WB JEE 2017 | WB JEE Year Wise Previous Years Questions

Chemistry

1. For same mass of two different ideal gases of molecular weights M1 and M2, Plots of log V vs log p at a given constant t 2. Which of the following has the dimension if [$$M{L^0}{T^{ - 2}}$$] ? 3. If the given four electronic configurations.(i) n = 4, l = 1(ii) n = 4, l = 0(iii) n = 3, l = 2(iv) n = 3, l = 1are arra 4. Which of the following sets of quantum numbers represents the 19th electron of Cr(Z = 24) ? 5. 0.126 g of an acid is needed to completely neutralise 20 mL 0.1 (N) NaOH solution. The equivalent weight of the acid is 6. In a flask, the weight ratio of CH4(g) and SO2(g) at 298 K and 1 bar is 1 : 2. The ratio of the number of molecules of S 7. C6H5F18 is a F18 radio-isotope labelled organic compound. F18 decays by positron emission. The product resulting on deca 8. Dissolving NaCN in de-ionised water will result in a solution having 9. Among Me3N, C5H5N and MeCN (Me = methyl group) the electronegativity of N is in the order 10. The shape of $$XeF_5^ - $$ will be 11. The ground state magnetic property of B2 and C2 molecules will be 12. The number of unpaired electrons in $${[NiC{l_4}]^{2 - }}$$, $$Ni{(CO)_4}$$ and $${[Cu{(N{H_3})_4}]^{2 + }}$$ respective 13. Which of the following atoms should have the highest 1st electron affinity? 14. PbCl2 is insoluble in cold water. Addition of HCl increases its solubility due to 15. Of the following compounds, which one of the strongest Bronsted acid in a aqueous solution? 16. The correct basicity order of the following lanthanide ions is 17. When BaCl2 is added to an aqueous salt solution, a white precipitate is obtained. The anion among CO$$_3^{2 - }$$, SO$$_ 18. In the IUPAC system, PhCH2CH2CO2H is named as 19. The isomerisation of 1-butyne to 2-butyne can be achieved by treatment with 20. The correct order of acid strengths of benzoic acid (X), peroxybenzoic acid (Y) and p-nitrobenzoic acid (Z) is 21. The yield of acetanilide in the reaction (100% conversion) of 2 moles of aniline with 1 mole of acetic anhydride is 22. The structure of the product P of the following reaction is 23. ADP and ATP differ in the number of 24. The compound that would produce a nauseating smell/odour with a hot mixture of chloroform and ethanolic potassium hydrox 25. For the reaction belowthe structure of the product Q is 26. You are supplied with 500 mL each of 2N HCl and 5N HCl. What is the maximum volume of 3M HCl that you can prepare using 27. Which one of the following corresponds to a photon of highest energy? 28. Assuming the compounds to be completely dissociated in aqueous solution, identify the pair of the solutions that can be 29. How many faradays are required to reduce 1 mol of $$C{r_2}O_7^{2 - }$$ to Cr3+ in acid medium? 30. Equilibrium constants for the following reactions at 1200 K are given2H2O(g) $$\rightleftharpoons$$ 2H2(g) + O2(g), K1 = 31. In a close-packed body-centred cubic lattice of potassium, the correct relation between the atomic radius (r) of potassi 32. Which of the following solutions will turn violet when a drop of lime juice is added to it? 33. The reaction sequence given below given product R.The structure of the product R is 34. Reduction of the lactol S with sodium borohydride gives 35. What will be the normality of the salt solution obtained by neutralising x mL y (N) HCl with y mL x(N) NaOH, and finally 36. During electrolysis of molten NaCl, some water was added. What will happen? 37. The role of fluorspar, which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cr 38. The reduction of benzene diazonium chloride to phenyl hydrazine can be accomplished by 39. The major product(s) obtained form the following reaction of 1 mole of hexadeuteriobenzene is/are 40. The conversion of CH3 $$-$$ CH2 $$-$$ COOH to can be accomplished by

