Chemistry
1. Copper is extracted from copper pyrites by 2. Function of potassium ethyl xanthate in froth floatation process is to make the ore 3. Sulphide ore on roasting gives a gas $$X$$. $$X$$ reacts with $$\mathrm{Cl}_2$$ in the presence of activated charcoal to 4. Aqueous solution of a salt $$(A)$$ forms a dense white precipitate with $$\mathrm{BaCl}_2$$ solution. The precipitate di 5. Bond angle is $$\mathrm{PH}_4^{+}$$ is more than that of $$\mathrm{PH}_3$$. This is because 6. Incorrectly matched pair is 7. Phosphorus pentachloride 8. Identify the set of paramagnetic ions among the following. 9. How many moles of acidified $$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$$ is required to liberate 6 moles of $$\mathrm{I}_ 10. For $$\mathrm{Cu}_2 \mathrm{Cl}_2$$ and $$\mathrm{CuCl}_2$$ in aqueous medium, which of the following statement is corre 11. The coordination number of $$\mathrm{Fe}$$ and $$\mathrm{Co}$$ in the complex ions, $$\left.\mathrm{Fe}\left(\mathrm{C}_ 12. Number of stereoisomers exhibited by $$\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]^{+}$$ is 13. Give the IUPAC name of $$\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_4\right]\left[\mathrm{Pt} \mathrm{Cl}_4\right]$$ is 14. Prolonged exposure of chloroform in humans may cause damage to liver. It is due to the formation of the following compou 15. Which of the following halide shows highest reactivity towards $$\mathrm{S}_{\mathrm{N}} 1$$ reaction? 16. In the reaction,
The number of possible isomers for the organic compound X is 17. Which of the following on heating gives an ether as major products?
(P) $$\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}_2 \mathr 18. The steps involved in the conversion of propan -2-ol to propan -1-ol are in the order
19. Which of the following is the strongest base? 20. The product 'P' is
21. Which of the following has the lowest boiling point? 22. The carbonyl compound that does not undergo aldol condensation is 23. The final product for the reaction is
24. Hinsberg's reagent is 25. Which one of the following vitamins is not stored in adipose tissue? 26. Hypothyroidism is caused by the deficiency of 27. $$\mathrm{C}_1-\mathrm{C}_4$$ glycosidic bond is not found in 28. Which of the following polymer has strongest intermolecular forces of attraction? 29. Which of the following monomers can undergo condensation polymerisation? 30. A food additive that acts as an antioxidant is 31. Which of the following is not related to drug-enzyme interaction? 32. $$0.4 \mathrm{~g}$$ of dihydrogen is made to react with $$7.4 \mathrm{~g}$$ of dichlorine to form hydrogen chloride. The 33. With regard to photoelectric effect, identify the correct statement among the following. 34. The last element of the $$p$$-block in 6 th period is represented by the outer most electronic configuration. 35. The conjugate base of $$\mathrm{NH}_3$$ is 36. A gas mixture contains $$25 \% \mathrm{~He}$$ and $$75 \% \mathrm{~CH}_4$$ by volume at a given temperature and pressure 37. The percentage of $$s$$-character in the hybrid orbitals of nitrogen in $$\mathrm{NO}_2^{+}, \mathrm{NO}_3^{-}$$ respect 38. The formal charge on central oxygen atom in ozone is 39. When the same quantity of heat is absorbed by a system at two different temperatures $$T_1$$ and $$T_2$$, such that $$T_ 40. The oxidation number of nitrogen atoms in $$\mathrm{NH}_4 \mathrm{NO}_3$$ are 41. A Lewis acid '$$X$$' reacts with $$\mathrm{LiAlH}_4$$ in ether medium to give a highly toxic gas. This gas when heated w 42. The oxide of potassium that does not exist is 43. The metal that produce $$\mathrm{H}_2$$ with both dil. $$\mathrm{HCl}$$ and $$\mathrm{NaOH}(a q)$$ is 44. Which of the following is not a pair of functional isomers? 45. Identify 'X' in the following reaction.
