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151.

Which alternative can replace the throw statement?(a) for(b) break(c) return(d) exit

Answer» Right option is (c) return

Easiest explanation - throw and return does the same job as return a value. So it can be replaced.
Discussion
152.

Why we use :: template-template parameter?(a) binding(b) rebinding(c) both binding & rebinding(d) reusing

Answer» Correct option is (c) both binding & rebinding

To explain I would say: It is used to adapt a policy into binary ones.
Discussion
153.

Which container is used to store elements as key-value pair?(a) map(b) multimap(c) unordered map(d) all of the mentioned

Answer» Correct choice is (d) all of the mentioned

Easy explanation - C++ provides these three containers(map, multimap and unordered map) to store elements as key-value pair.
Discussion
154.

What is Inheritance in C++?(a) Wrapping of data into a single class(b) Deriving new classes from existing classes(c) Overloading of classes(d) Classes with same names

Answer» Correct answer is (b) Deriving new classes from existing classes

The best explanation: Inheritance is the concept of OOPs in which new classes are derived from existing classes in order to reuse the properties of classes defined earlier.
Discussion
155.

How many specifiers are used to derive a class?(a) 1(b) 2(c) 3(d) 4

Answer» Right choice is (c) 3

To explain: There are 3 specifiers used to derive a class. They are private, protected and public.
Discussion
156.

What is the use of RAII in c++ programming?(a) Improve the exception safety(b) Terminate the program(c) Exit from the block(d) Crash the compiler

Answer» Right option is (a) Improve the exception safety

Easy explanation - RAII is used to improve the exception safety.
Discussion
157.

Which statement is incorrect about virtual function.(a) They are used to achieve runtime polymorphism(b) They are used to hide objects(c) Each virtual function declaration starts with the virtual keyword(d) All of the mentioned

Answer» Right choice is (b) They are used to hide objects

Best explanation: Virtual function are used to achieve runtime polymorphism by calling the right function during runtime. Their declaration starts with a virtual keyword.
Discussion
158.

Which is the correct syntax of declaring a virtual function?(a) virtual int func();(b) virtual int func(){};(c) inline virtual func();(d) inline virtual func(){};

Answer» The correct answer is (a) virtual int func();

To explain I would say: To make a function virtual function we just need to add virtual keyword at the starting of the function declaration.
Discussion
159.

The concept of deciding which function to invoke during runtime is called ______________________(a) late binding(b) dynamic linkage(c) static binding(d) both late binding and dynamic linkage

Answer» Right option is (d) both late binding and dynamic linkage

To explain I would say: The concept of deciding which function to invoke during runtime is called late binding or dynamic linkage. Late binding because function binding to the object is done during runtime. Dynamic linkage because this binding is done during runtime.
Discussion
160.

Pick out the correct answer.(a) Exceptions are not suitable for critical points in code(b) Exception are suitable for critical points in code(c) Exceptions are used when postconditions of a function cannot be satisfied(d) Throw block should be placed after try block

Answer» Correct answer is (a) Exceptions are not suitable for critical points in code

The explanation is: If there is many number of exceptions in the program means, We have to use multiple catch statement and it is hard to keep track of the program.
Discussion
161.

How many runtime error messages associated with exception?(a) 2(b) 4(c) 5(d) infinite

Answer» Right answer is (b) 4

For explanation: There are four runtime error messages associated with exceptions. They are overflow_error, range_error, system_error and underflow_error.
Discussion
162.

Where exception are handled?(a) inside the program(b) outside the regular code(c) both inside or outside(d) main program

Answer» Correct answer is (b) outside the regular code

The explanation: Exception are handled outside the regular code.
Discussion
163.

Which class is used to design the base class?(a) abstract class(b) derived class(c) base class(d) derived & base class

Answer» Right option is (a) abstract class

For explanation: Abstract class is used to design base class because functions of abstract class can be overridden in derived class hence derived class from same base class can have common method with different implementation, hence forcing encapsulation.
Discussion
164.

Which is also called as abstract class?(a) virtual function(b) pure virtual function(c) derived class(d) base class

Answer» Correct option is (b) pure virtual function

The explanation: Classes that contain at least one pure virtual function are called as abstract base classes.
Discussion