NEET 2018 | NEET Year Wise Previous Years Questions

Biology

Chemistry

1. The correct order of N-compounds in its decreasing order of oxidation states is 2. Which one of the following ions exhibits d-d transition and paramagnetism as well? 3. The bond dissociation energies of X2 , Y2 and XY are in the ratio of 1 : 0.5 : 1. $$\Delta $$H for the formation of XY 4. Which of the following carbocations is expected to be most stable? 5. The correct difference between first and second order reactions is that 6. The solubility of BaSO4 in water is 2.42 × 10–3 g L–1 at 298 K. The value of its solubility product (Ksp) will be (Give 7. Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which by Wurtz reaction is converted to gas 8. Nitration of aniline in strong acidic medium also gives m-nitroaniline because 9. Which of the following compounds can form a zwitter ion? 10. Which of the following statements is not true for halogens? 11. The type of isomerism shown by the complex [CoCl2(en)2] is 12. The compound C7H8 undergoes the following reactions : The product ‘C’ is 13. Which of the following oxides is most acidic in nature? 14. Consider the change in oxidation state of bromine corresponding to different emf values as shown in the given diagram : 15. Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations : A. 60 mL $${ 16. Which of the following is correct with respect to – I effect of the substituents? (R = alkyl) 17. Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the corr 18. The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether. A, B 19. Compound A, C8H10O, is found to react with NaOI (produced by reacting Y with NaOH) and yields a yellow precipitate with 20. A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4 . The evolved gaseous mixture is passed 21. The geometry and magnetic behaviour of the complex [Ni(CO)4] are 22. In which case is number of molecules of water maximum? 23. Which one is a wrong statement? 24. Which one of the following conditions will favour maximum formation of the product in the reaction A2(g) + B2(g) ⇌ X2(g 25. Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It i 26. Iron carbonyl, Fe(CO)5 is 27. Which one of the following elements is unable to form MF63– ion? 28. In the reaction, the electrophile involved is 29. For the redox reaction, MnO4– + C2O4 2– + H+ $$ \to $$ Mn2+ + CO2 + H2O The correct coefficients of the reactants for 30. The correct order of atomic radii in group 13 elements is 31. Consider the following species : CN+ , CN– , NO and CN. Which one of these will have the highest bond order? 32. In the structure of ClF3 , the number of lone pairs of electrons on central atom ‘Cl’ is 33. When initial concentration of the reactant is doubled, the half-life period of a zero order reaction 34. Which of the following molecules represents the order of hybridisation sp2 , sp2 , sp, sp from left to right atoms? 35. The difference between amylose and amylopectin is 36. Identify the major products P, Q and R in the following sequence of reactions :

Physics

1. A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale readin 2. A sample of 0.1 g of water at 100°C and normal pressure (1.013 × 105 N m–2) requires 54 cal of heat energy to convert t 3. The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A, B and C are KA, KB and KC, respec 4. The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is 5. The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the 6. A moving block having mass m, collides with another stationary block having mass 4m. The lighter block comes to rest aft 7. A set of n equal resistors, of value R each, are connected in series to a battery of emf E and internal resistance R. Th 8. If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitud 9. The power radiated by a black body is P and it radiates maximum energy at wavelength, $$\lambda $$0 . If the temperature 10. A pendulum is hung from the roof of a sufficiently high building and is moving freely to and fro like a simple harmonic 11. At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth’s atmosphe 12. An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced throu 13. Three objects, A : (a solid sphere), B : (a thin circular disk) and C : (a circular ring), each have the same mass M and 14. Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the seco 15. 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 16. An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. 17. A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field 18. 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 19. An inductor 20 mH, a capacitor 100 $$\mu $$F and a resistor 50 $$\Omega $$ are connected in series across a source of em 20. An EM wave is propagating in a medium with a velocity $$\overrightarrow v = v\widehat i$$. The instantaneous oscillatin 21. An electron of mass m with an initial velocity $$\overrightarrow v = {v_0}\widehat i$$ (v0 > 0) enters an electric 22. In Young’s double slit experiment the separation d between the slits is 2 mm, the wavelength $$\lambda $$ of the light u 23. When the light of frequency 2$${\upsilon _0}$$ (where $${\upsilon _0}$$ is threshold frequency), is incident on a meta 24. An astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an o 25. The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is 26. In the combination of the following gates the output Y can be written in terms of inputs A and B as 27. In a p-n junction diode, change in temperature due to heating 28. The refractive index of the material of a prism is $$\sqrt 2 $$ and the angle of the prism is 30°. One of the two refrac 29. Unpolarised light is incident from air on a plane surface of a material of refractive index $$\mu $$. At a particular an 30. The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, 31. The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This ind 32. A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet 33. Which one of the following statements is incorrect? 34. A block of mass m is placed on a smooth inclined wedge ABC of inclination q as shown in the figure. The wedge is given a 35. The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of 36. Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit v 37. A solid sphere is rotating freely about its symmetry axis in free space. The radius of the sphere is increased keeping i 38. A solid sphere is in rolling motion. In rolling motion a body possesses translational kinetic energy (Kt) as well as rot 39. A body initially at rest and sliding along a frictionless track from a height h (as shown in the figure) just completes 40. A small sphere of radius ‘r’ falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. Th 41. The moment of the force, $$\overrightarrow F = 4\widehat i + 5\widehat j - 6\widehat k$$ at (2, 0, –3), about the point 42. A carbon resistor of (47 $$ \pm $$ 4.7) k$$\Omega $$ is to be marked with rings of different colours for its identificat 43. A battery consists of a variable number n of identical cells (having internal resistance r each) which are connected in

NEET 2018

MCQ (Single Correct Answer)

-1

In the combination of the following gates the output Y can be written in terms of inputs A and B as NEET 2018 Physics - Semiconductor Electronics Question 34 English

NEET 2018 Physics - Semiconductor Electronics Question 34 English

$$\overline {A.B} $$

$$A.\overline B + \overline A .B$$

$$\overline {A.B} + A.B$$

$$\overline {A + B} $$

NEET 2018

MCQ (Single Correct Answer)

-1

In a p-n junction diode, change in temperature due to heating

affects only reverse resistance

affects only forward resistance

does not affect resistance of p-n junction

affects the overall V - I characteristics of p-n junction

NEET 2018

MCQ (Single Correct Answer)

-1

The refractive index of the material of a prism is $$\sqrt 2 $$ and the angle of the prism is 30°. One of the two refracting surfaces of the prism is made a mirror inwards, by silver coating. A beam of monochromatic light entering the prism from the other face will retrace its path (after reflection from the silvered surface) if its angle of incidence on the prism is

60⁰

45⁰

30⁰

zero

NEET 2018

MCQ (Single Correct Answer)

-1

Unpolarised light is incident from air on a plane surface of a material of refractive index $$\mu $$. 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?

Reflected light is polarised with its electric vector parallel to the plane of incidence

Reflected light is polarised with its electric vector perpendicular to the plane of incidence

$$i = {\sin ^{ - 1}}\left( {{1 \over \mu }} \right)$$

i = tan^-1$$\left( {{1 \over \mu }} \right)$$

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