RRB Group D 2025 Previous Year GK Questions with Answers

The correct answer is B, Iron rod. An iron rod is a solid, and the force of attraction between particles is strongest in the solid state.

In a solid the particles sit close together in fixed positions and can only vibrate, so a solid keeps its shape, has a definite volume and can hardly be compressed. In a liquid the attraction is weaker, so the particles slide over one another and the liquid takes the shape of its vessel while keeping its volume. In a gas the attraction is weakest and the particles move freely at high speed, so a gas fills any container and is easily compressed. The same order explains why solids have the highest density and gases the lowest.

Option A is wrong because water is a liquid with medium attraction. Option C is wrong because alcohol is also a liquid, and it evaporates faster than water. Option D is wrong because oxygen is a gas, where the attraction between particles is the weakest of all.

Exam tip: force of attraction is solid greater than liquid greater than gas, and the freedom of particles runs the other way.

The correct answer is C, Breaking a chalk stick. Force has to be applied to break the chalk because its particles hold one another together, and that pull is the force of attraction between particles.

Every substance is made of particles that attract one another, and the strength of that attraction decides how hard a thing is to break. The attraction is strongest in solids, less in liquids and least in gases, which is why an iron rod needs a hammer, water can be separated with a finger and air offers no resistance at all. The school activity of breaking chalk, then a pencil and then an iron nail shows the difference in this force from one solid to another.

Option A is wrong because compressing a sponge only squeezes out the air in its pores. Option B is wrong because dissolving sugar shows diffusion and the spaces between particles. Option D is wrong because heating ice shows a change of state, not the attraction itself.

Exam tip: attraction between particles is strongest in solids, weaker in liquids and weakest in gases.

The correct answer is C, Tim Wigmore. Test Cricket: A History, published in 2025, was written by the English cricket writer and journalist Tim Wigmore. The book follows the game's longest format from the first Test between England and Australia at Melbourne in March 1877 down to the present day, covering how Test cricket spread across countries, how it changed from era to era, and the pressure it now faces from the shorter formats. Wigmore also co-wrote Cricket 2.0, a study of Twenty20 cricket that was named Wisden Book of the Year. A is wrong because Michael Atherton, the former England captain, writes widely on cricket but not this book. B is wrong because Gideon Haigh is an Australian cricket historian with many other titles to his name. D is wrong because Ramachandra Guha wrote A Corner of a Foreign Field and other works on Indian cricket and history. Exam tip: Tim Wigmore - Test Cricket: A History in 2025 and Cricket 2.0 on Twenty20 cricket.