RRB JE 2019 Previous Year GK Questions with Answers

Borax, sodium tetraborate, is the salt of a strong base, sodium hydroxide, and a weak acid, boric acid, so its solution in water is basic.

Citrus fruits such as orange, lemon, lime and grapefruit owe their sharp sour taste to citric acid, which is the acid textbooks name for this family and the one examiners expect here.

Each of the other three statements is correct on its own, which is exactly why the combined option is the answer.

It is the world authority on chemical nomenclature, so it approves the names and symbols of newly discovered elements, standardises the naming of compounds and maintains the recommended values of atomic weights.

NASA is the civilian space agency of the United States, established in 1958 after the launch of Sputnik, with its headquarters at Washington DC.

STUDSAT, short for Student Satellite, was the first pico satellite built in India. A pico satellite is one that weighs under about one kilogram, and STUDSAT weighed less than that.

The To field of a mail window is meant for the addresses of the people the letter is written to.

Pressing F5 anywhere in a presentation closes the editing window and runs the slide show from slide one, whichever slide you were working on.

Electronegativity is the tendency of an atom to attract a shared pair of electrons towards itself. It increases from left to right across a period, as nuclear charge grows, and decreases down a group, as each new shell puts the outer electrons further from the nucleus.

The potential difference between two points in a circuit is defined as the work done in moving a unit positive charge from one point to the other.

By Ohm's law, at a constant temperature the current through a conductor is directly proportional to the potential difference across its ends, since the current equals the potential difference divided by the resistance.

The Stockholm Convention was adopted in 2001 and came into force in 2004.

Founded in 1948 and based in Switzerland, it maintains the Red List of Threatened Species, which grades species as least concern, near threatened, vulnerable, endangered, critically endangered, extinct in the wild or extinct.

Article 85(1) says the President shall summon each House to meet at such time and place as he or she thinks fit, but six months shall not intervene between its last sitting in one session and the date appointed for its first sitting in the next session.

In the 8085A microprocessor the program counter is a 16-bit register that always holds the memory address of the next instruction, or op-code, to be fetched.

Integrated circuits are classified by how many logic gates are packed on a single chip.

In an operating system a process passes through the states new, ready, running, waiting and terminated.

A tunnel diode, also called an Esaki diode after Leo Esaki who made it in 1957, is heavily doped on both sides, so its depletion layer is extremely thin and electrons cross it by quantum tunnelling.

The system development life cycle, or SDLC, is the set of stages followed while building a software system, and feasibility study, coding and implementation are all stages of it.

Newton's universal law of gravitation states that every two bodies attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them, written F = GMm/d².