Explore topic-wise MCQs in Engineering.

This section includes 226 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.

101.

Which of the following statement is correct about the program given below? #include<iostream.h> class IndiaBix { int x, y; public: void SetValue(int &xx, int &yy) { x = xx++; y = yy; cout<< xx << " " << yy; } }; int main() { int x = 10; int &y = x; IndiaBix objBix; objBix.SetValue(x , y); return 0; }

A. The program will print the output 10 10.
B. The program will print the output 10 11.
C. The program will print the output 11 10.
D. The program will print the output 11 11.
E. It will result in a compile time error.
Answer» E. It will result in a compile time error.
Discussion
102.

Which of the following statement is correct about the program given below? #include<iostream.h> int main() { int x = 10, y = 20; int *ptr = &x; int &ref = y; *ptr++; ref++; cout<< x << " " << y; return 0; }

A. The program will print the output 10 20.
B. The program will print the output 10 21.
C. The program will print the output 11 20.
D. The program will print the output 11 21.
E. It will result in a compile time error.
Answer» C. The program will print the output 11 20.
Discussion
103.

Which of the following statement is correct about the program given below? #include<iostream.h> class IndiaBix { int x, y; public: IndiaBix(int &xx, int &yy) { x = xx; y = yy; Display(); } void Display() { cout<< x << " " << y; } }; int main() { int x1 = 10; int &p = x1; int y1 = 20; int &q = y1; IndiaBix objBix(p, q); return 0; }

A. It will result in a compile time error.
B. The program will print the output 10 20.
C. The program will print two garbage values.
D. The program will print the address of variable x1 and y1.
Answer» C. The program will print two garbage values.
Discussion
104.

Which of the following statement is correct about the program given below? #include<iostream.h> class IndiaBix { int x, y; public: void SetValue(int &a, int &b) { a = 100; x = a; y = b; Display(); } void Display() { cout<< x << " " << y; } }; int main() { int x = 10; IndiaBix objBix; objBix.SetValue(x, x); return 0; }

A. The program will print the output 100 10.
B. The program will print the output 100 100.
C. The program will print the output 100 garbage.
D. The program will print two garbage values.
E. It will result in a compile time error.
Answer» C. The program will print the output 100 garbage.
Discussion
105.

Which of the following statement is correct about the program given below? #include<iostream.h> class IndiaBix { int x, y; public: void SetValue(int &xx, int &yy) { x = xx ++; y = yy; Display(); } void Display() { cout<< x << " " << y; } }; int main() { int x = 10; int &y = x; IndiaBix objBix; objBix.SetValue(x , y); return 0; }

A. The program will print the output 10 10.
B. The program will print the output 10 11.
C. The program will print the output 11 11.
D. The program will print the output 11 10.
E. It will result in a compile time error.
Answer» C. The program will print the output 11 11.
Discussion
106.

What will be the output of the following program? #include<iostream.h> class BixTest { public: BixTest(int &x, int &y) { x++; y++; } }; int main() { int a = 10, b = 20; BixTest objBT(a, b); cout<< a << " " << b; return 0; }

A. 10 20
B. 11 21
C. Garbage Garbage
D. It will result in a compile time error.
Answer» C. Garbage Garbage
Discussion
107.

Which of the following statement is correct about the program given below? #include<iostream.h> int main() { int x = 0; int &y = x; y = 5; while(x <= 5) { cout<< y++ << " "; x++; } cout<< x; return 0; }

A. The program will print the output 5 6 7 8 9 10.
B. The program will print the output 5 6 7 8 9 10 7.
C. The program will print the output 5 7.
D. It will result in a compile time error.
Answer» D. It will result in a compile time error.
Discussion
108.

Which of the following statement is correct about the program given below? #include<iostream.h> int main() { int m = 2, n = 6; int &x = m; int &y = n; m = x++; x = m++; n = y++; y = n++; cout<< m << " " << n; return 0; }

A. The program will print output 2 6.
B. The program will print output 3 7.
C. The program will print output 4 8.
D. The program will print output 5 9.
E. The program will print output 6 10.
Answer» D. The program will print output 5 9.
Discussion
109.

