PYQ Vault

NEET (UG) 2021 question paper

200 questions · 800 marks · 200 minutes · +4 per correct answer, -1 per wrong one

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Physics

50 questions

  1. 1
    Two charged spherical conductors of radius R1R_1 and R2R_2 are connected by a wire. Then the ratio of surface charge densities of the spheres (σ1/σ2)(\sigma_1/\sigma_2) is

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  2. 2
    The velocity of a small ball of mass MM and density dd, when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is d2\dfrac{d}{2}, then the viscous force acting on the ball will be

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  3. 3
    An infinitely long straight conductor carries a current of 5 A as shown. An electron is moving with a speed of 10510^5 m/s parallel to the conductor. The perpendicular distance between the electron and the conductor is 20 cm at an instant. Calculate the magnitude of the force experienced by the electron at that instant.

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  4. 4
    A dipole is placed in an electric field as shown. In which direction will it move? (The dipole has +q+q on the left and −q-q on the right, aligned along a non-uniform field E⃗\vec{E} that is stronger to the left and weaker to the right.)

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  5. 5
    A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since

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  6. 6
    A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading : 0 mm Circular scale reading : 52 divisions Given that 1 mm on main scale corresponds to 100 divisions on the circular scale. The diameter of the wire from the above data is

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  7. 7
    A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding energy per nucleon of unfragmented nuclei is 7.6 MeV while that of fragments is 8.5 MeV. The total gain in the Binding Energy in the process is

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  8. 8
    A small block slides down on a smooth inclined plane, starting from rest at time t=0t = 0. Let SnS_n be the distance travelled by the block in the interval t=n−1t = n - 1 to t=nt = n. Then, the ratio SnSn+1\dfrac{S_n}{S_{n+1}} is

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  9. 9
    Find the value of the angle of emergence from the prism. Refractive index of the glass is 3\sqrt{3}. (The prism is a right-angled prism with a 60° angle; the ray strikes normally on the hypotenuse face.)

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  10. 10
    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 it is

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  11. 11
    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 distance 'd' between them. If a parallel beam of light falling on 'A' leaves 'B' as a parallel beam, then the distance 'd' in cm will be

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  12. 12
    Column-I gives certain physical terms associated with flow of current through a metallic conductor. Column-II gives some mathematical relations involving electrical quantities. Match Column-I and Column-II with appropriate relations.
    Column-IColumn-II
    (A) Drift Velocity(P) mne2ρ\dfrac{m}{ne^2\rho}
    (B) Electrical Resistivity(Q) nevdnev_d
    (C) Relaxation Period(R) eEmτ\dfrac{eE}{m}\tau
    (D) Current Density(S) EJ\dfrac{E}{J}

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  13. 13
    The electron concentration in an nn-type semiconductor is the same as hole concentration in a pp-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.

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  14. 14
    A radioactive nucleus ZAX{}_{Z}^{A}X undergoes spontaneous decay in the sequence ZAX→Z−1B→Z−3C→Z−2D{}_{Z}^{A}X \rightarrow {}_{Z-1}B \rightarrow {}_{Z-3}C \rightarrow {}_{Z-2}D, where ZZ is the atomic number of element XX. The possible decay particles in the sequence are

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  15. 15
    Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? (g=10 m/s2)(g = 10\text{ m/s}^2)

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  16. 16
    The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600 nm, when it delivers the power of 3.3×10−33.3\times10^{-3} watt will be (h=6.6×10−34(h = 6.6\times10^{-34} J s)

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  17. 17
    For a plane electromagnetic wave propagating in xx-direction, which one of the following combination gives the correct possible directions for electric field (E)(E) and magnetic field (B)(B) respectively?

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  18. 18
    The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is 0.25 Ω\Omega. What will be the effective resistance if they are connected in series?

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  19. 19
    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 replaces the first cell, then at what length of the wire, the balance point occurs?

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  20. 20
    Polar molecules are the molecules

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  21. 21
    A parallel plate capacitor has a uniform electric field E⃗\vec{E} in the space between the plates. If the distance between the plates is dd and the area of each plate is AA, the energy stored in the capacitor is (ε0=permittivity of free space)(\varepsilon_0 = \text{permittivity of free space})

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  22. 22
    The equivalent capacitance of the combination shown in the figure is. (Two capacitors CC in series form the outer branch, and a capacitor CC bridges between their junction and the same two nodes, so its two plates are at the same potential.)

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  23. 23
    Consider the following statements (A) and (B) and identify the correct answer. (A) A zener diode is connected in reverse bias, when used as a voltage regulator. (B) The potential barrier of pp-nn junction lies between 0.1 V to 0.3 V.

