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10 15. A transverse wave is represented by the equa 2n (ut-x). For what value of A tion y =y, sin is the maximum particle velocity equal to two times the wave velocity? 2ny. 2 = y, /2 1) 2 = y,/4 4) 2 = 2y, 3)

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a 12 gm of a solid solute is dissolvod in 90 gm pure water Vapour pressure of the reaulting solution is 750 mm Hg at 100°C temperature. Calculate molecular mass of the solute. [Solute does not undergo any dissociation or association in its 1+2 ricel wk chtined from the follanine aqucous solution.)

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2117 Weekly Quiz Results mg(1) Quualiun? A right triangular plate ABC of msss Mis free to rotate in the vertical plane abuul s fixed harizcntal axis tlruugh A. It is supported by Biring such thei the tide AB is hurizontal. The reacion al the support A in euuilbrium is A.

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(1-4x) (2-3x) (r) y= In

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8. The junction diode shown in fig is ideal. The current in the circuit is 1) 50A 10012 2) 30A 44V 3) 50mA 4) 30mA 9. The current from below circuit if forward resistance of the diode is 30o 1) 0.03A 2) 0.01A 701 -2V 3) 0,5A 4) 0.1A

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17. The current flow through the resistance in the5 given circuit is Ge Si + 12 V 1) 2.2 mA 2) 3.2 mA Sk0 3) 2.4 mA 4) 3 mA

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Ap -006 Omomel dlochy

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16. The potential difference across the diode is 1) 0.7 V Si 2) 8.7 V R-120 3) 7.3 V 4) 8 V

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Seven iketikal onim are rigily angad on a tan aie ia the puren town beke so te odi wahes ks wig on. Eah an is a tin dne sf ren mn ratiar Nee the the mornt af ireria af an istrideal min best ash pasdng threeghocare ndepentke the plane of te coir is wr'a 24. RE The ienis efte sa of sevea cein aleu a is pases hroegh de pi Pide cee ora: cin peitnd dratly the rig ef the ontralain ard rpeadkulr plare of the cne i

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2tanx + cot 1+tanx dx is equal to (B) e tan (A) e tan (D) none of these (C) e' tan is cqual to

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A 70 kg man standing on a weighing machine in a 50 kg lift pulls on the rope, which supports the lift as shown in the figure. Find the force with which the man should pull on the rope to keep the lift stationary and the weight of the man as shown by the weighing machine.

asked Jan 10, 2020 by balaji.thirumalai

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A sphere of mass M and radius R has a concentric cavity of radius R as shown in figure. The force Fexerted by the sphere on a particle of mass m located at a distance r from the centre of sphere varies as (0 sr s0) 4. (a) (b) (e) (d) Which one of the following graphs represents correctly the variafion 5.

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PRACTICE JD Which of these compounds represents the major monochlo Fination isomer formed in the following reactiont CH, C CH, CH, CH, CH CH (a) CH, не CH, CH, CH, CH (d) CH CH, CHICH (c) metal CI

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Which of the following is arranged in order of incrsasing acid strength in water? (a) [AKOH * <[Fe(11,0," < [ke(H,O)J (b) [Fe(H,OJ* < [Fe(HO* <[Al(H,O)J" (c) [Fe(HO<[Fe(H;O)<[AIHOJ (d) [Fe(HO)J JA(H,O< [Fe(H,O*

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the d) 6.85 s 3.4s 69. A capacitor of 5uF can withstand a potential difference of 2kv and another capacitor of capacitance 5uF can with stand Skv. The potential that can withstand if both capacitors are placed in series is a) 2 kv of b) 4 kv c) 6 kv d) 10 kv 70. A wire under tension vibrates with a

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fre fre tw 63. Half life of isotope x is 1.73 x 10". If decay to y which is stable then ratio of no. of atoms of x and y is 1: 7 in a sample then age of rock is a) 1.6 x 10° yrs c) 5.2 x 10° yrs 64. An under water swimmer is at a depth of 12m a) b) 9.5 x 10" yrs c) 71. A d) 5.2 x 100 yrs

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1. Among the following Lewis acids, which has the maximum electron- acceptor character? (a) PCI (c) PF (b) PCI,R (d) PCIR,

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HN. (4) 3<q<D (u) J<D<9 (4) 9<D<2 () () CH NH, "60 ; Basic strength order is: (OHN (4)NH, Organic Chemistry: Some Basic Principles and Techniques

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49. Arrange the following alcohols according to decreasing order of reactivity in dehydration reaction () CH,-CH-CH,-NO, (11) CH,-CH-CH,-CHO (111) CH,-CH-CH,-CN (IV) CH,-CH-CH,-C-CH, (1) 1> III > || > IV (2) 1> I| > III > IV (4) IV > III > I| > I (3) III > |> || > IV

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389. Arange the following compounds in decreasing order of their basic strength. CH, CH, CH, CH, H2 (a) (a) edab 396. Which is che sronpest base? (b) (h) d>a>b>c (c) (d) () b>a> d>c (d) a>b> d>

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bin 60 tran) Thom a =? (nrA" Tonar)+ Gra) b) 7 a) 5

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A Utube having uniform cross-section but unegual arm lengths (-1la aui,-Dn has same liquid of density a filled in it upto a heightna shoun in figure. Another liquid of density is poured in am A. Roth liquids are immiscible. What length of the second liquid should be poured in A so that finst overtone of A is in unison with fandamental tone of B. Neglect end cormection A) 20 cm See Chained B) 30 em spece fer reegwerk 40 cm Page 3

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