Which of the following statement is correct about the program given below? #include<iostream.h> int main() { int m = 2, n = 6; int &x = m++; int &y = n++; m = x++; x = m++; n = y++; y = n++; cout<< m << " " << n; return 0; }

A. The program will print output 3 7.
B. The program will print output 4 8.
C. The program will print output 5 9.
D. The program will print output 6 10.
E. It will result in a compile time error.
Answer» F.
Discussion
110.

Which of the following statement is correct about the program given below? #include<iostream.h> enum xyz { a, b, c }; int main() { int x = a, y = b, z = c; int &p = x, &q = y, &r = z; p = ++x; q = ++y; r = ++c; cout<< p << q << r; return 0; }

A. The program will print the output 1 2 3.
B. The program will print the output 2 3 4.
C. The program will print the output 0 1 2.
D. It will result in a compile time error.
Answer» E.
Discussion
111.

Which of the following statement is correct about the program given below? #include<iostream.h> int main() { int arr[] = {1, 2 ,3, 4, 5}; int &zarr = arr; for(int i = 0; i <= 4; i++) { arr[i] += arr[i]; } for(i = 0; i <= 4; i++) cout<< zarr[i]; return 0; }

A. The program will print the output 1 2 3 4 5.
B. The program will print the output 2 4 6 8 10.
C. The program will print the output 1 1 1 1 1.
D. It will result in a compile time error.
Answer» E.
Discussion
112.

Which of the following statement is correct about the program given below? #include<iostream.h> struct Bix { short n; }; int main() { Bix b; Bix& rb = b; b.n = 5; cout << b.n << " " << rb.n << " "; rb.n = 8; cout << b.n << " " << rb.n; return 0; }

A. It will result in a compile time error.
B. The program will print the output 5 5 5 8.
C. The program will print the output 5 5 8 8.
D. The program will print the output 5 5 5 5.
Answer» D. The program will print the output 5 5 5 5.
Discussion
113.

What will be the output of the following program? #include <iostream.h> enum xyz { a, b, c }; int main() { int x = a, y = b, z = c; int &p = x, &q = y, &r = z; p = z; p = ++q; q = ++p; z = ++q + p++; cout<< p << " " << q << " " << z; return 0; }

A. 2 3 6
B. 4 4 7
C. 4 5 8
D. 3 4 6
Answer» C. 4 5 8
Discussion
114.

Which of the following statement is correct about the program given below? #include<iostream.h> int BixFunction(int m) { m *= m; return((10)*(m /= m)); } int main() { int c = 9, *d = &c, e; int &z = e; e = BixFunction(c-- % 3 ? ++*d :(*d *= *d)); z = z + e / 10; cout<< c << " " << e; return 0; }

A. It will result in a compile time error.
B. The program will print the output 64 9.
C. The program will print the output 64 10.
D. The program will print the output 64 11.
Answer» E.
Discussion
115.

Which of the following statements is correct? Pointer to a reference and reference to a pointer both are valid. When we use reference, we are actually referring to a referent.

A. Only 1 is correct.
B. Only 2 is correct.
C. Both 1 and 2 are correct.
D. Both 1 and 2 are incorrect.
Answer» D. Both 1 and 2 are incorrect.
Discussion
116.

A reference is declared using the _____ symbol.

A. <i class="cpp-code">&amp;&amp;</i>
B. <i class="cpp-code">&amp;</i>
C. <i class="cpp-code">||</i>
D. <i class="cpp-code">!</i>
Answer» C. <i class="cpp-code">||</i>
Discussion
117.

Which of the following statement is correct about the program given below? #include&lt;iostream.h&gt; int main() { int x = 80; int y&amp; = x; x++; cout &lt;&lt; x &lt;&lt; " " &lt;&lt; --y; return 0; }

A. The program will print the output 80 80.
B. The program will print the output 81 80.
C. The program will print the output 81 81.
D. It will result in a compile time error.
Answer» E.
Discussion
118.

