computer MCQs - 12th class Chapter 10 Mcqs

1

Which function is used for formatted output in C?

A

scanf()

B

printf()

C

getch()

D

main()

2

What header file is required for standard input/output functions like printf() and scanf()?

A

conio.h

B

math.h

C

stdio.h

D

string.h

3

In C, what is generally considered the standard input device?

A

Monitor

B

Mouse

C

Printer

D

Keyboard

4

What does the format specifier %d represent?

A

float

B

char

C

double

D

int

5

What symbol must every format specifier begin with?

A

&

B

#

C

%

D

/

6

Which function is used to accept user input in various forms?

A

printf()

B

getche()

C

puts()

D

scanf()

7

What is the format specifier for a floating-point number?

A

%d

B

%c

C

%f

D

%s

8

What does the function signature describe?

A

The function's name only

B

The number and type of arguments, and the return type

C

The library it belongs to

D

The line number where it is defined

9

The list of variables in a printf() function is considered what?

A

Mandatory

B

Required

C

Essential

D

Optional

10

Which format specifier is used for a double data type?

A

%f

B

%lf

C

%c

D

%d

11

What is the term for the number of columns used to display a value on the screen?

A

Character width

B

Pixel count

C

Field-width

D

String length

12

Which format specifier is used for a single character?

A

%s

B

%d

C

%c

D

%f

13

How would you specify that an integer should be displayed using 5 columns?

A

%5d

B

%d5

C

5%d

D

%d.5

14

Values displayed with a field-width specifier in printf are typically justified in what way?

A

Left justified

B

Center justified

C

Right justified

D

Not justified

15

What is the general form for a floating-point format specifier with field width and precision?

A

%n.mf

B

%m.nf

C

%f.mn

D

%mf.nf

16

In the format specifier %6.2f, what does the '6' represent?

A

The number of decimal places

B

The number of variables

C

The total field width

D

The value to be printed

17

What symbol must every escape sequence begin with?

A

%

B

&

C

/

D

\

18

Which escape sequence represents a new line?

A

\t

B

\n

C

\r

D

\b

19

Which escape sequence is used to insert a tab space?

A

\t

B

\n

C

\a

D

\f

20

To use functions like getch() and getche(), which header file must be included?

A

stdio.h

B

stdlib.h

C

conio.h

D

math.h

21

What operator is required before the variable name in a scanf() function to store the input value?

A

*

B

&

C

$

D

#

22

Which function reads a character from the keyboard and echoes it to the screen?

A

getch()

B

getchar()

C

getche()

D

scanf()

23

Which function reads a character from the keyboard but does NOT echo it to the screen?

A

getche()

B

getch()

C

printf()

D

cin()

24

In C, how are character constants, like 'a' or '7', always specified?

A

Double quotes

B

Parentheses

C

Angle brackets

D

Single quotes

25

What happens if the ampersand (&) is omitted from a variable in a scanf() call?

A

The program crashes

B

A syntax error occurs

C

A garbage value is stored in the variable

D

The input is ignored

26

Which format specifier is used for a character string?

A

%c

B

%d

C

%s

D

%f

27

The escape sequence \r represents what action?

A

Backspace

B

Form Feed

C

Carriage Return

D

New Line

28

The escape sequence \b is used for what purpose?

A

Bell

B

Backspace

C

New Line

D

Tab

29

How do you print a literal backslash character using an escape sequence?

A

//

B

\/

C

\\

D

|

30

The format specifier %u is used for which data type?

A

unsigned float

B

unsigned char

C

unsigned short, unsigned int

D

unsigned long int

31

The format specifier %x is used for displaying what type of integers?

A

Octal

B

Decimal

C

Binary

D

Unsigned hexadecimal

32

The format specifier %o is used for which type of integers?

A

Unsigned octal

B

Signed octal

C

Hexadecimal

D

Long integer

33

In the exercise, what is the purpose of the getche() function?

A

It is defined in stdio.h

B

It is defined in string.h

C

It is defined in conio.h

D

It is defined in math.h

34

According to the exercise, the escape sequence for backslash is:

A

\

B

b\

C

\\

D

\t

35

The assignment operator in C is represented by which symbol?

A

0

B

0

C

:=

D

:

36

What does the C statement 'a += b;' mean?

A

a = b

B

b = a + b

C

a = a + b

D

a = b + 1

37

The format string of scanf() should consist only of what?

A

Text and format specifiers

B

Variables

C

Format specifiers only

D

Escape sequences

38

Do the getch() and getche() functions accept any arguments?

A

Yes, one integer

B

Yes, one character

C

No, they do not accept any arguments

D

Yes, a string

39

What is the return value of getch() and getche() functions?

A

The ASCII value of the key pressed

B

The character typed

C

An integer status code

D

Nothing (void)

40

When does the getche() function return the typed character?

A

After the Enter key is pressed

B

Immediately after a character is typed

C

After a space is typed

D

After 1 second

41

What does the escape sequence \f do?

A

Causes a backspace

B

Moves to the next page on a printer

C

Inserts a single quote

D

Represents a floating point number

42

The expression '\ddd' is used to print an ASCII code in which notation?

A

Hexadecimal

B

Binary

C

Decimal

D

Octal

43

In the format specifier %m.nf, what does 'n' represent?

A

Total width

B

Number of integer digits

C

Number of decimal places

D

A negative number

44

If a floating point value is being rounded, what happens if the third digit of the fractional part is 5 or greater?

A

The second digit is decreased by one

B

The second digit is increased by one

C

The third digit is kept

D

The entire number is rounded down

45

According to the text, what is the main purpose of using input and output functions?

A

To make the code shorter

B

To make the program more interactive

C

To perform complex calculations

D

To manage memory

46

What is the format specifier for a long integer?

A

%d

B

%f

C

%lf

D

%ld

47

Which of the following is an example of a character constant?

A

A""

B

A

C

(A)

D

[A]

48

The `scanf` function is pronounced as:

A

scan-ef

B

s-can-f

C

scan-eff

D

scanf

49

The `printf` function is pronounced as:

A

print-ef

B

p-rint-f

C

print-eff

D

printf