Railway GK Questions 2026

Copper in the +1 state is reduced to metal, so it is the oxidant; sulphur of Cu2S is oxidised, so it is the reductant.

The two hemispheres always have opposite seasons, so one hemisphere's summer solstice is the other's winter solstice. On about 21 June the Sun is overhead at the Tropic of Cancer; the northern hemisphere has its longest day and summer begins there, while the southern hemisphere has its shortest day.

The RER is studded with ribosomes, the actual sites where amino acids are joined into proteins. Ribosomes read the message carried by mRNA and link amino acids in the right order.

A medium more concentrated than the cell is hypertonic, so water leaves the cell by osmosis. In osmosis water moves across a selectively permeable membrane from the side with fewer dissolved particles to the side with more.

Aerenchyma is a kind of parenchyma whose cells enclose large air-filled spaces. These air cavities keep aquatic plants such as water hyacinth, lotus and Hydrilla afloat and let oxygen move down to roots and stems that sit in waterlogged soil or under water.

Together the two resins take out every dissolved ion, which leaves demineralised water. In the cation exchange resin (written RH), metal ions such as Ca2+, Mg2+ and Na+ are swapped for H+ ions.

Radiation carries heat as electromagnetic waves, and these waves travel even through empty space. Heat moves in three ways.

This is the incorrect statement, because periodic motion repeats after every interval T, again and again. The time period T of a pendulum is the time for one complete oscillation, that is, the smallest interval after which the bob returns to the same position moving in the same direction.

These are the three places in a eukaryotic cell where DNA is found. The nucleus holds nearly all of a cell's DNA, packed with proteins into chromosomes.

A ribosome contains RNA, but it has no genes of its own; it reads messenger RNA sent from the DNA of the nucleus or an organelle.

A chemical reaction produces only internal forces, which cannot change the motion of the centre of mass but can change internal kinetic energy.

Water is densest at 4 °C, where one cubic metre has a mass of almost exactly 1000 kg.

Lonar Lake in Buldhana district of Maharashtra fills a crater made by a meteorite impact. The Lonar crater was formed in prehistoric times when a meteorite struck the basalt rock of the Deccan Plateau.

Latent heat is absorbed during a change of state while the temperature stays fixed. When water boils at 100 °C, adding more heat does not raise its temperature; the energy goes into breaking the attractions between molecules so that liquid turns into vapour.

The stone takes 2 s to fall 20 m, and in that time it moves 12 × 2 = 24 m sideways.

The heater's resistance is 220/0.5 = 440 Ω, so at 120 V the current is 120/440, about 0.27 A. By Ohm's law, V = IR, and for an ohmic conductor at a steady temperature the resistance stays the same.

Both carry their own DNA and ribosomes and can make some of their own proteins. Mitochondria, the powerhouses of the cell, and plastids such as chloroplasts each contain a small circular DNA molecule and 70S ribosomes, much like bacteria.

It gives the direction of the force on a current-carrying conductor placed in a magnetic field. Stretch the thumb, forefinger and middle finger of the left hand so that they are mutually perpendicular.

Two equal forces give a resultant of the same size only when they are 120° apart, and the resultant then makes 60° with each.

All the potential energy at the top turns into kinetic energy at the mean position, so v = √(2gh) = √(2 × 10 × 0.20) = 2 m/s. When the bob is released from rest at height h, it has potential energy mgh and no kinetic energy.