RRB ALP 2019 Previous Year GK Questions with Answers

Beta is the current gain of a bipolar junction transistor in the common emitter configuration: a very small change in the base current produces a much larger change in the collector current, and the ratio of the two is beta, which commonly lies between about twenty and several hundred.

In a bipolar junction transistor the emitter injects carriers, the thin lightly doped base lets most of them through, and the collector gathers them, so the emitter current divides into a large collector current and a small base current; alpha is defined as the collector current divided by the emitter…

Fires are sorted into classes by what is burning, and a fire fed by flammable liquids such as petrol, diesel, kerosene, oil, paint or thinner is a class B fire.

In a class 3 lever the fulcrum is at one end, the effort is applied in the middle and the load sits at the far end.

Fires are grouped by what is burning, and Class D covers burning metals such as magnesium, sodium, potassium, titanium and aluminium powder.

The safest way to handle a binary subtraction in an examination is to convert both numbers to decimal, subtract, and convert the answer back.

Water behaves unlike most liquids between 0 and 4 degrees Celsius, a behaviour called the anomalous expansion of water. Almost every substance shrinks as it is cooled, but water shrinks only until it reaches 4 degrees Celsius.

A binary number is written with only the digits 0 and 1, and each place stands for a power of two.

Brakes work on friction: a lining is pressed against a moving drum or disc, and the rubbing force slows the wheel down.

Boron has three electrons in its outermost shell, so it is a trivalent element and is used as a p-type dopant.

ABS stands for anti-lock braking system, a safety device that keeps the wheels from locking during hard braking.

A centre-tap full wave rectifier needs two p-n junction diodes, one for each half of the input cycle. The secondary winding of the transformer is tapped at its middle, so its two halves give equal voltages of opposite sign.

A silicon diode in forward bias drops about 0.7 volt across itself, whatever the supply voltage is.

Angkor Wat stands near Siem Reap in Cambodia and is the largest religious monument in the world. It was built in the early twelfth century by King Suryavarman II of the Khmer empire as a temple of Vishnu, and it later became a Buddhist place of worship.

Unwanted bulk messages sent to many people to advertise something are called spam. Spam usually arrives as e-mail, but the same word is used for unwanted SMS, blog comments and social media messages.

The Hornbill Festival is held every year from 1 to 10 December at Kisama Heritage Village near Kohima, the capital of Nagaland.

Potential difference is the work done to move a unit charge between two points, and its SI unit is the volt.