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(chatquestion)...In a Young's double slit experiment, separation d is 0.3 mm and the screen distance D is 1 m. A parallel beam of light of wavelength incident on the slits at angle a as shown in figure. On the Q.1 Screen the slit y 600 is d. the point O is screen, equidistant from the slits and distance PO Which of the following statements(s) is/are correct ? is 11.0 mm. D

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(chatquestion)...T/2 ln= ent GBt o +sins

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(chatquestion)...ulll 47 10:52 PM math.stackexchange.com/c 2 Answers order by votes Since you asked about the indefinite integral, I will introduce a couple of identities and definitions: dt li(æ) = / (1) Int li(x) = Ei(ln æ) (2) -t Ei(=») = - dt. -x Where li(x) is the logarithmic integral, and Ei(x) is the exponential integral. Start by using the substitution you attempted, it is a good one: x = e' + dx = e' dt Hence giving: e7t · et dt dx In x 8t dt dt dt = Substituting u = 8t on the green integral and applying (3), we have: est dt = Ei(u) + cı = Ei du (8 ln æ) + c1

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(chatquestion)...スサーユ dc 4. tog(I)

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(chatquestion)...tog(I)

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(chatquestion)...Iska ans. Do 10:19 PM Jaldi yaar 10:19 PM PP 10:19 PM c6studenthelpbot JuPranav PAT Hu Photo new question submitted to tutor...For solution, please follow this link...157754... 10:19 PM Pranav PAT 10:19 PM 10:20 PM 10:20 PM 10:20 PM Message

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(chatquestion)...(u= 44+13)2

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(chatquestion)...11. Assertior through a 75. A long straight wire along the Z-axis carries a current I in the negative z-direction. The magnefic vector field B at a point having coordinates (x. vlin el Reason the z = 0 plane is magnetic HoMlxî + yĵ) Hvi -xj) (a) 2 Tlx? + y) (b) 12. Assertio: Som 2 πιχ+ y) region of circle, th. Hllkj– yî) HMxî – yî) (c) 2 Tlx + y) (d) 2 πίχ2+y") Reason region, a F =q E meaning

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(chatquestion)...(u 44 +13)²

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(chatquestion)...14. A student performs an experiment on photoelectric effect using two materials A and B. A plot of stopping potential (Vo) vs frequency (v) is as shown in the figure. PARA tertid nsdA o) (Mg b) arlall A colar () 3. wolloj 2.5 2 1.5 Subotords motton 10 x 10 V(Hz) 5 x 10" 15 x 10 The value of h obtained from the experiment for both A and B respectively is (Given electric charge of an electron = 1.6 x 10-19 C) (a) 3.2 x 10-34 Js, 4 x 10-34 J s (b) 6.4 x 10-34 J s, 8 x 10-34 J s (c) 1.2 x 10-34 Js, 3.2 x 10-34 J s (d) 4.2 x 10-34 J s, 5 x 10-34 J s Rbns A uch ilintom 2aal e) kups (o)

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(chatquestion)...D) mg + F.cos0 Q44 Two radioactive materials X and Y initially contain equal number of atoms. Their half life is 1 hour and 2 hours respectively. What is ratio of rates of disintegration after two hours ? B) 4. /2 1/4 D) 2 45 There is a circular coil of radius R carrying current I. There is a point on the axis of circular coil at a distance r from the centre B is magnetic feld intensit

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(chatquestion)...Arrange the following compounds in order of increasing boiling point. Explain 2-methylpentane hexane 2,3-dimethylbutane 2,2-dimethylpentane

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(chatquestion)...1). 2) 3). 55. If the tangent (1, 7) to the +y +16x+12y+c=0 then the value of c is at curve x = y-6 touches the circle $6 (N E and Q are two distinct points on the parabola, y-4x, with parameters t and respectively. If the nørmal at P passes through Q, then the value of ti is -2,2) meets the 2) 195 3) 185 4) 85 56. 1) 4 9 (7 The normal to the curve, x²+2xy-3y = 0, at (1, 1) 3) 8 4) 2 57. 1) does not meet the curve again 2) meets the curve again in the second quadrant 3) meets the curve again in the third quadrant +2 4) meets the curve again in the fourth quadrant 58. If two tangents drawn from a point P to the parabola y = 4x are at right angles then the locus of P is and Normals Dr.K.K.R's Gowtham 461 Tangents and Normals