Which of the following statement is correct about the program given below? #include&lt;iostream.h&gt; int main() { int x = 80; int &amp;y = x; x++; cout &lt;&lt; x &lt;&lt; " " &lt;&lt; --y; return 0; }

A. The program will print the output 80 80.
B. The program will print the output 81 80.
C. The program will print the output 81 81.
D. It will result in a compile time error.
Answer» B. The program will print the output 81 80.
Discussion
119.

Which of the following statement is correct about the program given below? #include&lt;iostream.h&gt; int main() { int x = 10; int &amp;y = x; x++; cout&lt;&lt; x &lt;&lt; " " &lt;&lt; y++; return 0; }

A. The program will print the output 11 12.
B. The program will print the output 12 11.
C. The program will print the output 12 13.
D. It will result in a compile time error.
Answer» C. The program will print the output 12 13.
Discussion
120.

Which of the following statement is correct about the program given below? #include&lt;iostream.h&gt; int main() { int x = 10; int &amp;y = x; x = 25; y = 50; cout&lt;&lt; x &lt;&lt; " " &lt;&lt; --y; return 0; }

A. The program will print the output 25 49.
B. It will result in a compile time error.
C. The program will print the output 50 50.
D. The program will print the output 49 49.
Answer» E.
Discussion
121.

Which of the following statement is correct about the program given below? #include&lt;iostream.h&gt; enum bix { a=1, b, c }; int main() { int x = c; int &amp;y = x; int &amp;z = x; y = b; cout&lt;&lt; z--; return 0; }

A. It will result in a compile time error.
B. The program will print the output 1.
C. The program will print the output 2.
D. The program will print the output 3.
Answer» D. The program will print the output 3.
Discussion
122.

When are the Global objects destroyed?

A. When the control comes out of the block in which they are being used.
B. When the program terminates.
C. When the control comes out of the function in which they are being used.
D. As soon as local objects die.
Answer» C. When the control comes out of the function in which they are being used.
Discussion
123.

Which constructor function is designed to copy objects of the same class type?

A. Create constructor
B. Object constructor
C. Dynamic constructor
D. Copy constructor
Answer» E.
Discussion
124.

Copy constructor must receive its arguments by __________ .

A. either pass-by-value or pass-by-reference
B. only pass-by-value
C. only pass-by-reference
D. only pass by address
Answer» D. only pass by address
Discussion
125.

Which of the following statements is correct? A reference is not a constant pointer. A referenced is automatically de-referenced.

A. Only 1 is correct.
B. Only 2 is correct.
C. Both 1 and 2 are correct.
D. Both 1 and 2 are incorrect.
Answer» C. Both 1 and 2 are correct.
Discussion
126.

Which of the following statements is correct? An array of references is acceptable. We can also create a reference to a reference.

A. Only 1 is correct.
B. Only 2 is correct.
C. Both 1 and 2 are correct.
D. Both 1 and 2 are incorrect.
Answer» E.
Discussion
127.

Which of the following statements is correct? Once the variable and the reference are linked they are tied together. Once the reference of a variable is declared another reference of that variable is not allowed.

A. Only 1 is correct.
B. Only 2 is correct.
C. Both 1 and 2 are correct.
D. Both 1 and 2 are incorrect.
Answer» B. Only 2 is correct.
Discussion
128.

Which of the following statements is correct? We can return a global variable by reference. We cannot return a local variable by reference.

A. Only 1 is correct.
B. Only 2 is correct.
C. Both 1 and 2 are correct.
D. Both 1 and 2 are incorrect.
Answer» C. Both 1 and 2 are correct.
Discussion
129.

Reference is like a _____.

A. Pointer
B. Structure
C. Macro
D. Enum
Answer» B. Structure
Discussion
130.

What happens when a class with parameterized constructors and having no default constructor is used in a program and we create an object that needs a zero-argument constructor?

A. Compile-time error.
B. Preprocessing error.
C. Runtime error.
D. Runtime exception.
Answer» B. Preprocessing error.
Discussion
131.

Can a class have virtual destructor?

A. Yes
B. No
Answer» B. No
Discussion
132.

A constructor that accepts __________ parameters is called the default constructor.

A. one
B. two
C. no
D. three
Answer» D. three
Discussion
133.

Destructor has the same name as the constructor and it is preceded by ______ .

