RRB JE Previous Year GK Questions

When three forces are represented by the sides of a triangle taken in order, their vector sum is zero, because the three sides close the triangle, so the body cannot be pushed away; but the lines of action are different, so the system reduces to a couple.

Temperature is a measure of the average kinetic energy of the particles of a substance, in a solid as in a gas: in a solid the particles are held in fixed positions but vibrate about them, and heating makes the vibrations faster and wider, so the average kinetic energy rises…

A metal more reactive than hydrogen displaces it from a dilute acid, so zinc with dilute sulphuric acid gives zinc sulphate and hydrogen gas, and this is the standard laboratory preparation of the gas; the test is that it burns with a pop.

The country came into being in December 1971 at the end of the liberation war, in which the Indian armed forces entered the conflict after Pakistani air strikes codenamed Operation Chengiz Khan on 3 December and accepted the surrender at Dhaka on 16 December.

It is a thin, strap-like muscle that runs across the front of the thigh from the hip bone to the inner side of the knee, and because it crosses two joints it is the longest muscle of the human body; it helps in bending the hip and the knee and…

Unshielded twisted pair cable has no metal foil or braid around its pairs, so it resists electromagnetic interference less well than shielded twisted pair, not better; the only protection it has is the twisting of each pair, which cancels much of the noise picked up by the two wires.

The working rule for charging a storage battery is that the charging current should be about one-tenth of the ampere-hour capacity of the battery, which is called the C by 10 rate.

Aluminium is the most abundant metal in the crust of the earth, making up about eight per cent of it by weight.

The Lucknow Pact of 1916 was an agreement between the Congress and the Muslim League. It was signed at the Lucknow session, where Ambika Charan Mazumdar presided for the Congress.

Every citizen of India who is eighteen years of age or more may vote, and the age is the same for men and women.

Sulphur dioxide is an air pollutant but it is not counted among the greenhouse gases. A greenhouse gas is one that lets sunlight through but absorbs the long wave infrared radiation the earth sends back, so it warms the lower atmosphere.

Under monopolistic competition a single firm faces a demand curve that is relatively elastic, so it slopes downward but is fairly flat.

Fuehrer is the German word for leader, and Adolf Hitler took it as his title in Germany. Hitler led the Nazi Party, became Chancellor in January 1933, and after the death of President Hindenburg in 1934 merged the two offices and styled himself Fuehrer and Reich Chancellor.

Archimedes used his principle to test whether the crown of King Hiero II of Syracuse was pure gold. The principle says that a body immersed in a fluid is buoyed up by a force equal to the weight of the fluid it displaces.

Gravitational force is directly proportional to each mass, so doubling one mass doubles the force. Newton law of universal gravitation states that the force between two bodies is F equal to G m1 m2 divided by r squared.

The upthrust on a body is the resultant of the pressure forces of the fluid around it, and that resultant acts through the centre of gravity of the fluid the body has pushed aside, which is why the point is called the centre of buoyancy.

A floating body displaces its own weight of fluid, so the fraction of its volume that lies below the surface equals the ratio of its density to the density of the fluid, here 920 divided by 1000, which is 0.92.

An optical fibre carries information as pulses of light, not as an electric current, so its core and cladding must be transparent and not conducting.

The decibel, written dB, is the unit in which the intensity level of sound is expressed, and it is named after Alexander Graham Bell.

The Sabarmati rises in the Aravalli Range in the Udaipur district of Rajasthan, then flows south-west across Gujarat and empties into the Gulf of Khambhat in the Arabian Sea after a course of about 371 km.