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COMEDK 2018

Browse the complete Chemistry, Mathematics, and Physics question set from the COMEDK 2018 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 180 questions in total - 115 easy (64%), 49 moderate (27%) and 16 tough (9%). That's an easier-than-usual mix for this exam - aim to clear it quickly and save time for the harder papers. By subject: Physics 68% easy, 23% moderate, 8% tough; Chemistry 55% easy, 35% moderate, 10% tough; Mathematics 68% easy, 23% moderate, 8% tough.

Chemistry questions were spread across 26 chapters, with Biomolecules (5), General Organic Chemistry (4), and Solutions (4) carrying the most weight. Mathematics questions were spread across 24 chapters, with Basic of Mathematics (5), Circle (5), and Indefinite Integration (5) carrying the most weight. Physics questions were spread across 19 chapters, with Current Electricity (6), Nuclear Physics (6), and Wave Optics (6) carrying the most weight.

Chemistry

  1. 1Which of the following is not an ore of magnesium?2018Minerals and ores
  2. 2The atomic numbers of and Cu are 28 and 29 respectively. The electron configuration represents2018Properties of D-block elements
  3. 3In the following, the element with the highest ionisation energy is2018Periodic properties
  4. 4In the conversion of to , the oxidation number of Br changes from2018Oxidation number
  5. 5Among the alkali metals caesium is the most reactive because2018General Characteristics of Alkali Metals
  6. 6Which of the following represents the Lewis structure of molecule?2018Theories of Acids and Bases
  7. 7Hydrogen bond is strongest in2018Van Der Waals Forces, Hydrogen Bonding and Metallic Bonding
  8. 8The decomposition of a certain mass of gave of gas at . The mass of required to completely neutralise the gas is2018Quantitative measures in chemical equations
  9. 9The density of a gas is at and Hg. The gas is2018Gas laws and Ideal Gas Equation
  10. 10mole of solid is added to of water at . The enthalpy of solution is . After the solute is dissolved the temperature of the solution will be2018Laws of Thermochemistry and Enthalpy Change
  11. 114 moles each of and gases are allowed to react to form in a closed vessel. At equilibrium of is used up. The total number of moles of all th2018Quantitative measures in chemical equations
  12. 12An example for auto-catalysis is2018Catalysis and Theories of Catalysis
  13. 13During the fusion of an organic compound with sodium metal, nitrogen of the compound is converted into2018Compounds of Alkali Metals
  14. 14Identify the product in the following reaction sequence2018Properties and Preparation of Alkanes
  15. 15The reaction is known as2018Preparation of Ethers
  16. 16plot in the Eliingham's diagram, slopes downwards for the reaction2018Reduction to Crude Metal
  17. 17Which of the following reaction taking place in the blast furnace is endothermic?2018Reduction to Crude Metal
  18. 18Liquor ammonia bottles are opened only after cooling. This is because2018Vapour pressure and raoult's law
  19. 19The formation of is basis for the formation of xenon fluorides. This is because2018Noble Gases
  20. 20The highest magnetic moment is shown by the transition metal ion with the configuration2018Properties of D-block elements
  21. 21A transition metal ion exists in its highest oxidation state. It is expected to behave as2018Properties of D-block elements
  22. 22In which of the following complex ion, the central metal ion is in a state of hybridisation?2018Werner's theory and Valence Bond Theory
  23. 23Which of the following can participate in linkage isomerism?2018Isomerism of coordination compounds
  24. 24Which of the following has the highest bond order?2018Molecular Orbital Theory
  25. 25Which of the following is diamagnetic?2018Molecular Orbital Theory
  26. 26The concentration of a reactant decreases from 0.1 to in . If the reaction follows I order kinetics, the rate of the reaction when the conce2018Rate law and rate constant
