Railway GK Questions 2026

W. A. Rodgers and H. S. Panwar of the Wildlife Institute of India proposed the ten-zone biogeographic classification in 1988 while planning a representative wildlife protected area network for the country, and the ten zones with their biotic provinces are still the official framework.

Private is the most restricted access specifier and is also the default for a C++ class, so private data members can be read or changed only by the member functions of that class, and by a friend function or friend class if one is declared.

Java deliberately leaves out multiple inheritance of classes to avoid the ambiguity that arises when two base classes supply a member of the same name, the problem often called the diamond problem, and it provides interfaces so that a class can still take behaviour from more than one source.

A constructor carries the same name as its class, is called automatically the moment an object is created and is normally used to give the data members their initial values; it returns no value at all, not even void, and it can be overloaded.

Inheritance lets a derived, child or sub class take the members of a base, parent or super class and add its own, which is the main route to code reuse in object-oriented programming; its forms are single, multiple, multilevel, hierarchical and hybrid.

A class only describes the data members and member functions that its objects will have, while an object is created from the class, occupies memory and holds actual values; one class may have any number of objects.

Overloading means defining several functions of the same name in the same class with different numbers or types of parameters, so the compiler decides which one to call; because the decision is taken before the program runs, it is called compile-time or static polymorphism.

James Gosling and his team at Sun Microsystems developed Java, which was first called Oak and was released under the name Java in 1995; its programs are compiled to bytecode and run on the Java Virtual Machine, which makes them platform independent.

Bjarne Stroustrup developed the language at Bell Laboratories, starting it as C with Classes and giving it the name C++ in 1983; it adds classes, inheritance and polymorphism to C while keeping C procedural power, which is why it is called a hybrid language.

Abstraction presents only what the user needs, such as the accelerator and brake of a car, and keeps the internal working out of sight; in C++ it is obtained through abstract classes with pure virtual functions and in Java through interfaces and abstract classes.

Encapsulation means binding the data members and the member functions that act on them inside one unit, the class, and keeping the data private so that it can be reached only through the methods provided; the standard illustration is a capsule holding the medicine inside it.

Recursion is a general programming technique in which a function calls itself, and it works equally well in procedural languages such as C, so it is not a feature of the object-oriented approach.

Simula 67, designed by Ole-Johan Dahl and Kristen Nygaard, introduced the ideas of class, object and inheritance and is therefore treated as the first object-oriented language, from which C++ and Java later borrowed.

Bundi, in the Hadoti region, has dozens of baoris and is therefore called the city of stepwells; the grandest is Rani ji ki Baori, built in 1699 by Rani Nathavati, with a high arched gate and carved elephant brackets.

In south Bihar the pyne is a diversion channel that takes flood water from a river, and the ahar is a catchment basin with embankments on three sides in which that water is stored for the rice crop, a system suited to the region hard soil and uneven rainfall.

A tanka is a covered underground cistern, usually circular, dug in the courtyard of a house or in a public square in western Rajasthan, into which rain from the roof or a paved catchment is led and stored for drinking through the dry months.

Both lie in the Mehrauli area of Delhi; Gandhak ki Baoli, from the time of Iltutmish, takes its name from the sulphurous smell of its water, and Rajon ki Baoli belongs to the Lodi period and is named after the masons who once used it.

Adalaj ni Vav stands at Adalaj in Gandhinagar district and was completed in 1499 during the reign of Mahmud Begada; its carving mixes Hindu motifs with Islamic geometric and floral work, and the queen Rudabai is remembered in its story.

The Kallanai, known in English as the Grand Anicut, is a dam of unhewn stone laid across the Kaveri in the Thanjavur region and is credited to the early Chola king Karikala; it still spreads the river water over the delta.

Dholavira, on Khadir island in the Rann of Kutch, had no perennial river, so its builders dammed the Manhar and Mansar streams and cut a series of large reservoirs inside the walled town, the most advanced water engineering known from the Harappan civilisation.