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  24. 24
    A particle is released from height SS from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively

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  25. 25
    If EE and GG respectively denote energy and gravitational constant, then EG\dfrac{E}{G} has the dimensions of

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  26. 26
    Match Column - I and Column - II and choose the correct match from the given choices.
    Column - IColumn - II
    (A) Root mean square speed of gas molecules(P) 13nmvˉ2\dfrac{1}{3}nm\bar{v}^2
    (B) Pressure exerted by ideal gas(Q) 3RTM\sqrt{\dfrac{3RT}{M}}
    (C) Average kinetic energy of a molecule(R) 52RT\dfrac{5}{2}RT
    (D) Total internal energy of 1 mole of a diatomic gas(S) 32kBT\dfrac{3}{2}k_B T

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  27. 27
    A body is executing simple harmonic motion with frequency nn, the frequency of its potential energy is

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  28. 28
    A cup of coffee cools from 90°C to 80°C in tt minutes, when the room temperature is 20°C. The time taken by a similar cup of coffee to cool from 80°C to 60°C at a room temperature same at 20°C is

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  29. 29
    A capacitor of capacitance CC, is connected across an ac source of voltage VV, given by V=V0sin⁡ωtV = V_0\sin\omega t. The displacement current between the plates of the capacitor, would then be given by

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  30. 30
    The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be

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  31. 31
    An inductor of inductance LL, a capacitor of capacitance CC and a resistor of resistance RR are connected in series to an ac source of potential difference VV volts as shown in figure. Potential difference across LL, CC and RR is 40 V, 10 V and 40 V, respectively. The amplitude of current flowing through LCRLCR series circuit is 10210\sqrt{2} A. The impedance of the circuit is

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  32. 32
    A thick current carrying cable of radius RR carries current II uniformly distributed across its cross-section. The variation of magnetic field B(r)B(r) due to the cable with the distance rr from the axis of the cable is represented by

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  33. 33
    An electromagnetic wave of wavelength λ\lambda is incident on a photosensitive surface of negligible work function. If mm mass is of photoelectron emitted from the surface has de-Broglie wavelength λd\lambda_d, then

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  34. 34
    The escape velocity from the Earth's surface is vv. The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is

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  35. 35
    If force [F][F], acceleration [A][A] and time [T][T] are chosen as the fundamental physical quantities. Find the dimensions of energy.

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  36. 36
    Two conducting circular loops of radii R1R_1 and R2R_2 are placed in the same plane with their centres coinciding. If R1>>R2R_1 >> R_2, the mutual inductance MM between them will be directly proportional to

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  37. 37
    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 perpendicular to the principal axis of the lens and at a distance of 40 cm from it, the final image would be formed at a distance of

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  38. 38
    Three resistors having resistances r1r_1, r2r_2 and r3r_3 are connected as shown in the given circuit. The ratio i3i1\dfrac{i_3}{i_1} of currents in terms of resistances used in the circuit is

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  39. 39
    For the given circuit, the input digital signals are applied at the terminals AA, BB and CC. What would be the output at the terminal yy? (The circuit is an AND gate on inputs A, B feeding an OR gate, and a NAND gate on inputs B, C feeding the same OR gate; the input waveforms for A, B, C over intervals t1t_1–t6t_6 are given.)

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  40. 40
    A series LCR circuit containing 5.0 H inductor, 80 μ\muF capacitor and 40 Ω\Omega resistor is connected to 230 V variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be

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  41. 41
    A car starts from rest and accelerates at 5 m/s2^2. At t=4t = 4 s, a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at t=6t = 6 s? (Take g=10g = 10 m/s2^2)

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  42. 42
    A particle of mass mm is projected with a velocity v=kVev = kV_e (k<1)(k < 1) from the surface of the earth. (Ve=escape velocity)(V_e = \text{escape velocity}) The maximum height above the surface reached by the particle is

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  43. 43
    A particle moving in a circle of radius RR with a uniform speed takes a time TT to complete one revolution. If this particle were projected with the same speed at an angle θ\theta to the horizontal, the maximum height attained by it equals 4R4R. The angle of projection, θ\theta, is then given by :

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  44. 44
    In the product F⃗=q(v⃗×B⃗)=qv⃗×(Bi^+Bj^+B0k^)\vec{F} = q(\vec{v}\times\vec{B}) = q\vec{v}\times(B\hat{i} + B\hat{j} + B_0\hat{k}). For q=1q = 1 and v⃗=2i^+4j^+6k^\vec{v} = 2\hat{i} + 4\hat{j} + 6\hat{k} and F⃗=4i^−20j^+12k^\vec{F} = 4\hat{i} - 20\hat{j} + 12\hat{k}. What will be the complete expression for B⃗\vec{B}?