46. Which of the following is not a green house gas? 47. A metal exists as an oxide with formula $$M_{0.96}$$ O. Metal, $$M$$ can exist as $$M^{2+}$$ and $$M^{3+}$$ in its oxide 48. A metal crystallises in face centred cubic structure with metallic radius $$\sqrt{2} \mathop A\limits^o$$. The volume of 49. Silicon doped with gallium forms 50. The pair of electrolytes that posses same value for the constant $$(A)$$ in the Debye-Huckel-Onsager equation, $$\Lambda 51. Which of the following pair of solutions is isotonic? 52. Solute '$$X$$' dimerises in water to the extent of $$80\%$$. 2.5g of '$$X$$' in $$100 \mathrm{~g}$$ of water increases t 53. Given $$E_{F{e^{3 + }}/F{e^{2 + }}}^o = + 0.76\,V$$ and $$E_{\mathrm{I}_2 / \mathrm{I}^{-}}^0=+0.55 \mathrm{~V}$$. The 54. If an aqueous solution of $$\mathrm{NaF}$$ is electrolysed between inert electrodes, the product obtained at anode is 55. In which of the following cases a chemical reaction is possible? 56. The time required for $$60 \%$$ completion of a first order reaction is $$50 \mathrm{~min}$$. The time required for $$93 57. For an elementary reaction $$2 A+3 B \rightarrow 4 C+D$$ the rate of appearance of $C$ at time '$$T$$' is $$2.8 \times 1 58. The rate constant of a reaction is given by $$k=P Z e^{-E_a / R T}$$ under standard notation. In order to speed up the r 59. A sol of $$\mathrm{AgI}$$ is prepared by mixing equal volumes of $$0.1 \mathrm{~M} \mathrm{~AgNO}_3$$ and $$0.2 \mathrm{ 60. During adsorption of a gas on a solid at low temperature
Mathematics
1. If $$2^x+2^y=2^{x+y}$$, then $$\frac{d y}{d x}$$ is 2. If $$f(x)=\sin ^{-1}\left(\frac{2 x}{1+x^2}\right)$$, then $$f^{\prime}(\sqrt{3})$$ is 3. The right hand and left hand limit of the function are respectively.
$$f(x)=\left\{\begin{array}{cc}
\frac{e^{1 / x}-1}{ 4. If $$y=2 x^{n+1}+\frac{3}{x^n}$$, then $$x^2 \frac{d^{2 y}}{d x^2}$$ is 5. If the curves $$2 x=y^2$$ and $$2 x y=K$$ intersect perpendicularly, then the value of $$K^2$$ is 6. If $$(x e)^y=e^y$$, then $$\frac{d y}{d x}$$ is 7. If the side of a cube is increased by $$5 \%$$, then the surface area of a cube is increased by 8. The value of $$\int \frac{1+x^4}{1+x^6} d x$$ is 9. The maximum value of $$\frac{\log _e x}{x}$$, if $$x>0$$ is 10. The value of $$\int e^{\sin x} \sin 2 x d x$$ is 11. The value of $$\int_{-1 / 2}^{1 / 2} \cos ^{-1} x d x$$ is 12. If $$\int \frac{3 x+1}{(x-1)(x-2)(x-3)} d x A \log |x-1| B \log |x-2|+C \log |x-3|+C$$, then the values of $$A, B$$ and 13. Find the value of $$\int_0^1 \frac{\log (1+x)}{1+x^2} d x$$ is 14. The area of the region bounded by the curve $$y^2=8 x$$ and the line $$y=2 x$$ is 15. The value of $$\int_{-\pi / 2}^{\pi / 2} \frac{\cos x}{1+e^x} d x$$ is 16. The order of the differential equation obtained by eliminating arbitrary constants in the family of curves $$c_1 y=\left 17. The general solution of the differential equation $$x^2 d y-2 x y d x=x^4 \cos x d x$$ is 18. The area of the region bounded by the line $$y=2 x+1, X$$-axis and the ordinates $$x=-1$$ and $$x=1$$ is 19. The two vector $$\hat{\mathbf{i}}+\hat{\mathbf{j}}+\hat{\mathbf{k}}$$ and $$\hat{\mathbf{i}}+3 \hat{\mathbf{j}}+5 \hat{\ 20. If $$\mathbf{a}$$ and $$\mathbf{b}$$ are unit vectors and $$\theta$$ is the angle between $$\mathbf{a}$$ and $$\mathbf{b 21. The curve passing through the point $$(1,2)$$ given that the slope of the tangent at any point $$(x, y)$$ is $$\frac{3 x 22. If $$|\mathbf{a}+\mathbf{b}|^2+|\mathbf{a} \cdot \mathbf{b}|^2=144|\mathbf{a}|=6$$, then $$|\mathbf{b}|$$ is equal to 23. The point $$(1,-3,4)$$ lies in the octant 24. If the vectors $$2 \hat{\mathbf{i}}+3 \hat{\mathbf{j}}+4 \hat{\mathbf{k}}, 2 \hat{\mathbf{i}}+\hat{\mathbf{j}}-\hat{\mat 25. The distance of the point $$(1,2,-4)$$ from the line $$\frac{x-3}{2}=\frac{y-3}{3}=\frac{z+5}{6}$$ is 26. The sine of the angle between the straight line $$\frac{x-2}{3}=\frac{3-y}{-4}=\frac{z-4}{5}$$ and the plane $$2 x-2 y+z 27. If a line makes an angle of with each of $$X$$ and $$Y$$-axis, then the acute angle made by Z-axis is 28. Corner points of the feasible region determined by the system of linear constraints are $$(0,3),(1,1)$$ and $$(3,0)$$. L 29. The feasible region of an LPP is shown in the figure. If $$z=11 x+7 y$$, then the maximum value of $$Z$$ occurs at
30. A die is thrown 10 times, the probability that an odd number will come up at least one time is 31. If $$A$$ and $$B$$ are two events such that $$P(A)=\frac{1}{3}, P(B)=\frac{1}{2}$$ and $$P(A \cap B)=\frac{1}{6}$$, then 32. Events $$E_1$$ and $$E_2$$ from a partition of the sample space $$S$$. $$A$$ is any event such that $$P\left(E_1\right)= 33. The probability of solving a problem by three persons $$A, B$$ and $$C$$ independently is $$\frac{1}{2}, \frac{1}{4}$$ a 34. If $$n(A)=2$$ and total number of possible relations from Set A to set B is 1024, then $$n(B)$$ is 35. The value of $$\sin ^2 51^{\circ}+\sin ^2 39^{\circ}$$ is 36. If $$\tan A+\cot A=2$$, then the value of $$\tan ^4 A+\cot ^4 A=$$ 37. If $$A=\{1,2,3,4,5,6\}$$, then the number of subsets of A which contain at least two elements is 38. If $$z=x+i y$$, then the equation $$|z+1|=|z-1|$$ represents 39. The value of $${ }^{16} C_9+{ }^{16} C_{10}-{ }^{16} C_6-{ }^{16} C_7$$ is 40. The number of terms in the expansion of $$(x+y+z)^{10}$$ is 41. If $$P(n): 2^n 42. The two lines $$l x+m y=n$$ and $$l^{\prime} x+m^{\prime} y=n^{\prime}$$ are perpendicular if 43. If the parabola $$x^2=4$$ ay passes through the point $$(2,1)$$, then the length of the latus rectum is 44. If the sum of $$n$$ terms of an AP is given by $$S_n=n^2+n$$, then the common difference of the $$\mathrm{AP}$$ is 45. The negation of the statement "For all real numbers $$x$$ and $$y, x+y=y+x^{\prime \prime}$$ is 46. The standard deviation of the data 6, 7, 8, 9, 10 is 47. $$\lim _\limits{x \rightarrow 0}\left(\frac{\tan x}{\sqrt{2 x+4}-2}\right) \text { is equal to }$$ 48. If a relation $$R$$ on the set $$\{1,2,3\}$$ be defined by $$R=\{(1,1)\}$$, then $$R$$ is 49. Let $$f:[2, \infty) \rightarrow R$$ be the function defined $$f(x)=x^2-4 x+5$$, then the ranges of $$f$$ is 50. If $$A, B, C$$ are three mutually exclusive and exhaustive events of an experiment such that $$P(A)=2 P(B)=3 P(C)$$, the 51. The domain of the function defined by $$f(x)=\cos ^{-1} \sqrt{x-1}$$ is 52. The value of $$\cos \left(\sin ^{-1} \frac{\pi}{3}+\cos ^{-1} \frac{\pi}{3}\right)$$ is
