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NEET2018Paper 2018

NEET 2018 — Paper 2018

180 questions with step-by-step solutions. All free.

Physics

  1. Q1In the combination of the following gates the output Y can be written in terms of inputs A and B as
  2. Q2In the circuit shown in the figure, the input voltage Vi is 20 V, VBE = 0 and VCE = 0. The values of IB , IC and   are given by
  3. Q3 A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from …
  4. Q4 Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is …
  5. Q5 An inductor 20 mH, a capacitor 100 and a resistor 50 are connected in series across a source of emf, V = 10 sin 314 t. The power loss in the circuit is …
  6. Q6 A metallic rod of mass per unit length 0.5 kg m–1 is lying horizontally on a smooth inclined plane which makes an angle of 30° with the horizontal. The rod is not allowed to slide down by flowing a current through it when a magnetic field of induction 0.25 T is acting on it in the vertical direction. The current flowing in the rod to keep it stationary is …
  7. Q7 The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is …
  8. Q8The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is
  9. Q9 The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to state B, is …
  10. Q10 At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth's atmosphere? (Given : Mass of oxygen molecule (m) = 2.76 × 10–26 kg Boltzmann's constant kB = 1.38 × 10–23 JK–1) …
  11. Q11 The refractive index of the material of a prism is   and the angle of the prism is  
  12. Q12 An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be …
  13. Q13 When the light of frequency 2 (where  
  14. Q14The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is
  15. Q15 For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is …
  16. Q16 An electron of mass m with an initial velocity  
  17. Q17An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
  18. Q18 In Young's double slit experiment the separation d between the slits is 2 mm, the wavelength   of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20°. To increase the fringe angular width to 0.21° (with same   and D) the separation between the slits needs to be changed to …
  19. Q19 Unpolarised light is incident from air on a plane surface of a material of refractive index ' '. At a particular angle of incidence 'i', it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation? …
  20. Q20In a p-n junction diode, change in temperature due to heating
  21. Q21 The power radiated by a black body is P and it radiates maximum energy at wavelength,   . If the temperature of the black body is now changed so that it radiates maximum energy at wavelength  
  22. Q22 A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic oscillator. The acceleration of the bob of the pendulum is 20 m/s2 at a distance of 5 m from the mean position. The time period of oscillation is …
  23. Q23 An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is …
  24. Q24The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is
  25. Q25 A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27ºC two successive resonances are produced at 20 cm and 73 cm of column length. If the frequency of the tuning fork is 320 Hz, the velocity of sound in air at 27ºC is …
  26. Q26 A carbon resistor of   is to be marked with rings of different colours for its identification. The colour code sequence will be …
  27. Q27 A set of 'n' equal resistors, of value 'R' each, are connected in series to a battery of emf 'E' and internal resistance 'R'. The current drawn is I. Now, the 'n' resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10 I. The value of 'n' is …
  28. Q28 A battery consists of a variable number 'n' of identical cells (having internal resistance 'r' each) which are connected in series. The terminals of the battery are short-circuited and the current I is measured. Which of the graphs shows the correct relationship between I and n? …
  29. Q29 The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This inductor is of inductance …
  30. Q30 An em wave is propagating in a medium with a velocity 
  31. Q31 Three objects, A : (a solid sphere), B : (a thin circular disk) and C : (a circular ring), each have the same mass M and radius R. They all spin with the same angular speed   about their own symmetry axes. The amounts of work (W) required to bring them to rest, would satisfy the relation …
  32. Q32 A body initially at rest and sliding along a frictionless track from a height h (as shown in the figure) just completes a vertical circle of diameter AB = D. The height h is equal to …
  33. Q33 A moving block having mass m, collides with another stationary block having mass 4m. The lighter block comes to rest after collision. When the initial velocity of the lighter block is v, then the value of coefficient of restitution (e) will be …
  34. Q34 A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field . Due to the force p
  35. Q35 A block of mass m is placed on a smooth inclined wedge ABC of inclination  as shown in the figure. The wedge is given an acceleration 'a' towards the right. The relation between a and  for the block to remain stationary on the wedge is …
  36. Q36 A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of –0.004 cm, the correct diameter of the ball is …
  37. Q37The moment of the force,   at (2, 0, –3), about the point (2, –2, –2), is given by
  38. Q38 A sample of 0.1 g of water at 100°C and normal pressure (1.013 × 105 Nm–2) requires 54 cal of heat energy to convert to steam at 100°C. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample, is …
  39. Q39 A small sphere of radius 'r' falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity, is proportional to …
  40. Q40 Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by   on applying a force F, how much force is needed to stretch the socond wire by the same amount? …
  41. Q41 The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A, B and C are KA, KB and KC , respectively. AC is the major axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure. Then …
  42. Q42 If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct? …
  43. Q43 A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere? …
  44. Q44 A solid sphere is in rolling motion. In rolling motion a body possesses translational kinetic energy (Kt ) as well as rotational kinetic energy (Kr ) simultaneously. The ratio Kt : (Kt + Kr ) for the sphere is …
  45. Q45Which one of the following statements is incorrect?

