Explore topic-wise MCQs in Testing Subject.

This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.

1.

What will be the n in the following C code?#include <stdio.h> void main() { int n; }

A. static variable
B. global variable
C. automatic variable
D. register variable
E. None of these
Answer» D. register variable
Discussion
2.

What will be the output of the following C code? #include <stdio.h> int main() { register int n = 110; int *ptr = &n; *ptr = 111; printf("%d %d n", n, *ptr); }

A. 110 111
B. 111 110
C. 111
D. 110
E. Compilation Error
Answer» F.
Discussion
3.

What will be the output of the following C code?#include <stdio.h> void main() { register int P = 50; function(); printf("P is %d", P); } void function() { P++; }

A. 51
B. Garbage value
C. Compilation Error
D. 50
E. None of these
Answer» D. 50
Discussion
4.

What will be the output of the following C code?#include <stdio.h> double p; int main() { printf("%g n",p); return 0; }

A. 0.000000
B. Garbage value
C. Depend on compiler
D. 0
E. None of these
Answer» E. None of these
Discussion
5.

What will be the output of the following C code?#include <stdio.h> double n = 10; int main() { int n = 6; printf("%d", n); }

A. Compilation Error
B. Runtime Error
C. 6
D. 10
E. None of these
Answer» D. 10
Discussion
6.

What will be the output of the following C code? #include <stdio.h> int main() { printf("%d", num++); } int num = 15;

A. 15
B. Garbage value
C. Runtime Error
D. Compilation Error
E. None of these
Answer» E. None of these
Discussion
7.

What will be the output of the following C code?#include <stdio.h> int *p; int main() { if (p == 0) printf("Hey n"); return 0; }

A. Hey
B. Compilation Error
C. Hey only if NULL value is 0
D. Nothing
E. None of these
Answer» D. Nothing
Discussion
8.

What will be the output of the following C code?#include <stdio.h> int *ptr; int main() { if (ptr == NULL) printf("Right n"); return 0; }

A. Right only if NULL value is 0
B. Compilation Error
C. Nothing
D. Right
E. None of these
Answer» E. None of these
Discussion
9.

Can variable p be accessed by functions in another source file?#include <stdio.h> int p; int main() { printf("%d n", p); }

A. No
B. Yes
C. Depends on the type of the variable
D. Only if static keyword is used
E. None of these
Answer» C. Depends on the type of the variable
Discussion
10.

What will be the output of the following C code? #include <stdio.h> static int var = 15; void main() { var = 19; { int var = 14; } printf("%d", var); }

A. 15
B. 14
C. 19
D. Compilation Error
E. None of these
Answer» D. Compilation Error
Discussion
11.

What will be the output of the following C code?#include <stdio.h> int main() { int p = 200; int p = 17; printf("Hello Interview Mania! %d n", p); return 0; }

A. Interview Mania
B. Hello Interview Mania!
C. Compilation Error
D. Runtime Error
E. None of these
Answer» D. Runtime Error
Discussion
12.

What will be the output of the following C code?#include <stdio.h> int main() { printf("Hello Interview Mania! %d n", num); return 0; }

A. Hello Interview Mania! num
B. Compilation Error
C. Hello Interview Mania!
D. Hello Interview Mania! followed by a garbage value
E. None of these
Answer» C. Hello Interview Mania!
Discussion
13.

What would be the output of following program ?

A. Error
B. 15
C. 60
D. Garbage value
Answer» D. Garbage value
Discussion
14.

What will be the output of the following C code if these two files namely sample.c and sample1.c are linked and run?

A. 0 0
B. 0 12
C. 12 0
D. 12 12
E. None of these
Answer» D. 12 12
Discussion
15.

Automatic variables are allocated space in the form of a __________.

A. random
B. priority queue
C. queue
D. stack
E. None of these
Answer» E. None of these
Discussion
16.

Automatic variables are _________.

A. Declared within the keyword extern
B. Declared with auto keyword
C. Declared outside all functions
D. Declared within the scope of a block, usually a function
E. None of these
Answer» E. None of these
Discussion
17.

A local variable declaration with no storage class specified is by default ____

A. register
B. static
C. auto
D. extern
E. None of these
Answer» D. extern
Discussion
18.

Automatic variables are initialized to ___________.

A. Nothing
B. Zero
C. Junk value
D. Both Zero & Junk value
E. None of these
Answer» D. Both Zero & Junk value
Discussion
19.

Which of the following correctly represents a long double constant ?

A. 2.29
B. 2.29L
C. 2.29f
D. 2.29LF
Answer» C. 2.29f
Discussion
20.

Which of the following statement should be used to obtain a remainder after dividing 7.39 by 5.9 ?

A. rem = 7.39 % 5.9;
B. rem = modf(7.39, 5.9);
C. rem = fmod(7.39, 5.9):
D. rem = 7.39 mod 5.9
E. We cannot obtain the remainder in floating point division.
Answer» F.
Discussion
21.

What will be the n in the following C code?

A. static variable
B. global variable
C. automatic variable
D. register variable
E. None of these
Answer» D. register variable
Discussion
22.

What is the format identifier for static num = 200.05; ?

A. Illegal declaration due to absence of data type
B. %s
C. %d
D. %f
E. None of these
Answer» D. %f
Discussion
23.

Automatic variables are allocated memory in ___________.

A. Data segment
B. Code segment
C. stack
D. heap
E. None of these
Answer» D. heap
Discussion
24.

Register variables reside in ________.

