RRB Group D 06 August All Shift Exam Review Science By Yogesh Sir

The RRB Group D 06 August 2026 Science Exam Review by Yogesh Sir provides a detailed overview of the questions and concepts asked across all shifts. The Science section covered important topics from Physics, Chemistry, and Biology, with questions based largely on fundamental concepts, formulas, NCERT-level facts, and numerical applications.

Candidates can use this analysis to understand the difficulty level, important topics, and frequently tested concepts from the RRB Group D Science section. The questions discussed below include topics such as Ohm’s Law, sound, gravitation, kinetic and potential energy, electronic configuration, isotopes, chemical reactions, plant tissues, human reproduction, cell structure, and more.

Also Read: 

• RRB Group D Admit Card 2026 Out

• RRB Group D City Intimation Slip 2026

RRB Group D 06 August Science Exam Review: Key Highlights

The RRB Group D 06 August Science section covered important concepts from Physics, Chemistry, and Biology. The key topics and concepts asked across different shifts are highlighted below for quick revision and exam analysis. 

Physics Questions and Concepts

Speed of Sound

The speed of sound depends on the properties and temperature of the medium. In general, the speed of sound increases as temperature increases.

Sound travels fastest through solids, followed by liquids, and slowest through gases. Therefore, sound travels much faster through materials such as iron than through air.

Ohm’s Law and Series Combination of Resistors

Suppose two resistors of 5 Ω and 15 Ω are connected in series with a 10 V battery.

For resistors connected in series:

Equivalent resistance = R₁ + R₂

= 5 + 15
= 20 Ω

According to Ohm’s Law:

V = IR

Therefore,

I = V/R = 10/20 = 0.5 A

Hence, the current flowing through the circuit is 0.5 Ampere.

Universal Law of Gravitation

Newton’s Universal Law of Gravitation explains several natural phenomena, including:

• Falling of objects towards Earth

• Weight of objects

• Motion of celestial bodies

• Tides caused by the gravitational attraction of the Moon and Sun

However, air resistance is not explained by the Universal Law of Gravitation. Air resistance is a type of frictional force.

Displacement in Circular Motion

A farmer completes one round of an 11-metre square field in 20 seconds. If he walks continuously for 3 minutes 20 seconds, the total time is:

3 minutes 20 seconds = 200 seconds

Number of rounds:

200 ÷ 20 = 10 rounds

After completing 10 complete rounds, he returns to his starting point. Therefore:

Displacement = 0 metre

The total distance travelled, however, would not be zero.

Refractive Index

If the speed of light in a medium is 2.25 × 10⁸ m/s, its refractive index can be calculated using:

n = c/v

Where:

• c = 3 × 10⁸ m/s

• v = 2.25 × 10⁸ m/s

Therefore:

n = (3 × 10⁸)/(2.25 × 10⁸) = 1.33

Hence, the refractive index is approximately 1.33.

Resistance of a Stretched Wire

A wire has an initial resistance of 10 Ω and is stretched to three times its original length while its volume remains constant.

For a wire of constant volume:

R ∝ L²

If the length becomes 3 times:

R' = R × 3²

= 10 × 9
= 90 Ω

Therefore, the new resistance is 90 Ω.

Kinetic Energy

For an object having a mass of 12 kg and speed of 8 m/s:

KE = ½mv²

= ½ × 12 × 8²
= 6 × 64
= 384 J

Therefore, the kinetic energy is 384 Joules.

Correction of Myopia

Myopia, or short-sightedness, is corrected using a concave lens.

If the far point of a myopic person is 80 cm, then:

f = -0.8 m

Using:

P = 1/f

P = 1/(-0.8)

= -1.25 D

Therefore, the required lens has a power of -1.25 Dioptres.

Uniform Circular Motion

In uniform circular motion, an object moves along a circular path with constant speed. However, its velocity continuously changes because its direction changes at every point.

The changing velocity produces acceleration.

The motion of the Moon around the Earth is a common example of approximately circular orbital motion.

Work Done

If a force of 21 N moves an object through 3 m in the direction of the force:

W = F × s

= 21 × 3
= 63 J

Hence, the work done is 63 Joules.

Potential Energy

For an object of mass 15 kg placed at a height of 8 m, taking g = 9.8 m/s²:

PE = mgh

= 15 × 9.8 × 8
= 1176 J

Therefore, the potential energy is 1176 Joules.

Work Done in an Electric Field

If a charge of 3 C moves through a potential difference of 15 V:

W = VQ

= 15 × 3
= 45 J

Therefore, the work done is 45 Joules.

Principal Focus of a Concave Mirror

The principal focus of a concave mirror is the point on its principal axis where rays parallel to the principal axis converge after reflection.

Chemistry Questions and Concepts

Electronic Configuration of Elements

The electronic configurations of some commonly asked elements are:

Substitution Reaction

A substitution reaction is a chemical reaction in which one atom or group of atoms in a molecule is replaced by another atom or group.

A common example is the reaction of methane with chlorine.

