AIPMT 2007 | NEET Year Wise Previous Years Questions

Biology

Chemistry

1. Which of the following oxidation states are the most characteristic for lead and tin respectively? 2. Which one of the following orders correctly represents the increasing acid strengths of the given acids? 3. Which one of the following ions is the most stable in aqueous solution? (At. No. Ti = 22, V = 23, Cr = 24, Mn = 25) 4. Identify the incorrect statement among the following: 5. The d electron configurations of Cr2+, Mn2+, Fe2+ and Ni2+ are 3d4, 3d5, 3d6 and 3d8 respectively. Which one of the foll 6. Which of the following will give a pair of enantiomorphs? (en = NH2CH2CH2NH2) 7. Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g mL$$-$$1. Volume of acid required t 8. Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called 9. Consider the following compounds The correct decreasing order of their reactivity towards hydrolysis is 10. Which of the following represents the correct order of the acidity in the given compounds ? 11. The product formed in Aldol condensation is 12. Which one of the following on treatment with 50% aqueous sodium hydroxide yields the corresponding alcohol and acid? 13. Which of the following vitamins is water-soluble? 14. Which one of the following on reduction with lithium aluminium hydride yields a secondary amine? 15. RNA and DNA are chiral molecules, their chirality is due to 16. In the reaction : Which of the following compounds will be formed? 17. 0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If Kf for water is 1.86 K kg mol$$-$$1, the lowering in f 18. In a first-order reaction A $$ \to $$ B, if k is rate constant and initial concentration of the reactant A is 0.5 M, the 19. The efficiency of a fuel cell is given by 20. The equilibrium constant of the reaction: Cu(s) + 2Ag+(aq) $$ \to $$ Cu2+(aq) + 2Ag(s); Eo = 0.46 V at 298 K is 21. The reaction of hydrogen and iodine monochloride is given as : H2(g) + 2ICl(g) $$ \to $$ 2HCl(g) + I2(g) This reaction 22. If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximate 23. Which of the following anions is present in the chain structure of silicates? 24. Consider the following reactions : (i) H+(aq) + OH$$-$$(aq) = H2O(l),  $$\Delta $$H = $$-$$ X1 kJ mol$$- 25. An element, X has the following isotopic composition: 200X : 90%  199X : 8.0%  202X : 2.0% The weig 26. Identify the correct order of the size of the following : 27. With which of the following electronic configuration an atom has the lowest ionisation enthalpy ? 28. Consider the following sets of quantum numbers : .tg {border-collapse:collapse;border-spacing:0;border:none;} .tg td{ 29. Which one of the following ionic species has the greatest proton affinity to form stable compound ? 30. In which of the following pairs, the two species are isostructural? 31. The correct order of C $$-$$ O bond length among CO, CO$${_3^{2 - }}$$, CO2 is 32. The equilibrium constants of the following are N2 + 3H2 $$\rightleftharpoons$$ 2NH3;     K1 N2 33. Given that bond energies of H $$-$$ H and Cl $$-$$ Cl are 430 kJ mol$$-$$1 and 240 kJ mol$$-$$1 respectively and $$\Delt 34. A weak acid, HA, has a Ka of 1.00 $$ \times $$ 10$$-$$5. If 0.100 mol of this acid is dissolved in one litre of water, t 35. Calculate the pOH of a solution at 25oC that contains 1 $$ \times $$ 10$$-$$10 M of hydronium ions, i.e. H3O+. 36. Which of the compound with molecular formula C5H10 yields acetone on ozonolysis? 37. Predict the product C obtained in the following reaction of 1-butyne. 38. The order of decreasing reactivity towards an electrophilic reagent, for the following would be (i) benzene (ii) tolu 39. For (i) I$$-$$, (ii) Cl$$-$$, (iii) Br$$-$$, the increasing order of nucleophilicity would be 40. CH3 $$-$$ CHCl $$-$$ CH2 $$-$$ CH3 has a chiral centre. Which one of the following represents its R-configuration? 41. If there is no rotation of plane polarised light by a compound in a specific solvent, through to be chiral, it may mean