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  45. 45
    A ball of mass 0.15 kg is dropped from a height 10 m, strikes the ground and rebounds to the same height. The magnitude of impulse imparted to the ball is (g=10(g = 10 m/s2)^2) nearly

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  46. 46
    A uniform conducting wire of length 12a12a and resistance RR is wound up as a current carrying coil in the shape of, (i) an equilateral triangle of side aa. (ii) a square of side aa. The magnetic dipole moments of the coil in each case respectively are

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  47. 47
    Twenty seven drops of same size are charged at 200 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.

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  48. 48
    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 from the rod at 20 cm and another unknown mass mm is suspended from the rod at 160 cm mark as shown in the figure. Find the value of mm such that the rod is in equilibrium. (g=10(g = 10 m/s2)^2)

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  49. 49
    From a circular ring of mass MM and radius RR an arc corresponding to a 90° sector is removed. The moment of inertia of the remaining part of the ring about an axis passing through the centre of the ring and perpendicular to the plane of the ring is KK times MR2MR^2. Then the value of KK is

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  50. 50
    A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?

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Chemistry

50 questions

  1. 51
    Dihedral angle of least stable conformer of ethane is :

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  2. 52
    Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.

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  3. 53
    The major product of the following chemical reaction is :
    (CH3)2CH−CH=CH2+HBr→(C6H5CO)2O2  ?(CH_3)_2CH-CH=CH_2 + HBr \xrightarrow{(C_6H_5CO)_2O_2} \; ?

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  4. 54
    A particular station of All India Radio, New Delhi broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is : [speed of light c=3.0×108  ms−1c = 3.0 \times 10^8 \; ms^{-1}]

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  5. 55
    The incorrect statement among the following is :

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  6. 56
    Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are :

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  7. 57
    Identify the compound that will react with Hinsberg's reagent to give a solid which dissolves in alkali.

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  8. 58
    Which of the following reactions is the metal displacement reaction? Choose the right option.

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  9. 59
    Given below are two statements : Statement I : Aspirin and Paracetamol belong to the class of narcotic analgesics. Statement II : Morphine and Heroin are non-narcotic analgesics. In the light of the above statements, choose the correct answer from the options given below.

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  10. 60
    What is the IUPAC name of the organic compound formed in the following chemical reaction?
    Acetone→(ii) H2O,H+(i) C2H5MgBr, dry EtherProduct\text{Acetone} \xrightarrow[\text{(ii) } H_2O, H^+]{\text{(i) } C_2H_5MgBr, \text{ dry Ether}} \text{Product}

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  11. 61
    Statement I : Acid strength increases in the order given as HF << HCl << HBr << HI. Statement II : As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and so the acid strength increases. In the light of the above statements, choose the correct answer from the options given below.

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  12. 62
    Which one among the following is the correct option for right relationship between CPC_P and CVC_V for one mole of ideal gas?

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  13. 63
    Match List-I with List-II.
    List-IList-II
    (a) PCl5PCl_5(i) Square pyramidal
    (b) SF6SF_6(ii) Trigonal planar
    (c) BrF5BrF_5(iii) Octahedral
    (d) BF3BF_3(iv) Trigonal bipyramidal
    Choose the correct answer from the options given below.

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  14. 64
    The following solutions were prepared by dissolving 10 g of glucose (C6H12O6)(C_6H_{12}O_6) in 250 ml of water (P1)(P_1), 10 g of urea (CH4N2O)(CH_4N_2O) in 250 ml of water (P2)(P_2) and 10 g of sucrose (C12H22O11)(C_{12}H_{22}O_{11}) in 250 ml of water (P3)(P_3). The right option for the decreasing order of osmotic pressure of these solutions is :

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  15. 65
    Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?

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  16. 66
    Tritium, a radioactive isotope of hydrogen, emits which of the following particles?

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  17. 67
    The correct option for the number of body centred unit cells in all 14 types of Bravais lattice unit cells is :

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  18. 68
    The major product formed in dehydrohalogenation reaction of 2-Bromo pentane is Pent-2-ene. This product formation is based on?

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  19. 69
    The maximum temperature that can be achieved in blast furnace is :

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  20. 70
    The molar conductance of NaCl, HCl and CH3COONaCH_3COONa at infinite dilution are 126.45, 426.16 and 91.0 S  cm2  mol−1S \; cm^2 \; mol^{-1} respectively. The molar conductance of CH3COOHCH_3COOH at infinite dilution is. Choose the right option for your answer.

