NEET Prep

NEET 2025

149 questions from the 2025 paper. A sample is shown below with full explanations.

Molecular Basis of Inheritance 8Human Health and Disease 5Human Reproduction 5Plant Kingdom 5Sexual Reproduction in Flowering Plants 5Animal Kingdom 4Biomolecules (Biology) 4Cell — The Unit of Life 4Chemical Coordination and Integration 4Microbes in Human Welfare 4Optics 4Structural Organisation in Animals 4Biotechnology and its Applications 3Biotechnology — Principles and Processes 3Ecosystem 3Electrostatics 3Magnetic Effects of Current and Magnetism 3Organisms and Populations 3Solutions 3Amines 2Some Basic Concepts of Chemistry 2Biodiversity and Conservation 2Biomolecules (Chemistry) 2Chemical Bonding and Molecular Structure 2Chemical Kinetics 2Coordination Compounds 2d- and f-Block Elements 2Dual Nature of Matter and Radiation 2Electromagnetic Waves 2Equilibrium 2Gravitation 2Kinematics 2Kinetic Theory of Gases 2Laws of Motion 2Morphology of Flowering Plants 2Organic Chemistry — Basic Principles 2Oscillations and Waves 2p-Block Elements 2Classification of Elements and Periodicity 2Photosynthesis in Higher Plants 2Plant Growth and Development 2Principles of Practical Chemistry 2Principles of Inheritance and Variation 2System of Particles and Rotational Motion 2Structure of Atom 2Units and Measurements 2Alcohols 1Aldehydes 1Anatomy of Flowering Plants 1Atoms and Nuclei 1Biological Classification 1Body Fluids and Circulation 1Breathing and Exchange of Gases 1Cell Cycle and Cell Division 1Chemical Thermodynamics 1Current Electricity 1Electrochemistry 1Electromagnetic Induction and AC 1Evolution 1Reproductive Health 1Respiration in Plants 1The Living World 1Thermodynamics 1Work 1
Thermodynamics2025medium

Q1.Two gases A and B are filled at the same pressure in separate cylinders with movable pistons of radius rA and rB, respectively. On supplying an equal amount of heat to both the systems reversibly under constant pressure, the pistons of gas A and B are displaced by 16 cm and 9 cm, respectively. If the change in their internal energy is the same, then the ratio rA/rB is equal to

  • A4/3
  • B3/4Answer
  • C2/3
  • D3/2

Explanation

By the first law Q = ΔU + W, and since both Q and ΔU are equal for the two gases the work must be equal too. At constant pressure W = PΔV, so πrA²dA = πrB²dB, giving rA/rB = √(dB/dA) = √(9/16) = 3/4.

Source: NEET 2025 (4 May), Code 45, Q41

Optics2025medium

Q2.The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at 22.5° from the polarization axis of one of the polaroids, is (I₀ is the intensity of polarised light after passing through the first polaroid):

  • AI₀/2
  • BI₀/4
  • CI₀/8Answer
  • DI₀/16

Explanation

Applying Malus's law twice gives I = I₀ cos²(22.5°) cos²(67.5°). Since cos 67.5° = sin 22.5°, this becomes I₀[sin(45°)/2]² = I₀/8 — note that inserting a middle sheet lets light through two crossed polaroids that would otherwise pass none at all.

Source: NEET 2025 (4 May), Code 45, Q43

Principles of Practical Chemistry2025medium

Q3.Match List-I with List-II and choose the correct answer from the options given below.

  • List-I (Ion):
  • A. Co²⁺
  • B. Mg²⁺
  • C. Pb²⁺
  • D. Al³⁺
  • List-II (Group number in cation analysis):
  • I. Group-I
  • II. Group-III
  • III. Group-IV
  • IV. Group-VI
  • AA-III, B-IV, C-II, D-I
  • BA-III, B-IV, C-I, D-IIAnswer
  • CA-III, B-II, C-IV, D-I
  • DA-III, B-II, C-I, D-IV

Explanation

Pb²⁺ is precipitated as the chloride by dilute HCl, so it is Group-I. Al³⁺ is precipitated as the hydroxide by NH₄OH in presence of NH₄Cl, so it is Group-III. Co²⁺ is precipitated as the sulphide by H₂S in ammoniacal medium, making it Group-IV. Mg²⁺ is not precipitated by any of the earlier group reagents and is left to Group-VI. That gives A-III, B-IV, C-I, D-II.

Source: NEET 2025 (4 May), Code 45, Q48

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Questions are reformatted from NEET previous year papers with original explanations and topic tagging. NEET Prep is not affiliated with the NEET examining body.