Railway GK Questions 2026

Kazakhstan is the ninth largest country in the world and by far the largest with no sea coast. Its shore on the Caspian does not change this, because the Caspian is the world's largest lake and has no natural connection with the ocean, so Kazakhstan is counted as landlocked.

A doubly landlocked country is one that is surrounded only by landlocked countries, so at least two international borders must be crossed to reach the sea.

The coastal states of India, counted from the west coast round to the east, are Gujarat, Maharashtra, Goa, Karnataka, Kerala, Tamil Nadu, Andhra Pradesh, Odisha and West Bengal; Gujarat has the longest coastline among them.

If the frequency of the soldiers' rhythmic steps happens to match the natural frequency of the bridge, the bridge is driven at its own frequency and its amplitude of vibration can build up to a dangerous level; breaking step destroys the rhythm and avoids the risk.

The Dutch scientist Huygens designed the first working pendulum clock in 1656, after Galileo had noticed that a swinging lamp took the same time for each swing whether it swung far or little, the property called isochronism.

In simple harmonic motion the acceleration equals minus omega squared times the displacement, so it grows with displacement and is greatest at the ends of the path, where its value is A omega squared and it points back towards the centre.

Potential energy is proportional to the square of the displacement, so it is greatest where the displacement is greatest, that is at the two ends of the path, where the body is momentarily at rest and its kinetic energy is zero.

The time period varies inversely as the square root of g, so if g falls to one sixth, the period is multiplied by the square root of six, about 2.45 times; the pendulum swings more slowly and a pendulum clock taken to the moon would lose time badly.

The time period varies as the square root of the length, so multiplying the length by four multiplies the period by the square root of four, that is by two; to double the period of a pendulum its length must be made four times.

A second's pendulum is one whose time period is exactly two seconds, so that each swing from one side to the other takes one second.

The time period of a simple pendulum is two pi times the square root of the length divided by g, in which the mass of the bob does not appear at all; a heavy bob and a light bob of the same length keep the same time, which is the…

A swing is a pendulum, and its speed is greatest at the lowest point, where all the potential energy gained at the top has turned into kinetic energy.

In simple harmonic motion the velocity is given by omega times the square root of A squared minus x squared.

The English engineer Thomas Savery patented a steam pump in 1698 and called it the Miner's Friend, as it was meant to pump water out of flooded mines.

Each half of the wire has a resistance of 10 Ω, and two 10 Ω resistors in parallel give 5 Ω. The resistance of a wire is R = ρL/A, so it is directly proportional to its length when the material and thickness stay the same.

In myopia, or short-sightedness, a person sees near objects clearly but distant objects look blurred because their image forms in front of the retina.

Two miscible liquids that form a homogeneous mixture are separated by distillation, which uses the difference in their boiling points.

Koradi Thermal Power Station stands at Koradi, a few kilometres north of Nagpur city in Maharashtra. The plant is run by MAHAGENCO, the Maharashtra State Power Generation Company, and burns coal from the mines of the Vidarbha region.

The urinary bladder is a hollow muscular sac made of smooth muscle and a stretchable lining; it has no cartilage.

An electric generator converts mechanical energy into electrical energy and so produces electric current. A generator works on electromagnetic induction, discovered by Michael Faraday in 1831.