Does not exist 53. If $$A=\left(\begin{array}{lll}0 & 0 & 1 \\ 0 & 1 & 0 \\ 1 & 0 & 0\end{array}\right)$$ then $$A^4$$ is equal to 54. If $$A=\{a, b, c\}$$, then the number of binary operations on $$A$$ is 55. If $$\left(\begin{array}{ll}2 & 1 \\ 3 & 2\end{array}\right) A=\left(\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right)$$ 56. If $$f(x)=\left|\begin{array}{ccc}x^3-x & a+x & b+x \\ x-a & x^2-x & c+x \\ x-b & x-c & 0\end{array}\right|$$, then 57. If $$A$$ and $$B$$ are square matrices of same order and $$B$$ is a skew symmetric matrix, then $$A^{\prime} B A$$ is 58. If $$A$$ is a square matrix of order 3 and $$|A|=5$$, then $$\mid A$$ adj. $$A \mid$$ is 59. If $$f(x)=\left\{\begin{array}{cc}\frac{1-\cos K x}{x \sin x}, & \text { if } x \neq 0 \\ \frac{1}{2}, & \text { if } x= 60. If $$a_1 a_2 a_3 \ldots a_9$$ are in AP, then the value of $$\left|\begin{array}{lll}a_1 & a_2 & a_3 \\ a_4 & a_5 & a_6
Physics
1. The value of acceleration due to gravity at a height of $$10 \mathrm{~km}$$ from the surface of earth is $$x$$. At what 2. Young's modulus of a perfect rigid body is 3. A wheel starting from rest gains an angular velocity of $$10 \mathrm{~rad} / \mathrm{s}$$ after uniformly accelerated fo 4. Iceberg floats in water with part of it submerged. What is the fraction of the volume of iceberg submerged, if the densi 5. A sphere, a cube and a thin circular plate all of same material and same mass initially heated to same high temperature 6. In an adiabatic expansion of an ideal gas the product of pressure and volume 7. A certain amount of heat energy is supplied to a monoatomic ideal gas which expands at constant pressure. What fraction 8. A tray of mass $$12 \mathrm{~kg}$$ is supported by two identical springs as shown in figure. When the tray is pressed do 9. A train whistling at constant frequency $$n$$ is moving towards a station at a constant speed $$v$$. The train goes past 10. A point charge $$q$$ is placed at the corner of a cube of side $$a$$ as shown in the figure. What is the electric flux t 11. The electric field lines on the left have twice the separation on those on the right as shown in figure. If the magnitud 12. An infinitely long thin straight wire has uniform charge density of $$\frac{1}{4} \times 10^{-2} \mathrm{~cm}^{-1}$$. Wh 13. A dipole moment $$p$$ and moment of inertia $$I$$ is placed in a uniform electric field $$\mathbf{E}$$. If it is displac 14. The difference between equivalent capacitances of two identical capacitors connected in parallel to that in series is $$ 15. Figure shows three points $$A, B$$ and $$C$$ in a region of uniform electric field $$\mathbf{E}$$. The line $$A B$$ is p 16. When a soap bubble is charged? 