Methane Chlorination

Chlorination of methane is a free-radical substitution reaction. It requires ultraviolet light or sunlight to initiate the reaction.

The reaction can be represented as:

CH₄ + Cl₂ → CH₃Cl + HCl

in the presence of UV light.

Isotopes

Isotopes are atoms of the same element having the same atomic number but different mass numbers due to different numbers of neutrons.

Hydrogen has three important isotopes:

Isotope Used in Cancer Treatment

Cobalt-60 is widely used as a radioactive source in radiotherapy for cancer treatment.

Extraction of Highly Reactive Metals

Highly reactive metals such as sodium, potassium, calcium, and aluminium cannot generally be extracted from their compounds using ordinary reducing agents.

They are extracted using electrolytic reduction.

Roasting of Sulphide Ores

Roasting involves heating a sulphide ore in the presence of excess air or oxygen. This converts the sulphide into an oxide, which can subsequently be reduced to obtain the metal.

Roasting is commonly associated with the extraction of metals such as copper and zinc from sulphide ores.

Molecular Mass of Water

For H₂O:

• Hydrogen = 1 u

• Oxygen = 16 u

Therefore:

Molecular mass = 2(1) + 16 = 18 u

Hence, the molecular mass of water is 18 u.

Total Number of Atoms in Molecules

Consider:

H₂SO₄

= 2 H + 1 S + 4 O
= 7 atoms

N₂O₅

= 2 N + 5 O
= 7 atoms

Therefore, H₂SO₄ and N₂O₅ contain the same total number of atoms per molecule.

Corrosion Near Coastal Areas

Iron objects generally corrode faster in areas near the sea because of high moisture and dissolved salts.

Moisture supports the corrosion process, while salts increase the electrical conductivity of the water layer on the metal surface, accelerating corrosion.

Reactivity Series and Displacement Reactions

A more reactive metal can displace a less reactive metal from its salt solution.

Therefore, if metal A displaces metal B, then:

A must be more reactive than B.

This principle is based on the reactivity series of metals.

Biology Questions and Concepts

Parenchyma Tissue

Parenchyma consists mainly of living, thin-walled plant cells. Its major functions include:

• Storage of food

• Storage of water

• Photosynthesis in certain specialized forms

• Secretion and other metabolic activities

Chlorenchyma and Aerenchyma

Aerenchyma is particularly common in aquatic plants.

Human Embryonic Development

After fertilization, the embryo undergoes development primarily inside the uterus.

The uterus provides the environment and support required for the developing embryo and later the foetus.

Pollen Tube

The pollen tube grows from a germinating pollen grain and helps transport the male gametes towards the ovule.

It plays an important role in fertilization in flowering plants.

Osmosis in Plant and Animal Cells

When cells are placed in pure water, water enters the cells through osmosis.

Animal cells can swell and eventually burst because they lack a rigid cell wall. Plant cells, on the other hand, possess a rigid cell wall, which provides structural support and prevents them from bursting easily.

Mitochondrial Cristae

The inner membrane of mitochondria is folded into structures called cristae.

Cristae increase the surface area available for proteins and enzyme systems involved in cellular respiration and ATP production, thereby supporting efficient energy generation.

Ligaments and Tendons

Muscular Tissue

Muscular tissue is specialized for contraction and relaxation. It helps produce movement of the body and movement of various internal organs.

Vegetative Propagation

Vegetative propagation is an asexual method of plant reproduction in which new plants develop from vegetative parts such as roots, stems, or leaves.

Its major advantages include:

• Rapid multiplication

• Production of genetically similar plants

• Preservation of desirable characteristics

• Useful for commercially important crops

RRB Group D Science Rapid Fire Questions

Which isotope is used in cancer treatment?

Cobalt-60 is widely used in radiotherapy.

Which element exists as a diatomic molecule?

Hydrogen (H₂) is a diatomic element.

What is the H⁺ concentration of pure water at 25°C?

The H⁺ concentration is approximately 1 × 10⁻⁷ mol/L.

Which tissue connects bone to bone?

Ligament connects bone to bone.

Which tissue connects muscle to bone?

Tendon connects muscle to bone.

Which lens is used to correct myopia?

A concave lens is used to correct myopia.

What happens to velocity in uniform circular motion?

Velocity continuously changes because the direction of motion changes, even though speed remains constant.

What is the SI unit of work?

The SI unit of work is the Joule (J).

What is the principal focus of a concave mirror?

It is the point on the principal axis where parallel rays of light converge after reflection.

RRB Group D 06 August Science Exam Review: Important Takeaways

The Science questions in the RRB Group D 06 August 2026 all-shift exam covered a broad range of fundamental concepts. Physics questions included motion, electricity, optics, work, energy, and gravitation, while Chemistry focused on reactions, isotopes, electronic configuration, metal extraction, and corrosion.

Biology questions primarily tested concepts related to plant tissues, reproduction, cells, human development, and connective tissues. Candidates preparing for upcoming RRB Group D shifts should revise NCERT Science concepts, important formulas, definitions, and previous-year questions for better performance.