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(chatquestion)...1) 2x+1=0 2) X 59. If a chord, which is not a tangent, of the parabola y = 16x has the equation 2x + y = p, and midpoint (h, k), then which of the following is possible value of p, h and k ? 1) p= 2, h= 3, k=4 %3D 2) p = 5, h = 4, k =-3 3) p=-1, h = 1, k =-3 4) p =-2, h = 2, k =-4

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(chatquestion)...0. The function f : [0, 3] → [1, 29], defined by f(x) = 2x -15x + 36x + 1, is %3D 2) onto but not one-one 1) one-one and onto 4) neither one-one nor onto 3) one-one but not onto

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(chatquestion)...(2) Hydrogen molecule (3) Proton (2 (3 (4) Hydrogen atom (4 10. Which one is most stable free radical : 15. T Me CH, fr (1) (2) Radical inudia (3) CH,=CH-CH, (4) CH, Ċ-CH, CH 11. Which is wrong electrom

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(chatquestion)...en molecule (2) IV > II > III> (3) III > I> II > IV (4) III > I > IV > II (4) HC=C atom post stable free radical: 15. The correct order of stability of following carbo CH, free radical is :- Picric (2) Radical inudud nxeso (CH, ), C -CH, (4) CH, Ċ-CH, (1) (2) CH, Corbol meric effect: CH,CH,CH, CH, (3) (4) Canbe (1) 1 > 2 > 3 > 4 (2) 4 > 3 > 2 > 1 H-CH-CH, (3) 2 > 3 > 1 > 4 (4) 2 > 1 > 3 > 4 ENGMODULE 3\03 GOC-Ino2-EXERCISE P65

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(chatquestion)...Pre-Medical: Chemistry 18. The correct order of acidic strength is :- (1) CH,COOH < HCN < H,O < CH,OH (2) CH,COOH > HCN > H,O > C,H,OH (3) HCN > CH,COOH > H,O > C,H OH (4) CH,COOH > HCN > C,H,OH > H,0 HO- -CH,OH Which of the follwing orders of acid strength is 19. correct :- (1) RCOOH > ROH> HOH> HC CH (2) RCOOH > HOH > ROH> HC3CH (3) RCOOH> HOH> HC CH> ROH (4) RCOOH> HC CH> HOH > ROH ONa CH OH

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(chatquestion)...Is dried by using conc.H,SO4 (c) Oxidising power of halogens follow the order I, > Br, > Cl, y (d) HIs the strongest acid among HI, HBr, HCI, (a, b andd are correct (2) a, c are correct ベソニーナーてy (b) Fluorine have highest oxidising power (3) b, c are corrects 5. (4) c, d are correct Chromyl chloride test is performed for the confirmation of the presence of the following in mixture: (1) SO,- (2) Cr*++ The ion that cannot undergo disproportionation is 3) CH (4) Cr** and CH 6. Y CIO, (2) CIO, (3) CIO, (4) CIO 7. A greenish yellow gas reacts with an alkali metal hydroxide to form a halate which can be used in fire works and safety matches. The gas and halate respectively are : (4) Cl, NaCIO (1) Br2, KBRO3 (2) Cl2, KCIO, (3) 2, NalO3 In the clatherates of xenon with water, the nature of bonding between xenon and water molecule is : (4)dipole-induced dipole interaction 8. (3) co-ordinate (2) hydrogen bonding (1) covalent XeF, reacts with PF, to give : 9. 2. (4) [PF* [XeF,F (3) XeF4 (2(XeF]* [PF (1) XeF, The first compound of noble gases prepared by Neil-Bartlett was :- (2) XeF, 10. (4) XeOF, (3) XeF, Xe+ [PTFJ OUER KEY

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(chatquestion)...LLEN EXERCISE-III (Analytical Consider the following state (a) CH,OCH, is more (b) Mez CH is mor (c) CH, CH CH asie. CH-CH less bosie D-Orlucosamine - opne 3800mo2 Choto 2 methylPentyl) 3Boomo Schlaro

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(chatquestion)...B7

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(chatquestion)...stry oids in decreasing order of 47. Which of the following moleculec on rea ALLEM EXERCISE-III CH,CH,O Na gives aromatic species : COOH Consider the fo (2) (1) (a) CH,OCH (b) Me, CH COOH (3) (4) OV) (c) CH 1>N>l> (4) IV>I> >1 of th

