Top 20 MCQ Questions On Control Flow Statements In Java

This set of MCQ questions on control flow statements in Java includes the collections of multiple-choice questions control flow statements that are used to control the flow of execution in a program. It includes MCQ questions from decision-making statements like if-else and switch statements, looping statements like for loop, while loop and do-while loop along with other statements like a break, continue, and label statements.

1. …………………….. statement provides an easy way to dispatch execution to different parts of your code based on the value of an expression.
A) if-else
B) switch
C) if
D) while

2. State whether the following statements about switch statements are correct.
i) Switch statement often provides a better alternative than a large series of if-else-if statements.
ii)The break statement is used inside the switch to terminate a statement sequence.
A) True, False
B) False, True
C) True, True
D) False, False

3. The conditional statement, ………………. can only test for equality, whereas ………………. can evaluate any type of Boolean expression.
A) if, switch
B) switch, if
C) while, if
D) if, while

4. What will be the output of the following code snippet?

int a=15;
int b=25;
if ((a<b) || (a=5)>15)
   system.out.println(a);
else
   system.out.println(b);

A) Error
B) 15
C) 25
D) No output

5. What will be the output of the following code?

int x, y;
x=15; y=20;
if (x>15)
   if(y>15)
       {
           system.ptintln("y is  "+y);
        }
   else
         system.out.ptintln("x is "+x);

A) Error
B) y is 20
C) x is 15
D) No output

6. In the while and do-while loops, a ………………… statement causes control to be transferred directly to the conditional expression that controls the loop.
A) break
B) pause
C) start
D) continue

7. State whether the following statements about switch statements are True or False.
i) No two case constants in the same switch can have identical values.
ii) A switch statement is usually more efficient than a set of nested ifs.
A) True, False
B) False, True
C) True, True
D) False, False

8. State whether the following statements about conditional statements are True or False.
i) The break statement is required in the default case of a switch selection structure.
ii) A variable declared inside the for loop control cannot be reference outside the loop.
A) True, False
B) False, True
C) True, True
D) False, False

9. Which of the following control expressions are valid for an if statement?
A) an integer expression
B) a Boolean expression
C) either A or B
D) Neither A or B

10. In the following code snippet, which lines of code contain error?

1. int j=0;
2. while (j<10){
3. j++;
4. if (j==5) continue loop;
5. system.out.ptintln("j is " +j);}

A) Line 2
B) Line 3
C) Line 4
D) Line 5

11. State output of the following code

int x=20;
int y=10;
if(x>y)
   {
       if (y>10)
       system.out.println("y is "+y);
   }
else
     system.out.println("x is  "+x);

A) Error
B) x is 20
C) y is 10
D) No output

12. By using …………………….., you can force immediate termination of the loop, bypassing the conditional expression and any remaining code in the body of the loop.
A) switch
B) break
C) continue
D) default

13. The ………………………. loop is especially useful when you process a menu selection.
A) while
B) do-while
C) for
D) switch

14. If you need to select among a large group of values, a switch statement will run much faster than the equivalent logic coded using ……………….. statement.
A) if
B) if-else
C) do-while
D) while

15. What will be the output of the following code?

int j=50;
while(true)
{
  if(j<10)
     break;
     j=j-10;
 }
system.out.ptintln("j is  "+j);

A) Error
B) j is 0
C) j is 50
D) No output

16. Here is a segment of a program

x=1;
y=1;
 if(n>0)
  x=x+1;
  y=y-1;

that will be the values of x and y if n=1.
A) x=1, y=1
B) x=0, y=2
C) x=2, y=1
D) x=2, y=0

17. The ………………. is an optional case when it will be executed if the value of the expression does not match with any of the case values.

A) switch
B) break
C) continue
D) default

18. The ……………………… statement at the end of each block signals the end of a particular case and causes an exit from the switch statement, transferring the control to the statement following the switch.
A) switch
B) break
C) continue
D) default

19. The ………………… statement tests the value of a given variable against a list of case values and when a match is found, a block of statements associated with that case is executed.
A) switch
B) break
C) continue
D) default

20. State whether the following statements for if statement are True or False.
i) When if statements are nested, the last else gets associated with the nearest if without an else.
ii) One if can have more than one else clause.
A) True, False
B) False, True
C) True, True
D) False, False

Answers
1. B) switch
2. C) True, True
3. B) switch, if
4. B) 15
5. C) x is 15
6. D) continue
7. C) True, True
8. B) False, True
9. B) a Boolean expression
10. A) Line 2
11. D) No output
12. B) break
13. B) do-while
14. B) if-else
15. B) j is 0
16. D) x=2, y=0
17. D) default
18. B) break
19. A) switch
20. C) True, True