NEET 2021 | NEET Year Wise Previous Years Questions

Biology

Chemistry

1. The incorrect statement among the following is : 2. Given below are two statements :Statement I :Aspirin and Paracetamol belong to the class of narcotic analgesics.Statemen 3. Statement I : Acid strength increases in the order given as HF << HCl << HBr << HI.Statement II : As t 4. Which one among the following is the correct option for right relationship between CP and CV for one mole of ideal gas? 5. The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cells is : 6. Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is : 7. Tritium, a radioactive isotope of hydrogen, emits which of the the following particles? 8. The maximum temperature that can be achieved in blast furnace is : 9. BF3 is planar and electron deficient compound. Hybridization and number of elements around the central atom, respectivel 10. The major product of the following chemical reaction is : 11. The molar conductance of NaCl, HCl and CH3COONa at infinite dilution are 126.45, 426.16 and 91.0 S cm2 mol$$-$$1 respect 12. A particular station of All India Radio, New Delhi broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of 13. Which of the following reactions is the metal displacement reaction? Choose the right option. 14. The right option for the statement "Tyndall effect is exhibited by", is : 15. The compound which shows metamerism is : 16. Match List - I with List - II : List - I List - II (a) $$PC{l_5}$$ (i) Squ 17. Which one of the following polymers is prepared by addition polymerisation? 18. The RBC deficiency of deficiency disease of : 19. Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali. 20. Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of : 21. Ethylene diaminetetraacetate (EDTA) ion is : 22. The major product formed in dehydrohalogenation reaction of 2-Bromo pentane is Pent-2-ene. This product formation is bas 23. An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirica 24. The pKb of dimethyl amine and pKa of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for the pH 25. The structures of beryllium chloride in solid state and vapour phase, are : 26. Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature? 27. Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are : 28. The correct structure of 2, 6-dimethyl-dec-4-ene is 29. Choose the correct option for graphical representation of Boyle's law, which shows a graph of pressure vs. volume of a g 30. The following solutions were prepared by dissolving 10 g of glucose (C6H12O6) in 250 ml of water (P1), 10 g of urea (CH4 31. The correct sequence of bond enthalpy of 'C-X' bond is : 32. Dihedral angle of least stable conformer of ethane is : 33. Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them. 34. What is the IUPAC name of the organic compound formed in the following chemical reaction? 35. For a reaction, A $$\to$$ B, enthalpy of reaction is $$-$$4.2 kJ mol$$-$$1 and enthalpy of activation is 9.6 kJ mol$$-$$ 36. Match List-I with List-II : List-I List-II (a) $$2S{O_2}(g) + {O_2}(g) \to 2S{O_3} 37. Consider the above reaction and identify the missing reagent/chemical. 38. The correct option for the value of vapour pressure of a solution at 45$$^\circ$$C with benzene to octane in molar ratio 39. Match List-I with List-II Choose the correct answer from the options given below. 40. The intermediate compound 'X' in the following chemical reaction is : 41. The product formed in the following chemical reaction is : 42. The slope of Arrhenius plot $$\left( {\ln \,k\,v/s{1 \over T}} \right)$$ of first order reactino is $$-$$5 $$\times$$ 10 43. The reagent 'R' in the given sequence of chemical reaction is : 44. For irreversible expansion of an ideal gas under isothermal condition, the correct option is : 45. From the following pairs of ions which one is not an iso-electronic pair? 46. The molar conductivity of 0.007 M acetic acid is 20 S cm2 mol$$-$$1. What is the dissociation constant of acetic acid? C 47. Which of the following molecules is non-polar in nature? 48. Match List-I with List-II : List-I List-II (a) $${[Fe{(CN)_6}]^{3 - }}$$ (i) 49. Choose the correct option for the total pressure (in atm.) in a mixture of 4g O2 and 2g H2 confined in a total volume of 50. In which one of the following arrangements the given sequence is not strictly according to the properties indicted again

