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RRB ALP GK Questions 2026

General Science is the knowledge section of RRB ALP under CEN 01/2026. The CEN defines it as Physics, Chemistry and Life Sciences of Class 10 level in CBT-1, and CBT-2 Part A adds Basic Science and Engineering: units and measurements, mass, weight and density, work, power and energy, speed and velocity, heat and temperature, basic electricity, levers and simple machines, engineering drawing, occupational safety and health, environment education and IT literacy. The notes on this page are GK24's topic-wise GK notes for RRB ALP, written as short facts, formulas and tables so that a topic can be revised in one sitting. Physics notes cover motion, force, gravitation, work and energy, sound, light, electricity and magnetism; Chemistry notes cover matter, atoms and molecules, chemical reactions, acids, bases and salts, metals and non-metals, carbon compounds and the periodic table; Life Sciences notes cover the cell, life processes, control and coordination, reproduction, heredity, diseases and the environment. Topics that appear in both CBT-1 General Science and CBT-2 Basic Science and Engineering, such as units, energy, heat and electricity, are marked so that one reading serves two papers. Each note ends with the previous-year questions asked on it, and the quizzes on this site draw from the same topics, so a weak quiz score points back to the note to reread.

RRB ALP GK Questions with Answers

Q81.General ScienceEasy

Boyle's law states that at constant temperature, the volume of a fixed mass of gas is

  1. A.Directly proportional to its pressure
  2. B.Inversely proportional to its pressure
  3. C.Independent of its pressure
  4. D.Proportional to the square of its pressure
Show answer
Correct answer: B. Inversely proportional to its pressure

Boyle's law, established in 1662, says that for a fixed mass of gas at constant temperature the product of pressure and volume stays constant, so doubling the pressure halves the volume.

Q83.General ScienceAsked in: CDS · CDS-I 2023, GKMedium

Which one of the following is not true for anodizing process?

  1. A.It makes aluminium corrosion resistant.
  2. B.Metals like aluminium, titanium and magnesium can be anodized.
  3. C.Clean aluminium article is the anode and oxygen gas is evolved at the cathode.
  4. D.It is used in aircraft industry.
Show answer
Correct answer: C. Clean aluminium article is the anode and oxygen gas is evolved at the cathode.

In anodizing the clean aluminium article is indeed the anode, but oxygen is released at the anode, not at the cathode; hydrogen is released at the cathode.

Q84.General ScienceAsked in: CDS · CDS-II 2016, GKMedium

Which one of the following statements is not correct?

  1. A.The response of the ear to sound of increasing intensity is approximately logarithmic.
  2. B.The sensitivity of the human ear does not vary with the frequency of the sound.
  3. C.When two or more waves traverse the same medium, the displacement of any element of the medium is the algebraic sum of the displacements due to each wave.
  4. D.Longitudinal waves can travel in all media—solids, liquids and gases.
Show answer
Correct answer: B. The sensitivity of the human ear does not vary with the frequency of the sound.

The statement that the sensitivity of the human ear does not vary with frequency is false, because the ear is far more sensitive to some frequencies than to others.

Q86.General ScienceAsked in: NDA · NDA-I 2022, GATMedium

According to Fleming's right-hand rule, if the forefinger indicates the direction of magnetic field and thumb shows the direction of motion of conductor, then the stretched middle finger will predict

  1. A.force acting on the conductor
  2. B.electric field
  3. C.induced current
  4. D.current
Show answer
Correct answer: C. induced current

Fleming's right-hand rule is used for electromagnetic induction, as in a generator, and its middle finger gives the direction of the current induced in the conductor.