Chemistry

  1. Q1 Given van der Waals constant for NH3, H2, O2 and CO2 are respectively 4.17, 0.244, 1.36 and 3.59, which one of the following gases is most easily liquefied? …
  2. Q2Which of the following statements is not true for halogens?
  3. Q3The correct order of N-compounds in its decreasing order of oxidation states is
  4. Q4In the structure of ClF3, the number of lone pairs of electrons on central atom ‘Cl’ is
  5. Q5The correct order of atomic radii in group 13 elements is
  6. Q6Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
  7. Q7On which of the following properties does the coagulating power of an ion depend?
  8. Q8 The solubility of BaSO4 in water is 2.42 × 10–3 g L–1at 298 K. The value of its solubility product (Ksp) will be (Given molar mass of BaSO4= 233 g mol–1) …
  9. Q9 Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations : a. 60 mL  
  10. Q10Which of the following molecules represents the order of hybridisation sp2, sp2, sp, sp from left to right atoms?
  11. Q11 Compound A, C8H10O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with characteristic smell. A and Y are respectively …
  12. Q12Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their
  13. Q13In the reaction  The electrophile involved is
  14. Q14 A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4. The evolved gaseous mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be …
  15. Q15The difference between amylose and amylopectin is
  16. Q16Which of the following oxides is most acidic in nature?
  17. Q17Nitration of aniline in strong acidic medium also gives m-nitroaniline because
  18. Q18Regarding cross-linked or network polymers, which of the following statements is incorrect?
  19. Q19Which one of the following elements is unable to form  ion?
  20. Q20In which case is number of molecules of water maximum?
  21. Q21Among CaH2, BeH2, BaH2, the order of ionic character is
  22. Q22The correct difference between first and second order reactions is that
  23. Q23The geometry and magnetic behaviour of the complex [Ni(CO)4] are
  24. Q24Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :
  25. Q25Iron carbonyl, Fe(CO)5is
  26. Q26Which one of the following ions exhibits d-d transition and paramagnetism as well?
  27. Q27The type of isomerism shown by the complex [CoCl2(en)2] is
  28. Q28Which of the following is correct with respect to – I effect of the substituents? (R = alkyl)
  29. Q29Which of the following carbocations is expected to be most stable?
  30. Q30Which one is a wrong statement?
  31. Q31Consider the following species : CN+, CN–, NO and CN Which one of these will have the highest bond order?
  32. Q32 Iron exhibits bcc structure at room temperature. Above  , it transforms to fcc structure. The ratio of density of iron at room temperature to that at  
  33. Q33 Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s22s22p3, the simplest formula for this compound is …
  34. Q34The correction factor ‘a’ to the ideal gas equation corresponds to
  35. Q35Which one of the following conditions will favour maximum formation of the product in the reaction,  ?
  36. Q36For the redox reaction The correct coefficients of the reactants for the balanced equation are
  37. Q37When initial concentration of the reactant is doubled, the half-life period of a zero order reaction
  38. Q38 The bond dissociation energies of X2, Y2 and XY are in the ratio of 1 : 0.5 : 1. ΔH for the formation of XY is –200 kJ mol–1. The bond dissociation energy of X2will be …
  39. Q39 Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below : Then the species undergoing disproportionation is …
  40. Q40Identify the major products P, Q and R in the following sequence of reactions :
  41. Q41Which of the following compounds can form a zwitterion?
  42. Q42The compound C7H8 undergoes the following reactions: The product 'C' is 
  43. Q43 The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether. A, B and C are in the order …
  44. Q44 Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gaseous hydrocarbon containing less than four carbon atoms. (A) is …
  45. Q45Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?

