RRB Group D 2018 Previous Year GK Questions with Answers

The middle ear holds three tiny bones, the smallest in the human body, called the malleus, the incus and the stapes, which in everyday English are the hammer, the anvil and the stirrup.

Sound is a mechanical wave: it travels only when the particles of a medium push against their neighbours, so the closer and more tightly bound those particles are, the faster the disturbance is passed on.

A unisexual flower carries only one kind of reproductive organ, either stamens or a pistil, while a bisexual flower carries both.

Power is the work done divided by the time taken, and here the work is the potential energy the boy gains while climbing the staircase.

Hexane, C6H14, can be drawn as a straight chain of six carbons, as two chains of five carbons with a methyl branch in different positions, and as two chains of four carbons carrying branches, which gives five different structures with the same molecular formula.

In human beings the sperm meets and fuses with the egg inside the fallopian tube, also called the oviduct. The ovary releases one egg in a month, and the funnel shaped mouth of the fallopian tube collects it.

Hydra, starfish and planaria can all grow a lost or cut off part of the body back into a whole animal, and that ability is called regeneration.

Rajasthan supplies most of India's gypsum and almost all of its silver ore.

Shifting agriculture is called jhoom or jhum cultivation in India, especially in the north eastern hills. In this method a patch of forest is cleared and burnt, and the ash left behind manures the soil.

An ocean thermal energy conversion plant works only where the warm surface water is at least about 20 degrees Celsius hotter than the cold water drawn from the depths.

The Kolar Gold Fields lie in the Kolar district of Karnataka, on the Dharwar rocks of the peninsular plateau. Kolar was for a long time India's main source of gold and one of the deepest mines in the world, going down about three kilometres.

Hydra is the one animal in the list that reproduces both by budding and by regeneration. In budding, a bulge grows out from the body wall of the parent Hydra, develops a mouth and tentacles, and then breaks off as a small independent Hydra.

Collenchyma cells lay down extra cellulose and pectin at the corners of their walls, which makes the tissue strong and yet flexible.

Papaya is raised from seed, so it is not multiplied by vegetative propagation the way the other three plants are.

Green plants give out oxygen only during photosynthesis, the process in which they use light energy to make their own food.

The Toda are a small pastoral people of the upper Nilgiri plateau in Tamil Nadu. They live in hamlets called munds, herd buffaloes and treat dairy work as a sacred duty carried out at the conical or barrel-vaulted temple huts that appear in every photograph of them.

Commemorative coins are issued by the Government of India under the Coinage Act, and the set marking the Nabakalebara of the Jagannath temple was released at a function in Puri in March 2018 by the President.

A ligament is the connective tissue that joins one bone to another at a joint. It is very elastic and strong, and it holds the bones in place so that a joint can move without the bones slipping apart.

Abscisic acid is the one plant hormone in this list that slows growth instead of speeding it up, which is why it is often called the stress hormone of plants.

Testosterone is made by the Leydig cells of the testes and is the main male sex hormone.