NEET Prep

NEET 2020

153 questions from the 2020 paper. A sample is shown below with full explanations.

Biotechnology — Principles and Processes 6Biomolecules (Biology) 5Animal Kingdom 4Cell Cycle and Cell Division 4Electrostatics 4Evolution 4Molecular Basis of Inheritance 4Principles of Inheritance and Variation 4Atoms and Nuclei 3Biotechnology and its Applications 3Chemical Coordination and Integration 3Chemical Thermodynamics 3Current Electricity 3Human Health and Disease 3Human Reproduction 3Morphology of Flowering Plants 3Optics 3p-Block Elements 3Plant Growth and Development 3Plant Kingdom 3Sexual Reproduction in Flowering Plants 3Structural Organisation in Animals 3Units and Measurements 3Alcohols 2Anatomy of Flowering Plants 2Biodiversity and Conservation 2Body Fluids and Circulation 2Breathing and Exchange of Gases 2Cell — The Unit of Life 2Chemical Bonding and Molecular Structure 2Chemical Kinetics 2Coordination Compounds 2d- and f-Block Elements 2Dual Nature of Matter and Radiation 2Ecosystem 2Electrochemistry 2Electromagnetic Induction and AC 2Electromagnetic Waves 2Electronic Devices 2Equilibrium 2Kinetic Theory of Gases 2Microbes in Human Welfare 2Organic Chemistry — Basic Principles 2Oscillations and Waves 2Classification of Elements and Periodicity 2Photosynthesis in Higher Plants 2Properties of Bulk Matter 2Reproductive Health 2Solutions 2Aldehydes 1Amines 1Some Basic Concepts of Chemistry 1Biological Classification 1Biomolecules (Chemistry) 1Excretory Products and their Elimination 1Experimental Skills 1Gravitation 1Haloalkanes and Haloarenes 1Hydrocarbons 1Kinematics 1Laws of Motion 1Locomotion and Movement 1Magnetic Effects of Current and Magnetism 1Neural Control and Coordination 1Organisms and Populations 1Redox Reactions 1Respiration in Plants 1System of Particles and Rotational Motion 1Structure of Atom 1Thermodynamics 1
Kinetic Theory of Gases2020medium

Q1.A cylinder contains hydrogen gas at a pressure of 249 kPa and temperature 27°C. Its density is (R = 8.3 J mol⁻¹ K⁻¹)

  • A0.2 kg/m³Answer
  • B0.1 kg/m³
  • C0.02 kg/m³
  • D0.5 kg/m³

Explanation

From the ideal gas equation the density is PM/RT. Hydrogen has a molar mass of 2 grams per mole, so the density is 249000 multiplied by 0.002, divided by 8.3 multiplied by 300. That gives 498 divided by 2490, which is 0.2 kg per cubic metre.

Source: NEET 2020 (13 Sept), Code G1, Q2

Electromagnetic Waves2020easy

Q2.Light with an average flux of 20 W/cm² falls on a non-reflecting surface at normal incidence having a surface area of 20 cm². The energy received by the surface during a time span of 1 minute is

  • A12 × 10³ J
  • B24 × 10³ JAnswer
  • C48 × 10³ J
  • D10 × 10³ J

Explanation

Energy equals flux multiplied by area multiplied by time. That is 20 W per square centimetre multiplied by 20 square centimetres, giving 400 W, and 400 W acting for 60 seconds delivers 24000 joules, or 24 × 10³ J.

Source: NEET 2020 (13 Sept), Code G1, Q3

Laws of Motion2020easy

Q3.Two bodies of mass 4 kg and 6 kg are tied to the ends of a massless string. The string passes over a pulley which is frictionless. The acceleration of the system in terms of the acceleration due to gravity (g) is

  • Ag/2
  • Bg/5Answer
  • Cg/10
  • Dg

Explanation

For two masses over a frictionless pulley the acceleration is the difference in weights divided by the total mass. That is (6 minus 4) g divided by (6 plus 4), which is 2g/10, or g/5.

Source: NEET 2020 (13 Sept), Code G1, Q4

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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.