computer MCQs - 12th class Chapter 11 Mcqs

1

Which of the following is NOT a basic control structure mentioned in the text?

A

Sequence

B

Selection

C

Repetition

D

Declaration

2

A group of statements enclosed in opening and closing braces is called a __________.

A

Compound statement

B

Simple statement

C

Control structure

D

Function

3

In a simple 'if' statement, when is the block of statements executed?

A

When the condition is false

B

Always

C

When the condition is true

D

Never

4

What is the value of a 'true' condition usually represented by in C?

A

0

B

1

C

-1

D

Any non-zero value

5

What happens if you omit the braces for a single statement in an 'if' block?

A

It is a syntax error

B

It is a logical error

C

It is optional and works correctly

D

It causes a runtime error

6

The 'if-else' statement is used to specify how many different choices?

A

One

B

Two

C

Three

D

Multiple

7

What error occurs if you have an 'else' without a matching 'if'?

A

Undeclared identifier

B

Type mismatch

C

Illegal else without matching if

D

Syntax error

8

A nested 'if' statement refers to what?

A

An 'if' statement inside a loop

B

An 'if' statement inside another 'if' statement

C

Multiple 'if' statements in a sequence

D

An 'if' statement with a compound condition

9

According to the text, what is a primary drawback of increasing the level of nesting in 'if' statements?

A

It reduces program speed

B

It uses more memory

C

It increases the complexity

D

It is not allowed by the compiler

10

In a sequence of 'if' statements, how many conditions are tested?

A

Only the first one

B

Only until a true condition is found

C

All conditions are tested

D

Only the last one

11

Which statement is described as a good option for more than three alternatives to avoid the complexity of nested ifs?

A

switch

B

if-else if

C

goto

D

simple if

12

In an 'if-else if' statement, what happens if all conditions are false?

A

The program terminates

B

The first block of statements is executed

C

The statement following the final 'else' is executed

D

No statement is executed

13

Which logical operator is represented by '&&' in C?

A

OR

B

NOT

C

XOR

D

AND

14

The 'switch' statement compares the value of an expression against a list of __________.

A

variables

B

functions

C

cases

D

loops

15

The value of the expression in a 'switch' statement must NOT be of which type?

A

int

B

char

C

long

D

double

16

What is the purpose of the 'break' statement within a 'switch' structure?

A

To end the program

B

To skip the rest of the switch statement

C

To return a value

D

To repeat the case

17

What happens if 'break' statements are omitted from a 'switch' block?

A

Only the first true case executes

B

It's a syntax error

C

Code from the first true case to the end of the switch executes

D

No case will execute

18

Which label in a 'switch' statement is executed if none of the case labels match?

A

default

B

else

C

otherwise

D

none

19

The conditional operator (?:) is what type of operator?

A

Unary

B

Binary

C

Ternary

D

Logical

20

In the expression 'condition ? true_case : false_case', what happens if the condition is false?

A

The true_case statement is executed

B

The false_case statement is executed

C

Both are executed

D

The program exits

21

Control structures are used to control the __________ of execution in a program.

A

speed

B

flow

C

memory

D

data type

22

Which control structure is also called the default flow?

A

Selection

B

Repetition

C

Sequence

D

Function Call

23

According to the text, which of the following is a selection statement in C?

A

for

B

while

C

switch

D

do-while

24

What will be the value of 'status' if the expression is 'status = (age > 60);' and age is 45?

A

1

B

0

C

45

D

60

25

Omitting braces in an 'if' block with multiple statements will cause what?

A

Only the first statement to be part of the 'if' block

B

A compilation error

C

The entire block to be part of 'if'

D

The program to crash

26

In an 'if-else if' ladder, when does the execution of the structure terminate?

A

After checking all conditions

B

When a true condition is found and its block is executed

C

When a false condition is found

D

Only after the final 'else' block

27

Using logical operators can often __________ the program logic.

A

complicate

B

slow down

C

simplify

D

erase

28

The case label in a switch statement can be which of these constant types?

A

float

B

string

C

integral

D

double

29

In the case study, if both x- and y-coordinates are zero, the point lies at the __________.

A

x-axis

B

y-axis

C

origin

D

1st quadrant

30

If x-coordinate is negative (<0) and y-coordinate is positive (>0), the point lies in which quadrant?

A

1st

B

2nd

C

3rd

D

4th

31

What is a pictorial representation of a program called?

A

Algorithm

B

Pseudocode

C

Flow chart

D

Syntax diagram

32

What is the purpose of the 'default' label in a 'switch' statement?

A

It is mandatory for all switch statements

B

It provides code to be executed if no case matches

C

It marks the beginning of the switch statement

D

It is used to declare variables

33

Which header file includes the definition for the sqrt() function?

A

<stdio.h>

B

<string.h>

C

<conio.h>

D

<math.h>

34

The expression in an 'if' statement is known as a __________.

A

loop

B

condition

C

variable

D

function

35

If a condition is false, it is represented by the value __________.

A

1

B

0

C

true

D

-1

36

The statement 'if (a > b && a > c)' contains what kind of condition?

A

Simple

B

Compound

C

Relational

D

Arithmetic

37

What does a compound statement in C refer to?

A

A statement with a logical operator

B

A group of statements enclosed in braces

C

A statement that declares multiple variables

D

An assignment statement

38

Which of the a following is a repetition structure?

A

if-else

B

switch

C

for loop

D

conditional operator

39

In the vowel/consonant checking example, why are two case labels used together (e.g., case 'a': case 'A':)?

A

It is a syntax error

B

It acts like a logical OR

C

It acts like a logical AND

D

It is required for characters

40

If you have a sequence of 'if' statements, this can be inefficient because __________.

A

it is hard to read

B

it always tests all conditions

C

it uses too much memory

D

it can cause syntax errors

41

The 'if-else if' statement is also known as a statement with __________ alternatives.

A

one

B

two

C

no

D

multiple

42

What will be printed if the code is 'a > b ? printf("A") : printf("B");' and a=5, b=10?

A

B

C

AB

D

Nothing

43

A solution that is a step-by-step procedure to solve a problem is an __________.

A

flowchart

B

algorithm

C

compiler

D

interpreter

44

If y-coordinate is zero and x-coordinate is non-zero, the point lies on the __________.

A

y-axis

B

origin

C

x-axis

D

4th quadrant

45

What error does the compiler generate if a float is used in a switch expression?

A

Type Mismatch

B

Switch selection expression must be of integral type

C

Illegal use of float

D

Undefined symbol

46

The process of placing an 'if' statement inside another is called __________.

A

looping

B

recursion

C

sequencing

D

nesting

47

In the expression '(num > 0)', 'num' is a variable and '>' is a __________ operator.

A

logical

B

arithmetic

C

relational

D

assignment

48

When are braces mandatory for the body of an 'if' or 'else' statement?

A

Always

B

Never

C

When the body contains a single statement

D

When the body contains multiple statements

49

What is the final 'else' in an 'if-else if' chain used for?

A

To catch all conditions that were false

B

To start the chain

C

It is mandatory

D

To handle syntax errors

50

Using logical AND (&&) to rewrite 'if (a > b) { if (a > c) }' simplifies it to __________.

A

if (a > b || a > c)

B

if (a > b && a > c)

C

if (a > b, a > c)

D

if (a && b > c)