A. main memory
B. stack
C. registers
D. heap
E. None of these
Answer» D. heap
Discussion
25.

Automatic variables are stored in ________.

A. heap
B. stack
C. data segment
D. register
E. None of these
Answer» C. data segment
Discussion
26.

Which among the following is wrong for register int n; ?

A. You cannot take the address of this variable
B. Access time to a is critical
C. Compiler generally ignores the request
D. All of above
E. None of these
Answer» F.
Discussion
27.

Which of the following is not a user-defined data type ?

A. <pre class="prettyprint lang-c">struct employ<br>{<br> char name[10];<br> float salary;<br> int workingdays;<br>};<br></pre>
B. <pre class="prettyprint lang-c">long int k = 65.5;</pre>
C. <pre class="prettyprint lang-c">enum day {Sun, Mon, Tue, Wed};</pre>
D. <pre class="prettyprint lang-c">union xyz<br>{<br> int k;<br> char ch[5];<br>};<br></pre>
Answer» C. <pre class="prettyprint lang-c">enum day {Sun, Mon, Tue, Wed};</pre>
Discussion
28.

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

A. * (star)
B. |(vertical line)
C. - (dash)
D. _ (underscore)
Answer» E.
Discussion
29.

Which of the following definition is correct ?

A. int length ;
B. char int ;
C. int long ;
D. float double ;
Answer» B. char int ;
Discussion
30.

Which of the following operations are INCORRECT ?

A. <pre class="prettyprint lang-c">int a = 15; a = a%5;<br></pre>
B. <pre class="prettyprint lang-c">short int b = 53; b = b%15;<br></pre>
C. <pre class="prettyprint lang-c">long int c = 125L; c = c % 14;<br></pre>
D. <pre class="prettyprint lang-c">float d = 6.128; d = d%7;<br></pre>
Answer» E.
Discussion
31.

Which part of the program address space is p stored in the following C code?

A. Data segment
B. Code/text segment
C. Stack
D. Bss segment
Answer» E.
Discussion
32.

Which part of the program address space is ptr stored in the following C code?

A. 0
B. Code/text segment
C. Data segment
D. Bss segment
E. Stack
Answer» D. Bss segment
Discussion
33.

Can variable p be accessed by functions in another source file?

A. No
B. Yes
C. Depends on the type of the variable
D. Only if static keyword is used
E. None of these
Answer» C. Depends on the type of the variable
Discussion
34.

Property of the external variable to be accessed by any source file is called by the C90 standard as __________.

A. global linkage
B. global scope
C. external scope
D. external linkage
E. None of these
Answer» E. None of these
Discussion
35.

What will be the output of the following C code (after linking to source file having definition of arrayA)?

A. Compile time error due to multiple definitio
B. Compile time error because size of array is not provided
C. Compile time error because datatype of array is not provided
D. Value of arrayA[0];
E. None of these
Answer» D. Value of arrayA[0];
Discussion
36.

What will be the output of the following C code (without linking the source file in which arrayA is defined)?

A. Linking error due to undefined reference
B. Compile time error because datatype of array is not provided
C. Compile time error because size of array is not provided
D. Interview Mania
E. None of these
Answer» E. None of these
Discussion
37.

What will be the sequence of allocation and deletion of variables in the following C code?

A. var->num, num->var
B. var->num, var->num
C. num->var, var->num
D. num->var, num->var
E. None of these
Answer» D. num->var, num->var
Discussion
38.

Comment on the following 2 C Example programs.

A. Scope of r is till the end of the main function in Example 2
B. In Example 1, variables p, q and r can be used anywhere in main function whereas in Example 2, variables q and r can be used only inside their respective blocks.
C. Both are same
D. Scope of p, q and r is till the end of the main function in Example 2.
E. None of these
Answer» C. Both are same
Discussion
39.

Which variable has the longest scope in the following C code?

A. p
B. q
C. r
D. both p and r
E. None of these
Answer» B. q
Discussion
40.

Variable name resolution (number of significant characters for the uniqueness of variable) depends on ___________.

A. Assemblers and loaders implementations
B. C language
C. Compiler and linker implementations
D. All of above
E. None of these
Answer» D. All of above
Discussion
41.

All keywords in C are in ____________.

A. CamelCase letters
B. LowerCase letters
C. UpperCase letters
D. All of above
E. None of these
Answer» C. UpperCase letters
Discussion
42.

What is the problem in following variable declaration?

A. The special character -
B. The special character ?
C. The variable name begins with an integer
D. All of above
E. None of these
Answer» E. None of these
Discussion
43.

What will happen if the following C code is executed?

A. 10
B. 12
C. 15
D. Compilation Error
E. None of these
Answer» D. Compilation Error
Discussion
44.

Will the following C code compile without any error?

A. No
B. Yes
C. Garbage value
D. Depends on the C standard implemented by compilers
E. None of these
Answer» E. None of these
Discussion
45.

Global variables are ____________.

A. External
B. Internal
C. Both External and Internal
D. All of above
E. None of these
Answer» B. Internal
Discussion
46.

Which of the following is an external variable in the following C code?

A. p
B. q
C. r
D. s
E. None of these
Answer» E. None of these
Discussion
47.

Functions in C are always _________.

A. External and Internal are not valid terms for functions
B. Internal
C. External
D. Both Internal and External
E. None of these
Answer» D. Both Internal and External
Discussion
48.

Which of the following format identifier can never be used for the variable var?

A. %s
B. %c
C. %d
D. %f
E. None of these
Answer» E. None of these
Discussion