Explore topic-wise MCQs in Engineering.

This section includes 564 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

Which bitwise operator is suitable for turning on a particular bit in a number?

A. && operator
B. & operator
C. || operator
D. | operator
Answer» E.
Discussion
2.

In which numbering system can the binary number 1011011111000101 be easily converted to?

A. Decimal system
B. Hexadecimal system
C. Octal system
D. No need to convert
Answer» C. Octal system
Discussion
3.

Which bitwise operator is suitable for turning off a particular bit in a number?

A. && operator
B. & operator
C. || operator
D. ! operator
Answer» C. || operator
Discussion
4.

Which bitwise operator is suitable for checking whether a particular bit is on or off?

A. && operator
B. & operator
C. || operator
D. ! operator
Answer» C. || operator
Discussion
5.

What is the purpose of "rb" in fopen() function used below in the code? FILE *fp; fp = fopen("source.txt", "rb");

A. open "source.txt" in binary mode for reading
B. open "source.txt" in binary mode for reading and writing
C. Create a new file "source.txt" for reading and writing
D. None of above
Answer» B. open "source.txt" in binary mode for reading and writing
Discussion
6.

Out of fgets() and gets() which function is safe to use?

A. gets()
B. fgets()
Answer» C.
Discussion
7.

Consider the following program and what will be content of t? #include<stdio.h> int main() { FILE *fp; int t; fp = fopen("DUMMY.C", "w"); t = fileno(fp); printf("%d n", t); return 0; }

A. size of "DUMMY.C" file
B. The handle associated with "DUMMY.C" file
C. Garbage value
D. Error in fileno()
Answer» C. Garbage value
Discussion
8.

Which of the following function is more appropriate for reading in a multi-word string?

A. printf();
B. scanf();
C. gets();
D. puts();
Answer» D. puts();
Discussion
9.

The operator used to get value at address stored in a pointer variable is

A. *
B. &
C. &&
D. ||
Answer» B. &
Discussion
10.

What would be the equivalent pointer expression for referring the array element a[i][j][k][l]

A. ((((a+i)+j)+k)+l)
B. *(*(*(*(a+i)+j)+k)+l)
C. (((a+i)+j)+k+l)
D. ((a+i)+j+k+l)
Answer» C. (((a+i)+j)+k+l)
Discussion
11.

Which of the following function is correct that finds the length of a string?

A. <pre><code class="cpp">int xstrlen(char *s) { int length=0; while(*s!=' 0') { length++; s++; } return (length); } </code></pre>
B. <pre><code class="cpp">int xstrlen(char s) { int length=0; while(*s!=' 0') length++; s++; return (length); } </code></pre>
C. <pre><code class="cpp">int xstrlen(char *s) { int length=0; while(*s!=' 0') length++; return (length); } </code></pre>
D. <pre><code class="cpp">int xstrlen(char *s) { int length=0; while(*s!=' 0') s++; return (length); } </code></pre>
Answer» B. <pre><code class="cpp">int xstrlen(char s) { int length=0; while(*s!=' 0') length++; s++; return (length); } </code></pre>
Discussion
12.

If the two strings are identical, then strcmp() function returns

A. -1
B. 1
C. 0
D. Yes
Answer» D. Yes
Discussion
13.

What will be the output of the program? #include&lt;stdio.h&gt; int main() { const char *s = ""; char str[] = "Hello"; s = str; while(*s) printf("%c", *s++); return 0; }

A. Error
B. H
C. Hello
D. Hel
Answer» D. Hel
Discussion
14.

Which of the following operations can be performed on the file "NOTES.TXT" using the below code? FILE *fp; fp = fopen("NOTES.TXT", "r+");

A. Reading
B. Writing
C. Appending
D. Read and Write
Answer» E.
Discussion
15.

To print out a and b given below, which of the following printf() statement will you use? #include&lt;stdio.h&gt; float a=3.14; double b=3.14;

A. printf("%f %lf", a, b);
B. printf("%Lf %f", a, b);
C. printf("%Lf %Lf", a, b);
D. printf("%f %Lf", a, b);
Answer» B. printf("%Lf %f", a, b);
Discussion
16.

How will you print n on the screen?

