Recent questions tagged other

(chatquestion)...23. The de-Broglie wavelength of an electron is the same as that of a 50 keV X-ray photon. The ratio of the energy of the photon to the kinetic energy of the electron is (the energy equivalent of electron mass of 0.5 MeV) (a) 1: 50 [WB JEE 2014] (d) 50 : 1 (b) 1 : 20 (c) 20: 1...(Solve this

asked Mar 28, 2020 by balaji.thirumalai

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(chatquestion)...emitter amplifier A light glass tube with a sealed lower end and 16. 7.OmA, collector cross section area S = 2.5 cm contains a column of mercury of mass m = 2 kg. Between the mercury and the lower end is some trapped ideal gas. The glass tube is sliding down a slope with an inclining angle a = 30°, The kinetic friction coefficient between the tube and V3 The pressure of the 6. the slope is as uniform 2a and density trapped gas in terms of the standard nersed in water atmosphere pressure will be: given (P-10 ) 5°, while one of atm=105 m2 urface. Find the with respect to Gas (1) 1.7 Patm (2) 1.2 Patm (3) 1.9 Patm (4) 2.3 Patm 7....(Anyone question 16..??)

asked Mar 28, 2020 by balaji.thirumalai

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(chatquestion)...[e] x + y-2 a = 0 The equation to the parabola whose focus is (1. 1) andwhose vertex is (2,1) is: [a] 4x 2+ 4xy + y 2+8x + 46y +71 = 0 [b] 4x 2- 4xy + y 2+ 8x + 46y-71 = 0 [c] 4x 2- 4xy+ y 2-8x + 46y- 71 0 [d] 4x 2+ 4xy + y 2-8x - 4y + 71 = 0 [e] 4x 2-4xy + y 2-8x + 46y-12 = 0 - x [ɔ] %3D The lie...(Please help me with this)

asked Mar 28, 2020 by balaji.thirumalai

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(chatquestion)...78, A step down transformer is used at 220 V to provide a current of 0-5 A to a 15 watt bulb. If the secondary has 20 turns, find the number of turns in the primary coil and the current that flows in the primary coil. [Ans. 147, 0-068 A]

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...OH :NEN; IH Subscribe

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...The amount of work done in assembling a system of maximum number of charges each of magnitude q so that each charge is equidistant from the other is equal to (A) 2πε,τ Зд (B) 4πε, Зд (C) 2πε,r (D) none of these.

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...A point charge Q is located at the centre of a hollow spherical conductor having inner radius as R, and outer radius R2. The conductor being uncharged initially. The potential at the inner surface will be (A) KQ (B) KQ R. R. (C) KQ R. (D) none of these.

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...Н.С VI NH,-NH/A product is 0: КОНСН— Н.С ОН ОН Н.С (1) ENH, NH, (2) CH,-CH,-CH,, N, н.С (3) CH,-CH,-CH,, NH, (4) H,C-CHCH, N, ОН

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...Two particles of mass M and 2 M are at a distance D apart. Under their mutual force they start moving towards each other, The acceleration of their centre of mass when they are D/2 apart is: (A) 2 GM/D? (C) 8 GM/D? (B) 4 GM/D2 (D) Zero

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...Lower surface of a plank is rough and lying at rest on a rough horizontal surface. Upper surface of the plank is smooth and has a smooth hemisphere placed over it through a light string as shown in the figure. After the string is burnt, trajectory of C.M. of the sphere 40. is (A) a circle (C) a straight line (B) a ellipse (D) a parabola Plank A system consists three paticles cach

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...sin(1+x)- sin(1-x) lim X->0

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...-1 3 sinx lim X0 4 e^ x→0 4(e* -1

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...77. Arrange following compounds in reactivity order towards nucleophilic addition reaction CH С.Н CH, CH, C=N-CH, Н- C=0bog C=0 Н (I) H- (II) (III) (1) I > II > II (3) II > III > I (2) III > II > I (4) I > III > I .COOH NH,OH 78. Н° product (major] Product will be - N-OH (1) (2) "СООН NH, N- (4) NH (3) COOH...(These 2)

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...If 0 e(-1,2n) then the interval in which cos0 > 0 is (1) (-7, 7) (2) (0,2) Зп 2n TC TO (3) (7, 27) (4) . 2 2

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...TFe(H,O),NO]-2 50. Which of the following homoleptic complex has square planar geometry :- (1) [Ag(S,O), (2) [Co(EDTA)]-2 (3) [Pt(trien)]-2 (4) [Ni(H,O),]-2 51

