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NEST (NISER) 2021 Session 1

Browse the complete Biology, Chemistry, Mathematics, and Physics question set from the NEST (NISER) 2021 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 67 questions in total - 4 easy (6%), 49 moderate (73%) and 14 tough (21%). That's a fairly typical mix for this exam. By subject: Biology 0% easy, 94% moderate, 6% tough; Chemistry 12% easy, 71% moderate, 18% tough; Mathematics 13% easy, 56% moderate, 31% tough; Physics 0% easy, 71% moderate, 29% tough.

Biology questions were spread across 13 chapters, with Molecular Basis of Inheritance (4), Principles of Inheritance and Variation (2), and Biological Classification (1) carrying the most weight. Chemistry questions were spread across 14 chapters, with Hydrocarbons (2), States of Matter (2), and p Block Elements (Group 15, 16, 17 & 18) (2) carrying the most weight. Mathematics questions were spread across 11 chapters, with Basic of Mathematics (3), Permutation Combination (3), and Complex Number (2) carrying the most weight. Physics questions were spread across 13 chapters, with Thermodynamics (3), Dual Nature of Matter (2), and Thermal Properties of Matter (2) carrying the most weight.

Biology

  1. 1Similarity between DNA sequences of two eukaryotic species is used to predict their evolutionary relatedness, pointing to a shared ancestry.2021 (Session 1)The Search for Genetic Material
  2. 2Three different proteins ( and ) that are known to be transported from the cytoplasm into different organelles were studied. Protein was fou2021 (Session 1)Cell Organelles
  3. 3The deletion of a segment of mitochondrial DNA, specifically in the mature sperm of Mr. P led to infertility. This deletion results in the l2021 (Session 1)Infertility
  4. 4Bacteria can be divided into four groups based on the optimal temperatures under which they grow: psychrophiles , mesophiles , facultative t2021 (Session 1)Kingdom Monera
  5. 5The pathway that determines skin pigmentation in dogs is governed by two unlinked genes ( and II). While gene determines the type of pigment2021 (Session 1)Mendel's Laws of Inheritance
  6. 6When a 100 mL of Escherichia coli culture is grown at under laboratory conditions, the population of cells exhibit four distinct phases (Fig2021 (Session 1)Introduction
  7. 7Statements about the effect of concentration, temperature and light intensity on the rate of photosynthesis in C3 and C4 plants are given. B2021 (Session 1)Factor Affecting Photosynthesis
  8. 8Tetanus is caused by a toxin secreted by the bacterium Clostridium tetani. If a person infected with Clostridium tetani manifests early symp2021 (Session 1)Acquired Immunity
  9. 9An autosomal dominant muscular dystrophy is caused by a decrease in the repeat number of a VNTR present on chromosome 4 of humans. Each repe2021 (Session 1)DNA Fingerprinting
  10. 10A linear double-stranded DNA was completely digested using either one or two restriction endonucleases ( and BanII). The sequence of one of 2021 (Session 1)DNA Fingerprinting
  11. 11A leaf-infecting fungus secretes a chemical that causes the guard cells to remain open thereby enabling the fungus to enter the plant tissue2021 (Session 1)Transpiration
  12. 12The quantities and were measured independently for an enzymatic reaction using enzymes E1, E2, E3 and E4 isolated from four different organi2021 (Session 1)Enzymes
  13. 13Compared to differentiated cells, stem cells have a longer interphase. Three different human alveolar cell-types (stem cells, normal cells a2021 (Session 1)Interphase
  14. 14In the given pedigree, circles represent females and squares represent males. Filled shapes indicate affected individuals; while, unfilled s2021 (Session 1)Genetic Disorders
  15. 15Escherichia coli strains (I-IV) with mutations in the lac operon were studied for galactosidase activity, followed by measuring its mRNA and2021 (Session 1)Regulation of Gene Expression
  16. 16Deep-sea divers are trained to hold their breath under water for an extended period by practicing hyperventilation exercises before the dive2021 (Session 1)Human Respiratory System
  17. 17Coffee leaf rust is caused by the fungus Hemileia vastatrix. Lecanicillium lecanii, a saprophytic fungus is often found on the coffee leaves2021 (Session 1)Populations