  27. 27Chemical reactions with very high values are generally2018Arrhenius theory
  28. 28Which of the following does not conduct electricity?2018Electrical and Magnetic properties
  29. 29When a quantity of electricity is passed through solution, of copper gets deposite(d)If the same quantity of electricity is passed through a2018Cells and Electrode Potential, Nernst Equation
  30. 30Solubility product of a salt is in a solution in which the concentration of ions is . The salt will precipitate when the concentration of io2018Solubility
  31. 31Which one of the following condition will increase the voltage of the cell represented by the equation.2018Cells and Electrode Potential, Nernst Equation
  32. 32The of solution is2018PH of solutions
  33. 33The mass of glucose that should be dissolved in of water in order to produce the same lowering of vapour pressure as is produced by dissolvi2018Colligative Properties and Abnormal Molecular Masses
  34. 34Osmotic pressure observed when benzoic acid is dissolved in benzene is less than that expected from theoretical considerations. This is beca2018Colligative Properties and Abnormal Molecular Masses
  35. 35For a reaction to be spontaneous at all temperatures2018Third law of thermodynamics
  36. 36Which of the following electrolyte will have maximum flocculation value for sol??2018Properties of colloidal solution
  37. 37For a reversible reaction, the standard entropies of and are 60,40 and respectively. The temperature at which the above reaction attains equ2018Third law of thermodynamics
  38. 38The radii of and ions are 95 pin and 181 pm respectively. The edge length of unit cell is2018Crystal Structure of Solids
  39. 39Inductive effect involves2018Electron displacement effects
  40. 40The basicity of aniline is less than that of cyclohexylamine. This is due to2018Conjugation and Aromaticity
  41. 41Methyl bromide is converted into ethane by heating it in ether medium with2018Properties and Preparation of Alkanes
  42. 42Which of the following compound is expected to be optically active?2018Isomerism of Organic Compounds
  43. 43Which cycloalkane has the lowest heat of combustion per group?2018Laws of Thermochemistry and Enthalpy Change
  44. 44- The catalyst used in the preparation of an alkyl chloride by the action of dry on an alcohol is2018Preparation and Properties of Monohalides
  45. 45In the reaction, , the product is2018Preparation and Properties of Carboxylic Acids
  46. 46Which of the following compound would not evolve when treated with solution?2018Bond Cleavage
  47. 47By heating phenol, with chloroform in alkali, it is converted into2018Reactions of Phenol
  48. 48- When a mixture of calcium benzoate and calcium acetate is dry distilled, the resulting compound is2018Method of preparation for both aldehydes and ketones
  49. 49Which of the following does not give benzoic acid on hydrolysis?2018Preparation and Properties of Carboxylic Acids
  50. 50Which of the following would undergo Hofmann reaction to give a primary amine?2018Preparation and Properties of Amines
  51. 51Glucose contains in addition to aldehyde group2018Carbohydrates
  52. 52A distinctive and characteristic functional group of fats is2018Fats
  53. 53At glycine exists as2018Properties and Preparation of Amino Acids
  54. 54Insulin regulates the metabolism of2018Proteins
  55. 55The formula mass of Mohr's salt is . The iron present in it is oxidised by in acid medium. The equivalent mass of Mohr's salt is2018Concentration terms
  56. 56The brown ring test for nitrates depends on2018Radicals
  57. 57Acrolein test is positive for2018Fats
  58. 58An organic compound which produces a bluish green coloured flame on heating in presence of copper is2018Preparation and Properties of Aryl Halides
  59. 59For a reaction, , If the concentration of is doubled without altering the concentration of , the rate gets double(d)If the concentration of 2018Methods to determine order of reaction
  60. 60Which of the following solutions will exhibit highest boiling point?2018Colligative Properties and Abnormal Molecular Masses