A. printf(" n");
B. echo " n";
C. printf(' n');
D. printf(" n");
Answer» E.
Discussion
17.

Which of the following function is used to find the first occurrence of a given string in another string?

A. strchr()
B. strrchr()
C. strstr()
D. strnset()
Answer» D. strnset()
Discussion
18.

What is (void*)0?

A. Representation of NULL pointer
B. Representation of void pointer
C. Error
D. None of above
Answer» B. Representation of void pointer
Discussion
19.

Can you combine the following two statements into one? char *p; p = (char*) malloc(100);

A. char p = *malloc(100);
B. char *p = (char) malloc(100);
C. char *p = (char*)malloc(100);
D. char *p = (char *)(malloc*)(100);
Answer» D. char *p = (char *)(malloc*)(100);
Discussion
20.

In which header file is the NULL macro defined?

A. stdio.h
B. stddef.h
C. stdio.h and stddef.h
D. math.h
Answer» D. math.h
Discussion
21.

If a variable is a pointer to a structure, then which of the following operator is used to access data members of the structure through the pointer variable?

A. .
B. &amp
C. *
D. ->
Answer» E.
Discussion
22.

What will be the output of the program? #include&lt;stdio.h&gt; int main() { int y=128; const int x=y; printf("%d n", x); return 0; }

A. 128
B. Garbage value
C. Error
D. 0
Answer» B. Garbage value
Discussion
23.

Which of the following statements should be used to obtain a remainder after dividing 3.14 by 2.1 ?

A. rem = 3.14 % 2.1;
B. rem = modf(3.14, 2.1);
C. rem = fmod(3.14, 2.1);
D. Remainder cannot be obtain in floating point division.
Answer» D. Remainder cannot be obtain in floating point division.
Discussion
24.

What are the types of linkages?

A. Internal and External
B. External, Internal and None
C. External and None
D. Internal
Answer» C. External and None
Discussion
25.

What will be the output of the program in TurboC? #include&lt;stdio.h&gt; int fun(int **ptr); int main() { int i=10, j=20; const int *ptr = &amp;i; printf(" i = %5X", ptr); printf(" ptr = %d", *ptr); ptr = &amp;j; printf(" j = %5X", ptr); printf(" ptr = %d", *ptr); return 0; }

A. i= FFE2 ptr=12 j=FFE4 ptr=24
B. i= FFE4 ptr=10 j=FFE2 ptr=20
C. i= FFE0 ptr=20 j=FFE1 ptr=30
D. Garbage value
Answer» C. i= FFE0 ptr=20 j=FFE1 ptr=30
Discussion
26.

Which of the following is the correct order if calling functions in the below code? a = f1(23, 14) * f2(12/4) + f3();

A. f1, f2, f3
B. f3, f2, f1
C. Order may vary from compiler to compiler
D. None of above
Answer» D. None of above
Discussion
27.

Which of the following are unary operators in C? 1. ! 2. sizeof 3. ~ 4. &amp;&amp;

A. 1, 2
B. 1, 3
C. 2, 4
D. 1, 2, 3
Answer» E.
Discussion
28.

When we mention the prototype of a function?

A. Defining
B. Declaring
C. Prototyping
D. Calling
Answer» C. Prototyping
Discussion
29.

By default a real number is treated as a

A. float
B. double
C. long double
D. far double
Answer» C. long double
Discussion
30.

Which of the following is not user defined data type? 1 : struct book { char name[10]; float price; int pages; }; 2 : long int l = 2.35; 3 : enum day {Sun, Mon, Tue, Wed};

A. 1
B. 2
C. 3
D. Both 1 and 2
Answer» C. 3
Discussion
31.

Is the following statement a declaration or definition? extern int i;

A. Declaration
B. Definition
C. Function
D. Error
Answer» B. Definition
Discussion
32.

Identify which of the following are declarations 1 : extern int x; 2 : float square ( float x ) { ... } 3 : double pow(double, double);

A. 1
B. 2
C. 1 and 3
D. 3
Answer» D. 3
Discussion
33.

Which of the following special symbol allowed in a variable name?

A. * (asterisk)
B. | (pipeline)
C. - (hyphen)
D. _ (underscore)
Answer» E.
Discussion
34.

How would you round off a value from 1.66 to 2.0?

