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NEST (NISER) 2023 Session 1

Browse the complete Biology, Chemistry, Mathematics, and Physics question set from the NEST (NISER) 2023 Session 1 paper, question by question. Each question shows a quick preview so you can jump straight to the topic or subject you want to revise. Click through to attempt the full question in practice mode, or head back to the paper-wise list to download the entire paper as a PDF.

This paper has 68 questions in total - 1 easy (1%), 54 moderate (79%) and 13 tough (19%). That's a fairly typical mix for this exam. By subject: Biology 6% easy, 88% moderate, 6% tough; Chemistry 0% easy, 82% moderate, 18% tough; Mathematics 0% easy, 82% moderate, 18% tough; Physics 0% easy, 65% moderate, 35% tough.

Biology questions were spread across 12 chapters, with Principles of Inheritance and Variation (3), Ecosystem (2), and Microbes in Human Welfare (2) carrying the most weight. Chemistry questions were spread across 15 chapters, with Chemical Bonding and Molecular Structure (2), Haloalkanes and Haloarenes (2), and Alcohols Phenols and Ethers (1) carrying the most weight. Mathematics questions were spread across 10 chapters, with Quadratic Equation (3), Application of Derivatives (2), and Continuity and Differentiability (2) carrying the most weight. Physics questions were spread across 14 chapters, with Electrostatics (2), Thermodynamics (2), and Waves and Sound (2) carrying the most weight.

Biology

  1. 1Bacterial endospores are highly resistant to environmental stressors such as heat, UV radiation, and oxidizing agents. They can remain dorma2023 (Session 1)Viruses
  2. 2A biochemist wants to purify a protein X (molecular weight and ) from a solution containing proteins X and Y (molecular weight and using ion2023 (Session 1)Enzymes
  3. 3A monoclonal (antibody specific for a given epitope of an antigen) IgG antibody (M) was produced in the laboratory that binds to a surface p2023 (Session 1)Acquired immunity
  4. 4A 1000 base pair double-stranded DNA (B form) has a melting temperature of . If a duplex RNA (A form) of the same length and sequence is con2023 (Session 1)Structure of DNA
  5. 5A cladogram representing the evolution of some animals ( and ) is shown. I to IV in the cladogram represent different features that have evo2023 (Session 1)Evidences of Evolution
  6. 6In a closed ecosystem, red algae, crabs and green algae are present and interact with each other. In order to understand the interactions be2023 (Session 1)Components of Ecosystem
  7. 7Pea seeds were allowed to germinate for 4 days and segments of the epicotyl around 1 cm were cut and placed in a nutrient solution having pH2023 (Session 1)Aerobic Respiration
  8. 8A population has a single locus with three alleles ( , and X 3 ). The frequencies of these alleles are and r , respectively, and if , then t2023 (Session 1)Mendel's Laws of Inheritance
  9. 9The permeability of molecules across a lipid bilayer depends on their size and solubility in a nonpolar solvent relative to their solubility2023 (Session 1)Cell Membranes
  10. 10A genetic engineering experiment resulted in a new haemoglobin variant which exists primarily as dimers in solution. Based on the oxygen sat2023 (Session 1)Blood Group
  11. 11In the given pedigree, circles represent females and squares represent males. Filled shapes indicate affected individuals while unfilled sha2023 (Session 1)Genetic Disorders
  12. 12Mendelian theory of inheritance was crucial for Darwin-Wallace's theory of natural selection because2023 (Session 1)Mendel's Laws of Inheritance
  13. 13Synthesis of ATP takes place when protons flow back to the matrix side through an enzyme complex called ATP synthase. ATP synthase is made u2023 (Session 1)Cellular Respiration
  14. 14A hospital witnessed an outbreak of a nosocomial (hospital-acquired) infection caused by Klebsiella pneumoniae. It showed resistance to anti2023 (Session 1)Biocontrol Agents
  15. 15In the ABC model, the acquisition of floral organ identity is regulated by the floral homeotic genes namely A, B and C. A wild-type flower i2023 (Session 1)Sexual Reproduction
  16. 16Auxotrophs are organisms with mutations that have lost the ability to synthesise essential organic compounds, and hence need supplements for2023 (Session 1)Biocontrol Agents
  17. 17Energy diagrams allow ecologists to compare patterns of energy flow through the trophic levels of different ecosystems while biomass diagram2023 (Session 1)Functions of Ecosystem