Mathematics

  1. 1If , and , then is2018Product of 2 vectors
  2. 2The volume of the tetrahedron formed by the points and in cubic units is2018Scalar Triple Product
  3. 3Unit vector perpendicular to and lying in the plane containing and is2018Algebra of Vectors
  4. 4In the group under the binary operation * defined by the inverse of 10 is2018Mathematical Reasoning
  5. 5In the group under multiplication2018Mathematical Reasoning
  6. 6The group has2018Mathematical Reasoning
  7. 7If , then2018Mathematical Reasoning
  8. 8The argument of the complex number is2018Conjugate, modulus and argument
  9. 9The maximum value of , such that is2018Power of iota
  10. 10The value of is2018Algebra of complex numbers
  11. 11All complex number which satisfy the equation lie on the2018Locus Based on Distance Formula
  12. 12The value of is2018Converting one Inverse T function to other Inverse T
  13. 13The value of for which the function is the inverse of itself is2018Inverse of a Function
  14. 14If occurs is the expansion of , then its coefficient is2018Terms of Binomial Expansion
  15. 15If and , then2018Basic Identities & T Ratios
  16. 16Preview not available - open to view this question.2018Basic Identities & T Ratios
  17. 17If and are in , then is2018Geometric Progression
  18. 18If , then2018Ratio and Proportion
  19. 19If , then2018Logarithm
  20. 20If , and are the roots of the equation , then is equal to2018Relation between Roots and Coefficients
  21. 21If are binomial coefficients of order , then the value of2018Properties of Binomial Coefficients
  22. 22The value of is2018Logarithm
  23. 23If , then the number of possiblc bijection from to is2018Inverse of a Function
  24. 24Preview not available - open to view this question.2018T inverse T property
  25. 25If then the general solution is2018Basic Identities & T Ratios
  26. 26If a circle with the point as its center touches the straight line , then the coordinates of the points of contact is2018line and circle
  27. 27If the circles and touch each other, then2018Family of Circle
  28. 28The number of common tangents to the circles and is2018Common Tangents
  29. 29The length of the tangent drawn from any point on the circle to the circle is2018Tangent to circle
  30. 30If the foci of the ellipse and the hyperbola coincide, then the value of is2018General Equation of 2nd degree curve
  31. 31The latusrectum of the ellipse is half the minor axis. Then, its eccentricity is2018General Equation of 2nd degree curve
  32. 32The ends of the latusrectum of the parabola are2018General Equation of 2nd degree curve
  33. 33Which of the following functions is differentiable at ?2018Differentiability
  34. 34If , then2018Parametric differentiation
  35. 35If then2018Product of Matrices
  36. 36If , then is2018Product of Matrices
  37. 37If are the roots of the equation , then the value of the determinant is2018Relation between Roots and Coefficients
  38. 38The number of distinct real roots of in the interval is2018Expansion of Determinants
  39. 39The sum of non-prime positive divisors of 450 is2018Remainder and Divisibility Problems
  40. 40The last digit of is2018Summation of Series
  41. 41The interval such that is given by2018Miscellaneous
  42. 42Preview not available - open to view this question.2018Properties of Definite Integration
  43. 43The value of depends on the2018Properties of Definite Integration
  44. 44The area of the region bound by the curves and is2018Area bounded by two curves
  45. 45The particular solution of , when is2018Fundamental of Indefinite Integration
  46. 46-The solution of the differential equation is2018Integration by Substitution
  47. 47The maximum value of is2018Logarithm
  48. 48Let be a number which exceeds its square by the greatest possible quantity, then2018Maxima Minima
  49. 49The subtangent at on the curve is2018Tangent Normal
  50. 50The value of is2018Miscellaneous Forms
  51. 51Preview not available - open to view this question.2018Miscellaneous Forms
  52. 52Preview not available - open to view this question.2018Miscellaneous Forms
  53. 53The locus of the mid-point of the intercept of the line between the coordinate axes is2018Locus
  54. 54If the line through is inelined at an angle with the positive direction of the -axis, then the coordinates of the two points on opposite sid2018Coordinate System
  55. 55If the line coincides with one of the lines given by , then2018Concurrency & Family of Lines
  56. 56The function is undefined at . The value which should be assigned to at so that it is continuous at is2018Continuity
  57. 57Preview not available - open to view this question.2018Algebraic and Rational Limits
  58. 58The number of triangles in a complete graph with 10 non-collinear vertices is2018Combination
  59. 59The angle between hands of a clock when the time is is signed to2018Inequalities
  60. 60The point lies outside the circle2018Position of point