A. ceil(1.66)
B. floor(1.66)
C. roundup(1.66)
D. roundto(1.66)
Answer» B. floor(1.66)
Discussion
35.

Which of the following statement obtains the remainder on dividing 5.5 by 1.3 ?

A. rem = (5.5 % 1.3)
B. rem = modf(5.5, 1.3)
C. rem = fmod(5.5, 1.3)
D. Error: we can't divide
Answer» D. Error: we can't divide
Discussion
36.

What will you do to treat the constant 3.14 as a float?

A. use float(3.14f)
B. use 3.14f
C. use f(3.14)
D. use (f)(3.14)
Answer» C. use f(3.14)
Discussion
37.

We want to round off x, a float, to an int value, The correct way to do is

A. y = (int)(x + 0.5)
B. y = int(x + 0.5)
C. y = (int)x + 0.5
D. y = (int)((int)x + 0.5)
Answer» B. y = int(x + 0.5)
Discussion
38.

The binary equivalent of 5.375 is

A. 101.101110111
B. 101.011
C. 101011
D. None of above
Answer» C. 101011
Discussion
39.

Can you use the fprintf() to display the output on the screen?

A. Yes
B. No
Answer» B. No
Discussion
40.

What will the function randomize() do in Turbo C under DOS?

A. returns a random number.
B. returns a random number generator in the specified range.
C. returns a random number generator with a random value based on time.
D. return a random number with a given seed value.
Answer» D. return a random number with a given seed value.
Discussion
41.

What will the SWAP macro in the following program be expanded to on preprocessing? will the code compile? #include&lt;stdio.h&gt; #define SWAP(a, b, c)(c t; t=a, a=b, b=t) int main() { int x=10, y=20; SWAP(x, y, int); printf("%d %d n", x, y); return 0; }

A. It compiles
B. Compiles with an warning
C. Not compile
D. Compiles and print nothing
Answer» D. Compiles and print nothing
Discussion
42.

What will happen if in a C program you assign a value to an array element whose subscript exceeds the size of array?

A. The element will be set to 0.
B. The compiler would report an error.
C. The program may crash if some important data gets overwritten.
D. The array size would appropriately grow.
Answer» D. The array size would appropriately grow.
Discussion
43.

What are the different types of real data type in C ?

A. float, double
B. short int, double, long int
C. float, double, long double
D. double, long int, float
Answer» D. double, long int, float
Discussion
44.

What is the similarity between a structure, union and enumeration?

A. All of them let you define new values
B. All of them let you define new data types
C. All of them let you define new pointers
D. All of them let you define new structures
Answer» C. All of them let you define new pointers
Discussion
45.

In which stage the following code #include&lt;stdio.h&gt; gets replaced by the contents of the file stdio.h

A. During editing
B. During linking
C. During execution
D. During preprocessing
Answer» E.
Discussion
46.

In C, if you pass an array as an argument to a function, what actually gets passed?

A. Value of elements in array
B. First element of the array
C. Base address of the array
D. Address of the last element of array
Answer» D. Address of the last element of array
Discussion
47.

What will be the output of the program? #include&lt;stdio.h&gt; #include&lt;stdarg.h&gt; void fun(char *msg, ...); int main() { fun("IndiaBIX", 1, 4, 7, 11, 0); return 0; } void fun(char *msg, ...) { va_list ptr; int num; va_start(ptr, msg); num = va_arg(ptr, int); num = va_arg(ptr, int); printf("%d", num); }

A. IndiaBIX 1 7 11 0
B. 1
C. 4
D. 7
Answer» D. 7
Discussion
48.

Which of the following is not logical operator?

A. &
B. &&
C. ||
D. !
Answer» B. &&
Discussion
49.

In mathematics and computer programming, which is the correct order of mathematical operators ?

A. Addition, Subtraction, Multiplication, Division
B. Division, Multiplication, Addition, Subtraction
C. Multiplication, Addition, Division, Subtraction
D. Addition, Division, Modulus, Subtraction
Answer» C. Multiplication, Addition, Division, Subtraction
Discussion
50.

What will the function rewind() do?

A. Reposition the file pointer to a character reverse.
B. Reposition the file pointer stream to end of file.
C. Reposition the file pointer to begining of that line.
D. Reposition the file pointer to begining of file.
Answer» E.
Discussion