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(chatquestion)...14. A student performs an experiment on photoelectric effect using two materials A and B. A plot of stopping potential (Vo) vs frequency (v) is as shown in the figure. PARA tertid nsdA o) (Mg b) arlall A colar () 3. wolloj 2.5 2 1.5 Subotords motton 10 x 10 V(Hz) 5 x 10" 15 x 10 The value of h obtained from the experiment for both A and B respectively is (Given electric charge of an electron = 1.6 x 10-19 C) (a) 3.2 x 10-34 Js, 4 x 10-34 J s (b) 6.4 x 10-34 J s, 8 x 10-34 J s (c) 1.2 x 10-34 Js, 3.2 x 10-34 J s (d) 4.2 x 10-34 J s, 5 x 10-34 J s Rbns A uch ilintom 2aal e) kups (o)

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(chatquestion)...(4) b, c andd are correct 2. Which hydrogen in the following hydrogen is most acidic :- CH,-CH,-CH,-CH (2) C, H (1) C,-H (3) C,-H (4) C,-H Which of the following has the most acidic proton: 3.

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(chatquestion)...ин CAt,

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(chatquestion)...fm

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(chatquestion)...NEET-II 2016 CH3- 31. In pyrrole (3) CH3- C CH = C 4. (4) CH2 C %D CH > C 35. Which one The electron density is maximum on :- (1) (1) 2 and 4 (2) 2 and 5 (3) 2 and 3 (4) 3 and 4 ON (3)

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(chatquestion)...74. Which one of the following is most stable carbocation. Он ÇI (2) (1) H NO, H NO, ҫн, NHCOCH, (3) (4) H NO, H NO,

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(chatquestion)...(OR) b) The following chemical reaction is occurring in a electrochemical cell Mg(s)+2Ag" (0.0001M)--Mg (0.10M)+2Ag(S) Mg/Mg = -2.36V, Ag"/Ag=D0.81V. Calculate Standard potential E of the cell The cell potential or e.m.f of the cell The symbolic representation of the cell AG for the cell State whether the above cell reaction be spontaneous or not and why. (i) (ii) (iii) (iv) (v)

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(chatquestion)...T-1 Pre-Medical : Chemistry ng compounds 26. Correct order of K, is Ph CH,NH, NH, Ph -C- Ph CH, (i) (II) (III) (iii) CH,CH,-NH, (iv) H,C-C-NH, urs In :- (3) I and III (4) I only (1) iv > iii > ii > i (2) iii > i > ii > iv (3) i > ii > iii > iv (4) ii > iii > iv > i СH, Н.С CH, AIIMS 2015

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(chatquestion)...Q.46 Enthalpy of carbon, hydrogen and ethyl alcohol on combustion at 25°C are -94.0, -68.4 and -327.0 kcal per mole, then the enthalpy of formation of ethyl alcohol will be A) -66.2 kcal mole B) 58.2 kcal/mole 60.2 kcal/mole D) 60.4 kcalmole

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(chatquestion)...19.2K/s L J 4:35 PM 4G VOLTE 61% Hy SOy Cenc P Block GR.. M2 S207 Scanned by CamScanner O Drthionic Auid ио- OM -Co] |9t Lontaluy s -s bond in it 1IT P. S-S bond in ? present i's HO - S- S-on C. Peroxopnono sulp luric Aid/Caro's Auid /He so, и OH Scanned by CamScanner Peroxodis ulplugc aud /Marshalls acid IM_S208 0ニこ。

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(chatquestion)...16. Current enters at mid-point of AB and leaves at C of a isosceles triangle where AC = BC. The magnetic field at the centre of triangle ABC is (where R is the length of side AB) %3D (2) 4TR Zero (3) (4) TR (3

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(chatquestion)...dn aqueous solution of an organic compound X on electrolysis liberate's acetylene and carbondioxide at anode X is B potassium succinate D) potassium maleate A) potassium acetate C) potossium citrate Q.65 In aqueous solutions, the basic strength of amines decreases in the order.

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(chatquestion)...OR R defined by f(x) = |x \, then f(1) – f(-1) is equal to Let f: R

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(chatquestion)...MnO, is a good oxidising agent in different medium changing to MnO, → Mn* → MnO¯ → Mn, → Mn,O, changes in oxidation number respectively, are A) 1, 3, 4, 5 C) 5, 1, 3, 4 B 5, 4, 3, 2 D) 2, 6, 4, 3

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(chatquestion)...(3) Desert (4) Alpine Which biome is specialised by thick covering of snow year to year ? (1) Tropical rain forest A2) Tundra biome (3) Taiga biome (4) Grassland Savana biome is characterised by : 3. J2) Grasses with scattered trees (1) Only grasses (4) All of the above (3) Broad leaf trees Which is not a reservoir for phosphorous in phosphorous cycle ? (2) Lithosphere 4. W Atmosphere. (3) Hydrosphere (4) All of the above 34 2.