Physics

  1. 1A ray of light enters from a rarer to a denser medium. The angle of incidence is . Then, the reflected and refracted rays are mutually perpe2018Critical angle and total internal reflection
  2. 2A fish in water (refractive index ) looks at a bird vertically above in the air. If is the height of the bird and is the depth of the fish f2018Refraction of light from plane surface
  3. 3Figure shows a mixture of blue, green and red coloured rays incident normally on a right angled prism. The critical angles of the material o2018Critical angle and total internal reflection
  4. 4A convex and a concave lens separated by distance are then put in contact. The focal length of the combination2018Combination of Lens and Mirrors
  5. 5A convex lens is made of 3 layers of glass of 3 different materials as in the figure. A point object is placed on its axis. The number of im2018Combination of Lens and Mirrors
  6. 6If is permeability of free space and is permittivity of free space, then the speed of light in vacuum is given by2018Electromagnetic Waves and Maxwell's equations
  7. 7In Young's double slit experiment, a third slit is made in between the double slits. Then,2018Youngs Double Slit Experiment
  8. 8The maximum number of possible interference maxima when slit separation is equal to 4 times the wavelength of light used in a double slit ex2018Youngs Double Slit Experiment
  9. 9In a Fraunhofer diffraction experiment at a single slit using a light of wavelength , the first minimum is formed at an angle of . The direc2018Diffraction of Light
  10. 10Maximum diffiaction takes place in a given shit for2018Diffraction of Light
  11. 11An unpolarised beam of intensity falls on a polaroi(d)The intensity of the emergent light is2018Polarization of Light
  12. 12Which of the following is a dichroic crystal?2018Polarization of Light
  13. 13Two identieal metal spheres charged with and are kept at certain distance in air. They are brought into contact and then kept at the same di2018Electric Charge and Coulomb's law
  14. 14A small conducting sphere of radius is lying concentrically inside a bigger hollow conducting sphere of radius . The bigger and smaller sphe2018Electric Potential and Potential Energy
  15. 15The charges and are placed at the vertices of an equilateral triangle of side . If the net electrostatic potential energy of the system is z2018Electric Potential and Potential Energy
  16. 16How many condensers are needed to make a condenser of ?\2018Grouping of capacitors
  17. 17The total energy stored in the condenser system shown in the figure will be2018Force and Energy stored in capacitor
  18. 18A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the el2018Electric Current and Drift of Electrons
  19. 19The equivalent resistance between the points and will be (each resistance is )2018Resistance and Resistivity
  20. 20The terminals of a battery with an internal resistance of are connected to a circular wire of resistance at two points distant at one quarte2018Electric Current and Drift of Electrons
  21. 21The potential difference between and in the following figure is2018Electric Cell or Battery
  22. 22The magnetic field at the centre of a circular current carrying conductor of radius is . The magnetic field on its axis at a distance from t2018Biot-Savart's Law and Ampere's Circuital Law
  23. 23Current is flowing in a conductor shaped as shown in the figure. The radius of the curved part is and the length of straight portion is very2018Biot-Savart's Law and Ampere's Circuital Law
  24. 24Two tangent galvanometers and are identical except in their number of turns. They are connected in series. On passing a current through them2018Electric Instruments
  25. 25The resultant force on the current loop due to a long current carrying conductor will be2018Force and Torque on Current Carrying Conductor
  26. 26A certain current on passing through a galvanometer produces a deflection of 100 divisions. When a shunt of one ohm is connected, then the d2018Electric Instruments
  27. 27Two similar circular loops carry equal currents in the same direction. On moving the coils further apart, the electric current will2018Induced Electric Field
  28. 28The value of alternating emf in the given circuit will be2018Alternating Current, Voltage and Power
  29. 29A current of is flowing at in the primary coil of a transformer. If the voltage produced in the secondary coil is and of power is lost, then2018Transformers
  30. 30For a series circuit at resonance, the statement which is not true ?2018AC Circuits
  31. 31- Solar spectrum is an example for2018Electromagnetic Spectrum
  32. 32When a piece of metal is illuminated by a monochromatic light of wavelength , then stopping potential is . When same surface is illuminated 2018Photoelectric Effect
  33. 33The maximum kinetic energy of emitted electrons in a photoelectric effect does not depend upon2018Photoelectric Effect
  34. 34The ratio of minimum wavelength of Lyman and Balmer series will be2018Atomic Spectrum
  35. 35Hydrogen atom does not emit X-rays because2018Atomic Spectrum
  36. 36If an electron and a proton have the same de-Broglie wavelength, then the kinetic energy of the electron is2018Matter Waves
  37. 37Two protons are kept at a separation of is the nuclear force and is the electrostatic force between them. Then,2018Nuclear structure
  38. 38Blue colour of sea water is due to2018Electromagnetic Spectrum
  39. 39The ratio of the nuclear radii of elements with mass numbers 216 and 125 is2018Nuclear structure
  40. 40On bombarding by slow neutron, energy is release(d)If the power output of atomic reactor is , then the rate of fission will be2018Nuclear reactions
  41. 41The masses of two radioactive substances are same and their half-lives are 1 year and 2 years, respectively. The ratio of their activities a2018Radioactivity
  42. 42undergoes successive disintegrations with the end product of . The number of and particles emitted are2018Radioactivity
  43. 43The most stable particle in Baryon group is2018Nuclear structure
  44. 44In an unbiased - junction2018Diodes
  45. 45To get an output from the circuit shown, the inputs and must be respectively2018Logic gates
  46. 46Dimensional formula for the universal gravitational constant is2018Dimensions
  47. 47A body is projected vertically upwards. The times corresponding to height , while ascending and descending are and , respectively. Then, the2018Motion Under Gravity
  48. 48A mass of is suspended from a spring balance. It is pulled a side by a horizontal string, so that it makes an angle of with the vertical. Th2018Spring force
  49. 49A body weight in air and in water. How much would it weight in a liquid of specific gravity ?2018Newton's laws of motion
  50. 50A body of mass is accelerated upon by a constant force, travels a distance of in the 1st second and a distance of in the secon(d)The force a2018Newton's laws of motion
  51. 51A simple pendulum is suspended from the ceiling of a lift. When the lift is at rest its time period is T. With what acceleration should the 2018Motion Under Gravity
  52. 52If is the ratio of specific heats and is the universal gas constant, then the molar specific heat at constant volume is given by2018Calorimetry
  53. 53An ideal gas is taken via path as shown in figure. The network done in the whole cycle is2018First Law of Thermodynamics
  54. 54In which of the processes, does the internal energy of the system remain constant?2018Thermodynamic Systems
  55. 55The coefficient of thermal conductivity of copper is 9 times that of steel. In the composite cylindrical bar shown in the figure, what will 2018Conduction
  56. 56The equation of a simple harmonic wave is given by , where and are in and is in seconds. The phase difference between two particles apart at2018Travelling Waves
  57. 57With what velocity should an observer approach a stationary sound source, so that the apparent frequency of sound should appear double the a2018Doppler's Effect
  58. 58If a black body emits of energy per second when it is at , then the amount of energy emitted by it when it is at will be2018Radiation
  59. 59A string vibrates with a frequency of . When its length is doubled and tension is altered, it begins to vibrate with a frequency of . The ra2018Vibration of String
  60. 60How many times more intense is a sound than a sound?2018Properties of Sound Waves

