LG Placement Paper -: Object-oriented programming (OOP) Questions And Answers

LG Previous Years Solved Sample Placement Papers

1. Which of the following problem causes an exception?

   A: Missing semicolon in statement in main().

   B: A problem in calling function

   C: A syntax error

   D: A run-time error

   Ans: D

2. 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

   Ans: B

3. What will be the output of the following program?

   #include <iostream.h>
   void main()
   {
     float x;
     x = (float)9/2;
     cout << x;
   }
       

   A: 4.5

   B: 4.0

   C: 4

   D: 5

   Ans: A

4. The term __________ means the ability to take many forms.

   A: Inheritance

   B: Polymorphism

   C: Member function

   D: Encapsulation

   Ans: B

5. Runtime polymorphism is achieved by

   A: Friend function

   B: Virtual function

   C: Operator overloading

   D: Function overloading

   Ans: B

6. Access to private data

   A: Restricted to methods of the same class

   B: Restricted to methods of other classes

   C: Available to methods of the same class and other classes

   D: Not an issue because the program will not compile

   Ans: B

7. Additional information sent when an exception is thrown may be placed in

   A: The throw keyword

   B: The function that caused the error

   C: The catch block

   D: An object of the exception class

   Ans: C

8. What is the output of the following code

   char symbol[3] = {'a', 'b', 'c'};
   for (int index = 0; index < 3; index++)
     cout << symbol[index];
       

   A: a b c

   B: "abc"

   C: abc

   D: 'abc'

   Ans: C

9. Identify the operator that is NOT used with pointers

   A: ->

   B: &

   C: *

   D: >>

   Ans: D

10. Overloading a postfix increment operator by means of a member function takes

    A: No argument

    B: One argument

    C: Two arguments

    D: Three arguments

    Ans: A

11. Which of the following is not the characteristic of constructor?

    A: They should be declared in the public section.

    B: They do not have return type.

    C: They cannot be inherited.

    D: They can be virtual.

    Ans: D

12. You separated a derived class name from its access specifier with

    A: A colon

    B: Two colons

    C: At least one space

    D: A semi colon

    Ans: B

13. The members of a class by default are

    A: Public

    B: Protected

    C: Private

    D: Mandatory to specify

    Ans: C

14. The type of value that a function sends back to the function that calls it is known as its _____

    A: type

    B: return value

    C: reference data

    D: sentinel

    Ans: B

15. Which of the following are never inherited?

    A: public data members

    B: constructor functions

    C: void functions

    D: overloaded + operators

    Ans: B

16. A function's purpose is to print customer data. Which of the following is the best name for this function?

    A: pcd(). It's short for "print customer data" and takes few keystrokes

    B: Printcustomerdata(). It states everything the function will do

    C: printCustomer(). It states the function's purpose and is easy to read

    D: lastFunction(). It is the final function called in most programs, and this name identifies the function's timing

    Ans: C

17. The function strcmp("Jose", "JOSE") will return _____

    A: -1

    B: 0

    C: 1

    D: null

    Ans: C