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RRB Group D GK Questions 2026

Static GK is not a separate section in RRB Group D, but it decides most of the paper's recall marks. General Science is 25 questions of Physics, Chemistry and Life Sciences at 10th standard (CBSE) level as per CEN 09/2025, and the 20 General Awareness questions lean on the standing facts behind the news: the sport, the award, the institution, the state, the river or the scientist an event touches. This page holds GK24's topic-wise GK notes for RRB Group D. The General Science notes go topic by topic through motion and force, work, energy and power, gravitation, heat, light, sound, electricity and magnetism, atomic structure and the periodic table, chemical reactions, acids, bases and salts, metals and non-metals, and carbon compounds, and the Life Sciences notes cover cells, the human body, nutrition, diseases, plants and genetics. The static GK notes cover Indian Railways zones and facts, national symbols, first and largest in India and the world, awards and honours, important days, books and authors, sports GK, art and culture, and the basics of Indian Polity, Geography, History and the Economy. Each note is short facts and tables that can be revised in one sitting. Read a note, then solve its quiz and the previous-year questions on this site to check what stayed.

RRB Group D GK Questions with Answers

Q701.General ScienceAsked in: NDA · NDA-I 2021, GATMedium

Which one of the following conclusions could not be derived from Rutherford's α-particle scattering experiment?

  1. A.Most of the space in the atom is empty.
  2. B.The radius of the atom is about 10⁵ times the radius of the nucleus.
  3. C.Electrons move in a circular path of fixed energy called orbits.
  4. D.Nearly all the mass of the atom resides in the nucleus.
Show answer
Correct answer: C. Electrons move in a circular path of fixed energy called orbits.

. Orbits of fixed energy were proposed by Niels Bohr in 1913; Rutherford's experiment said nothing about the energy of electrons.

Q706.General ScienceAsked in: NDA · NDA-II 2026, GATMedium

Which of the following statements is/are correct in respect of Portland cement ? I. Adding more water (higher water-cement ratio) accelerates the initial setting time of cement. II. The addition of a small percentage of gypsum gives the desired retardation. III. Gypsum is added during manufacturing to accelerate the setting time of cement. Select the answer using the code given below :

  1. A.I and II
  2. B.I and III
  3. C.I only
  4. D.II only
Show answer
Correct answer: D. II only

Only statement II is correct: a small amount of gypsum is added to cement to slow down its setting. Portland cement is made by heating limestone and clay to form clinker, which is then ground with about 2 to 3 per cent gypsum (calcium sulphate dihydrate).

Q707.General ScienceAsked in: NDA · NDA-I 2018, GATMedium

Which one of the following properties is NOT true for graphite ?

  1. A.Hybridisation of each carbon atom is sp³
  2. B.Hybridisation of each carbon atom is sp²
  3. C.Electrons are delocalized over the whole sheet of atoms
  4. D.Each layer is composed of hexagonal rings
Show answer
Correct answer: A. Hybridisation of each carbon atom is sp³

In graphite each carbon atom is sp² hybridised, not sp³, so statement A is the one that is not true.

Q711.General ScienceAsked in: NDA · NDA-I 2022, GATEasy

Which one of the following reactions is an example of decomposition reaction?

  1. A.CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g)
  2. B.2AgCl(s) → (sunlight) 2Ag(s) + Cl₂(g)
  3. C.CuO + H₂ → (heat) Cu + H₂O
  4. D.Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s)
Show answer
Correct answer: B. 2AgCl(s) → (sunlight) 2Ag(s) + Cl₂(g)

A single compound, silver chloride, breaks down into two simpler substances, silver and chlorine, which is exactly what a decomposition reaction is.

Q712.General ScienceAsked in: NDA · NDA-II 2023, GATEasy

What is the action of litmus on ethanol ?

  1. A.Litmus is neutral towards ethanol
  2. B.Ethanol turns blue litmus to red; confirming acidic nature of ethanol
  3. C.Ethanol turns red litmus to blue; confirming basic nature of ethanol
  4. D.Ethanol decolorizes litmus through bleaching action
Show answer
Correct answer: A. Litmus is neutral towards ethanol

Ethanol does not change the colour of either red or blue litmus, because it is neutral. Ethanol, C₂H₅OH, is an alcohol.

Q715.General ScienceAsked in: NDA · NDA-II 2026, GATEasy

Ionic compounds have high melting and boiling points. This is due to :

  1. A.the presence of strong electrostatic forces between ions in the crystal lattice.
  2. B.the weak intermolecular van der Waals forces.
  3. C.the presence of a 'sea of delocalized electrons'.
  4. D.lower lattice energy.
Show answer
Correct answer: A. the presence of strong electrostatic forces between ions in the crystal lattice.

. Oppositely charged ions in an ionic crystal pull on each other strongly from every side, so a great deal of heat is needed to break the lattice apart.

Q716.General ScienceAsked in: UPSC CAPF · CAPF 2025, Paper IEasy

The potential difference between the terminals of an electrical heating device is 40 V, when it draws a current of 2 A from the source. Which one of the following is the correct value of current drawn by the heating device if the potential is increased to 140 V?

  1. A.7 A
  2. B.5 A
  3. C.4 A
  4. D.2 A
Show answer
Correct answer: A. 7 A

By Ohm's law the heater's resistance is 40 V divided by 2 A, which is 20 ohms, so at 140 V it draws 140 divided by 20, or 7 A. Ohm's law states that, at constant temperature, the current through a conductor is directly proportional to the potential difference across…

Q717.General ScienceAsked in: UPSC CAPF · CAPF 2025, Paper IMedium

Which one among the following statements related to human eye is correct?

  1. A.For a person suffering from short-sight defect, the image of a distant object is focused behind the retina.
  2. B.Short-sight defect can be corrected by a converging spectacle lens.
  3. C.For a person suffering from long-sight defect, the image of a near object is focused behind the retina.
  4. D.Long-sight defect can be corrected by a diverging spectacle lens.
Show answer
Correct answer: C. For a person suffering from long-sight defect, the image of a near object is focused behind the retina.

In long-sightedness (hypermetropia) the eye cannot see nearby objects clearly because their image is formed behind the retina.

Q719.Environment & EcologyAsked in: UPSC CAPF · CAPF 2017, Paper IEasy

Which one of the following is NOT decomposed by bacterial action ?

  1. A.Vegetable remains
  2. B.Plastic materials
  3. C.Animal carcasses
  4. D.Wastes of flowers
Show answer
Correct answer: B. Plastic materials

Ordinary plastics are non-biodegradable, so bacteria and fungi cannot break them down in any useful length of time. Most plastics, such as polyethylene, polypropylene and PVC, are long synthetic polymers made from petroleum.

Q720.GeographyEasy

In shifting cultivation, the ash of the burnt vegetation serves mainly as

  1. A.A pesticide
  2. B.A manure that supplies nutrients to the soil
  3. C.A weedicide that kills the forest roots
  4. D.A means of levelling the slope
Show answer
Correct answer: B. A manure that supplies nutrients to the soil

In slash-and-burn farming the felled trees and undergrowth are dried and burnt on the spot, and the ash left behind is rich in potash and other mineral nutrients, which the cultivator depends on because no chemical fertiliser or farmyard manure is used.