Okay, here is a summary of the science questions discussed in the provided Hindi transcript, listed roughly in the order they appear. The speaker goes through questions from various shifts of the RRB Technician Grade 3 exam (primarily from Dec 20th, 23rd, 24th, and 26th, 2024, covering multiple time slots).
Many questions seem directly based on NCERT concepts (Class 9 & 10 primarily). Numerical problems are frequent, especially in Physics (Motion, Work/Energy, Electricity). Biology questions cover a wide range, including plant hormones, human systems, reproduction, and ecology. Chemistry includes reaction types, atomic structure basics, periodic trends, and some organic nomenclature/reactions. Several questions were identified by the speaker as potentially having incorrect official answers ("Challenge Questions").
Correct Pair: Rate of change of velocity (Answer: Acceleration).Protozoa & Fission: Which protozoa shows specific fission methods (Context points to Amoeba).Reaction Type: KBr + BaI2 reaction (Answer: Double Displacement).Fertilization Needs: Essential reproductive parts for fertilization (Answer: Pollen & Ovule).Inertia: Why a passenger falls backward when a bus starts suddenly (Answer: Inertia of Rest).Cooling Effect: Why sweating cools the body (Answer: Evaporation absorbs heat).Hormone Regulation: What stimulates pituitary to release Growth Hormone (GH) when GH is low (Answer: Hypothalamus via GHRF).Electrolytic Refining: Where impurities settle (Answer: Anode Mud).Digestion Path: Correct sequence of food movement in the digestive tract.Connective Tissue: Identify which is NOT a connective tissue (Answer: Tracheid).Soap Action: Hydrophilic end of soap interacts with...? (Answer: Water).Ecosystem Components: Correct statement about biotic/abiotic components (Example: Minerals are abiotic).Separation Technique: Method to separate colloidal particles (Answer: Centrifugation).Force Concepts: Correct statements about Weight vs. Thrust.Growth Hormone Function: Primary role of Growth Hormone.Cell Organelles: Powerhouse of the cell (Answer: Mitochondria).Particle Physics: Doubly charged Helium ions are called...? (Answer: Alpha particles).Electrolytic Refining: Cathode material (Answer: Pure Metal).Cell Transport: Organelle serving as transport pathway and manufacturing surface (Answer: Endoplasmic Reticulum).Ovary Function: Function controlled by ovaries (Answer: Menstrual Cycle).Osmosis in Plants: Process of cell content shrinking away from cell wall due to water loss (Answer: Plasmolysis).Atomic Model: Location of most mass according to Rutherford (Answer: Nucleus).Solenoid Field: Incorrect statement about the magnetic field of a solenoid.Uniform Magnetic Field: How is it represented (Answer: Parallel, equidistant lines).Prism Geometry: Angle between two lateral surfaces of a triangular prism.Kinematics (Numerical): Velocity after 20s for car starting from rest with 0.5 m/s² acceleration (Answer: 10 m/s).Motion Type: Motion of a car increasing speed unequally in equal times (Answer: Non-uniform acceleration).Buoyancy: Upward force by water on an object.Atmospheric Refraction: Cause of advanced sunrise/delayed sunset.Indicators: Olfactory indicator example (Answer: Vanilla/Clove/Onion).Trophic Levels: Correct statement about trophic levels (Example: Producers are 1st level).Chemical Formula: Meaning of subscript in a formula (Answer: Number of atoms).Plant Tissue: Tissue providing flexibility (Answer: Collenchyma).Ozone Depletion: Chemical responsible for ozone depletion in 1980s (Answer: CFCs).Colloid Type: Example of a 'sol' (Solid in Liquid).States of Matter: Characteristic property of liquids (Answer: Definite volume, indefinite shape).Suspensions: Example of a suspension (Answer: Chalk powder in water).Circuits (Numerical): Equivalent resistance and current for 2Ω, 3Ω, 6Ω in parallel with 10V (Answer: 1Ω, 10A).Cell Organelles: Double-membraned organelle directing