Biology

  1. Q1Select the correct statement
  2. Q2Select the correct match
  3. Q3The experimental proof for semiconservative replication of DNA was first shown in a
  4. Q4Select the wrong statement :
  5. Q5Secondary xylem and phloem in dicot stem are produced by
  6. Q6Casparian strips occur in
  7. Q7Plants having little or no secondary growth are
  8. Q8Sweet potato is a modified
  9. Q9Pneumatophores occur in
  10. Q10Which of the following statements is correct?
  11. Q11Select the correct match
  12. Q12 A ‘new’ variety of rice was patented by a foreign company, though such varieties have been present in India for a long time. This is related to …
  13. Q13Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called
  14. Q14In India, the organisation responsible for assessing the safety of introducing genetically modified organisms for public use is
  15. Q15The correct order of steps in Polymerase Chain Reaction (PCR) is
  16. Q16Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?
  17. Q17Which of the following has proved helpful in preserving pollen as fossils?
  18. Q18Which of the following flowers only once in its life-time?
  19. Q19Offsets are produced by
  20. Q20Which of the following pairs is wrongly matched?
  21. Q21Stomatal movement is not affected by
  22. Q22Which among the following is not a prokaryote?
  23. Q23Which of the following is not a product of light reaction of photosynthesis?
  24. Q24The Golgi complex participates in
  25. Q25 What type of ecological pyramid would be obtained with the following data? Secondary consumer : 120 g Primary consumer : 60 g Primary producer : 10 g …
  26. Q26In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen?
  27. Q27Natality refers to
  28. Q28World Ozone Day is celebrated on
  29. Q29Which of the following is a secondary pollutant?
  30. Q30Niche is
  31. Q31What is the role of NAD+ in cellular respiration?
  32. Q32Which of the following elements is responsible for maintaining turgor in cells?
  33. Q33Oxygen is not produced during photosynthesis by
  34. Q34Double fertilization is
  35. Q35Pollen grains can be stored for several years in liquid nitrogen having a temperature of
  36. Q36 Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other? …
  37. Q37Stomata in grass leaf are
  38. Q38The two functional groups characteristic of sugars are
  39. Q39The stage during which separation of the paired homologous chromosomes begins is
  40. Q40Which of the following is true for nucleolus?
  41. Q41Among the following sets of examples for divergent evolution, select the incorrect option :
  42. Q42Which of the following hormones can play a significant role in osteoporosis?
  43. Q43The transparent lens in the human eye is held in its place by
  44. Q44Which of the following structures or regions is incorrectly paired with its functions?
  45. Q45Which of the following is an amino acid derived hormone?
  46. Q46Match the items given in Column I with those in Column II and select the correct option given below: 
  47. Q47Which one is wrongly matched?
  48. Q48After karyogamy followed by meiosis, spores are produced exogenously in
  49. Q49Winged pollen grains are present in
  50. Q50In which of the following forms is iron absorbed by plants?
  51. Q51Which part of poppy plant is used to obtain the drug “Smack”?
  52. Q52In a growing population of a country,
  53. Q53Match the items given in Column I with those in Column II and select the correct option given below :
  54. Q54All of the following are included in ‘ex-situ conservation’ except
  55. Q55Which one of the following population interactions is widely used in medical science for the production of antibiotics?
  56. Q56Conversion of milk to curd improves its nutritional value by increasing the amount of
  57. Q57The similarity of bone structure in the forelimbs of many vertebrates is an example of
  58. Q58In which disease does mosquito transmitted pathogen cause chronic inflammation of lymphatic vessels?
  59. Q59 Which of the following characteristics represent ‘Inheritance of blood groups’ in humans? a. Dominance b. Co-dominance c. Multiple allele d. Incomplete dominance e. Polygenic inheritance …
  60. Q60Which of the following is not an autoimmune disease?
  61. Q61Which of the following events does not occur in rough endoplasmic reticulum?
  62. Q62Match the items given in Column I with those in Column II and select the correct option given below: 
  63. Q63Match the items given in Column I with those in Column II and select the correct option given below : 
  64. Q64Match the items given in Column I with those in Column II and select the correct option given below:
  65. Q65Match the items given in Column I with those in Column II and select the correct option given below :
  66. Q66Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively?
  67. Q67The difference between spermiogenesis and spermiation is
  68. Q68The amnion of mammalian embryo is derived from
  69. Q69The contraceptive ‘SAHELI’
  70. Q70Hormones secreted by the placenta to maintain pregnancy are
  71. Q71A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by
  72. Q72AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?
  73. Q73All of the following are part of an operon except.
  74. Q74Match the items given in Column I with those in Column II and select the correct option given below : 
  75. Q75According to Hugo de Vries, the mechanism of evolution is
  76. Q76 Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as …
  77. Q77Select the incorrect match :
  78. Q78Which of the following terms describe human dentition?
  79. Q79Nissl bodies are mainly composed of
  80. Q80Which of these statements is incorrect?
  81. Q81Which of the following organisms are known as chief producers in the oceans?
  82. Q82Which of the following animals does not undergo metamorphosis?
  83. Q83Which one of these animals is not a homeotherm?
  84. Q84Which of the following features is used to identify a male cockroach from a female cockroach?
  85. Q85 Ciliates differ from all other protozoans in
  86. Q86Identify the vertebrate group of animals characterized by crop and gizzard in its digestive system
  87. Q87. Calcium is important in skeletal muscle contraction because it
  88. Q88Which of the following is an occupational respiratory disorder?
  89. Q89Match the items given in Column I with those in Column II and select the correct option given below : 
  90. Q90Which of the following gastric cells indirectly help in erythropoiesis?

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