RRB Group D GK Questions 2026

In a class 3 lever the effort is applied between the fulcrum and the load, so the effort always sits nearer the fulcrum and its arm is the shorter of the two.

For resistors in parallel the reciprocals add, so one over R equals one over 20 plus one over 20, which is 2 over 20, and R comes out as 10 ohms.

The velocity ratio of a pulley system is the distance moved by the effort divided by the distance moved by the load, so it is 12 divided by 3, that is 4.

Pliers and scissors are each made of two arms joined at one rivet, and each arm is a complete class 1 lever, so the tool is called a double lever.

First find the throwing speed from the height: v squared equals u squared minus 2 g h gives u equal to the square root of 2 into 10 into 80, that is 40 metres per second.

Put the values straight into s equal to u t minus half g t squared, taking upward as positive: 30 into 4 gives 120, half of 10 into 16 gives 80, and the difference is 40 metres.

By the work-energy theorem the work done by a force equals the change in kinetic energy, so the work here is half of 4 kilograms times 5 metres per second squared, that is 0.5 into 4 into 25, which gives 50 joules.

Work done is force multiplied by the displacement along the force, so F equals the work divided by the distance, that is 480 joules divided by 15 metres, which gives 32 newtons.

A convex mirror bulges towards the viewer and always gives a virtual, erect and diminished image, so whatever your distance from it, your reflection looks smaller than you.

Pisciculture is the rearing of fish in ponds, tanks and other managed waters, the Latin word piscis meaning fish.

Protein synthesis begins with transcription, in which the message of a gene is copied from DNA into messenger RNA, so the first event is the making of an mRNA copy.

An ordinary filament bulb is filled with a mixture of argon and nitrogen because both are chemically unreactive and will not burn the white-hot tungsten filament.

Bronze is an alloy of copper and tin, usually about 88 per cent copper to 12 per cent tin. Tin makes copper harder and gives it a far better resistance to rust and sea water, which is why bronze is used for statues, temple bells, coins, medals and ship fittings.

Reduction means the loss of oxygen or the gain of hydrogen, so each statement states one half of the same definition.

Himachal Pradesh lies west of the Nepal border, so it touches China in the north but never Nepal. Five Indian states share a boundary with Nepal - Uttarakhand, Uttar Pradesh, Bihar, West Bengal and Sikkim - and the border runs for about 1,751 kilometres.

The Rail Coach Factory, which carries exactly that name, was set up at Kapurthala in Punjab in 1986 and builds passenger coaches, among them the LHB coaches now standard on long-distance trains.

Young fold mountains were raised in the Tertiary period, only a few tens of millions of years ago in geological time, so erosion has had little time to wear them down and many of them are still rising as the plates behind them keep pushing.

Carbon monoxide is a dangerous air pollutant, but it is not counted among the major greenhouse gases, because it absorbs very little of the infrared heat leaving the earth.

Razia Sultan was the daughter of Iltutmish, and Iltutmish belonged to the Slave dynasty, also called the Mamluk dynasty or the Ilbari Turks.

The focal length of a mirror does not depend on the medium around it, so a convex mirror of focal length f in air keeps the focal length f inside the liquid.