Chemistry

  1. 1reacts with to form an adduct . The shape/geometry around the Xe and Sb ions, in the adduct, are respectively2021 (Session 1)Noble Gases
  2. 2Assume that fullerene in gas phase behaves as a van der Waals gas. The van der Waals constant, , for fullerene gas is . The correct statemen2021 (Session 1)Real Gases and Van der Waal's Equation
  3. 3Peroxodisulphuric acid2021 (Session 1)Sulphur and Its Compounds
  4. 4The correct statement regarding a soap solution in water at a low concentration is2021 (Session 1)Cleansing Agents
  5. 5The reagent that can transform benzene-1,2-dicarbaldehyde to sodium 2-(hydroxymethyl) benzoate is2021 (Session 1)Chemical reactions for aldehydes and ketones
  6. 6in an acidified aqueous solution forms an complex. In this complex ion, the hybridization of Al is2021 (Session 1)Werner's theory and Valence Bond Theory
  7. 7Let the ground state electronic energy of hydrogen atom be . The first excited state energy of deuterium atom (in eV ) is2021 (Session 1)Bohr's model
  8. 8The anti-COVID-19 drug 2-DG is recently developed by the Institute of Nuclear Medicine and Allied Sciences (INMAS), Defence Research and Dev2021 (Session 1)Drugs and It's Classification
  9. 9The correct order of the calculated spin-only magnetic moment for the selected first row transition metal ions is2021 (Session 1)Properties of D-block elements
  10. 10The elevation of boiling point and depression of freezing point of a certain solution of a monobasic acid HA in benzene are and , respective2021 (Session 1)Colligative Properties and Abnormal Molecular Masses
  11. 11A mixture containing almost equal quantities of all dimethylbenzenes is reacted with two equivalents of methyl chloride in the presence of a2021 (Session 1)Reactions of aromatic compounds
  12. 12The steps, in one of the possible reaction mechanisms, corresponding to the preparation of acetone from isopropyl alcohol by using and conc.2021 (Session 1)Reactions of Alcohols
  13. 13The rate of a chemical reaction is plotted against time in graph 1 . The initial rate of the reaction is . The plot of with time is shown in2021 (Session 1)Integrated rate laws
  14. 14Molecular orbitals are formed by the overlap of suitable atomic orbitals from different atoms. Symmetry and energies of the overlapping orbi2021 (Session 1)Molecular Orbital Theory
  15. 15One mole of -2-bromobutane is hydrolysed in an alkaline medium to form butane-2ol. The rate of formation of -butane-2-ol is assumed to be tw2021 (Session 1)Preparation and Properties of Monohalides
  16. 16In the addition reaction of propene with bromine water, propene first reacts with to form the bromonium ion intermediate and bromide ion. Th2021 (Session 1)Reactions of alkenes
  17. 17One litre of water is kept in a closed two litre vessel at temperature T with no air in the space above the liquid (System 1). Another ident2021 (Session 1)Mixture of gases

Mathematics

  1. 1Suppose is a differentiable function on , such that the derivative of is continuous on . Let and . Then is2021 (Session 1)Definite Integration by Substitution
  2. 2Let be a cube root of 1 , which is different from 1 . Then the value of is2021 (Session 1)Cube Root of Unity
  3. 3Ameeya has 25 cards, each having a different integer from 1 to 25 printed on it. He wishes to place cards in a single row so that the number2021 (Session 1)Permutation
  4. 4A pair of positive integers is said to be a happy pair if is a perfect square. Suppose is a positive integer such that is a happy pair. Then2021 (Session 1)Divisibility Test
  5. 5Let and be two sets of real numbers, where denotes the set of natural numbers. Define and . Then is equal to2021 (Session 1)Arithmetic Progression
  6. 6Let be real numbers each greater than 1 and let If , then must equal2021 (Session 1)Logarithm
  7. 7Five friends have the following hobbies : Akshay likes singing and cooking, Bharati likes singing and painting, Charu likes painting and coo2021 (Session 1)Questions on Venn Diagram
  8. 8Let be a point, different from , on the parabola whose focus is at . Let be the foot of the perpendicular drawn from on to the directrix of 2021 (Session 1)standard equation of parabola
  9. 9The number of roots of the equation in the interval is2021 (Session 1)Solving Trigonometric Equation
  10. 10Let be the set of all 6 -digit numbers, where all the digits of each number are from the set , and any digit that appears in any one of the 2021 (Session 1)Permutation
  11. 11Consider the differential equation . Then the correct statement/ statements is/are2021 (Session 1)Variable Separable Form
  12. 12Let for each . Then2021 (Session 1)Algebra of complex numbers
  13. 13Let and . Define . Then2021 (Session 1)Basic Identities & T Ratios
  14. 14Three different numbers are chosen at random from and arranged in increasing order . The probability that the resulting sequence is in arith2021 (Session 1)Combination
  15. 15Let be the MÅ‘bius function defined for positive integers by Let be positive integers . Then2021 (Session 1)Divisibility Test
  16. 16A continuous function is said to be good if given , the line segment joining the points and lies on or above the graph of in the interval . 2021 (Session 1)Monotonicity

