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7. Experimental verification of Newton's law of coolingis valid for -(A) large temperature difference i.e.30°C to 85°C between hot liquid and surrounding(B) very large temperature difference i.e. 5°C to 95°Cbetween hot liquid and surrounding(C) small temperature difference i.e. 30°C to 35°Cbetween hot liquid and surrounding(D) any temperature difference8. While studying the dissipation of energy of a simplependulum by plotting a graph between square ofamplitude and time which of the following apparatusis not essential ?(A) Ticker timer (B) Meter scale(C) Vernier calliper (D) Stop watch9. An object is weighed on a balance whose pans arenot equal in masses when placed in the left pan, theobject appears to weigh 10.30g but when placed inthe right pan, it appears to weigh 12.62g. What is thecorrect mass of the object ?(A) 10.30 g (B) 12.62 g(C) 11.46 g (D) Can not find10. When jockey is put at two ends of the potentiometerwire, the galvanometer gives diflections in oppositedirections. It means that apparatus can -(A) not give a null point(B) give a null point(C) be faulty(D) be used after making some changes in the circuit11. A student performs an experiment to determine theYoung's modulus of a wire exactly 2cm long, by Searle'smethod. In a particular reading, the student measures theextension in the length of the wire to be 0.8 mm with anuncertainty of ± 0.05 mm at a load of exactly 1.0 kg.The student also measures the diameter of the wire tobe 0.4 mm with an uncertainty of ± 0.01 mm. Takeg = 9.8 m/s 2 (exact). The Young's modulus obtainedfrom the reading is -(A) (2.0 ± 0.3) × 10 11 N/m 2(B) (2.0 ± 0.2) × 10 11 N/m 2(C) (2.0 ± 0.1) × 10 11 N/m 2(D) (2.0 ± 0.05) × 10 11 N/m 212. A student measures the focal length of a convex lensby putting an object pin at a distance 'u' from the lensand measuring the distance 'v' of the image pin. Thegraph between 'u' and 'v' plotted by the student shouldlook like -(A)v(cm)Ou(cm)(B)u(cm)v(cm)O(C)v(cm)Ou(cm)(D)u(cm)v(cm)13. Two concave mirror each of focal length f. A pointsource is placed at a point midway between twomirror. The minimum value of d for which only oneimage of s is formed –(A) f(C) 3fsd(B) 2f(D) 4f14. In YDSE, if the intensity of central maxima is I O thenIthe y-coordinate of point where the intensity is O, 2d = 0.1 mm, D = 1m,λ = 5000A°(A) 1.5 mmd(C) 1.75 mmD(B) 2 mmPOy(D) 1.25 mm15. Two charges of –4µC and +4µC are placed at pointsA (1,0,4) and B (2, –1,5) located in an electric field→E = 0.20 î V/cm. The torque acting on the dipoleis-(A) 8 × 10 –5 N-m (B) 8/ 2 × 10 –5 N-m(C) 8 2 × 10 –5 N-m (D) 2 2 × 10 –5 N-m16. Three concentric spherical metallic shells A, B and Cof radii a, b and c (a < b < c) have surface chargedensities σ, – σ and σ respectively. If the shells Aand C are at same potential, then the correct relationbetween a, b and c is -(A) a + c = b (B) b + c = a(C) a – b = c (D) a + b = cOXtraEdge for IIT-JEE 70APRIL 2010
17. Five identical plates of equal area A are placedparallel to and at equal distance d from each other asshown in figure. The effective capacity of the systembetween the terminals A and B is -(A) 53(C) 35∈ o∈ oAdAd(B) 45(D) 54∈ o∈ oBAAdA18. Read the following statements carefully :Y : The resistivity of semiconductor decreases withincrease of temperature.Z : In a conducting solid, the rate of collisionbetween free electrons and ions increases withincrease of temperature.(A) Both Y and Z are true and Z is correctexplaination of Y(B) Both Y and Z are true but Z is not correctexplaination of Y(C) Y is true but Z is false(D) Y is false but Z is true19. A 1m long metallic wire is broken into two unequalparts A and B. The part A is uniformly extended intoanother wire C. The length of C is twice the length ofA and resistance of C is equal to that of B. The ratioof resistances of parts A and C is -(A) 4 (B) 41(C) 2 (D) 2120. A 600 cm long potentiometer wire is connected to acircuit as shown in figure. The resistance ofpotentiometer wire is 15r. The distance from pointA at which the jockey should touch the wire to getzero deflection in the galvanometer is –AE/2(A) 320 cm(C) 160 cmrEGJrdB(B) 230 cm(D) 460 cm21. A rectangular loop of metallic wire is of length a andbreadth b and carries a current i. The magnetic fieldat the centre of the loop is -(A)µ 0 i4π8µ 0 i 2(C)4π2a +2b(B)ab2a +2b(D)abµ 0 i 44πµ 0 i4π2a +2bab2a +2bab22. A short magnet produces a deflection of 30° when placedat certain distance in tanA position of magnetometer. Ifanother short magnet of double the length and thrice thepole strength is placed at the same distance in tanBposition of the magnetometer, the deflection producedwill be -(A) 60° (B) 30°(C) 45°(D) None of these23. A solenoid has 2000 turns wound over a length of 0.30 m.Its area of cross-section is 1.2 × 10 –3 m 2 . Around itscentral section a coil of 300 turns is wound. If aninitial current of 2A in the solenoid is reversed in0.25 sec, the emf induced in the coil is equal to -(A) 6 × 10 –4 Volt (B) 4.8 × 10 –2 Volt(C) 6 × 10 –2 Volt (D) 48 kV24. A 100 volt AC source of frequency 500 Hz isconnected to a L–C-R circuit with L = 8.1 mH,C = 12.5 µF and R = 10 Ω, all connected in series.The potential difference across the resistance is -(A) 100 V(B) 200 V(C) 300 V(D) 400 V25. Which one is correct ?