Mathematics

1. The number of all numbers having 5 digits, with distinct digits is 2. The greatest integer which divides $$(p + 1)(p + 2)(p + 3)...(p + q)$$ for all $$p \in N$$ and fixed $$q \in N$$ is 3. Let $${(1 + x + {x^2})^9} = {a_0} + {a_1}x + {a_2}{x^2} + ... + {a_{18}}{x^{18}}$$. Then, 4. The linear system of equations$$\left. \matrix{ 8x - 3y - 5z = 0 \hfill \cr 5x - 8y + 3z = 0 \hfill \cr 3x + 5y 5. Let P be the set of all non-singular matrices of order 3 over R and Q be the set of all orthogonal matrices of order 3 o 6. Let $$A = \left( {\matrix{ {x + 2} & {3x} \cr 3 & {x + 2} \cr } } \right),\,B = \left( {\matrix{ 7. The value of det A, where $$A\, = \left( {\matrix{ 1 & {\cos \theta } & 0 \cr { - \cos \theta } & 1 8. Let $$f:R \to R$$ be such that f is injective and $$f(x)f(y) = f(x + y)$$ for $$\forall x,y \in R$$. If f(x), f(y), f(z) 9. On the set R of real numbers we define xPy if and only if xy $$ \ge $$ 0. Then, the relation P is 10. On R, the relation $$\rho$$ be defined by 'x$$\rho$$y holds if and only if x $$-$$ y is zero or irrational'. Then, 11. Mean of n observations x1, x2, ...., xn is $$\overline x $$. If an observation xq is replaced by xq' then the new mean i 12. The probability that a non-leap year selected at random will have 53 Sunday is 13. The equation $$\sin x(\sin x + \cos x) = k$$ has real solutions, where k is a real number. Then, 14. The possible values of x, which satisfy the trigonometric equation $${\tan ^{ - 1}}\left( {{{x - 1} \over {x - 2}}} \rig 15. Transforming to parallel axes through a point (p, q), the equation $$2{x^2} + 3xy + 4{y^2} + x + 18y + 25 = 0$$ becomes 16. Let A(2, $$-$$3) and B($$-$$ 2, 1) be two angular points of $$\Delta$$ABC. If the centroid of the triangle moves on the 17. The point P(3, 6) is first reflected on the line y = x and then the image point Q is again reflected on the line y = $$- 18. Let d1 and d2 be the lengths of the perpendiculars drawn from any point of the line $$7x - 9y + 10 = 0$$ upon the lines 19. The common chord of the circles $${x^2} + {y^2} - 4x - 4y = 0$$ and $$2{x^2} + 2{y^2} = 32$$ subtends at the origin an 20. The locus of the mid-points of the chords of the circle $${x^2} + {y^2} + 2x - 2y - 2 = 0$$, which make an angle of 90$$ 21. Let P be the foot of the perpendicular from focus S of hyperbola $${{{x^2}} \over {{a^2}}} - {{{y^2}} \over {{b^2}}} = 1 22. B is an extremity of the minor axis of an ellipse whose foci are S and S'. If $$\angle SBS'$$ is a right angle, then the 23. The axis of the parabola $${x^2} + 2xy + {y^2} - 5x + 5y - 5 = 0$$ is 24. The line segment joining the foci of the hyperbola $${x^2} - {y^2} + 1 = 0$$ is one of the diameters of a circle. The eq 25. The equation of the plane through (1, 2, $$-$$3) and (2, $$-$$2, 1) and parallel to X-axis is 26. Three lines are drawn from the origin O with direction cosines proportional to (1, $$-$$1, 1), (2, $$-$$3, 0) and (1, 0, 27. Consider the non-constant differentiable function f one one variable which obeys the relation $${{f(x)} \over {f(y)}} = 28. If $$f(x) = {\log _5}{\log _3}x$$, then f'(e) is equal to 29. Let, $$F(x) = {e^x},G(x) = {e^{ - x}}$$ and $$H(x) = G(F(x))$$, where x is a real variable. Then, $${{dH} \over {dx}}$$ 30. If f'' (0) = k, k $$ \ne $$ 0, then the value of $$\mathop {\lim }\limits_{x \to 0} {{2f(x) - 3f(2x) + f(4x)} \over {{x^ 31. If $$y = {e^{m{{\sin }^{ - 1}}x}}$$ then $$(1 - {x^2}){{{d^2}y} \over {d{x^2}}} - x{{dy} \over {dx}} - $$ky = 0, where k 32. The chord of the curve $$y = {x^2} + 2ax + b$$, joining the points where x = $$\alpha$$ and x = $$\beta$$, is parallel t 33. Let $$f(x) = {x^{13}} + {x^{11}} + {x^9} + {x^7} + {x^5} + {x^3} + x + 19$$. Then, f(x) = 0 has 34. Let $$f(x) = \left\{ {\matrix{ {{{{x^p}} \over {{{(\sin x)}^q}}},} & {if\,0 < x \le {\pi \over 2}} \cr { 35. $$\mathop {\lim }\limits_{x \to 0} {(\sin x)^{2\tan x}}$$ is equal to 36. $$\int {\cos (\log x)dx} $$ = F(x) + C, where C is an arbitrary constant. Here, F(x) is equal to 37. $$\int {{{{x^2} - 1} \over {{x^4} + 3{x^2} + 1}}dx} $$ (x > 0) is 38. Let I = $$\left| {\int {_{10}^{19}{{\sin x} \over {1 + {x^8}}}dx} } \right|$$. Then, 39. Let $${I_1} = \int_0^n {[x]} \,dx$$ and $${I_2} = \int_0^n {\{ x\} } \,dx$$, where [x] and {x} are integral and fraction 40. The value of $$\mathop {\lim }\limits_{n \to \infty } \left[ {{n \over {{n^2} + {1^2}}} + {n \over {{n^2} + {2^2}}} + .. 