Chemistry

  1. 1Boron on reaction with fluorine forms , which on reaction with NaH at a high temperature produces along with a sodium salt. on reaction with2023 (Session 1)Boron and Its Compounds
  2. 2Pyrophosphoric acid and pyrophosphorous acid are oxyacids of phosphorous. The number of P-OH bonds present in pyrophosphoric acid and pyroph2023 (Session 1)Phosphorus and Its Compounds
  3. 3The pair of molecules having the same shape is2023 (Session 1)Hybridisation and VSEPR Theory
  4. 4The ground state electronic energy of He atom ( ) can be expressed in terms of the ground state energy of the hydrogen atom and the electron2023 (Session 1)Bohr's model
  5. 5Among the following graphs, the one that represents the correct trend in the third ionization energy of lanthanum and the lanthanoids is2023 (Session 1)F-Block elements
  6. 6Consider a metal crystal with simple cubic, fce, and bce structures. Assume that the nearest neighbour atoms (spheres) touch each other in t2023 (Session 1)Cubic system
  7. 7The reaction of the alkali metals with oxygen results in the formation of different alkali metal oxides, monoxides, peroxides and superoxide2023 (Session 1)General Characteristics of Alkali Metals
  8. 8When levorotatory 2-methylbutan-1-0l is heated with concentrated HCl , dextrorotatory 1-chloro-2-methylbutane ( is formed. The correct state2023 (Session 1)Reactions of Alcohols
  9. 9A certain amount ( moles) of a monoatomic ideal gas changes from an initial state to a final state . Let , and represent the changes in inte2023 (Session 1)Laws of Thermochemistry and Enthalpy Change
  10. 10In the reaction shown below, the product is2023 (Session 1)Preparation and Properties of Monohalides
  11. 11A mixture of 0.1 mol of a weak acid HX and 0.2 mol of another weak acid HY is dissolved in 1 kg of water. The degrees of ionization of the t2023 (Session 1)Solubility and Concentration of Solutions
  12. 12In the reaction shown below, the major hydrocarbon product is2023 (Session 1)Grignard Reagent
  13. 13Negatively charged monodentate strong field ligand and weak field ligand form complexes and , respectively, under certain reaction condition2023 (Session 1)Crystal Field Theory
  14. 14The bonding in the species HeH can be sutuded in a way similar to that of the . The correct statement(s) is(are):2023 (Session 1)Molecular Orbital Theory
  15. 15Among the following pairs, the pairs that represent resonance structures are2023 (Session 1)Conjugation and Aromaticity
  16. 16Consider the following mechanism of a reaction. The correct statement(s) is(are):2023 (Session 1)Chemical reactions for aldehydes and ketones
  17. 17The hydrolysis of sucrose in excess acid solution follows first-order kinetics and results in D-glucose and D-fructose. Since, sucrose, D-gl2023 (Session 1)Integrated rate laws

Mathematics

  1. 1In a throw of a (biased single) dice, the probability of the outcome being a number is if is even, and if is odd. If the dice is thrown twic2023 (Session 1)Total Probability
  2. 2Let be a differentiable function such that for all . Then2023 (Session 1)Monotonicity
  3. 3The number of real roots of is2023 (Session 1)N degree equation
  4. 4Define Let be the function defined by . Then the number of discontinuities of is2023 (Session 1)Continuity
  5. 5Let be the set of all natural numbers such that (i) , (ii) 0 appears at least once as a digit in the decimal expansion of , and (iii) the su2023 (Session 1)Combination
  6. 6If are matrices with entries in , satisfying the condition , then2023 (Session 1)Inverse of a Matrix
  7. 7The horizontal line intersects the parabola at points and . If the length of is 8 , then the value of is2023 (Session 1)Relation between Roots and Coefficients
  8. 8Let be a complex number such that and . Let and denote the identity matrix. Then the value of is2023 (Session 1)Basic Algebra of Matrices
  9. 9Let be an integer. Let be points in the plane, which are the vertices of a regular -gon. The number of obtuse-angled triangles with vertices2023 (Session 1)Combination
  10. 10Let . The value of is2023 (Session 1)Algebraic and Rational Limits
  11. 11Let be a continuous function such that and and let be the function defined by for all . Then the value of is2023 (Session 1)Differentiability
  12. 12Let be a differentiable function such that for all . Then2023 (Session 1)Monotonicity
  13. 13Let be sets and and be functions. Then2023 (Session 1)Types of Function (Mapping)
  14. 14Let be a continuous function and be a polynomial of degree 4 with coefficients in . If for all , then2023 (Session 1)Composite Function
  15. 15Let and be two points on the parabola and 0 be the origin . If2023 (Session 1)standard equation of parabola
  16. 16Let and be the vertices of the parabolae and , respectively. If and are the points of intersection of the parabolae then the slope of the li2023 (Session 1)Relation between Roots and Coefficients
  17. 17Let be a triangle with and . Let be a point on the segment such that and be a point on the segment such that . Let be the midpoint of . Let 2023 (Session 1)Coordinate System