cell processes (Answer: Nucleus).Brain Function: Main thinking part of the brain (Answer: Forebrain/Cerebrum).Asexual Reproduction: Organism using regeneration for budding (Answer: Hydra).Circular Motion: Example of uniform circular motion (Answer: Satellite orbit).Current (Numerical): Current if 1200C flows in 2 min (Answer: 10A).Chemical Formula: Formula of Washing Soda (Answer: Na2CO3·10H2O).Biodegradability: Example of non-biodegradable substance harming ecosystems (Answer: Plastic).Reactivity Series: Metal found free/native in crust (Answer: Gold/Platinum).Reactivity Series: Metal pair found in native state (Answer: Gold & Platinum).Evaporation: Effect of surface area on evaporation rate (Answer: Increases).Velocity: Average velocity formula (Answer: (U+V)/2).Tissues: If blood is connective, what is bone? (Answer: Connective tissue).Atomic Discoveries: Discoverer of the nucleus (Answer: Rutherford).Elements: Physical state of Bromine (Answer: Liquid).Optics History: First to use a prism to get spectrum (Answer: Newton).Atomic Model: Proposer of the planetary model with discrete energy levels (Answer: Bohr).Atomic Mass Unit: Unit for atomic mass (Answer: amu).Challenge Question (Optics): Incorrect statement about principal focus of spherical mirrors.Power (Numerical): Power of machine doing 500J in 4s (Answer: 125W).Asexual Reproduction: Organism commonly undergoing fragmentation (Answer: Spirogyra).Nervous System: Receptors in sense organs detect...?Ecology: Consequence of large-scale making of clay cups (Kulhads) (Answer: Topsoil loss).Plant Reproduction: Part developing into fruit (Answer: Ovary).Plant Transport: Process aiding water transport from roots (Answer: Transpiration pull).Chemical Reactions: Solid precipitate in Na2SO4 + BaCl2 reaction (Answer: BaSO4).Digestion: Function of villi in small intestine (Answer: Increase surface area).Reactivity Series: Metal reacting only with steam (Answer: Al/Zn/Fe).Tissues: Tissue responsible for movement via contraction (Answer: Muscle).Excretory System: Structure connecting kidney to bladder (Answer: Ureter).Lens Properties: Sign convention for focal lengths of convex/concave lenses.Mirrors: Image characteristics for object between F and P of concave mirror.Redox Reactions: Which is NOT an oxidation reaction example.Isotopes: Number of natural isotopes of Hydrogen (Answer: 3).Kinematics: Equation relating distance, speed, time at zero acceleration.Kinematics (Numerical): Max height for object thrown up at 10 m/s (Answer: 5m).Definitions: Smallest particle of element retaining properties (Answer: Atom).Lens Combinations (Numerical): Combined power of +2.5D and -1.5D lenses (Answer: +1.0D).Plant Reproduction: Female reproductive part of flower (Answer: Pistil/Carpel).Challenge Question (Magnetism): Incorrect statement about magnetic field lines (re: Fleming's rule).Plant Tissue: Dead tissue in coconut husk (Answer: Sclerenchyma).Electricity (Numerical): Number of electrons for 1A current in 8 min (Answer: 3 x 10^21).Digestion: Secretions of gastric glands (Answer: HCl, Pepsin).States of Matter: Correct statement about solids (Answer: Definite shape/volume).Challenge Question (Units): Value of 1 kWh in Joules (Potential answer key error reported).Organic Chemistry: Reaction type of Chlorine with Alkanes (Answer: Substitution).Reactivity Series: Most reactive metal among options (Answer: Potassium).Chemical Reactions: Products of heating Ferrous Sulphate (Answer: Fe2O3, SO2, SO3).Fungi: Common name for Rhizopus (Answer: Bread mould).Mixtures: Example of a mixture (Answer: Air).Ecology: Correct statement about non-biodegradable substances (Answer: Harmful).Nervous System: Cell transmitting information via impulses (Answer: Neuron).Plant Tissue: Tissue providing hardness/strength (Answer: Sclerenchyma).Challenge Question (Ecology): Correct statement about ozone/UV (Official answer potentially flawed).Reproduction: Which is