A. !
B. ?
C. ~
D. $
Answer» D. $
Discussion
134.

For automatic objects, constructors and destructors are called each time the objects

A. enter and leave scope
B. inherit parent class
C. are constructed
D. are destroyed
Answer» B. inherit parent class
Discussion
135.

Functions can be declared to return a reference type. There are reasons to make such a declaration/Which of the following reasons are correct? The information being returned is a large enough object that returning a reference is more efficient than returning a copy. The type of the function must be a R-value.

A. Only 1 is correct.
B. Only 2 is correct.
C. Both 1 and 2 are correct.
D. Both 1 and 2 are incorrect.
Answer» D. Both 1 and 2 are incorrect.
Discussion
136.

Which of the following statements is correct? Change a reference changes the referent. We can create an array of references.

A. Only 1 is correct.
B. Only 2 is correct.
C. Both 1 and 2 are correct.
D. Both 1 and 2 are incorrect.
Answer» B. Only 2 is correct.
Discussion
137.

Which of the following statement is correct about the references?

A. A reference must always be initialized within functions.
B. A reference must always be initialized outside all functions.
C. A reference must always be initialized.
D. Both A and C.
Answer» D. Both A and C.
Discussion
138.

Which of the following statements is correct? Once a reference variable has been defined to refer to a particular variable it can refer to any other variable. A reference is not a constant pointer.

A. Only 1 is correct.
B. Only 2 is correct.
C. Both 1 and 2 are correct.
D. Both 1 and 2 are incorrect.
Answer» E.
Discussion
139.

Which of the following type of class allows only one object of it to be created?

A. Virtual class
B. Abstract class
C. Singleton class
D. Friend class
Answer» D. Friend class
Discussion
140.

Which of the following is not the member of class?

A. Static function
B. Friend function
C. Const function
D. Virtual function
Answer» C. Const function
Discussion
141.

Which of the following is not a type of constructor?

A. Copy constructor
B. Friend constructor
C. Default constructor
D. Parameterized constructor
Answer» C. Default constructor
Discussion
142.

Which of the following concepts means determining at runtime what method to invoke?

A. Data hiding
B. Dynamic Typing
C. Dynamic binding
D. Dynamic loading
Answer» D. Dynamic loading
Discussion
143.

Which of the following is the correct class of the object cout?

A. <i class="cpp-code">iostream</i>
B. <i class="cpp-code">istream</i>
C. <i class="cpp-code">ostream</i>
D. <i class="cpp-code">ifstream</i>
Answer» D. <i class="cpp-code">ifstream</i>
Discussion
144.

Which of the following cannot be used with the keyword virtual?

A. class
B. member functions
C. constructor
D. destructor
Answer» D. destructor
Discussion
145.

Which of the following functions are performed by a constructor?

A. Construct a new class
B. Construct a new object
C. Construct a new function
D. Initialize objects
Answer» E.
Discussion
146.

Which one of the following options is correct about the statement given below? The compiler checks the type of reference in the object and not the type of object.

A. Inheritance
B. Polymorphism
C. Abstraction
D. Encapsulation
Answer» C. Abstraction
Discussion
147.

Which of the following concepts means adding new components to a program as it runs?

A. Data hiding
B. Dynamic typing
C. Dynamic binding
D. Dynamic loading
Answer» E.
Discussion
148.

Which of the following operator is overloaded for object cout?

A. <i class="cpp-code">&gt;&gt;</i>
B. <i class="cpp-code">&lt;&lt;</i>
C. <i class="cpp-code">+</i>
D. <i class="cpp-code">=</i>
Answer» C. <i class="cpp-code">+</i>
Discussion
149.

Which of the following is correct about class and structure?

A. class can have member functions while structure cannot.
B. class data members are public by default while that of structure are private.
C. Pointer to structure or classes cannot be declared.
D. class data members are private by default while that of structure are public by default.
Answer» E.
Discussion
150.

Which of the following concepts means wrapping up of data and functions together?

A. Abstraction
B. Encapsulation
C. Inheritance
D. Polymorphism
Answer» C. Inheritance
Discussion