41. The value of the integral $$\int_0^1 {{e^{{x^2}}}} dx$$ 42. $$\int_0^{100} {{e^{x - [x]}}} dx$$ is equal to 43. Solution of $${(x + y)^2}{{dy} \over {dx}} = {a^2}$$ ('a' belong a constant) is 44. The integrating factor of the first order differential equation $${x^2}({x^2} - 1){{dy} \over {dx}} + x({x^2} + 1)y = {x 45. In a GP series consisting of positive terms, each term is equal to the sum of next two terms. Then, the common ratio of 46. If $$({\log _5}x)({\log _x}3x)({\log _{3x}}y) = {\log _x}{x^3}$$, then y equals 47. The expression $${{{{(1 + i)}^n}} \over {{{(1 - i)}^{n - 2}}}}$$ equals 48. Let z = x + iy, where x and y are real. The points (x, y) in the X-Y plane for which $${{{z + i} \over {z - i}}}$$ is pu 49. If p, q are odd integers, then the roots of the equation $$2p{x^2} + (2p + q)x + q = 0$$ are 50. Out of 7 consonants and 4 vowels, words are formed each having 3 consonants and 2 vowels. The number of such words that 51. Let $$A = \left( {\matrix{ 1 & 1 & 1 \cr 0 & 1 & 1 \cr 0 & 0 & 1 \cr } } \right 52. Let a, b, c be such that b(a + c) $$ \ne $$ 0. If $$\left| {\matrix{ a & {a + 1} & {a - 1} \cr { - b} &a 53. On set A = {1, 2, 3}, relations R and S are given byR = {(1, 1), (2, 2), (3, 3), (1, 2), (2, 1)},S = {(1, 1), (2, 2), (3 54. If one of the diameters of the curve x2 + y2 $$-$$ 4x $$-$$ 6y + 9 = 0 is a chord of a circle with centre (1, 1), the ra 55. Let A($$-$$ 1, 0) and B(2, 0) be two points. A point M moves in the plane in such a way that $$\angle MBA$$ = 2$$\angle 56. If $$f(x) = \int_{ - 1}^x {|t|} \,dt$$, then for any $$x \ge 0,\,f(x)$$ is equal to 57. Let for all x > 0, $$f(x) = \mathop {\lim }\limits_{n \to \infty } n({x^{1/n}} - 1)$$, then 58. Let $$I = \int_0^{100\pi } {\sqrt {(1 - \cos 2x)} } \,dx$$, then 59. The area of the figure bounded by the parabolas x = $$-$$ 2y2 and x = 1 $$-$$ 3y2 is 60. Tangents are drawn to the ellipse $${{{x^2}} \over 9} + {{{y^2}} \over 5} = 1$$ at the ends of both latusrectum. The ar 61. The value of K in order that f(x) = sin x $$-$$ cos x $$-$$ kx + 5 decreases for all positive real values of x is given 62. For any vector x, where $$\widehat i$$, $$\widehat j$$, $$\widehat k$$ have their usual meanings the value of $${(x \tim 63. If the sum of two unit vectors is a unit vector, then the magnitude of their difference is 64. Let $$\alpha$$ and $$\beta$$ be the roots of $${x^2} + x + 1 = 0$$. If n be a positive integer, then $$\alpha$$n + $$\be 65. For real x, the greatest value of $${{{x^2} + 2x + 4} \over {2{x^2} + 4x + 9}}$$ is 66. If a, b$$ \in $$ {1, 2, 3} and the equation ax2 + bx + 1 = 0 has real roots, then 67. If the tangent to $${y^2} = 4ax$$ at the point $$(a{t^2},2at)$$ where | t | > 1 is a normal to $${x^2} - {y^2} = {a^2 68. The focus of the conic x2 $$-$$ 6x + 4y + 1 = 0 is 69. Let f : R $$ \to $$ R be twice continuously differentiable. Let f(0) = f(1) = f'(0) = 0. Then, 70. If f(x) = xn, being a non-negative integer, then the values of n for which f'($$\alpha$$ + $$\beta$$) = f'($$\alpha$$) + 71. Let f be a non-constant continuous function for all x $$ \ge $$ 0. Let f satisfy the relation f(x) f(a $$-$$ x) = 1 for 72. If the line ax + by + c = 0, ab $$ \ne $$ 0, is a tangent to the curve xy = 1 $$-$$ 2x, then 73. Two particles move in the same straight line starting at the same moment from the same point in the same direction. The 74. The complex number z satisfying the equation | z $$-$$ 1 | = | z + 1 | = 1 is 75. On R, the set of real numbers, a relation $$\rho $$ is defined as 'a$$\rho $$b if and only if 1 + ab > 0'. Then,