NOT a sign of sexual maturity (Answer: Eye color).Gravity: Correct statement about free fall (Answer: Acceleration independent of mass).Force (Numerical): Final velocity if 4N acts on 2kg (initial vel 2m/s) for 2s (Answer: 6 m/s).Energy (Numerical): PE of 5kg mass lifted 5m (g=10) (Answer: 250 J).Plant Cells: How plant cells change shape (Answer: By altering water content).Genetics: Dominant traits in Mendel's peas (Answer: Tall, Round).Energy (Numerical): KE of mass 2m, velocity v if mass m, velocity v has 100J (Answer: 200 J).Challenge Question (Plant Biology): Term for roots growing down, shoots up (Geotropism & Phototropism involved).Organic Chemistry: IUPAC names for Propanone and Ethanol.Plant Anatomy: Pores in leaf epidermis (Answer: Stomata).Units: Option equal to 1 Ohm (Answer: 1V / 1A).Chemical Formula: Formula of Calcium Oxide (Answer: CaO).Atomic Structure: Atomic number determined by...? (Answer: Protons).Energy (Numerical): Change in KE from 3m/s to 5m/s for 10kg object (Answer: 80 J).Respiration: Anaerobic product in muscle cells (Answer: Lactic acid).Units: Unit of refractive index (Answer: None).Colloids: Scattering of light by colloids phenomenon (Answer: Tyndall effect).Atomic Number: Atomic number of Phosphorus (Answer: 15).Reaction Type: Fe + CuSO4 reaction (Answer: Single displacement).Pressure (Numerical): Pressure for 50N on 1000 cm² (Answer: 500 Pa).Atomicity: Atomicity of O2 and P4 (Answer: 2 and 4).Fungi: Fungus with sporangia on hyphae (Answer: Rhizopus).Soap Action: Hydrophobic tail interacts with..., hydrophilic head with...? (Answer: Grease, Water).States of Matter: Which is NOT a property of solids.Circulatory System: Component transporting dissolved substances (Answer: Plasma).Pressure Units: Value of 1 atm pressure (Answer: ~10^5 Pa).Plant Reproduction: Transfer of pollen; If within same flower? (Answer: Pollination; Self-pollination).Reaction Type: Example of double displacement (Answer: BaCl2 + Na2SO4).Mixtures vs Compounds: Correct statements comparing them.Gravity: Weight on Moon if 60N on Earth (Answer: 10N).Asexual Reproduction: Cell division into two equal halves; Found in? (Answer: Binary fission; Amoeba).Chemistry: Full forms of CNG and LPG.Organic Chemistry: Classify C2H2, C2H4, C2H6 (Answer: Alkyne, Alkene, Alkane).Circuits: How to connect 3, 4, 6 Ω for 13Ω total? (Answer: Series).Power (Numerical): Power if 50J in 10s (Answer: 5W).States of Matter: Property of liquids (Answer: Higher diffusion rate than solids).Excretory System: Term for renal filtration unit (Answer: Nephron).Heat: Why cotton clothes preferred in summer.Kinematics (Numerical): Acceleration from rest to 24 m/s in 1 min (Answer: 0.4 m/s²).Reproduction: Method depends on organism's...? (Answer: Body design).Electromagnetism: Faraday's law relates to...? (Answer: Induction).Cell Biology: Organelle larger in plants, smaller in animals (Answer: Vacuole).Reproduction: Correct statement about male reproductive system (Answer: Testes produce testosterone).Energy: Incorrect statement about kinetic energy (Answer: KE due to position).Plant Hormones: Hormone promoting cell division (Answer: Cytokinin).Tissues: Tissue connecting nerve fibers into a nerve (Answer: Connective).Metals: Property allowing drawing into wires (Answer: Ductility).Atomic Structure: Max electrons in 2nd energy level (Answer: 8).Plant Tissue: Tissue in hard seed coats (Answer: Sclerenchyma).Mirrors: Point always on principal axis (Answer: Focus, Pole, Center of Curvature).Chemistry: Why silver turns black (Reaction with Sulphur).Reaction Type: Example of decomposition (Answer: AgCl decomposition).Force: Force type needed to move object (Answer: Unbalanced).Mirrors: Radius of curvature if focal length 12cm (Answer: 24cm).Biodegradability: Incorrect pair (Answer: Coal - not digested).Tissues: Body part lined with squamous epithelium (Answer: Skin/Mouth).Kinematics (Numerical): Final velocity (u=20, a=4, t=5) (Answer: 40 m/s).Kinematics: Equation for freely falling body velocity.Circulatory System: Correct statement about arteries/veins.States of Matter: Difference between solid/gas particles.Optics: Color deviating most through prism (Answer: Violet).Solutions: Formula for mass percentage.Energy (Numerical): KE of 0.1kg at 2m/s (Answer: 0.2 J).Nervous System: Function of Gustatory receptors (Answer: Taste).Cell Biology: Matching organelles to functions.Neutralization: Reaction between acid and base.Phase Change: Phase transformation during deposition (Answer: Gas to Solid).Evolution/Ecology: What helps population survive drastic changes (Answer: Variation).Reaction Type: CuSO4 + Fe reaction (Answer: Single Displacement).Reactivity Series: Least reactive among Fe, Zn, Pb, Cu (Answer: Copper).Chemistry: Products of Chlor-alkali process (Answer: NaOH, Cl2, H2).Magnetism: Direction of curled fingers in Right Hand Thumb rule.Work: Work done pushing immovable object (Answer: Zero).Work: Work done by retarding force (Answer: Negative).Combustion: Burning of coal is example of...? (Answer: Combination/Oxidation).Atomic Mass: Unit mass of Sodium (Answer: 23u).Atomic Model: Fruit compared to atom by Thomson (Answer: Watermelon).Optics: Refractive index relates to...? (Answer: Speed of light ratio).Challenge Question (Biology): Correct statement about regeneration. (Speaker reviewing official answer C).Bonding: Molecule with single covalent bonds (Answer: H2).Plant Physiology: Correct statements about transpiration.Eye Defects: Myopia means...? (Answer: Nearsightedness).Resistance: Effect of doubling length on resistance (Answer: Doubles).Asexual Reproduction: Method in Hydra/Planaria from cut pieces (Answer: Regeneration).Plant Tissue: Incorrect statement about complex tissues (Xylem/Phloem).Atomic History: Foil used by Rutherford (Answer: Gold).Asexual Reproduction: Vegetative propagation in Bryophyllum (Answer: Leaf buds).Plant Reproduction: Vegetative propagation in sugarcane (Answer: Stem).Challenge Question (Plant Hormones): Incorrect statement about plant hormones (Speaker identifies issue with Cytokinin/dormancy).Heterogeneous Mixtures: Correct statement.Refraction: Correct statement based on laws of refraction (Snell's Law).Work-Energy: What occurs if force causes displacement (Answer: Work is done).Precipitation Reaction: Color of precipitate in BaCl2 + Na2SO4 (Answer: White).Ozone: Correct statement about ozone (Answer: Toxic; O3 molecule).Circular Motion (Numerical): Speed for lap (radius r) in time t (Answer: 2πr / t).Biodegradability: Which is NOT biodegradable (Answer: Plastic bottle).Magnetism: Field lines inside solenoid (Answer: Parallel, uniform).Reproduction: Structure carrying egg from ovary to uterus (Answer: Fallopian tube).Nervous System: Brain part controlling involuntary actions (Answer: Medulla Oblongata).Mirrors: Aperture refers to...? (Answer: Diameter of reflector).Metals: Oxides of metals are generally...? (Answer: Basic).Subatomic Particles: Which is NOT subatomic (Answer: Molecule).Cell Potency: Single cell forms organism EXCEPT in? (Answer: Rhizopus context).Conservation of Mass: Mass of products if 10g A + 15g B react (Answer: 25g).Reflex Action: Example of reflex action (Answer: Hand withdrawal from flame).Organic Chemistry: Series CH3OH, C2H5OH etc. belong to (Answer: Homologous).Circuits: Effect on current if R is halved, V constant (Answer: Doubles).Bonding: True statement for ionic compounds (Answer: Electron transfer Metal -> Non-metal).Units: Pair with same units (Answer: Work & Energy).pH: Substance with highest basicity (Answer: NaOH solution).Genetics: Number of sex chromosome pairs in humans (Answer: One).Plant Hormones: Hormone promoting growth.Electricity Applications: Practical use of electricity (heating/lighting).Asexual Reproduction: Incorrect match (Answer: Bryophyllum - spores).States of Matter: How to liquefy gas (Answer: High