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  21. 71
    Ethylene diaminetetraacetate (EDTA) ion is :

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  22. 72
    The structures of beryllium chloride in solid state and vapour phase, are :

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  23. 73
    The correct structure of 2, 6-Dimethyl-dec-4-ene is

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  24. 74
    The right option for the statement "Tyndall effect is exhibited by", is :

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  25. 75
    Which one of the following polymers is prepared by addition polymerisation?

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  26. 76
    The RBC deficiency is deficiency disease of :

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  27. 77
    The correct sequence of bond enthalpy of 'C—X' bond is :

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  28. 78
    An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is : [Atomic wt. of C is 12, H is 1]

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  29. 79
    Among the following alkaline earth metal halides, one which is covalent and soluble in organic solvents is :

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  30. 80
    BF3BF_3 is planar and electron deficient compound. Hybridization and number of electrons around the central atom, respectively are :

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  31. 81
    The pKbpK_b of dimethylamine and pKapK_a of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for the pH of dimethylammonium acetate solution is :

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  32. 82
    Choose the correct option for graphical representation of Boyle's law, which shows a graph of pressure vs. volume of a gas at different temperatures :

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  33. 83
    For a reaction A→BA \rightarrow B, enthalpy of reaction is −4.2  kJ  mol−1-4.2 \; kJ \; mol^{-1} and enthalpy of activation is 9.6  kJ  mol−19.6 \; kJ \; mol^{-1}. The correct potential energy profile for the reaction is shown in option.

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  34. 84
    The compound which shows metamerism is :

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  35. 85
    Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of :

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  36. 86
    Match List-I with List-II.
    List-IList-II
    (a) [Fe(CN)6]3−[Fe(CN)_6]^{3-}(i) 5.92 BM
    (b) [Fe(H2O)6]3+[Fe(H_2O)_6]^{3+}(ii) 0 BM
    (c) [Fe(CN)6]4−[Fe(CN)_6]^{4-}(iii) 4.90 BM
    (d) [Fe(H2O)6]2+[Fe(H_2O)_6]^{2+}(iv) 1.73 BM
    Choose the correct answer from the options given below.

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  37. 87
    The reagent 'R' in the given sequence of chemical reaction is:
    2,4,6-tribromoaniline→0.5∘CNaNO2,  HCl2,4,6-tribromobenzenediazonium chloride→R1,3,5-tribromobenzene\text{2,4,6-tribromoaniline} \xrightarrow[0.5^\circ\text{C}]{NaNO_2, \; HCl} \text{2,4,6-tribromobenzenediazonium chloride} \xrightarrow{R} \text{1,3,5-tribromobenzene}

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  38. 88
    From the following pairs of ions which one is not an iso-electronic pair?

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  39. 89
    The slope of Arrhenius plot (ln⁡k  v/s  1T)\left(\ln k \; v/s \; \dfrac{1}{T}\right) of first order reaction is −5×103K-5 \times 10^3 K. The value of EaE_a of the reaction is. Choose the correct option for your answer. [Given R=8.314  JK−1mol−1R = 8.314 \; JK^{-1}mol^{-1}]

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  40. 90
    For irreversible expansion of an ideal gas under isothermal condition, the correct option is:

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  41. 91
    In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?

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  42. 92
    The intermediate compound 'X' in the following chemical reaction is:
    C6H5CH3+CrO2Cl2→CS2X→H3O+C6H5CHOC_6H_5CH_3 + CrO_2Cl_2 \xrightarrow{CS_2} X \xrightarrow{H_3O^+} C_6H_5CHO

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  43. 93
    The correct option for the value of vapour pressure of a solution at 45∘^\circC with benzene to octane in molar ratio 3 : 2 is : [At 45∘^\circC vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]

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  44. 94
    The molar conductivity of 0.007 M acetic acid is 20 S  cm2  mol−1S \; cm^2 \; mol^{-1}. What is the dissociation constant of acetic acid? Choose the correct option.
    ΛH+o=350  S  cm2  mol−1,ΛCH3COO−o=50  S  cm2  mol−1\Lambda^o_{H^+} = 350 \; S \; cm^2 \; mol^{-1}, \quad \Lambda^o_{CH_3COO^-} = 50 \; S \; cm^2 \; mol^{-1}

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  45. 95
    CH3CH2COO−Na+→HeatNaOH,+?CH3CH3+Na2CO3CH_3CH_2COO^-Na^+ \xrightarrow[\text{Heat}]{NaOH, +?} CH_3CH_3 + Na_2CO_3
    Consider the above reaction and identify the missing reagent/chemical.