17. A hot filament liberates an electron with zero initial velocity. The anode potential is $$1200 \mathrm{~V}$$. The speed 18. A metal rod of length $$10 \mathrm{~cm}$$ and a rectangular cross-section of $$1 \mathrm{~cm} \times \frac{1}{2} \mathrm 19. A car has a fresh storage battery of emf $$12 \mathrm{~V}$$ and internal resistance $$2 \times 10^{-2} \Omega$$. If the 20. A potentiometer has a uniform wire of length $$5 \mathrm{~m}$$. A battery of emf $$10 \mathrm{~V}$$ and negligible inter 21. The colour code for a carbon resistor of resistance $$0.2 \mathrm{k} \Omega \pm 10 \%$$ is 22. Each resistance in the given cubical network has resistance of $$1 \Omega$$ and equivalent resistance between $$A$$ and 23. $$I-V$$ characteristic of a copper wire of length $$L$$ and area of cross-section $$A$$ is shown in figure. The slope of 24. In the given figure, the magnetic field at $$O$$.
25. The magnetic field at the origin due to a current element $$i d \mathbf{l}$$ placed at a point with vector position $$\m 26. A long cylindrical wire of radius $$R$$ carries a uniform current $$I$$ flowing through it. The variation of magnetic fi 27. A cyclotron is used to accelerate protons $$\left({ }_1^l \mathrm{H}\right)$$ deuterons $$\left({ }_1^2 \mathrm{H}\right 28. A paramagnetic sample shows a net magnetisation of $$8 \mathrm{Am}^{-1}$$ when placed in an external magnetic field of $ 29. The ratio of magnetic field at the centre of a current carrying circular coil to its magnetic moment is $$x$$, if the cu 30. In a permanent magnet at room temperature 31. A rod of length $$2 \mathrm{~m}$$ slides with a speed of $$5 \mathrm{~ms}^{-1}$$ on a rectangular conducting frame as sh 32. The current in a coil of inductance $$0.2 \mathrm{H}$$ changes from $$5 \mathrm{~A}$$ to $$2 \mathrm{~A}$$ in $$0.5 \mat 33. In the given circuit the peak voltage across $$C, L$$ and $$R$$ are $$30 \mathrm{~V}, 110 \mathrm{~V}$$ and $$60 \mathrm 34. The power factor of $$R-L$$ circuit is $$\frac{1}{\sqrt{3}}$$. If the inductive reactance is $$2 \Omega$$. The value of 35. In the given circuit, the resonant frequency is
36. A light beam of intensity $$20 \mathrm{~W} / \mathrm{cm}^2$$ is incident normally on a perfectly reflecting surface of s 37. An object approaches a convergent lens from the left of the lens with a uniform speed $$5 \mathrm{~m} / \mathrm{s}$$ and 38. The refracting angle of prism is $$A$$ and refractive index of material of prism is $$\cot \frac{A}{2}$$. The angle of m 39. The following figure shows a beam of light converging at point $$P$$. When a concave lens of focal length $$16 \mathrm{~ 40. Three polaroid sheets $$P_1, P_2$$ and $$P_3$$ are kept parallel to each other such that the angle between pass axes of 41. Two poles are separated by a distance of $$3.14 \mathrm{~m}$$. The resolving power of human eye is $$1 \mathrm{~min}$$ o 42. In Young's double slit experiment, the distance between the slits and the screen is $$1.2 \mathrm{~m}$$ and the distance 43. The de-Broglie wavelength associated with electron of hydrogen atom in this ground state is 44. The following graph represents the variation of photocurrent with anode potential for a metal surface. Here $$I_1, I_2$$ 45. The period of revolution of an electron revolving in nth orbit