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

A.

int _a3;

B.

int a3;

C.

int 3a;

D.

int a_3;

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

A.

<stdio.h>

B.

<stdlib.h>

C.

<math.h>

D.

<conio.h>

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

A.

$2.0$

B.

$2.5$

C.

$3$

D.

$2$

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

A.

constant

B.

volatile

C.

main

D.

integer

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

A.

1 byte

B.

4 bytes

C.

8 bytes

D.

2 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.

%c

B.

%d

C.

%f

D.

%lf

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

A.

0x12

B.

12h

C.

12x

D.

012

9 $Identify the ternary (conditional) operator.$

A.

==

B.

?:

C.

if-else

D.

||

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

A.

$5$

B.

$0$

C.

$1$

D.

$7$

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

A.

"123"

B.

""

C.

'Hello'

D.

"Hello"

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

A.

Left to Right

B.

Center Out

C.

Random

D.

Right to Left

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

B.

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

C.

The compiler throws an error.

D.

The value becomes garbage.

15 $Which operator has the highest precedence?$

A.

(Multiplication)

B.

(Addition)

C.

(Assignment)

D.

(Equality)

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

A.

$10$

B.

$15$

C.

$510$

D.

$5$

17 $The logical NOT operator is represented by:$

A.

!=

B.

^

C.

~

D.

!

18 $Which escape sequence represents a newline?$

A.

\t

B.

\a

C.

\r

D.

\n

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

A.

char

B.

int

C.

_Bool

D.

float

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

A.

4

B.

10

C.

2

D.

8

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

A.

Prefixing with o

B.

Prefixing with #

C.

Suffixing with 8

D.

Prefixing with 0 (zero)

22 $Evaluate: 10 && 0$

A.

$1$ (True)

B.

$10$

C.

Error

D.

$0$ (False)

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

A.

Adds 1 to the variable

B.

Adds 2 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.

to $32767$

B.

$0$ to $255$

C.

to $127$

D.

$0$ to $65535$

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

A.

sizeof

B.

%

C.

& (Address of)

D.

++

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

A.

$5$

B.

Syntax Error

C.

$7$

D.

$2$

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

A.

$11$

B.

$0$

C.

$1$

D.

$2$

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.

<limits.h>

B.

<stdio.h>

C.

<conio.h>

D.

<stdlib.h>

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

A.

The compiler generates an error.

B.

c > d is NOT evaluated.

C.

The program crashes.

D.

c > d is evaluated next.

33 $The sizeof operator returns the size in:$

A.

Bytes

B.

Words

C.

Bits

D.

Kilobytes

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

A.

$32$

B.

$6$

C.

$9$

D.

$12$

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

A.

student_grade

B.

StudentGrade

C.

STUDENT_GRADE

D.

studentgrade

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.

var const PI = 3.14;

C.

float const = 3.14 PI;

D.

const float PI = 3.14;

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

A.

$24$

B.

$10$

C.

$9$

D.

$18$

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

A.

NULL

B.

'0'

C.

'\0'

D.

'\n'

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

A.

$10$

B.

$25$

C.

$15$

D.

$20$

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

A.

2.3 x 10^-2

B.

2.3^-2

C.

2.3e-2

D.

e2.3

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

A.

true or false keyword

B.

The smaller value

C.

The larger value

D.

$0$ or $1$

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

A.

a

B.

10

C.

;

D.

=

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

A.

short

B.

int

C.

unsigned int

D.

unsigned long long

45 $Evaluate the condition:!5$

A.

B.

$0$

C.

$1$

D.

$5$

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

A.

Left to Right

B.

Right to Left

C.

None

D.

Top to Bottom

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

A.

65

B.

97

C.

A

D.

Error

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

A.

int and char

B.

float and double

C.

All data types

D.

void

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

A.

Identifier

B.

Comment

C.

Operator

D.

Keyword

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

A.

$3$

B.

$3.33$

C.

$0$

D.

$1$

Unit 1 - Practice Quiz