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(chatquestion)...24. An LC circuit contains inductor (L = 25 mH) and capacitor (C = 25 mF) with an initial charge Q. After what time will be circuit have equal amount of electrical and magnetic energy? (Initial current is zero) %3D 5 (nis even) s(nis odd) (2) 160 (1) 160 2.7 (3) Only 160 (4) Only 160

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(chatquestion)...w. 2. [^ /-

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(chatquestion)...10. The rms value of the current in a series LCR circ is plotted with angular frequency as shown below The ohmic resistance is R, inductance is L and capacitance isC in the circuit The välue of the difference (@-@) is 0.707 L. 1 (3) VIC (4) 2LC (2)

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(chatquestion)...(a) 0.8 A6 ΙΚΩ 6ΚΩ 3. 3ΚΩ 5V 2ΚΩ For the given transistor circuit VRF = 0.7 V. Find I (a) 3.7 mA (b) 2.2 mA (c) 1.8 mA (d) 1.5 mA www www

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(chatquestion)...temperatures. All heat entering the face A goes out of the end the sides of the bar. The effective thermal conductivity of the bar is B there being no loss of heat from и9 (1) 15K/16 (2) 6K/13 (3) 5K/16 (4) 2K/13. Q.81 Figure shows three different arrangements of materials 1,2 and 3 to form a wall. Thermal conductivities are k,>k,>k. The left side of the wall is 20°C higher than the right side. Temperature difference AT across the material I has following relation in three cases: 3. (1) AT,>AT,>AT. (3) AT, =AT, > AT. (2) AT, = AT, = AT, (4) AT, = AT, <AT, Q.82 A 2cm thick slab of commercial thermocole, 100 cm2 in cross-section and having thermal conductivity 2 x 104 cal sec-l cm- (C°)-! has insulating regions differing by 100°C. The quantity of heat flowing through it in a day will be - (1) 20.4 kcal (2) 43.2 kcal (3) 86.4 kcal (4) 63.6 kcal

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(chatquestion)...(4) Van Arkel process air i- (1) 4. Chemical leaching is useful in the concentration of (1) copper pyrites (2 (2) bauxite (3) galena (4) lead 5. Self-reduction of CuS to Cu can be carried out in. (1) bessemer convertor (2) blast furnace (3) both (1) and (2) (4) none of these 11. NaCN is sometimes added in the forth flotation cant when ZnS and PbS

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(chatquestion)...Two stars A and B radiate maximum energy at wave lengths 4000Å and 5000Å respectivey. The ratio of their temperature will be – (1) 1: 2 2.66 (2) 2:1 (3) 4 :5 (4) 5: 4 Q.67 Wein's displacement law is shown by the following relation 2T=b then the curve drawn between log T and log m wil be - (1)Log Am Log m (2) (3) Log m (4) Log 2m Log T Log T Log T Log T D.68 A continuous flow water heater (geyser) has an electrical power rating=2kW and efficienty of conversion of electrical power into heat 80%. If water is flowing through the device at the rate of 100 cc/sec, and the inlet temperature is 10°C, the outlet temperature will be %3D (1) 12.2°C (2) 13.8°C (3) 20°C (4) 16.5°C

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(chatquestion)...The major product of the following reaction is: Н.С NH2 (i) NaNO,/H (ii) C:CO,/H (iii) H,SO, (conc.),A НО. (1) CH, (2) (3) CH, НО. (4)

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(chatquestion)...ons is a single-digit integer, ranging from 0 to 9 questions numbered 71 Family of curves satisfy (9-x) dy 9-y and infinite members of the family touch the line dx ax+by 11for m ordered pairs of a and b, then m is equal to 1. is then f If t(t)at-1- sinx vxe 72 TO Space for rough work KI2

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(chatquestion)...47. Product +H-Br The product is - (1) Bí НО (2) НО Br (3) Br (4) Br

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(chatquestion)...y components ALLEW Pre Madisl Ples res of directional. 1.9 Projection of A on n In scalar form Projection of A on BAcos -A AR AR resultant of A& netur form Projection of A on B-(Acoo yA (AB AA (H) Tllustrations tion remains remains so A+8=10 ন magnitude veen them and negati Ant Bn = Bn = uct of 36+1 ত Br tar'(t)

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