(A) Resultant of two vectors of unequal magnitudecan be zero(B) Resultant of three non-coplanar vectors of equalmagnitude can be zero(C) Resultant of three coplanar vectors is always zero(D) Minimum number of non-coplanar vectors whoseresultant can be zero is four.26. A stone thrown with the velocity V 0 = 14 m/s at anangle 45° to the horizontal, dropped to the ground ata distance 'S' from the point where it was thrown.From what height should the stone be thrown inhorizontal direction with the same initial velocity sothat it fall at the same spot -(A) 14.2 m(B) 16.9 m(C) 10.0 m(D) 9.6 m27. A small body of mass 'm' is attached to one end of alight inelastic string of length l. The other end of thestring is fixed. The string is held initially taut andhorizontal and then body is released. The centripetalacceleration of the body and the tension in the stringwhen the string reaches vertical position will be -(A) g, mg(B) 2g, 3 mg(C) 3g, 2mg (D) 3g, 3 mgXtraEdge for IIT-JEE 71APRIL 2010
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Volume - 5 Issue - 10April, 2010 (M
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Volume-5 Issue-10April, 2010 (Month
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Hospital in Parel and ApolloHospita
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KNOW IIT-JEEBy Previous Exam Questi
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CHEMISTRY6. From the following data
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(ii)OHH + CH 3OH⊕PorClPClClOCH 3O
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Physics Challenging ProblemsSet #12
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8 QuestionsSolutionSet # 11Physics
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8 QuestionsSolutionSet # 12Physics
Page 22 and 23: PHYSICSSStudents'ForumExpert’s So
Page 24 and 25: If the body loses this heat in time
Page 26 and 27: Perfect gas equation :From the kine
Page 28 and 29: The internal energy of n molecules
Page 30 and 31: * The binding energy per nucleon is
Page 32 and 33: KEY CONCEPTOrganicChemistryFundamen
Page 34 and 35: KEY CONCEPTPhysicalChemistryFundame
Page 36 and 37: UNDERSTANDINGOrganic Chemistry1. An
Page 38 and 39: The starting compound (A) reacts wi
Page 40 and 41: `tà{xÅtà|vtÄ V{tÄÄxÇzxá12Se
Page 43 and 44: MATHEMATICAL CHALLENGESSOLUTION FOR
Page 45 and 46: A 2 ⎛ 3s − 2s ⎞ s≤ s ⎜
Page 47 and 48: 5. Let z 1 , z 2 and z 3 are unimod
Page 49 and 50: If I n =∫x n . e ax dx, then I n
Page 51 and 52: The common difference of an A.P. is
Page 53 and 54: XtraEdge for IIT-JEE 51APRIL 2010
Page 55 and 56: 4. Consider the following reactions
Page 57 and 58: 15. What would be the structure of
Page 59 and 60: 14. If line lies inside the region
Page 61: 6. A BTwo containers A & B contain
Page 64 and 65: MOCK TEST FOR IIT-JEEPAPER - IITime
Page 66 and 67: SECTION - IVInteger answer typeThis
Page 68 and 69: X Y Z W0123456789012345678912. If z
Page 70 and 71: (C) Pressure at A > pressureat B(D)
Page 74 and 75: 28. Assertion : A rocket moves forw
Page 76 and 77: 60. Point out the incorrect stateme
Page 78 and 79: MOCK TEST - BIT-SATTime : 3 Hours T
Page 80 and 81: 22. The displacement of interfering
Page 82: 40. A body of mass 2 kg is being dr
Page 85 and 86: 10. The foci of a hyperbola coincid
Page 87 and 88: LOGICAL REASONING1. Fill in the bla
Page 89 and 90: SOLUTION FOR MOCK TESTIIT-JEE (PAPE
Page 91 and 92: or 0.1 v α + 1 = 2 + 2 × 10 -2 ×
Page 93 and 94: 12.[A, B, C, D]13.[B]2x t − 5t +
Page 95 and 96: R l=sin 45º sin 30ºR sin 45º = =
Page 97 and 98: 1.[C]2.[B]3.[B]SOLUTION FOR MOCK TE
Page 99 and 100: 5.[A,B,D] We have adj A = |A| A -1a
Page 101 and 102: (1, 1)7λ 5.5× 10t min = =P4n 4×1
Page 103 and 104: K TFor a cylinder = 2 in case ofK R
Page 105 and 106: ∴17.[C]Potential of shell A is,1
Page 107 and 108: 39.[B] Solution is decinormal, that
Page 109 and 110: 71.[B]which is a H.P.n th term of c
Page 111 and 112: 85.[C] Letters of word 'STATISTICS'
Page 113 and 114: 13. [B] Point P lies on the arms CD
Page 115 and 116: 33. [B] For quarter revolution∆ V
Page 117 and 118: 16.[A]NH 2⎯ 0−5°C+ NaNO 2 + 2H
Page 119 and 120: 11.[B]→ →∴ α & β are two mu
Page 121 and 122: 1/ 21 -2∫2 x 2 dx⇒⇒01 2 - 3 2
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8.[A]9.[A]10.[B]To take off :irrele
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CAREER POINTIn associationwithLaunc
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