Physics

1. The E and G respectively denote energy and gravitational constant, then $${E \over G}$$ has the dimensions of : 2. An inductor of inductance L, a capacitor of capacitance C and a resistor of resistance 'R' are connected in series to an 3. A body is executing simple harmonic motion with frequency 'n', the frequency of its potential energy is : 4. A thick current carrying cable of radius 'R' carries current 'I' uniformly distributed across its cross section. The var 5. A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding per nucleon of unfragmente 6. A parallel plate capacitor has a uniform electric field $$\overrightarrow E $$ in the space between the plates. If the d 7. The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600nm, when it 8. Polar molecules are the molecules : 9. The half life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours 10. A capacitor of capacitance 'C', is connected across an ac source of voltage V, given by V = V0sin$$\omega$$tThe displace 11. A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading : 0 mmCircular 12. Find the value of the angle of emergence from the prism. Refractive index of the glass is $$\sqrt 3 $$ 13. In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V 14. A particle is released from height S from the surface of the Earth. At a certain height its kinetic energy is three time 15. The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-secti 16. Water falls from a height of 60m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% 17. An infinitely long straight conductor carries a current of 5A as shown. An electron is moving with a speed of 105 m/s pa 18. Consider the following statements (A) and (B) and identify the correct answer.(A) A Zener diode is connected in reverse 19. A spring is stretched by 5 cm by a force 10 N. The time period of the oscillations when a mass of 2 kg is suspended by i 20. The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor. An ex 21. A dipole is placed in an electric field as shown. In which direction will it move? 22. A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a 23. The escape velocity from the Earth's surface is v. The escape velocity from the surface of another planet having a radiu 24. An electromagnetic wave of wavelength '$$\lambda$$' is incident on a photosensitive surface of negligible work function. 25. A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since : 26. Two charged spherical conductors of radius R1 and R2 are connected by a wire. Then the ratio of surface charge densities 27. For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct po 28. A cup of coffee cools from 90$$^\circ$$C to 80$$^\circ$$C in t minutes, when the room temperature is 20$$^\circ$$C. The 29. The equivalent capacitance of the combination shown in the figure is : 30. If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities. Find the dimensions of en 31. A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let Sn be the distance travelled 32. The velocity of a small ball of mass M and density d, when dropped in a container filled with glycerin becomes constant 33. Column - I gives certain physical terms associated with flow of current through a metallic conductor. Column-II gives so 34. A radioactive nucleus $$_Z^AX$$ $$\to$$ $${}_{Z - 1}B$$ $$\to$$ $${}_{Z - 3}C$$ $$\to$$ $${}_{Z - 2}D$$, where Z is the 35. Match Column - I and Column - II and choose the correct match from the given choices. Column - I C 36. In the product$$\overrightarrow F = q\left( {\overrightarrow v \times \overrightarrow B } \right)$$$$ = q\overrightarr 37. From a circular ring of mass 'M' and radius 'R' an arc corresponding to a 90$$^\circ$$ sector is removed. The moment of 38. Three resistors having resistances r1, r2 and r3 are connected as shown in the given circuit. The ratio $${{{i_3}} \over 39. A ball of mass 0.15 kg is dropped from a height 10m, strikes the ground and rebounds to the same height. The magnitude o 40. A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44W lamp. Ignoring power lo 41. A uniform conducting wire of length 12a and resistance 'R' is wound up as a current carrying coil in the shape of ,(i) a 42. A particle of mass 'm' is projected with a velocity $$\upsilon $$ = kVe = (k < 1) from the surface of the earth. (Ve 43. A series LCR circuit containing 5.0 H inductor, 80$$\mu$$F capacitor and 40$$\Omega$$ resistor is connected to 230V vari 44. A particle moving in a circle of radius R with a uniform speed takes a time T to complete one revolution. If this partic 45. Two conducting circular loops of radii R1 and R2 are placed in the same plane with their centres coinciding. If R1 >& 46. Twenty seven drops of same size are charged at 220V each. They combine to form a bigger drop. Calculate the potential of 47. A uniform rod of length 200 cm and mass 500 g is balanced on a wedge placed at 40 cm mark. A mass of 2 kg is suspended f 48. A point object is placed at a distance of 60 cm from a convex lens of focal length 30 cm. If a plane mirror were put per 49. A car starts from rest and accelerates at 5m/s2. At t = 4 s, a ball is dropped out of a window by a person sitting in th 50. For the given circuit, the input digital signals are applied at the terminals A, B and C. What would be the output at th

NEET 2021

MCQ (Single Correct Answer)

-1

An electromagnetic wave of wavelength '$$\lambda$$' is incident on a photosensitive surface of negligible work function. If 'm' mass is of photoelectron emitted from the surface has de-Broglie wavelength $$\lambda$$_d, then :

$$\lambda = \left( {{{2h} \over {mc}}} \right){\lambda _d}^2$$

$$\lambda = \left( {{{2m} \over {hc}}} \right){\lambda _d}^2$$

$${\lambda _d} = \left( {{{2mc} \over h}} \right){\lambda ^2}$$

$$\lambda = \left( {{{2mc} \over h}} \right){\lambda _d}^2$$

NEET 2021

MCQ (Single Correct Answer)

-1

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since :

a large aperture contributes to the quality and visibility of the images.

a large area of the objective ensures better light gathering power.

a large aperture provides a better resolution.

All the above.

NEET 2021

MCQ (Single Correct Answer)

-1

Two charged spherical conductors of radius R₁ and R₂ are connected by a wire. Then the ratio of surface charge densities of the spheres ($$\sigma$$₁ / $$\sigma$$₂) is :

$${{R_1^2} \over {R_2^2}}$$

$${{R_1^{}} \over {R_2^{}}}$$

$${{R_2^{}} \over {R_1^{}}}$$

$$\sqrt {\left( {{{{R_1}} \over {{R_2}}}} \right)} $$

NEET 2021

MCQ (Single Correct Answer)

-1

For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively?

$$ - \widehat j + \widehat k, - \widehat j + \widehat k$$

$$ \widehat j + \widehat k, \widehat j + \widehat k$$

$$ - \widehat j + \widehat k, - \widehat j - \widehat k$$

$$\widehat j + \widehat k, - \widehat j - \widehat k$$

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