting machine code
(b) The arithmetic operations *, /, %, + and – have the same level of precedence
(c) Comments do not cause any action to be performed during the program execution
(d) All variables must be given a type when they are declared
(e) Java variable names are case-sensitive.

 

14) Consider the following statement(s) about Java:

I. All white-space characters (blanks) are ignored by the compiler.
II. Java keywords can be used as variable names.
III. An identifier does not begin with a digit and does not contain any spaces.
IV. The execution of Java applications begins at method main.

Which of them is correct?

(a) Both (I) and (III) above

 (b) Both (II) and (IV) above
(c) Both (I) and (II) above

(d) (III) and (IV) above
(e) All (I), (II), (III) and (IV) above.

 

15) For what values respectively of the variables gender and age would the Java expression gender == 1 && age >= 65 become true?

(a) gender = 1, age = 60

 (b) gender = 1, age = 50
(c) gender = 1, age = 65

 (d) gender = 0, age = 70
(e) gender = 0, age = 55.

 

 

16) Consider the following Java program :

public class Compute {

public static void main (string args [ ])
{
int result, x ;
x = 1 ;
result = 0;
while (x < = 10) {
if (x%2 == 0) result + = x ;
+ + x ;
}
System.out.println(result) ;
}
}

Which of the following will be the output of the above program?

(a) 55

 (b) 30

 (c) 25

(d) 35

(e) 45.

 

17)(A.B)’=A’+B’  Is a …………………..

 

a.     Demorgon’s Law.

b.     Distributive law

c.     Involution law

d.     Adsorption law

 

18)If the final result of the Truth Table of a proposition come all 1’s then it is termed as……………

a.     Tautology

b.     Contingency

c.     Contradiction

d.     Invaild

 

19)if((a!=b)&&(a == c)) then which of the following statement is true:

1. b is the smallest number
2. b is the greatest number
3. a is the smallest number
4. none

20)A Java program executes but does not give the desired output. It is due to the

1. logical error in the program
2. syntax error in the program
3. grammatical error
4. none

21)State the final value of q at the end of the following program segment after execution. Show the dry run.

for(m=2;m<=3;++m)

{

for(n=1;n<=m;++n)

{

p=m+n-1;

if(p%3 == 0)

q += p;

else

q += p+4;

}

}

a.     27

b.     25

c.     29

d.     30

e.     28

 Answers:

1)     b
2)     c
3)     d
4)     c
5)     e
6)     b
7)     b
8)     c
9)     b
10)  c
11)  b
12)  c
13)  b
14)  III and IV(d)
15)  C
16)  B
17)  A
18)  A
19)  4
20)  1
21)  C