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  46. 96
    Match List-I with List-II
    List-IList-II
    (a) C6H6→Anhyd. AlCl3/CuClCO,HClC_6H_6 \xrightarrow[\text{Anhyd. AlCl}_3/\text{CuCl}]{CO, HCl}(i) Hell-Volhard-Zelinsky reaction
    (b) R−CO−CH3+NaOX→R-CO-CH_3 + NaOX \rightarrow(ii) Gattermann-Koch reaction
    (c) R−CH2−OH+R′COOH→Conc. H2SO4R-CH_2-OH + R'COOH \xrightarrow{\text{Conc. H}_2SO_4}(iii) Haloform reaction
    (d) R−CH2COOH→(ii) H2O(i) X2/Red PR-CH_2COOH \xrightarrow[\text{(ii) H}_2O]{\text{(i) X}_2/\text{Red P}}(iv) Esterification
    Choose the correct answer from the options given below.

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  47. 97
    The product formed in the following chemical reaction is: (2-(2-methoxy-2-oxoethyl)-3-methylcyclohexan-1-one, i.e. a cyclohexanone ring bearing a −CH2−CO−OCH3-CH_2-CO-OCH_3 side chain and a −CH3-CH_3 group) →C2H5OHNaBH4\xrightarrow[C_2H_5OH]{NaBH_4} ?

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  48. 98
    Which of the following molecules is non-polar in nature?

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  49. 99
    Match List-I with List-II.
    List-IList-II
    (a) 2SO2(g)+O2(g)→2SO3(g)2SO_2(g) + O_2(g) \rightarrow 2SO_3(g)(i) Acid rain
    (b) HOCl(g)→hνO˙H+C˙lHOCl(g) \xrightarrow{h\nu} \dot{O}H + \dot{C}l(ii) Smog
    (c) CaCO3+H2SO4→CaSO4+H2O+CO2CaCO_3 + H_2SO_4 \rightarrow CaSO_4 + H_2O + CO_2(iii) Ozone depletion
    (d) NO2(g)→hνNO(g)+O(g)NO_2(g) \xrightarrow{h\nu} NO(g) + O(g)(iv) Tropospheric pollution
    Choose the correct answer from the options given below.

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  50. 100
    Choose the correct option for the total pressure (in atm.) in a mixture of 4 g O2O_2 and 2 g H2H_2 confined in a total volume of one litre at 0∘^\circC is : [Given R=0.082  L  atm  mol−1K−1,  T=273  KR = 0.082 \; L \; atm \; mol^{-1}K^{-1}, \; T = 273 \; K]

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Biology

100 questions

  1. 101
    Which of the following plants is monoecious?

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  2. 102
    A typical angiosperm embryo sac at maturity is:

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  3. 103
    Gemmae are present in

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  4. 104
    When the centromere is situated in the middle of two equal arms of chromosomes, the chromosome is referred as :

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  5. 105
    Which of the following stages of meiosis involves division of centromere?

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  6. 106
    The first stable product of CO2CO_2 fixation in Sorghum is

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  7. 107
    The factor that leads to Founder effect in a population is :

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  8. 108
    Which of the following is an incorrect statement?

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  9. 109
    Amensalism can be represented as:

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  10. 110
    The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as :

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  11. 111
    Which of the following algae contains mannitol as reserve food material?

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  12. 112
    Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?

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  13. 113
    Genera like SelaginellaSelaginella and SalviniaSalvinia produce two kinds of spores. Such plants are known as:

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  14. 114
    The site of perception of light in plants during photoperiodism is

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  15. 115
    Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called

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  16. 116
    Match List-I with List-II.
    List-IList-II
    (a) Cristae(i) Primary constriction in chromosome
    (b) Thylakoids(ii) Disc-shaped sacs in Golgi apparatus
    (c) Centromere(iii) Infoldings in mitochondria
    (d) Cisternae(iv) Flattened membranous sacs in stroma of plastids
    Choose the correct answer from the options given below.

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  17. 117
    Match List-I with List-II.
    List-IList-II
    (a) Cohesion(i) More attraction in liquid phase
    (b) Adhesion(ii) Mutual attraction among water molecules
    (c) Surface tension(iii) Water loss in liquid phase
    (d) Guttation(iv) Attraction towards polar surfaces
    Choose the correct answer from the options given below.