Frequently Asked Questions

1.How many questions are in the COMEDK 2018 paper?

This paper has 180 questions in total - 60 each from Chemistry, Mathematics, and Physics.

2.Can I practise questions from just one subject?

Yes. Use the 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 COMEDK 2018 paper?

The COMEDK 2018 paper on MARKS has 180 questions, organised by subject:

  • Chemistry: 60 questions - 60 single-correct.
  • Mathematics: 60 questions - 60 single-correct.
  • Physics: 60 questions - 60 single-correct.
4.What is the difficulty level of the COMEDK 2018 paper?

Each question on MARKS carries a difficulty rating. Of the 180 rated questions in this paper, 115 (64%) are easy, 49 (27%) are medium and 16 (9%) are hard. Subject wise:

  • Chemistry: 33 easy, 21 medium, 6 hard
  • Mathematics: 41 easy, 14 medium, 5 hard
  • Physics: 41 easy, 14 medium, 5 hard
5.Which chapters had the most questions in the COMEDK 2018 paper?

The chapters with the most questions in each subject were:

  • Chemistry: Biomolecules (5), General Organic Chemistry (4), and Solutions (4).
  • Mathematics: Basic of Mathematics (5), Circle (5), and Indefinite Integration (5).
  • Physics: Current Electricity (6), Nuclear Physics (6), and Wave Optics (6).
6.Where can I find the solutions for the COMEDK 2018 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 COMEDK 2018 paper to check my preparation?

Set a timer, attempt the 180 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 COMEDK. Repeating this with other papers shows whether the same weak spots keep coming back.

8.Will the COMEDK 2018 paper help me prepare for COMEDK 2027?

Yes. Every past paper shows the question styles and topics COMEDK 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.