RRB NTPC GK Questions 2026

Named after the Croatian seismologist who noticed that earthquake waves suddenly speed up at a certain depth, it marks the base of the crust and the top of the mantle, and is commonly shortened to the Moho.

The erg is the unit of work in the CGS system, being one dyne of force acting through one centimetre, and since one newton is one lakh dyne and one metre is a hundred centimetre, one joule works out to ten million erg, that is 10 raised to the power…

A stone at rest at a height has no motion and therefore no kinetic energy, but it possesses gravitational potential energy equal to its mass into the acceleration due to gravity into the height of the tower.

The force he applies to support the load acts vertically upward, while his displacement along the platform is horizontal, so the angle between force and displacement is ninety degrees and the work done against gravity is zero, however tired he may feel.

The work-energy theorem states that the net work done on a body equals the difference between its final and initial kinetic energies, which is why a push that speeds a body up does positive work while friction, which slows it, does negative work.

A dynamo, also called a generator, is turned by some mechanical agency such as falling water, steam or a bicycle wheel, and the rotation of a coil in a magnetic field produces an electric current by electromagnetic induction.

Kinetic energy is half the mass into the square of the speed, so when the speed is multiplied by two the energy is multiplied by two squared, that is four.

Household electricity is billed in these units, and one kilowatt hour, popularly called one unit, is the energy consumed when an appliance of one kilowatt runs for one hour; in SI terms it equals 3.6 million joule.

The horsepower is an older unit of power that survives in the rating of motors and vehicles, and one horsepower is taken as about 746 watt, that is roughly three quarters of a kilowatt.

Power is the rate of doing work, that is work divided by the time taken, so its unit is the joule per second, which is named the watt after James Watt.

Kinetic energy is the energy a body has because of its motion, and it grows with the square of the speed, so a body moving twice as fast carries four times the kinetic energy.

Work equals force into displacement into the cosine of the angle between them, and the cosine of ninety degrees is zero, so a force at right angles to the motion does no work at all.

Work is the product of force and displacement, so its unit is the newton metre, which is given the name joule; one joule of work is done when a force of one newton moves a body through one metre in its own direction.

The Desert National Park, spread over sand dunes and open grassland near Jaisalmer and Barmer, is the best known habitat of this tall, heavy ground bird, whose numbers have fallen sharply and which is the state bird of Rajasthan.

In a national park the whole ecosystem is protected, rights are settled before the area is notified, grazing and cultivation are prohibited and the boundary cannot be altered except through a resolution of the state legislature.

It added two categories beyond the national park and the sanctuary: a conservation reserve, usually on state land adjoining a protected area and meant to guard a corridor between habitats, and a community reserve, on private or community land where the people themselves agree to protect wildlife.

Hemis lies in the cold, high altitude desert of Ladakh, covers a very large stretch of mountain terrain, and is the best known habitat of the snow leopard, along with the bharal and the Tibetan wolf.

Silent Valley lies in the Nilgiri hills of Kerala and protects one of the last stretches of undisturbed tropical evergreen forest in the Western Ghats, whose best known resident is the lion-tailed macaque.

Dachigam lies close to Srinagar in Jammu and Kashmir and is the last stronghold of this deer, which moves between the upper and lower parts of the park with the seasons.

Keoladeo Ghana in Rajasthan is a shallow wetland created long ago as a duck shooting reserve of the rulers of Bharatpur, and it now shelters large numbers of resident and migratory birds every winter; it is a World Heritage Site.