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  18. 118
    DNA strands on a gel stained with ethidium bromide when viewed under UV radiation, appear as

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  19. 119
    The term used for transfer of pollen grains from anthers of one plant to stigma of a different plant which, during pollination, brings genetically different types of pollen grains to stigma, is :

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  20. 120
    Which of the following algae produce Carrageen?

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  21. 121
    Which of the following statements is not correct?

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  22. 122
    In the equation GPP −- R = NPP R represents :

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  23. 123
    Diadelphous stamens are found in

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  24. 124
    When gene targetting involving gene amplification is attempted in an individual's tissue to treat disease, it is known as :

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  25. 125
    Match List-I with List-II.
    List-IList-II
    (a) Lenticels(i) Phellogen
    (b) Cork cambium(ii) Suberin deposition
    (c) Secondary cortex(iii) Exchange of gases
    (d) Cork(iv) Phelloderm
    Choose the correct answer from the options given below.

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  26. 126
    The production of gametes by the parents, formation of zygotes, the F1F_1 and F2F_2 plants, can be understood from a diagram called :

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  27. 127
    Which of the following is a correct sequence of steps in a PCR (Polymerase Chain Reaction)?

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  28. 128
    Mutations in plant cells can be induced by:

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  29. 129
    Match List-I with List-II
    List-IList-II
    (a) Protoplast fusion(i) Totipotency
    (b) Plant tissue culture(ii) Pomato
    (c) Meristem culture(iii) Somaclones
    (d) Micropropagation(iv) Virus free plants
    Choose the correct answer from the options given below.

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  30. 130
    During the purification process for recombinant DNA technology, addition of chilled ethanol precipitates out :

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  31. 131
    Complete the flow chart on central dogma. (a) [self-loop] DNA →(b)\xrightarrow{(b)} mRNA →(c)\xrightarrow{(c)} (d)

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  32. 132
    Which of the following is not an application of PCR (Polymerase Chain Reaction)?

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  33. 133
    The plant hormone used to destroy weeds in a field

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  34. 134
    Match List-I with List-II.
    List-IList-II
    (a) Cells with active cell division capacity(i) Vascular tissues
    (b) Tissue having all cells similar in structure and function(ii) Meristematic tissue
    (c) Tissue having different types of cells(iii) Sclereids
    (d) Dead cells with highly thickened walls and narrow lumen(iv) Simple tissue
    Select the correct answer from the options given below.

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  35. 135
    Which of the following are not secondary metabolites in plants?

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  36. 136
    Which of the following statements is incorrect?

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  37. 137
    Match Column-I with Column-II.
    Column-IColumn-II
    (a) NitrococcusNitrococcus(i) Denitrification
    (b) RhizobiumRhizobium(ii) Conversion of ammonia to nitrite
    (c) ThiobacillusThiobacillus(iii) Conversion of nitrite to nitrate
    (d) NitrobacterNitrobacter(iv) Conversion of atmospheric nitrogen to ammonia
    Choose the correct answer from options given below.

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  38. 138
    Match Column-I with Column-II.
    Column-I (Floral formula)Column-II (Family)
    (a) % (bisexual) K(5) C1+2+(2) A(9)+1 G‾1\%\ \text{(bisexual)}\ K_{(5)}\, C_{1+2+(2)}\, A_{(9)+1}\, \underline{G}_{1}(i) Brassicaceae
    (b) ⊕ (bisexual) K(5) C(5)‾ A5 G‾(2)\oplus\ \text{(bisexual)}\ K_{(5)}\, \overline{C_{(5)}}\, A_{5}\, \underline{G}_{(2)}(ii) Liliaceae
    (c) ⊕ (bisexual) P(3+3)‾ A3+3 G‾(3)\oplus\ \text{(bisexual)}\ \overline{P_{(3+3)}}\, A_{3+3}\, \underline{G}_{(3)}(iii) Fabaceae
    (d) ⊕ (bisexual) K2+2 C4 A2+4 G‾(2)\oplus\ \text{(bisexual)}\ K_{2+2}\, C_{4}\, A_{2+4}\, \underline{G}_{(2)}(iv) Solanaceae
    Select the correct answer from the options given below.

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  39. 139
    Identify the correct statement.

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  40. 140
    Which of the following statements is correct?

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  41. 141
    Select the correct pair.

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  42. 142
    DNA fingerprinting involves identifying differences in some specific regions in DNA sequence, called as

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  43. 143
    In some members of which of the following pairs of families, pollen grains retain their viability for months after release?

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  44. 144
    Which of the following statements is incorrect?

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  45. 145
    What is the role of RNA polymerase III in the process of transcription in eukaryotes?

