RRB Group D 05 Aug All Shift Exam Review Science By Yogesh Sir

RRB Group D 05 Aug All Shift Science Exam Analysis 2026: The Science section in the RRB Group D 05 August 2026 All Shift Exam was largely based on NCERT fundamentals and previous year trends. Questions were asked from Physics, Chemistry, Biology, and Environmental Science, with a balanced mix of theoretical concepts and simple calculations. Candidates who had revised Class 9–10 Science thoroughly found the section easy to moderate.

Below are the important questions and concepts discussed by Yogesh Sir during the exam review.

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Chemistry Questions Asked in RRB Group D 05 Aug Exam

The RRB Group D 5 August 2026 Science section covered questions from Physics, Chemistry, and Biology. Major topics included pH, sound, SI units, force, motion, work & energy, electricity, atomic structure, chemical reactions, tissues, reproduction, decomposers, isotopes, isobars, compounds vs mixtures, and ecology. Most questions were concept-based with a few straightforward numerical problems.

Organic Compounds and Molecular Formula

Several questions were asked from organic chemistry and molecular formulas.

• C₆H₆ is Benzene.

• C₂H₄O represents Acetaldehyde (Ethanal), which contains the aldehyde functional group.

• Molecular formula questions required candidates to calculate the empirical formula first and then determine the actual molecular formula using molecular mass.

• Example:

• Molecular Mass = 60

• Composition:

• Carbon = 40%

• Hydrogen = 6.7%

• Oxygen = 53.3%

• Final Molecular Formula = C₂H₄O₂

pH and Acids

A direct question was asked on pH.

• HCl is a strong acid.

• pH of 0.01 M HCl = 2

• Acidic solutions always have pH less than 7.

Quick Tip:
Remember the concentration of strong acids to solve pH questions quickly.

Chemical Reactions Asked

Important chemistry reactions included:

Hydrogenation Reaction

Ethene reacts with hydrogen in the presence of a nickel catalyst.

Reaction:

C₂H₄ + H₂ → C₂H₆ (Ni Catalyst)

This process is known as Hydrogenation.

Electrolytic Refining of Copper

• Electrolyte used:

• Acidified Copper Sulphate (CuSO₄) Solution

Rust Prevention

The best method to protect iron from rusting in coastal regions is:

• Galvanization (Zinc Coating)

Extraction of Metals

Iron and Zinc are extracted by:

• Reduction using Carbon or Carbon Monoxide

Physics Questions Asked in RRB Group D 05 Aug Exam

SI Unit of Force

The SI unit of force is:

Newton (kg·m/s²)

Derived from Newton's Second Law:

F = ma

Motion and Speed

Uniform Linear Motion

An object moving at:

• Speed = 50 m/s

• Straight line

shows Uniform Linear Motion.

Displacement Question

Formula:

Displacement = Velocity × Time

Example:

• Velocity = 50 m/s

• Time = 10 s

Answer = 500 metres

Average Speed

Example discussed:

• 16 m in 4 s

• 16 m in 2 s

Total Distance = 32 m

Total Time = 6 s

Average Speed =

32 ÷ 6 = 5.33 m/s

Rest Condition

If an object moving at 25 m/s comes to rest in 5 seconds, then

Final Velocity = 0 m/s

Mass vs Weight

A conceptual question was asked.

• Mass remains constant

• Weight changes because gravity varies from place to place.

Work Done

Formula:

Work = Force × Displacement

Given:

• Force = 5 N

• Distance = 50 m

Answer:

250 Joules

Electricity and Magnetism

Parallel Resistance

Six resistors of 3 Ω connected in parallel:

Equivalent Resistance = 0.5 Ω

Magnetic Force on Current-Carrying Wire

Maximum force acts when:

• Wire is perpendicular (90°) to the magnetic field.

Formula:

F = BIL sinθ

Light Questions

Questions were asked from optics.

Twinkling of Stars

Reason:

• Atmospheric Refraction

Concave Mirror

Parallel rays striking a concave mirror meet at the:

• Principal Focus

Prism

The angle between the incident and emergent ray is called:

• Angle of Deviation

Rutherford Atomic Model

Important facts asked:

• Nucleus is positively charged

• Most of the atomic mass lies inside the nucleus.

• Most of the atom is empty space.

• Limitation:

• Could not explain electron stability.

Biology Questions Asked in RRB Group D 05 Aug Exam

Human Reproduction

Questions included:

• An unfertilized egg survives for about 24 hours after ovulation.

• Implantation of the embryo occurs in the uterus.

Sexual Reproduction

Importance:

• Produces genetic variation

• Improves diversity among organisms.

Decomposers

Organisms that break down dead plants and animals are called:

• Decomposers

They recycle nutrients back into the soil.

Human Tissues

Important tissue questions:

Lysosomes

Known as:

• Suicidal Bags of the Cell

Function:

• Digest proteins

• Break down lipids

• Digest carbohydrates

• Destroy damaged cell organelles

Nervous System

Primary function:

• Transmission of electrical impulses throughout the body.

Ecology Questions Asked

Storage Losses in Crops

Two major causes:

• Biotic Factors

• Abiotic Factors

Cross Breeding

Purpose:

• Increase milk production

• Improve disease resistance

• Better immunity

• Higher productivity

Difference Between Food Chain and Food Web

Difference Between Isotopes and Isobars

Difference Between Compounds and Mixtures

Preparation Tips by Yogesh Sir

According to Yogesh Sir, candidates should:

• Complete one chapter thoroughly before moving to the next.

• Solve chapter-wise MCQs immediately after finishing the topic.

• Practice previous year RRB questions regularly.

• Attempt full-length mock tests after syllabus completion.

• Focus on speed, accuracy, and revision of NCERT Class 9–10 Science concepts.

Key Takeaways

The RRB Group D 05 August 2026 Science paper focused on conceptual understanding rather than lengthy calculations. Questions were mainly asked from NCERT-based Physics, Chemistry, and Biology, including pH, force, work & energy, electricity, reproduction, tissues, atomic models, chemical reactions, ecology, and basic numerical problems. Candidates with strong fundamentals and regular practice could attempt this section with high accuracy.