RRB Group D 2026 Exam Review 17 Aug All Shifts Science By Yogesh Sir

RRB Group D 2026 Exam Review 17 Aug All Shifts Science By Yogesh Sir: The Railway Recruitment Board (RRB) has organised the RRB Group D CBT exam from August 3 to August 26, 2026, on multiple. Candidates who have applied for the Group D posts need to appear for the CBT examination. RRB Group D 2026 Science exam review can help candidates to know the priority topics. Yogesh Sir has organised a YouTube session to guide the candidates regarding the concepts and question practice for the exam. 

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Topics Discussed In RRB Group D Science Exam Review

Yogesh Sir has discussed the important concepts in the RRB Group D Science session. It is for the candidates who will appear for the CBT exam in the upcoming days, as per the dates alloted to them. The last revision can help to review the important topics. 

Science Topics Discussed

• Plant Reproduction

  • Bryophyllum can reproduce through buds that grow on the edges of its leaves.

• Plasma Membrane

  • The plasma membrane is mainly made of lipids and proteins.

  • It does not contain DNA.

• Intermolecular Forces

  • Attractive forces between particles are strongest in solids.

  • Example: particles in an iron rod are strongly held together.

• Electricity and Circuits

  • Two resistors of 15 Ω and 5 Ω in series have a total resistance of 20 Ω.

  • With a 12 V battery, the current is 0.6 A.

  • Ohm's Law: V = IR.

• Concave Mirror

  • At the centre of curvature, the image is formed at the same point.

  • The image is real, inverted and the same size.

  • When the object is at infinity, the image is real, inverted and highly diminished.

• Reproduction in Plants

  • Damage to the stigma affects pollination and fertilization.

• Bacterial Diseases

  • Gonorrhea and syphilis are bacterial sexually transmitted diseases.

• Washing Soda

  • Washing soda helps to soften hard water.

  • It makes washing clothes easier.

• Magnetic Field

  • Magnetic field lines never cross or intersect each other.

• Electrical Conductivity

  • Glucose and alcohol do not conduct electricity well because they do not form ions in solution.

• Newton's Third Law

  • Every action has an equal and opposite reaction.

  • Examples include a rocket taking off, gun recoil and a horse pulling a cart.

• Diffusion

  • Diffusion is faster at higher temperatures.

  • Gases show diffusion easily.

• Plastids

  • Plastids are found in plant cells.

  • They are not found in animal cells.

• Chemical Symbols

  • The chemical symbol of phosphorus is P.

  • Common symbols include Cu, Au, Ag, Si, Ca, Mg, O, N and C.

• Motion and Acceleration

  • A car moving from 0 to 72 km/h in 20 seconds has an acceleration of 1 m/s².

  • If an object changes speed from 5 m/s to 15 m/s at 2 m/s², the time taken is 5 seconds.

  • If a cyclist starts from rest and reaches 5 m/s in 25 seconds, acceleration is 0.2 m/s².

• Force and Mass

  • Newton's Second Law is F = ma.

  • Force depends on mass and acceleration.

• Gravitation

  • Earth's gravity causes objects to fall towards the Earth.

  • Gravity also affects the motion of planets and other celestial bodies.

• Blue Sky

  • The sky appears blue because sunlight is scattered by particles and molecules in the atmosphere.

• Displacement Reaction

  • Iron placed in copper sulfate solution causes a displacement reaction.

  • The blue solution becomes lighter.

  • A reddish-brown layer of copper forms on the iron nail.

• Insect Damage to Plants

  • Some insects suck cell sap from plants.

  • This can cause loss of nutrients and damage to the plant.

• Power

  • Power is the rate of doing work or transferring energy.

  • More work done in less time means greater power.

• Resistance

  • Using V = IR, a 6 V battery and 2 A current give a resistance of 3 Ω.

• Work Done

  • Work depends on force, displacement and the angle between them.

  • Formula: W = Fd cos θ.

• Acid Safety

  • Water should be added carefully to concentrated acid.

  • Mixing can produce heat and cause splashes or fumes.

• Cell Division

  • Cell division helps in growth, repair and replacement of old cells.

• Ore Concentration

  • Ore concentration removes unwanted impurities called gangue.

  • It increases the amount of useful mineral in the ore.

• Human Reproduction

  • Fertilisation usually takes place in the fallopian tube.

  • The embryo later gets implanted in the uterus.

• Oral Care After Vomiting

  • The mouth should be cleaned after vomiting.

  • This helps protect teeth from stomach acid.

• Decomposition Reaction

  • A decomposition reaction occurs when one compound breaks into two or more simpler substances.

• Circular Motion

  • Speed in circular motion can be calculated using V = 2πr/t.

• Weight on the Moon

  • An object weighs about one-sixth as much on the Moon as on Earth.

  • An object weighing 60 N on Earth weighs about 10 N on the Moon.

  • Mass remains the same.

• Sexual Reproduction

  • Offspring receive DNA from both parents.

  • This creates genetic variation.

• Homologous Series

  • A homologous series contains compounds with similar chemical properties.

  • Each next member differs by CH₂.

  • Methane, ethane and propane are examples of alkanes.

• Electrical Power

  • A resistor with 4 Ω resistance producing 64 J/s has a power of 64 W.

  • Current is 4 A.

  • Potential difference is 16 V.

• Heating of Solids

  • A solid changes into a liquid when it melts.

  • With further heating, the liquid changes into a gas through vaporization.

• Sound Propagation

  • Sound needs a medium to travel.

  • Sound can travel through solids, liquids and gases.

  • Sound cannot travel through a vacuum.

RRB Group D 2026 Science Questions Asked

Candidates can review and solve the problems from the Science subject. It can help them memorise the important concepts before facing the actual exam. 

• Is the offspring a combination of the DNA of both parents?

• Which of the following is a homologous series?

• Find the potential difference across a circuit with 4 Ω resistance and 64 J/s of heat.

• What happens when a solid is heated continuously?

• Which statement is correct about the propagation of sound?

• What is a homologous series?

• What are single, double and triple chemical bonds?

• What is the difference between saturated and unsaturated hydrocarbons?

• What are methane, ethane and propane?

• How are current and potential difference calculated using H = I²Rt and V = IR?

• What happens to a solid during continuous heating?

• What are melting and vaporisation?

• What medium is needed for sound to travel?

RRB Group D 2026 Science Revision Strategy

RRB Group D 2026 Science preparation should focus on basic concepts from Physics, Chemistry and Biology. Regular revision and question practice can help improve accuracy and confidence.

• Revise important Physics, Chemistry and Biology topics.

• Focus on Class 10 level Science concepts.

• Make short notes of important facts, formulas and definitions.

• Practice previous year questions regularly.

• Solve Science mock tests to improve speed.

• Revise difficult topics more than once.

• Focus on common topics like electricity, heat, acids and bases, metals, human body and diseases.

• Review mistakes after every practice test.

• Keep the last few days for quick revision and formula practice.