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  46. 146
    In the exponential growth equation Nt=N0ertN_t = N_0 e^{rt}, e represents

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  47. 147
    Now a days it is possible to detect the mutated gene causing cancer by allowing radioactive probe to hybridise its complimentary DNA in a clone of cells, followed by its detection using autoradiography because :

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  48. 148
    Match List-I with List-II.
    List-IList-II
    (a) Protein(i) C = C double bonds
    (b) Unsaturated fatty acid(ii) Phosphodiester bonds
    (c) Nucleic acid(iii) Glycosidic bonds
    (d) Polysaccharide(iv) Peptide bonds
    Choose the correct answer from the options given below.

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  49. 149
    Match List-I with List-II.
    List-IList-II
    (a) S phase(i) Proteins are synthesized
    (b) G2G_2 phase(ii) Inactive phase
    (c) Quiescent stage(iii) Interval between mitosis and initiation of DNA replication
    (d) G1G_1 phase(iv) DNA replication
    Choose the correct answer from the options given below.

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  50. 150
    Plasmid pBR322 has PstI restriction enzyme site within gene ampRamp^R that confers ampicillin resistance. If this enzyme is used for inserting a gene for β\beta-galactoside production and the recombinant plasmid is inserted in an E.coliE.coli strain

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  51. 151
    Identify the incorrect pair

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  52. 152
    The fruit fly has 8 chromosomes (2n) in each cell. During interphase of Mitosis if the number of chromosomes at G1G_1 phase is 8, what would be the number of chromosomes after S phase?

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  53. 153
    Match List - I with List - II
    List-IList-II
    (a)Metamerism(I)Coelenterata
    (b)Canal system(ii)Ctenophora
    (c)Comb plates(iii)Annelida
    (d)Cnidoblasts(iv)Porifera
    Choose the correct answer from the options given below.

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  54. 154
    Match List-I with List-II.
    List-IList-II
    (a)Vaults(i)Entry of sperm through Cervix is blocked
    (b)IUDs(ii)Removal of Vas deferens
    (c)Vasectomy(iii)Phagocytosis of sperms within the Uterus
    (d)Tubectomy(iv)Removal of fallopian tube
    Choose the correct answer from the options given below

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  55. 155
    If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it?

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  56. 156
    Which of the following RNAs is not required for the synthesis of protein?

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  57. 157
    Which one of the following is an example of Hormone releasing IUD?

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  58. 158
    Succus entericus is referred to as:

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  59. 159
    Chronic auto immune disorder affecting neuro muscular junction leading to fatigue, weakening and paralysis of skeletal muscle is called as:

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  60. 160
    With regard to insulin choose correct options. (a) C-peptide is not present in mature insulin. (b) The insulin produced by rDNA technology has C-peptide. (c) The pro-insulin has C-peptide (d) A-peptide and B-peptide of insulin are interconnected by disulphide bridges. Choose the correct answer from the options given below

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  61. 161
    Which one of the following belongs to the family Muscidae?

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  62. 162
    Which is the "Only enzyme" that has "Capability" to catalyse Initiation, Elongation and Termination in the process of transcription in prokaryotes?

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  63. 163
    Receptors for sperm binding in mammals are present on :

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  64. 164
    The centriole undergoes duplication during:

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  65. 165
    Which one of the following organisms bears hollow and pneumatic long bones?

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  66. 166
    Erythropoietin hormone which stimulates R.B.C. formation is produced by:

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  67. 167
    Match the following:
    List-IList-II
    (a)Physalia(i)Pearl oyster
    (b)Limulus(ii)Portuguese Man of War
    (c)Ancylostoma(iii)Living fossil
    (d)Pinctada(iv)Hookworm
    Choose the correct answer from the options given below.

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  68. 168
    During the process of gene amplification using PCR, if very high temperature is not maintained in the beginning, then which of the following steps of PCR will be affected first?

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  69. 169
    Which of the following statements wrongly represents the nature of smooth muscle?

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  70. 170
    The organelles that are included in the endomembrane system are

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  71. 171
    Match List-I with List-II
    List-IList-II
    (a)Aspergillus niger(i)Acetic Acid
    (b)Acetobacter aceti(ii)Lactic Acid
    (c)Clostridium butylicum(iii)Citric Acid
    (d)Lactobacillus(iv)Butyric Acid
    Choose the correct answer from the options given below

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  72. 172
    For effective treatment of the disease, early diagnosis and understanding its pathophysiology is very important. Which of the following molecular diagnostic techniques is very useful for early detection?

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  73. 173
    Which of the following characteristics is incorrect with respect to cockroach?