pressure, low temp).Asexual Reproduction: Organism reproducing by spores (Answer: Rhizopus).Plant Physiology: Correct statements about plant waste removal.Plant Reproduction: Structure after zygote divides in ovule (Answer: Embryo).Nervous System: Components of Peripheral Nervous System (Answer: Cranial & Spinal nerves).Diffusion: Effect of heating on diffusion rate (Answer: Increases).Floating: Condition for floating based on density.Suspensions: Property of suspensions (Answer: Heterogeneous).Energy: Energy in a moving bullet (Answer: Kinetic).Electricity: Electrons in 1 Coulomb charge (Answer: 6.25 x 10^18).Units: SI unit of force (Answer: Newton).Magnetism: Field strength inside solenoid (Answer: Uniform).Chemistry: Formation of Plaster of Paris (Heating Gypsum).Asexual Reproduction: Organism using multiple fission (Answer: Plasmodium).Motion: Statement for uniform motion (Answer: Constant speed/velocity).Asexual Reproduction: Methods used by unicellular organisms.Laws of Motion: Newton's 3rd law statement.Cell Biology: Statement about prokaryotic cells (Answer: Lack nuclear membrane).Optics: Cause of twinkling stars (Answer: Atmospheric refraction).Units: Unit of EMF (Answer: Volt).Atomic Mass: Atomic mass of Sulphur (Answer: 32u).Chemistry: Use of bleaching powder in industry (Answer: Oxidizing agent).States of Matter: Example of solid state pair (Answer: Sugar, Sponge).Resistance: Relation between resistance and area (Answer: Inversely proportional).Atomic Structure: Nucleons refer to...? (Answer: Protons + Neutrons).Energy: Mechanical energy is sum of...? (Answer: PE + KE).Organic Chemistry: Compounds with C-C single bonds (Answer: Saturated/Alkanes).Hormones: Fight/Flight hormone (Answer: Adrenaline).Challenge Question (Atomic Structure): Isobar of Argon (Ca or K potential answers).Magnetism: Field lines inside solenoid (Answer: Parallel straight).Heat (Numerical): Current if 400J/s heat in 4Ω resistor (Answer: 10A).Asexual Reproduction: Method in Spirogyra (Answer: Fragmentation).Diffusion: Why faster in liquids than solids.Plant Growth: Change due to light/gravity stimuli (Answer: Tropisms - root/shoot growth).Phase Change: Which is NOT a phase change (Answer: Excretion).Molecules: Diatomic molecule example (Answer: O2).Asexual Reproduction: Method in Bryophyllum (Answer: Leaf buds).Plant Growth: Why growth only in specific regions (Answer: Meristematic tissue).Units: Correct units for Resistance (Ohm) & Resistivity (Ohm-meter).Chemical Reactions: Indication of chemical reaction.Challenge Question (Plant Hormones): Correct match for hormone functions (Speaker identifies issues with options).Chemical Reactions: Color of gas heating Lead Nitrate (Answer: Brown - NO2).Optics: Ratio sin i / sin r (rarer to denser) (Answer: Constant > 1).Resistance: How to increase resistance of conductor (Answer: Decrease area).Chemical Reactions: Forming Na2CO3 from NaHCO3 (Answer: Heating).Molecular Mass: Molecular mass of O2 (Answer: 32u).Hormones: Hormone controlling Carb/Protein/Fat metabolism (Answer: Thyroxine).Mirrors: Diameter of reflecting surface (Answer: Aperture).Metals: Metal catching fire in air (Answer: Sodium/Potassium).Work: When work is negative (Answer: Force opposite displacement).Kinematics: Final velocity falling from height h (Answer: v²=2gh).Units: 1 Volt equals...? (Answer: 1 J / 1 C).Reaction Type: Reaction with ion exchange (Answer: Double displacement).Plants: Structure helping pea plant climb (Answer: Tendrils).Excretion: Incorrect statement about human excretion.Nervous System: Components of CNS (Answer: Brain & Spinal Cord).Plant Hormones: Function of Auxin (Answer: Cell elongation).Gravity: Gravitational acceleration 'g' depends on...? (Answer: Earth's mass/radius).Asexual Reproduction: Method in Spirogyra (Answer: Fragmentation).Kinetic Theory: KE of particles vs temperature (Answer: Increases).
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