Physics

1. A small coin is resting on the bottom of a beaker filled with liquid . A ray of light from the coin travels upto the sur 2. Two condensers, one of capacity C and other of capacity C/2 are connected to a V-volt battery, as shown in the figure. T 3. The resistance of an ammeter is 13 $$\Omega $$ and its scale is graduated for a current upto 100 amps. After an addition 4. Three resistances, P, Q, R each of 2$$\Omega $$ and an unknown resistance S from the four arms of a Wheatstone bridge ci 5. A hollow cylinder has a charge q coulomb within it. If $$f$$ is the electric flux in units of voltmeter associated with 6. Under the influence of a uniform magnetic field, a charged particle moves with constant speed v in a circle of radius R. 7. Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then 8. A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 amp, the efficiency 9. What is the value of inductance L for which the current is maximum in a series LCR circuit with C = 10 $$\mu $$F and $$\ 10. The electric and magnetic field of an electromagnetic wave are 11. The primary and secondary coils of a transformer have 50 and 1500 turns respectively. If the magnetic flux $$\phi $$ lin 12. Three point charges +q, $$-$$ 2q and + q are placed at points (x = 0, y = a, z = 0), (x = 0, y = 0, z = 0) and (x = $$a$ 13. Monochromatic light of frequency 6.0 $$ \times $$ 1014 Hz is produced by a laser. The power emitted is 2 $$ \times $$ 10 14. A beam of electron passes undeflected through mutually perpendicular electric and magnetic fields. If the electric field 15. A 5 watt source emits monochromatic light of wavelength 5000 $$\mathop A\limits^ \circ $$. When placed 0.5 m away, it l 16. The frequency of a light wave in a material is 2 $$ \times $$ 1014 Hz and wavelength is 5000 $$\mathop A\limits^ \circ 17. The total energy of electron in the ground state of hydrogen atom is $$-$$ 13.6 eV. The kinetic energy of an electron in 18. In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons res 19. A nucleus $${}_Z^AX$$ has mass represented by M(A, Z). If Mp and Mn denote the mass of proton and neutron respectively a 20. In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table. 21. Two satellites of earth, S1 and S2 are moving in the same orbit. The mass of S1 is four times the mass of S2. Which one 22. A car moves from X to Y with a uniform speed vu and returns to Y with a uniform speed vd. The average speed for this rou 23. The positions x of a particle with respect to time t along x-axis is given by x = 9t2 $$-$$ t3 where x is in metres and 24. Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, of length L, of time T and of curre 25. A block B is pushed momentarily along a horizontaly surface with an initial velocity V. If  $$\mu $$  is the c 26. A particle starting from the origin (0, 0) moves in a straight line in the (x, y) planes. Its coordinates at a later tim 27. $$\overrightarrow A $$ and $$\overrightarrow B $$ are two vectors and $$\theta $$ is the angle between them, if $$\left 28. A particle of mass m moves in the XY plane with a velocity v along the straight line AB. If the angular momentum of the 29. A uniform rod AB of length $$l$$ and mass m is free to rotate about point A. The rod is released from rest in the horizo 30. A vertical spring with force constant k is fixed on a table. A ball of mass m at a height h above the free upper end of 31. A wheel has angular acceleration of 3.0 rad/sec2 and an initial angular speed of 2.00 rad/sec. In a time of 2 sec it has 32. Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature toC, the powe 33. A black body is at 727oC. It emits energy at a rate which is proportional to 34. A particle executes simple harmonic oscillation with an amplitude $$a$$. The period of oscillation is T. The minimum tim 35. A mass of 2.0 kg is put on a flat pan attached to a vertical spring fixed on the ground as shown in the figure. The mass 36. The particle executing simple harmonic motion has a kinetic energy K0cos2$$\omega $$t. The maximum values of the potenti 37. The phase difference between the instantaneous velocity and acceleration of a particle executing simple harmonic motion 38. An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62oC, its efficiency is doubled. Temperat 39. The total power dissipated in watt in the circuit shown here is 40. A charged particle (charge q) is moving in a circle of radius R with uniform speed v. The associated magnetic moment $$\ 41. Charges +q and $$-$$q are placed at points A and B respectively which are a distance 2L apart, C is the midnight between 42. For a cubic crystal structure which one of the following relations indicating the cell characteristics is correct ? 43. Which one of the following represents forward bias diode ? 44. In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potentia 45. A particle moving along x-axis has acceleration f, at time t, given by f = f0$$\left( {1 - {t \over T}} \right),$$ where

AIPMT 2007

MCQ (Single Correct Answer)

-1

The reaction of hydrogen and iodine monochloride is given as :
H_2(g) + 2ICl_(g) $$ \to $$ 2HCl_(g) + I_2(g)
This reaction is of first order with respect to H_2(g) and ICl_(g),
following mechanisms were proposed.

Mechanism A :
     H_2(g) + 2ICl_(g) $$ \to $$ 2HCl_(g) + I_2(g)
Mechanism B :
     H_2(g) + ICl_(g) $$ \to $$ HCl_(g) + HI_(g) ; slow
     HI_(g) + ICl_(g) $$ \to $$ HCl_(g) + I_2(g) ; fast

Which of the above mechanism(s) can be consistent with the given information about the reaction?

A and B both

Neither A nor B

A only

B only

AIPMT 2007

MCQ (Single Correct Answer)

-1

If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately
(log 4 = 0.60, log 5 = 0.69)

45 minutes

60 minutes

40 minutes

50 minutes

AIPMT 2007

MCQ (Single Correct Answer)

-1

Which of the following anions is present in the chain structure of silicates?

(Si₂O$$_5^{2 - }$$)_n

(SiO$$_3^{2 - }$$)_n

SiO$$_4^{4 - }$$

Si₂O$$_7^{6 - }$$

AIPMT 2007

MCQ (Single Correct Answer)

-1

Consider the following reactions :
(i) H⁺_(aq) + OH^$$-$$_(aq) = H₂O_(l),  $$\Delta $$H = $$-$$ X₁ kJ mol^$$-$$1
(ii) H_2(g) + 1/2O_2(g) = H₂O_(l),   $$\Delta $$H = $$-$$ X₂ kJ mol^$$-$$1
(iii) CO_2(g) + H_2(g) = CO_(g) + H₂O_(l),  $$\Delta $$H = $$-$$ X₃ kJ mol^$$-$$1
(iv) C₂H_2(g) + 5/2O_2(g) = 2CO_2(g) + H₂O_(l),    $$\Delta $$H = +X₄ kJ mol^$$-$$1

Enthalpy of formation of H₂O_(l) is

+X₃ kJ mol^$$-$$1

$$-$$X₄ kJ mol^$$-$$1

+X₁ kJ mol^$$-$$1

$$-$$X₂ kJ mol^$$-$$1

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