computer MCQs - 12th class Chapter 09 Mcqs

1

The names used to represent variables, constants, types, and functions are called?

A

Keywords

B

Identifiers

C

Data Types

D

Operators

2

According to the text, how many types of identifiers are there in C?

A

One

B

Two

C

Three

D

Four

3

Which of the following is given as an example of a standard identifier?

A

int

B

main

C

printf

D

void

4

The fact that 'SQUARE_AREA' and 'Square_Area' are considered different identifiers means C is?

A

Case insensitive

B

Strongly typed

C

A magic tool

D

Case sensitive

5

Words that have a predefined meaning in C and cannot be redefined are called?

A

Identifiers

B

Comments

C

Keywords

D

Variables

6

How many words are defined as keywords in ANSI C?

A

31

B

32

C

40

D

64

7

Variables are named memory locations created in?

A

ROM

B

Hard Disk

C

Cache

D

RAM

8

What is the process of assigning a value to a variable at the time of its declaration called?

A

Defining

B

Initializing

C

Declaring

D

Executing

9

A variable name can consist of letters, digits, and which other character?

A

Hyphen (-)

B

Ampersand (&)

C

Underscore (_)

D

Space ( )

10

What must be the first character of a variable name in C?

A

A digit

B

An underscore

C

A letter

D

Any character

11

For many compilers like Turbo C++, what is the maximum number of significant characters in a variable name?

A

8

B

16

C

31

D

64

12

Which of the in the following is an invalid variable name in C?

A

interest_rate

B

totalMarks

C

problem solving

D

MAX_SPEED

13

A quantity whose value cannot be changed during program execution is a?

A

Variable

B

Constant

C

Keyword

D

Operator

14

Which directive is used to define constant macros like #define PI 3.142857?

A

include

B

define

C

constant

D

macro

15

A single alphabet, digit, or symbol enclosed in apostrophes like 'A' is a?

A

String constant

B

Numeric constant

C

Float constant

D

Character constant

16

What is the maximum length of a character constant in C?

A

1 character

B

2 characters

C

4 characters

D

8 characters

17

'int', 'double', and 'char' are examples of what?

A

User-defined data types

B

Standard data types

C

Reserved words

D

Functions

18

How many bytes of memory does a standard 'int' variable typically occupy?

A

1

B

2

C

4

D

8

19

What is the range of values for a standard 'signed int' data type?

A

0 to 255

B

0 to 65535

C

-128 to 127

D

-32768 to 32767

20

What is the range of values for an 'unsigned int' data type?

A

0 to 65535

B

-32768 to 32767

C

0 to 255

D

-2147483648 to 2147483647

21

How many bytes of memory does a 'long' data type occupy?

A

1

B

2

C

4

D

8

22

In scientific notation like 2.45634e5, the value 2.45634 is the?

A

Exponent

B

Base

C

Mantissa

D

Power

23

Which data type provides the highest precision according to the table in the text?

A

float

B

double

C

long int

D

long double

24

How many bytes of memory does a 'float' variable occupy?

A

2

B

4

C

8

D

10

25

What is the precision in digits for a 'double' data type?

A

6

B

10

C

15

D

19

26

The 'char' data type variable occupies how many bytes in memory?

A

1

B

2

C

4

D

Depends on character

27

In C, characters are stored and manipulated in the form of?

A

EBCDIC code

B

Binary code

C

Unicode

D

ASCII code

28

When the result of a computation is too large to be represented, the phenomenon is called?

A

Arithmetic underflow

B

Cancellation error

C

Arithmetic overflow

D

Syntax error

29

When a calculation result is too small to be represented accurately and is set to zero, it is called?

A

Arithmetic overflow

B

Arithmetic underflow

C

Round off error

D

Truncation

30

What is the symbol for the modulus operator in C?

A

*

B

/

C

%

D

mod

31

The operator '==' is what type of operator?

A

Assignment

B

Arithmetic

C

Relational

D

Logical

32

What does the expression 'a != b' check for?

A

a is not equal to b

B

a is less than b

C

a is greater than b

D

a equals b

33

Which operator is the logical AND?

A

|

B

&

C

||

D

&&

34

Which operator is used to reverse the result of a logical evaluation?

A

&&

B

||

C

!

D

!=

35

The '=' symbol in C represents which operator?

A

Equality

B

Relational

C

Assignment

D

Comparison

36

The '++' symbol is known as which operator?

A

Addition

B

Increment

C

Assignment

D

Compound

37

If j = 10; and the statement is i = ++j;, what will be the final value of i?

A

10

B

11

C

9

D

Undefined

38

If j = 10; and the statement is i = j++;, what will be the final value of i?

A

10

B

11

C

9

D

Undefined

39

Increment and decrement operators are what type of operators?

A

Binary

B

Ternary

C

Unary

D

Relational

40

The statement 'j -= 5;' is equivalent to which of the following?

A

j = 5 - j;

B

j = 5;

C

j = j - 5;

D

5 = j - 5;

41

Which of the following operators has the highest precedence according to the text?

A

&&

B

0

C

*

D

!

42

Which of the following operators has the lowest precedence?

A

0

B

||

C

&&

D

+

43

A combination of operators and operands is known as?

A

A function

B

A statement

C

An expression

D

A declaration

44

What is the result of the integer division 5 / 2 in C?

A

2.5

B

2

C

3

D

Error

45

What is the result of the expression 5 % 2 in C?

A

2.5

B

2

C

1

D

0

46

When a double value like 2.5 is assigned to an int variable, what happens to the fractional part?

A

It is rounded up

B

It is rounded down

C

It is truncated

D

It causes an error

47

How do you start a single-line comment in C?

A

/*

B

//

C

##

D

<!--

48

How must a multi-line comment be ended in C?

A

//

B

*/

C

/*

D

-->

49

Comments in a C program are?

A

Executed by the compiler

B

Ignored by the compiler

C

Converted to machine code

D

Used for calculation

50

The standard input/output library is represented as?

A

math.h

B

string.h

C

stdio.h

D

stdlib.h