Physics

  1. 1A body, placed in vacuum, starts cooling from the initial temperature of . Let be the time required to reduce the temperature to . Then, the2021 (Session 1)Radiation
  2. 2Water and ice having equal masses are placed inside an insulated container. The initial temperatures of water and ice are and respectively. 2021 (Session 1)Calorimetry
  3. 3Three spherical balls having mass and are placed one on top of another with their centre of masses aligned as shown in the figure below. The2021 (Session 1)Collisions
  4. 4The population of ill patients during an epidemic in a country is given by the following equation where is the initial population of ill pat2021 (Session 1)Thermodynamic Processes
  5. 5Three objects, a hollow cylinder, a solid cylinder and a solid sphere are released from the top of an inclined plane. The objects, having eq2021 (Session 1)Moment of inertia of rigid bodies
  6. 6In a photoelectric setup electrons of maximum kinetic energy 0.5 eV and 1.3 eV are liberated when ultraviolet light of wavelengths 310 nm an2021 (Session 1)Photoelectric Effect
  7. 7A wire of length and cross-sectional area has resistance . It carries a current when a voltage is applied to its ends. The wire is melted an2021 (Session 1)Resistance and Resistivity
  8. 8A long wire with a uniform linear charge density is placed along the common axis of two long coaxial thin cylindrical shells of radii and (s2021 (Session 1)Electric Potential and Potential Energy
  9. 9A jeweller examines a 1.0 cm diamond through a small magnifying glass (called a loupe) having an angular magnification of 3.5 . The near poi2021 (Session 1)Lens Formula, Refraction of light from curved surface
  10. 10A parallel beam of light, linearly polarized along the -axis, passes through a combination of convex lenses and mirrors as shown in the figu2021 (Session 1)Polarization of Light
  11. 11Consider an atomic species of atomic number and consisting of three electrons which are orbiting equally spaced in the same circular orbit. 2021 (Session 1)Bohr's Atomic Model
  12. 12An electron beam of energy 150 eV is incident normally on a Young's double slit setup. The distance between the slits is 0.1 mm and the dist2021 (Session 1)Matter Waves
  13. 13A long straight wire carries a 2.0 A current. A small rectangular coil of dimensions is placed at a distance of 2.0 m from the wire. The wir2021 (Session 1)Magnetic Field
  14. 14The variation in the atmospheric pressure with height can be estimated by balancing force due to gradient in pressure with the gravity. Assu2021 (Session 1)Thermodynamic Systems
  15. 15A particle with an initial kinetic energy approaches the origin from in the presence of a conservative potential. Consider following express2021 (Session 1)Energy
  16. 16The photon flux of a one curie gamma ray source incident on a human tissue of cross-sectional area decreases exponentially with tissue depth2021 (Session 1)Radioactivity
  17. 17The inhalation and exhalation processes of breathing are modelled using a relationship between the gauge pressure and volume of lungs as whe2021 (Session 1)First Law of Thermodynamics

Frequently Asked Questions

1.How many questions are in the NEST (NISER) 2021 Session 1 paper?

This paper has 67 questions in total - 17 from Biology, 17 from Chemistry, 16 from Mathematics, and 17 from 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) 2021 Session 2 paper is listed separately - you can switch to it from the "NEST (NISER) Paper Wise PYQs" panel, under NEST (NISER) 2021.

4.What is the structure of the NEST (NISER) 2021 Session 1 paper?

The NEST (NISER) 2021 Session 1 paper on MARKS has 67 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: 16 questions - 11 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) 2021 Session 1 paper?

Each question on MARKS carries a difficulty rating. Of the 67 rated questions in this paper, 4 (6%) are easy, 49 (73%) are medium and 14 (21%) are hard. Subject wise:

  • Biology: 0 easy, 16 medium, 1 hard
  • Chemistry: 2 easy, 12 medium, 3 hard
  • Mathematics: 2 easy, 9 medium, 5 hard
  • Physics: 0 easy, 12 medium, 5 hard
6.Which chapters had the most questions in the NEST (NISER) 2021 Session 1 paper?

The chapters with the most questions in each subject were:

  • Biology: Molecular Basis of Inheritance (4) and Principles of Inheritance and Variation (2).
  • Chemistry: Hydrocarbons (2), p Block Elements (Group 15, 16, 17 & 18) (2), and States of Matter (2).
  • Mathematics: Basic of Mathematics (3), Permutation Combination (3), and Complex Number (2).
  • Physics: Thermodynamics (3), Dual Nature of Matter (2), and Thermal Properties of Matter (2).
7.Where can I find the solutions for the NEST (NISER) 2021 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) 2021 Session 1 paper to check my preparation?

Set a timer, attempt the 67 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) 2021 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.