Physics

1. The velocity of a particle executing a simple harmonic motion is 13 ms$$-$$1, when its distance from the equilibrium pos 2. A uniform string of length L and mass M is fixed at both ends while it is subject to a tension T. It can vibrate at freq 3. A uniform capillary tube of length l and inner radius r with its upper end sealed is submerged vertically into water. Th 4. A liquid of bulk modulus k is compressed by applying an external pressure such that its density increases by 0.01%. The 5. Temperature of an ideal gas, initially at 27$$^\circ$$C, is raised by 6$$^\circ$$C. The rms velocity of the gas molecule 6. 2 moles of an ideal monoatomic gas is carried from a state (p0, V0) to state (2p0, 2V0) along a straight line path in a 7. A solid rectangular sheet has two different coefficients of linear expansion $$\alpha$$1 and $$\alpha$$2 along its lengt 8. A positive charge Q is situated at the centre of a cube. The electric flux through any face of the cube is (in SI units) 9. Three capacitors of capacitance 1.0, 2.0 and 5.0 $$\mu$$F are connected in series to a 10 V source. The potential differ 10. A charge of 0.8 coulomb is divided into two charges Q1 and Q2. These are kept at a separation of 30 cm. The force on Q1 11. The magnetic field due to a current in a straight wire segment of length L at a point on its perpendicular bisector at 12. The magnets of two suspended coil galvanometers are of the same strength so that they produce identical uniform magnetic 13. A proton is moving with a uniform velocity of $${{{10}^6}}$$ ms$$-$$1 along the Y-axis, under the joint action of a magn 14. When the frequency of the AC voltage applied to a series LCR circuit is gradually increased from a low value, the impeda 15. Six wires, each of resistance r, are connected so as to form a tetrahedron. The equivalent resistance of the combination 16. Consider the circuit shown in the figure.The value of the resistance X for which the thermal power generated in it is pr 17. Consider the circuit shown in the figure where all the resistances are of magnitude 1 k$$\Omega$$. If the current in the 18. The ratio of the diameter of the sun to the distance between the earth and the sun is approximately 0.009. The approxima 19. Two monochromatic coherent light beams A and B have intensities L and $${{L \over 4}}$$, respectively. If these beams ar 20. A point object is held above a thin equiconvex lens at its focus. The focal length is 0.1 m and the lens rests on a hori 21. A parallel beam of light is incident on a glass prism in the shape of a quarter cylinder of radius R = 0.05 m and refrac 22. The de-Broglie wavelength of an electron is $$0.4 \times {10^{ - 10}}$$ m when its kinetic energy is 1.0 keV. Its wavele 23. When light of frequency v1 is incident on a metal with work function W (where hv1 > W), then photocurrent falls to ze 24. Radon-222 has a half-life of 3.8 days. If one starts with 0.064 kg of radon-222 left after 19 days will be 25. In the given circuit, the binary inputs at A and B are both 1 in one case and both 0 in the next case. The respective ou 26. When a semiconducting device is connected in series with a battery and a resistance, a current is found to flow in the c 