Q87.General ScienceEasy

The centripetal acceleration of a body moving in a circle of radius r with uniform speed v is directed:

  1. A.Along the tangent, in the direction of motion
  2. B.Towards the centre of the circle
  3. C.Away from the centre of the circle
  4. D.Vertically downward
Show answer
Correct answer: B. Towards the centre of the circle

In uniform circular motion the magnitude of the velocity does not change, so the acceleration can have no component along the direction of motion; the whole of it is perpendicular to the velocity and points to the centre, which is why it is called centripetal, meaning centre seeking, and its…

Q88.General ScienceMedium

A cyclist leans inward while taking a turn because:

  1. A.It reduces the weight of the cycle
  2. B.The reaction of the ground then has a horizontal component towards the centre of the turn
  3. C.It increases the rolling friction of the tyres
  4. D.It makes the centrifugal force disappear
Show answer
Correct answer: B. The reaction of the ground then has a horizontal component towards the centre of the turn

To move along a curve a body needs a force directed towards the centre of that curve.

Q89.General ScienceEasy

Ball bearings are used in machines mainly because they:

  1. A.Convert rolling friction into sliding friction
  2. B.Convert sliding friction into rolling friction
  3. C.Remove friction altogether
  4. D.Increase the normal reaction on the shaft
Show answer
Correct answer: B. Convert sliding friction into rolling friction

A shaft turning directly inside a sleeve slides against it, and sliding friction is large; placing hard steel balls between the shaft and its housing makes the surfaces roll over one another instead, and rolling friction is a small fraction of sliding friction, so less energy is wasted and the…

Q90.General ScienceHard

On a frictionless banked road, the angle of banking for a curve of radius r and a speed v is given by the tangent of the angle equal to:

  1. A.v squared divided by r g
  2. B.r g divided by v squared
  3. C.v divided by r g
  4. D.v squared multiplied by r g
Show answer
Correct answer: A. v squared divided by r g

On a banked road the normal reaction is tilted, its vertical component balances the weight and its horizontal component supplies the centripetal force; dividing one equation by the other leaves the tangent of the banking angle equal to the square of the speed divided by the radius multiplied by the…

Q92.General ScienceAsked in: Delhi · 7 Sept 2021, Shift 3Medium

A car travels in a circular motion. Which of the following statements is true?

  1. A.Distance travelled by the car will always be less than displacement of the car.
  2. B.Distance travelled by the car will always be more than displacement of the car.
  3. C.Distance travelled by the car will always be equal to displacement of the car.
  4. D.Distance travelled by the car will be zero when displacement is zero.
Show answer
Correct answer: B. Distance travelled by the car will always be more than displacement of the car.

Distance is the length of the actual path and displacement is the straight line from the start to the finish, so on a curved path the two can never be equal: the arc of a circle is always longer than the chord joining its ends.

Q95.General ScienceEasy

For the same pair of surfaces, which of the following types of friction is the smallest?

  1. A.Static friction
  2. B.Limiting friction
  3. C.Sliding friction
  4. D.Rolling friction
Show answer
Correct answer: D. Rolling friction

When a body rolls, the surfaces in contact change continuously and the irregularities have no time to interlock deeply, so rolling friction is very much smaller than sliding friction; this single fact is the reason the wheel was invented and the reason a ball bearing is fitted wherever a shaft…

Q96.General ScienceMedium

Which of the following statements about the coefficient of friction is correct?

  1. A.It is measured in newton
  2. B.It has no unit and no dimensions
  3. C.It is measured in newton per square metre
  4. D.It is measured in joule
Show answer
Correct answer: B. It has no unit and no dimensions

The coefficient of friction is the ratio of the limiting or kinetic frictional force to the normal reaction, and since both are forces the ratio is a pure number; the same reasoning applies to other ratios such as the refractive index and relative density.

Q99.General ScienceAsked in: NDA · NDA-II 2024, GATHard

Starting from rest a vehicle accelerates at the rate of 2 m/s² towards east for 10 s. It then stops suddenly. It then accelerates again at a rate of 4√2 m/s² for next 10 s towards south and then again comes to rest. The net displacement of the vehicle from the starting point is

  1. A.100 m
  2. B.200 m
  3. C.300 m
  4. D.400 m
Show answer
Correct answer: C. 300 m

The vehicle goes 100 m east and 200√2 m south, and the straight-line distance between start and finish is √(100² + (200√2)²) = 300 m. Each leg starts from rest, so the distance covered is s = ½at².