1 $Which of the following is NOT a valid variable name definition in C?$

A.

int _a3;

B.

int 3a;

C.

int a_3;

D.

int a3;

2 $Which standard library header is typically included to use the printf and scanf functions?$

A.

<conio.h>

B.

<stdlib.h>

C.

<stdio.h>

D.

<math.h>

3 $What is the result of the expression in C when both operands are integers?$

A.

$2.5$

B.

$2.0$

C.

$2$

D.

$3$

4 $Which of the following is a valid keyword in C?$

A.

integer

B.

volatile

C.

main

D.

constant

5 $What is the size of a char data type in C?$

A.

2 bytes

B.

1 byte

C.

4 bytes

D.

8 bytes

6 $Which operator is used to calculate the remainder of an integer division?$

A.

B.

C.

D.

7 $What is the correct format specifier for a double-precision floating-point variable?$

A.

%d

B.

%f

C.

%lf

D.

%c

8 $Which of the following represents a hexadecimal constant in C?$

A.

012

B.

0x12

C.

12h

D.

12x

9 $Identify the ternary (conditional) operator.$

A.

if-else

B.

?:

C.

||

D.

==

10 $What is the result of the bitwise AND operation: ?$

A.

$0$

B.

$1$

C.

$7$

D.

$5$

11 $Which of the following is an invalid string constant?$

A.

"Hello"

B.

"123"

C.

'Hello'

D.

""

12 $What is the associativity of the assignment operator (=)?$

A.

Left to Right

B.

Right to Left

C.

Random

D.

Center Out

13 $Which of the following is a Relational Operator?$

A.

&&

B.

=

C.

>=

D.

<<

14 $What happens if you assign a float value $3.14$ to an int variable?$

A.

The compiler throws an error.

B.

The value is rounded to the nearest integer ($3$).

C.

The value is truncated to the integer part ($3$).

D.

The value becomes garbage.

15 $Which operator has the highest precedence?$

A.

(Addition)

B.

(Assignment)

C.

(Equality)

D.

(Multiplication)

16 $What is the value of x after the following code executes? int x = 5; x += 10;$

A.

$5$

B.

$10$

C.

$15$

D.

$510$

17 $The logical NOT operator is represented by:$

A.

~

B.

!

C.

!=

D.

^

18 $Which escape sequence represents a newline?$

A.

\t

B.

\n

C.

\r

D.

\a

19 $Which data type would be best suited to store the value True or False in C99?$

A.

int

B.

char

C.

_Bool

D.

float

20 $What is the output of sizeof(double) on a standard 32-bit or 64-bit system?$

A.

2

B.

4

C.

8

D.

10

21 $Which of the following creates an octal constant?$

A.

Prefixing with o

B.

Prefixing with 0 (zero)

C.

Suffixing with 8

D.

Prefixing with #

22 $Evaluate: 10 && 0$

A.

$10$

B.

$0$ (False)

C.

$1$ (True)

D.

Error

23 $What does the increment operator ++ do?$

A.

Adds 2 to the variable

B.

Adds 1 to the variable

C.

Doubles the variable

D.

Returns the address of the variable

24 $Consider int a = 10; int b = a++; . What are the values of a and b ?$

A.

B.

C.

D.

25 $Which operator is used to perform a Left Shift?$

A.

>>

B.

<<

C.

<

D.

<<<

26 $What is the range of a signed char ?$

A.

$0$ to $255$

B.

to $127$

C.

to $32767$

D.

$0$ to $65535$

27 $Which of the following is NOT a C unary operator?$

A.

++

B.

sizeof

C.

& (Address of)

D.

%

28 $The expression a = (b = 5, b + 2) results in a having the value:$

A.

$5$

B.

$7$

C.

$2$

D.

Syntax Error

29 $What is the result of 1 ^ 1 in C?$

A.

$0$

B.

$1$

C.

$2$

D.

$11$

30 $How are comments written in C (single line)?$

A.

# comment

B.

<!-- comment -->

C.

// comment

D.

/* comment

31 $Which header file is required to use INT_MAX ?$

A.

<stdio.h>

B.

<limits.h>

C.

<conio.h>

D.

<stdlib.h>

32 $In the expression if (a > b && c > d), if a > b is false, what happens?$

A.

c > d is evaluated next.

B.

c > d is NOT evaluated.

C.

The program crashes.

D.

The compiler generates an error.

33 $The sizeof operator returns the size in:$

A.

Bits

B.

Bytes

C.

Words

D.

Kilobytes

34 $What is the decimal equivalent of the bitwise left shift 3 << 2 ?$

A.

$6$

B.

$12$

C.

$9$

D.

$32$

35 $Which of these identifiers follows the 'CamelCase' convention (often used, though snake_case is common in C)?$

A.

student_grade

B.

StudentGrade

C.

studentgrade

D.

STUDENT_GRADE

36 $Which operator performs a one's complement (inverts all bits)?$

A.

!

B.

-

C.

~

D.

^

37 $What is the correct syntax to declare a constant variable PI with value $3.14$?$

A.

constant float PI = 3.14;

B.

const float PI = 3.14;

C.

float const = 3.14 PI;

D.

var const PI = 3.14;

38 $What is the value of x ? int x = 4 + 2 * 3;$

A.

$18$

B.

$10$

C.

$9$

D.

$24$

39 $Which character represents the null terminator in a C string?$

A.

'0'

B.

'\0'

C.

'\n'

D.

NULL

40 $If x = 5, what is x += x + x ?$

A.

$10$

B.

$15$

C.

$25$

D.

$20$

41 $Which of these is a valid scientific notation constant in C?$

A.

2.3e-2

B.

2.3 x 10^-2

C.

2.3^-2

D.

e2.3

42 $The result of a relational operator (e.g., a < b) is always:$

A.

The smaller value

B.

The larger value

C.

$0$ or $1$

D.

true or false keyword

43 $What is the l-value in the statement a = 10; ?$

A.

10

B.

a

C.

=

D.

;

44 $Which variable declaration would allow storage of the largest integer value?$

A.

int

B.

unsigned int

C.

short

D.

unsigned long long

45 $Evaluate the condition:!5$

A.

$5$

B.

C.

$0$

D.

$1$

46 $What is the associativity of the Logical OR operator || ?$

A.

Right to Left

B.

Left to Right

C.

Top to Bottom

D.

None

47 $What is the output of printf("%d", 'A'); assuming ASCII encoding?$

A.

A

B.

65

C.

97

D.

Error

48 $Bitwise operators can operate on which type of variables?$

A.

float and double

B.

int and char

C.

void

D.

All data types

49 $Which of the following is NOT a C token?$

A.

Keyword

B.

Identifier

C.

Operator

D.

Comment

50 $What is the result of 10 % 3 ?$

A.

$3.33$

B.

$3$

C.

$1$

D.

$0$

Unit 1 - Practice Quiz