27. The dimension of the universal constant of gravitation, G is 28. Two particles A and B (both initially at rest) start moving towards each other under a mutual force of attraction. At th 29. Three vectors $$\overrightarrow A $$ = a$$\widehat i$$ + $$\widehat j$$ + $$\widehat k$$; $$\overrightarrow B $$ = $$\wi 30. A block of mass 1 kg starts from rest at x = 0 and moves along the X-axis under the action of a force F = kt, where t is 31. A particle with charge Q coulomb, tied at the end of an inextensible string of length R metre, revolves in a vertical pl 32. A bullet of mass 4.2 $$ \times $$ 10$$-$$2 kg, moving at a speed of 300 ms$$-$$1, gets stuck into a block with a mass 9 33. A particle with charge e and mass m, moving along the X-axis with a uniform speed u, enters a region where a uniform ele 34. A unit negative charge with mass M resides at the mid-point of the straight line of length 2a adjoining two fixed charge 35. Consider the circuit given here. The potential difference VBC between the points B and C is 36. If the pressure, temperature and density of an ideal gas are denoted by p, T and $$\rho $$, respectively, the velocity o 37. Two long parallel wires separated by 0.1 m carry currents of 1A and 2A, respectively in opposite directions. A third cur 38. If $$\chi $$ stands for the magnetic susceptibility of a substance, $$\mu$$ for its magnetic permeability and $$\mu$$0 f 39. Let vn and En be the respective speed and energy of an electron in the nth orbit of radius rn, in a hydrogen atom, as pr 40. A small steel ball bounces on a steel plate held horizontally. On each bounce the speed of the ball arriving at the plat

WB JEE 2017

MCQ (Single Correct Answer)

-0.25

A uniform string of length L and mass M is fixed at both ends while it is subject to a tension T. It can vibrate at frequencies (v) given by the formula (where n = 1, 2, 3, ....)

$$v = {n \over 2}\sqrt {{T \over {ML}}} $$

$$v = {n \over {2L}}\sqrt {{T \over M}} $$

$$v = {1 \over {2n}}\sqrt {{T \over {ML}}} $$

$$v = {n \over 2}\sqrt {{{TL} \over M}} $$

WB JEE 2017

MCQ (Single Correct Answer)

-0.25

A uniform capillary tube of length l and inner radius r with its upper end sealed is submerged vertically into water. The outside pressure is p₀ and surface tension of water is $$\gamma$$. When a length x of the capillary is submerged into water, it is found that water levels inside and outside the capillary coincide. The value of x is

$${l \over {\left( {1 + {{{p_0}r} \over {4\gamma }}} \right)}}$$

$$\left( {1 - {{{p_0}r} \over {4\gamma }}} \right)$$

$$\left( {1 - {{{p_0}r} \over {2\gamma }}} \right)$$

$${l \over {\left( {1 + {{{p_0}r} \over {2\gamma }}} \right)}}$$

WB JEE 2017

MCQ (Single Correct Answer)

-0.25

A liquid of bulk modulus k is compressed by applying an external pressure such that its density increases by 0.01%. The pressure applied on the liquid is

$${k \over {10000}}$$

$${k \over {1000}}$$

1000 k

0.01 k

WB JEE 2017

MCQ (Single Correct Answer)

-0.25

Temperature of an ideal gas, initially at 27$$^\circ$$C, is raised by 6$$^\circ$$C. The rms velocity of the gas molecules will

increase by nearly 2%

decrease by nearly 2%

increase by nearly 1%

decrease by nearly 1%