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  74. 174
    Persons with 'AB' blood group are called as "Universal recipients". This is due to :

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  75. 175
    Dobson units are used to measure thickness of:

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  76. 176
    Read the following statements (a) Metagenesis is observed in Helminths. (b) Echinoderms are triploblastic and coelomate animals. (c) Round worms have organ-system level of body organization. (d) Comb plates present in ctenophores help in digestion. (e) Water vascular system is characteristic of Echinoderms. Choose the correct answer from the options given below.

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  77. 177
    In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?

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  78. 178
    Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?

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  79. 179
    Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

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  80. 180
    Sphincter of oddi is present at:

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  81. 181
    Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?

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  82. 182
    Which of the following is not an objective of Biofortification in crops?

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  83. 183
    The partial pressures (in mm Hg) of oxygen (O2O_2) and carbon dioxide (CO2CO_2) at alveoli (the site of diffusion) are:

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  84. 184
    Veneral diseases can spread through : (a) Using sterile needles (b) Transfusion of blood from infected person (c) Infected mother to foetus (d) Kissing (e) Inheritance Choose the correct answer from the options given below

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  85. 185
    A specific recognition sequence identified by endonucleases to make cuts at specific positions within the DNA is:

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  86. 186
    Which one of the following statements about Histones is wrong?

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  87. 187
    During muscular contraction which of the following events occur? (a) 'H' zone disappears (b) 'A' band widens (c) 'I' band reduces in width (d) Myosine hydrolyzes ATP, releasing the ADP and Pi. (e) Z-lines attached to actins are pulled inwards. Choose the correct answer from the options given below:

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  88. 188
    Match List-I with List-II
    List-IList-II
    (a)Scapula(i)Cartilaginous joints
    (b)Cranium(ii)Flat bone
    (c)Sternum(iii)Fibrous joints
    (d)Vertebral column(iv)Triangular flat bone
    Choose the correct answer from the options given below

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  89. 189
    Which of these is not an important component of initiation of parturition in humans ?

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  90. 190
    Assertion (A): A person goes to high altitude and experiences 'altitude sickness' with symptoms like breathing difficulty and heart palpitations. Reason (R): Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen. In the light of the above statements, choose the correct answer from the options given below

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  91. 191
    Following are the statements with reference to 'lipids'. (a) Lipids having only single bonds are called unsaturated fatty acids (b) Lecithin is a phospholipid. (c) Trihydroxy propane is glycerol. (d) Palmitic acid has 20 carbon atoms including carboxyl carbon. (e) Arachidonic acid has 16 carbon atoms. Choose the correct answer from the options given below.

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  92. 192
    The Adenosine deaminase deficiency results into

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  93. 193
    Which of the following secretes the hormone, relaxin, during the later phase of pregnancy?

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  94. 194
    Identify the types of cell junctions that help to stop the leakage of the substances across a tissue and facilitation of communication with neighbouring cells via rapid transfer of ions and molecules.

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  95. 195
    Which of the following is not a step in Multiple Ovulation Embryo Transfer Technology (MOET)?

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  96. 196
    Match List-I with List-II
    List-IList-II
    (a)Filariasis(i)Haemophilus influenzae
    (b)Amoebiasis(ii)Trichophyton
    (c)Pneumonia(iii)Wuchereria bancrofti
    (d)Ringworm(iv)Entamoeba histolytica
    Choose the correct answer from the options given below

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  97. 197
    Match List-I with List - II
    List-IList-II
    (a)Allen's Rule(i)Kangaroo rat
    (b)Physiological adaptation(ii)Desert lizard
    (c)Behavioural adaptation(iii)Marine fish at depth
    (d)Biochemical adaptation(iv)Polar seal
    Choose the correct answer from the options given below.

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  98. 198
    Match List-I with List-II
    List-IList-II
    (a)Adaptive radiation(i)Selection of resistant varieties due to excessive use of herbicides and pesticides
    (b)Convergent evolution(ii)Bones of forelimbs in Man and Whale
    (c)Divergent evolution(iii)Wings of Butterfly and Bird
    (d)Evolution by anthropogenic action(iv)Darwin Finches
    Choose the correct answer from the options given below.

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  99. 199
    Statement I: The codon 'AUG' codes for methionine and phenylalanine. Statement II: 'AAA' and 'AAG' both codons code for the amino acid lysine. In the light of the above statements, choose the correct answer from the options given below.

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  100. 200
    Following are the statements about prostomium of earthworm. (a) It serves as a covering for mouth. (b) It helps to open cracks in the soil into which it can crawl. (c) It is one of the sensory structures. (d) It is the first body segment. Choose the correct answer from the options given below.

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