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IAT (IISER) 2023

Browse the complete Biology, Chemistry, Mathematics, and Physics question set from the IAT (IISER) 2023 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 60 questions in total - 19 easy (32%), 35 moderate (58%) and 6 tough (10%). That's a fairly typical mix for this exam. By subject: Biology 33% easy, 60% moderate, 7% tough; Chemistry 53% easy, 47% moderate, 0% tough; Mathematics 20% easy, 67% moderate, 13% tough; Physics 20% easy, 60% moderate, 20% tough.

Biology questions were spread across 12 chapters, with Biomolecules (B) (2), Molecular Basis of Inheritance (2), and Principles of Inheritance and Variation (2) carrying the most weight. Chemistry questions were spread across 13 chapters, with General Organic Chemistry (2), General Principles and Processes of Isolation of Metals (2), and Biomolecules (1) carrying the most weight. Mathematics questions were spread across 13 chapters, with Definite Integration (2), Quadratic Equation (2), and Application of Derivatives (1) carrying the most weight. Physics questions were spread across 12 chapters, with Current Electricity (2), Motion In One Dimension (2), and Units and Dimensions (2) carrying the most weight.

Biology

  1. 1Match the entries in Column I with their functions described in Column II. Which one of the following combinations is correct?2023Epithelial Tissue
  2. 2Which one of the following best describes peptones?2023Introduction
  3. 3Match the biomolecules given in Column I with their corresponding chemical nature given in Column II. Which one of the following combination2023Protein
  4. 4A mitotic drug inhibits microtubule formation. Which one of the following stages of karyokinesis will be the first to get affected by the dr2023M-phase (Mitotic Phase)
  5. 5Which one of the following statements regarding seed structure is INCORRECT?2023The Seed
  6. 6Which one of the following anatomical features of wood can be used to estimate the age of a tree growing in a temperate climate?2023Secondary Growth
  7. 7Which one of the following statements is CORRECT about biological nitrogen fixation in plants?2023Nitrogen Metabolism
  8. 8Which one of the following is an example of genetic diversity?2023Levels of Biodiversity
  9. 9When the ribosome encounters a stop codon in the mRNA, during translation, which one of the following binds to the stop codon?2023Translation
  10. 10Match the terms in column I with their corresponding physiological roles given in Column II. Which one of the following combinations is corr2023Male Reproductive System
  11. 11For which one of the following diseases does the causative agent require the splicing of their hnRNA to generate mature mRNA?2023Transcription
  12. 12The diagram represents an enzyme, its substrate and potential inhibitors (P, Q, R, S, T). Which one of the following combinations is the bes2023Enzymes
  13. 13In an island with 10,000 individuals, four have sickle cell anemia, a recessive autosomal disease. Assuming that the locus is in Hardy-Weinb2023Mendel's Work and Results
  14. 14A 1000 base-pair DNA fragment was cloned between Hind III and EcoR I sites of the plasmid vector (pIAT) of size 3500 base-pair. The cloned f2023Tools of Recombinant DNA Technology
  15. 15The following pedigree chart shows the inheritance of a genetic disorder. I-2 and III-2 are the only affected individuals. Which one of the 2023Genetic Disorders

Chemistry

  1. 1How many radial nodes does have in its 4 s orbital?2023Quantum mechanical model
  2. 2Amongst , and , which molecules will be attracted to an external magnetic field?2023Molecular Orbital Theory
  3. 3What is the smallest bond angle in the highly reactive allotrope of phosphorus?2023Phosphorus and Its Compounds
  4. 4Which of the following is an ore of iron?2023Minerals and ores
  5. 5Which parameters are plotted in the Ellingham diagram?2023Reduction to Crude Metal
  6. 6Which of the following compounds will NOT undergo the Finkelstein reaction with NaI via pathway?2023Preparation and Properties of Monohalides
  7. 7Which one amongst the following is the most efficient way of synthesizing -propyl benzene?2023Reactions of aromatic compounds
  8. 8Which amongst the following are chiral compounds?2023Isomerism of Organic Compounds
  9. 9Which one amongst the following bases is NOT present in RNA?2023Nucleic Acids
  10. 10Which amongst the following are aromatic?2023Conjugation and Aromaticity
  11. 11Why is it harder to compress liquids and solids relative to gases?2023Liquid State
  12. 12Related to the Freundlich adsorption isotherm, which one of the following statements is NOT correct?2023Adsorption isotherms
  13. 13Consider the following reaction: Which of the statements is FALSE?2023Laws of Thermochemistry and Enthalpy Change
  14. 14In two solutions X (hexane and benzene) and Y (water and HCl ), what types of deviations from Raoult's law are observed?2023Vapour pressure and raoult's law
  15. 15In aqueous solution, the hydronium ion gets further hydrated to give which of the following species?2023Ionic Product of Water