of $$\mathrm{H}$$-atom is proportional to 46. Angular momentum of an electron in hydrogen atom is $$\frac{3 h}{2 \pi}$$ ($$h$$ is the Planck's constant). The KE of th 47. A beam of fast moving alpha particles were directed towards a thin film of gold. The parts $$A, B$$ and $$C$$ of the tra 48. Two protons are kept at a separation of $$10 \mathrm{~nm}$$. Let $$F_n$$ and $$F_e$$ the nuclear force and the electroma 49. During a $$\beta^{-}$$-decay 50. A radio-active elements has half-life of 15 years. What is the fraction that will decay in 30 years? 51. A $$220 \mathrm{~V}$$ AC supply is connected between points $$A$$ and $$B$$ as shown in figure, what will be the potenti 52. In the following circuit what are P and Q
53. A positive hole in a semiconductor is 54. Two long straight parallel wires are a distance $$d$$ part. They carry steady equal currents flowing out of the plane of 55. A cylindrical wire has a mass $$(0.3 \pm 0.003) \mathrm{g}$$, radius $$(0.5 \pm 0.005) \mathrm{mm}$$ and length $$(6 \pm 56. At a metro station, a girl walks up a stationary escalator in $$20 \mathrm{~s}$$. If she remains stationary on the escal 57. Rain is falling vertically with a speed of $$12 \mathrm{~ms}^{-1}$$. A woman rides a bicycles with a speed of $$12 \math 58. One end of a string of length $$l$$ is connected to a particle of mass $$m$$ and the other to a small peg on a smooth ho 59. A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it a 60. A thin uniform rectangular plate of mass $$2 \mathrm{~kg}$$ is placed in $$x y$$-plane as shown in figure. The moment of
1
KCET 2020
MCQ (Single Correct Answer)
+1
-0
In which of the following cases a chemical reaction is possible?
A
$$\mathrm{ZnSO}_4(a q)$$ is placed in a copper vessel
B
$$\mathrm{AgNO}_3$$ solution is stirred with a copper spoon
C
Conc. $$\mathrm{HNO}_3$$ is stored in a platinum vessel
D
gold ornaments are washed with dil. $$\mathrm{HCl}$$
2
KCET 2020
MCQ (Single Correct Answer)
+1
-0
The time required for $$60 \%$$ completion of a first order reaction is $$50 \mathrm{~min}$$. The time required for $$93.6 \%$$ completion of the same reaction will be
A
100 min
B
83.8 min
C
50 min
D
150 min
3
KCET 2020
MCQ (Single Correct Answer)
+1
-0
For an elementary reaction $$2 A+3 B \rightarrow 4 C+D$$ the rate of appearance of $C$ at time '$$T$$' is $$2.8 \times 10^{-3} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~S}^{-1}$$. Rate of disappearance of $$B$$ at '$$t$$' $t$ will be
A
$$\frac{4}{3}\left(2.8 \times 10^{-3}\right) \mathrm{mol} \mathrm{~L}^{-1} \mathrm{~S}^{-1}$$
B
$$\frac{3}{4}\left(2.8 \times 10^{-3}\right) \mathrm{mol} \mathrm{~L}^{-1} \mathrm{~S}^{-1}$$
C
$$2\left(2.8 \times 10^{-3}\right) \mathrm{mol} \mathrm{~L}^{-1} \mathrm{~S}^{-1}$$
D
$$\frac{1}{4}\left(2.8 \times 10^{-3}\right) \mathrm{mol} \mathrm{~L}^{-1} \mathrm{~S}^{-1}$$
4
KCET 2020
MCQ (Single Correct Answer)
+1
-0
The rate constant of a reaction is given by $$k=P Z e^{-E_a / R T}$$ under standard notation. In order to speed up the reaction, which of the following factors has to be decreased?
A
Z
B
Both Z and T
C
$$E_a$$
D
T