Physics

  1. 1A metal rod, connected between two high voltage electrodes, attains steady-state temperature through a balance between radiated power loss a2023 (Session 1)Radiation
  2. 2Thermodynamic processes in which an ideal gas passes through states 1,2 and 3 are shown in the figure where are pressure, volume and tempera2023 (Session 1)Thermodynamic Processes
  3. 3A thin spherical copper shell of radius , completely filled with a viscouss fluid, is rotating about the vertical axis with a constant angul2023 (Session 1)Angular momentum and Angular impulse
  4. 4A proton accelerated from rest by a potential difference of volts has a de Broglie wavelength of . A fully ionized Helium atom is similarly 2023 (Session 1)Matter Waves
  5. 5A spherical comet having mass and radius is moving towards a planet of mass as shown in the figure. At a separation distance , equal gravita2023 (Session 1)Newton’s Law of Gravitation
  6. 6Consider the Bohr model of the hydrogen atom with Bohr radius . If the mass of the electron and that of the proton become twice the present 2023 (Session 1)Bohr's Atomic Model
  7. 7A horizontal straight wire of length is placed perpendicular to a long current carrying straight vertical wire at a distance of and lies in 2023 (Session 1)Force and Torque on Current Carrying Conductor
  8. 8A slow steady stream of water is falling onto a tall cylindrical bucket. Let denote the dominant frequency of the sound of the fall onto the2023 (Session 1)Properties of Sound Waves
  9. 9Two radioactive samples and have the same number of atoms initially . The half life of is half the mean life of . Then is seven times when i2023 (Session 1)Radioactivity
  10. 10A double convex lens of the objective is changed to plano-convex. The objective is made of a plastic material with refractive index 1.3. The2023 (Session 1)Lens Formula, Refraction of light from curved surface
  11. 11An elastic conducting ring of mass is extended radially with constant speed in an uniform magnetic field of strength which is perpendicular 2023 (Session 1)Magnetic Flux, Faraday's and Lenz law
  12. 12An accelerating train (acceleration ) of blocks have a mass distribution as shown in the figure. The rightmost block of mass is the engine. 2023 (Session 1)Spring force
  13. 13An elastic wave generates a stress of magnitude while propagating in a wire. The relation between its frequency and the wavevector is given 2023 (Session 1)Basics of Mechanical Waves
  14. 14A point object P of mass and charge is placed at a distance from a stationary object of mass and charge . Let be the time for to reach if it2023 (Session 1)Newton’s Law of Gravitation
  15. 15The correct statement(s) about an ideal gas is(are)2023 (Session 1)First Law of Thermodynamics
  16. 16The electrostatic potential in the region between two long coaxial cylinders of radii and is given by , where and are constants. Here, and d2023 (Session 1)Electric Field and Electric Field Lines
  17. 17Two plane waves having amplitude are described by and . The wavevectors and pass through the origin making an angle of with -axis, as shown 2023 (Session 1)Interference of Light

Frequently Asked Questions

1.How many questions are in the NEST (NISER) 2023 Session 1 paper?

This paper has 68 questions in total - 17 each from Biology, Chemistry, Mathematics, and Physics.

2.Can I practise questions from just one subject?

Yes. Use the Biology, Chemistry, Mathematics, and Physics tabs at the top of the page to jump directly to that subject's question set within this paper.

3.Where can I find the Session 2 paper for the same year?

The NEST (NISER) 2023 Session 2 paper is listed separately - you can switch to it from the "NEST (NISER) Paper Wise PYQs" panel, under NEST (NISER) 2023.

4.What is the structure of the NEST (NISER) 2023 Session 1 paper?

The NEST (NISER) 2023 Session 1 paper on MARKS has 68 questions, organised by subject:

  • Biology: 17 questions - 12 single-correct and 5 multiple-correct.
  • Chemistry: 17 questions - 12 single-correct and 5 multiple-correct.
  • Mathematics: 17 questions - 12 single-correct and 5 multiple-correct.
  • Physics: 17 questions - 12 single-correct and 5 multiple-correct.
5.What is the difficulty level of the NEST (NISER) 2023 Session 1 paper?

Each question on MARKS carries a difficulty rating. Of the 68 rated questions in this paper, 1 (1%) are easy, 54 (79%) are medium and 13 (19%) are hard. Subject wise:

  • Biology: 1 easy, 15 medium, 1 hard
  • Chemistry: 0 easy, 14 medium, 3 hard
  • Mathematics: 0 easy, 14 medium, 3 hard
  • Physics: 0 easy, 11 medium, 6 hard
6.Which chapters had the most questions in the NEST (NISER) 2023 Session 1 paper?

The chapters with the most questions in each subject were:

  • Biology: Principles of Inheritance and Variation (3), Ecosystem (2), and Microbes in Human Welfare (2).
  • Chemistry: Chemical Bonding and Molecular Structure (2) and Haloalkanes and Haloarenes (2).
  • Mathematics: Quadratic Equation (3), Application of Derivatives (2), and Continuity and Differentiability (2).
  • Physics: Electrostatics (2), Thermodynamics (2), and Waves and Sound (2).
7.Where can I find the solutions for the NEST (NISER) 2023 Session 1 paper?

Open any question on this page. Its page shows the correct answer and, where one is available, the worked solution. A downloadable PDF of the whole paper is coming soon.

8.How should I use the NEST (NISER) 2023 Session 1 paper to check my preparation?

Set a timer, attempt the 68 questions as you would in the exam, and only then open the answers. Note which subjects and chapters cost you the most marks, and revise those first using the chapter-wise practice for NEST (NISER). Repeating this with other papers shows whether the same weak spots keep coming back.

9.Will the NEST (NISER) 2023 Session 1 paper help me prepare for NEST (NISER) 2027?

Yes. Every past paper shows the question styles and topics NEST (NISER) has asked before, and a solved paper gives you a realistic benchmark for speed and accuracy. Use it along with the other papers to spot the chapters that keep returning.