Mathematics

  1. 1Let be a continuous decreasing function. Suppose are in a geometric progression with common ratio . In which of the following intervals does2023Properties of Definite Integration
  2. 2Let be a matrix with real entries such that What is the value of the determinant of ?2023System of Linear Equations
  3. 3What is the locus of the center of circles passing through the origin with fixed radius?2023Locus
  4. 4Let be a real number. What is the total number of distinct point(s) of intersection between the parabola and the pair of lines2023Relation between Roots and Coefficients
  5. 5Let be a straight line passing through the origin, and it makes angles , and with the positive and -axes, respectively. What is the value of2023Direction Cosines and Direction Ratios
  6. 6What is the total number of distinct divisors of2023Selection of one or more item
  7. 7Suppose the mean and the standard deviation of the data are and , respectively. After including one more data value , the mean of the data r2023Statistics
  8. 8Consider three biased coins. Let the probability of getting head be and the probability of getting tail be in each of the coins. Consider th2023Conditional Probability and Multiplication Theorem
  9. 9Which of the following differential equations has as one of its particular solutions?2023Order and Degree
  10. 10What is the area of the region2023Area of Curve along axis
  11. 11Consider the objective function subject to the constraints: What is the minimum value of subject to the above constraints?2023Linear Programming
  12. 12Let be a quadratic polynomial with real coefficients and . Suppose and . What is the product of the roots of ?2023Relation between Roots and Coefficients
  13. 13Let be a differentiable function such that and Then in which of the following intervals does lie?2023Properties of Definite Integration
  14. 14Let . Which of the following statements is true?2023Monotonicity
  15. 15Which one of the following functions is differentiable at ?2023Differentiability

Physics

  1. 1A ball is thrown vertically upwards with an initial speed from a height above the ground. The ball eventually hits the ground with a speed .2023Rest and Motion
  2. 2Two cubes A and B of same dimensions are made of different materials with densities and , respectively. Cube A floats in water with a fracti2023Archmidies Principle
  3. 3An object is placed in front of a convex lens. A real inverted image of double its size is formed. When the object is moved closer to the le2023Lens Formula, Refraction of light from curved surface
  4. 4The frequency of the whistle of a train moving with a constant speed is observed by a stationary detector on the platform to be . The freque2023Doppler's Effect
  5. 5A current flows through a cylindrical cable of length and uniform cross-sectional area . The power dissipated due to the current is . The ca2023Electric Power and Heating Effect of Current
  6. 6Particle A with charge and particle B with charge are fixed at positions and , respectively. The force on A due to B is , and that on B due 2023Electric Charge and Coulomb's law
  7. 7The magnetic flux through a coil at a time is given by , where and is a non-zero constant. At what time is the magnitude of the induced emf 2023Magnetic Flux, Faraday's and Lenz law
  8. 8The intrinsic electron and hole concentrations of a Si-based intrinsic semiconductor are and , respectively. Upon doping with trivalent impu2023Semiconductors
  9. 9The velocity of a particle moving in one dimension is given by: where is a constant. What is the total displacement of the particle from tim2023Uniform Motion
  10. 10Two fixed point particles, each of charge , are separated by a distance . Another point charge of mass is oscillating about its equilibrium 2023Dimensions
  11. 11What is the effective resistance between A and B in the circuit shown below?2023Combination of Resistances
  12. 12Two spherical bodies A and B each of mass and radius are located such that their centers are apart by a distance of as shown in the figure. 2023Gravitational potential and Potential Energy
  13. 13Consider the Bohr model of an atom where an electron of charge revolves around a nucleus of charge in an orbit of radius . The electron has 2023Bohr's Atomic Model
  14. 14A quantity has been measured to have a value of 0.00230 in some units. How many significant figures does the measured value have?2023Dimensions
  15. 15Consider a Carnot heat engine operating between a heat reservoir at temperature 600 K , and an external atmosphere at temperature 300 K . In2023Heat Engine, Refrigerator and Second Law of Thermodynamics

Frequently Asked Questions

1.How many questions are in the IAT (IISER) 2023 paper?

This paper has 60 questions in total - 15 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.What is the structure of the IAT (IISER) 2023 paper?

The IAT (IISER) 2023 paper on MARKS has 60 questions, organised by subject:

  • Biology: 15 questions - 15 single-correct.
  • Chemistry: 15 questions - 15 single-correct.
  • Mathematics: 15 questions - 15 single-correct.
  • Physics: 15 questions - 15 single-correct.
4.What is the difficulty level of the IAT (IISER) 2023 paper?

Each question on MARKS carries a difficulty rating. Of the 60 rated questions in this paper, 19 (32%) are easy, 35 (58%) are medium and 6 (10%) are hard. Subject wise:

  • Biology: 5 easy, 9 medium, 1 hard
  • Chemistry: 8 easy, 7 medium, 0 hard
  • Mathematics: 3 easy, 10 medium, 2 hard
  • Physics: 3 easy, 9 medium, 3 hard
5.Which chapters had the most questions in the IAT (IISER) 2023 paper?

The chapters with the most questions in each subject were:

  • Biology: Biomolecules (B) (2), Molecular Basis of Inheritance (2), and Principles of Inheritance and Variation (2).
  • Chemistry: General Organic Chemistry (2) and General Principles and Processes of Isolation of Metals (2).
  • Mathematics: Definite Integration (2) and Quadratic Equation (2).
  • Physics: Current Electricity (2), Motion In One Dimension (2), and Units and Dimensions (2).
6.Where can I find the solutions for the IAT (IISER) 2023 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.

7.How should I use the IAT (IISER) 2023 paper to check my preparation?

Set a timer, attempt the 60 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 IAT (IISER). Repeating this with other papers shows whether the same weak spots keep coming back.

8.Will the IAT (IISER) 2023 paper help me prepare for IAT (IISER) 2027?

Yes. Every past paper shows the question styles and topics IAT (IISER) 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.