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...106/ The ground state energy in J, of hydrogen atom is -X. The minimum energy in J, required to promote an electron from n3D1 to n=2 in He* is (TSM-2015) 4X 3X 1) 3X 2) 3 3) 4 4)

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...n2 102, The energy required to excite an electron of H-atom from 1st orbit to 2nd orbit is 3. th of its ionization energy 1) 4 2) nd of its ionization energy 3) -th of its ionization energy 4 4) th of its ionization energy 9. 2013/10

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...inmbr A vessel is filled completely with 500gm of water and 1000gm of mercury. When 21200 cal of heat is given to it, water of mass 3.52gm overflows. Calculate the coefficient of volume expansion of mercury. The expansion of the vessel may be neglected. Coefficient of volume expansion of water = 1.5 x 104 /°C, density of 9. mercury = 13.6 g/cc, density of water = 1g/cc and specific heat of mercury = 0.03 cal/g/°C. *****:

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...13. If log,x = log,2 and log10xy = log 105. log 1020 – log105-log1020, where xe Q and ye Q. then the value 1-x of - is х

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...4. A stone is dropped from the top of a tower and one second later, a second stone is thrown vertically downward with a velocity 20 ms. The second stone will overtake the first after travelling a distance of (g = 10 ms 2) (a) 13 m (c) 11.25 m (b) 15 m (d) 19.5 m Ound and a student gazing out of the window

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...SECTION (B) : RELATION BETWEEN ROOTS AND COFFICIENTS If a, B are the roots of x +ax + 1 = 0 and y, 8 are roots of x? + bx + 1 = 0, find the value of (8 - a)(8- B)(Y - a)(y - B). (A) (a + b)? B-1. (B) (a – b)? (C) (a² + b³) (D) (a- b)

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...(A) 2 (B) 3 (D) 5 -2x+ А9. и(2+ 6) , then x is equal to : (C) 2 +(2-3)-2-1 (A) 0 (B) 1 (D) both (A) and (C)

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...12 A spring-block system is resting on a frictionless floor as shown in the figure. The spring constant is 2.0 Nm-1 and the mass of the block is 2.0 kg. Ignore the mass of the spring. Initially the spring is in an unstretched condition. Another block of mass 1.0 kg moving with a speed of 2.0 ms- collides elastically with the first block. The collision is such that the 2.0 kg block does not hit the wall. The distance, in metres, between the two blocks when the spring returns to its unstretched position for the first time after the collision (JEE Adv. 2018) 2. is -1 2 ms 1 kg 2 kg

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...puu Or the pendulum? Will an increase of temperature cause the clock to gain or lose? (orass (b) A steel ring of 3.00 inches inside diameter at 20°C is to be heated and slipped over a brass shift measuring 3.003 inches in diameter at 20°C. To what temperature should ring be heated? A pendulum clock loses 12sec a day if the temperature is 40°C and goes fast by 4 sec. a day if the = 2 x 10-5/°C) tomporotu...(3rd)

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...10. The solution set of these equation 2M -/2y-1-1-2-1+1 (1) {-1} [1,0) (2) {-1 u(1,00) (3) {0}U[1,0) (4) none of these

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...In the given string-pulley arrangement, all the pulleys and strings are massless and smooth. The acceleration of block will be

asked Mar 27, 2020 by balaji.thirumalai

1 answer

(chatquestion)...Current I as shown in the circuit will be 6Ω ww 62. 6Ω www 3Ω 10 V 1. 10 A 20 2. 3 3. 을 A 4. 응 A

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...A glass flask whose volume is exactly 1000cm3 at 0°C is filled level full of mercury at this temperature. When the flask and mercury are heated to 100°C, 15.2cm3 of mercury overflow. The coefficient of cubical expansion for Hg is 1.82 x 10-2/°C. Compute the coefficient of linear expansion of glass. 6.

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...The volume strength of 3% solution (w/v) of H,O, is (1) 8.99 (2) 7.33 (3) 9.88 (4) 3.77

asked Mar 27, 2020 by balaji.thirumalai

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(chatquestion)...Which of the following compound will exhibit geometrical isomerism? (1) CH, = CH – CH = CH, (2) CH,= CH-CH=CH-CH, (3) CH,= CH-CH,-CH=CH, (4) CH,= CH-C=C- CH=CH, %3D %3D %3D %3D

asked Mar 26, 2020 by balaji.thirumalai

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(chatquestion)...53. A series LCR circuit with L 0-12 H, C = 0-4 pF and R = 23 Q is connected to a 230 V variable frequency supply. Calculate the source frequency for which current amplitude is maximum. Also calculate the maximum value of current. [Ans. 7.3 x 10 Hz ; 14-14 A]

asked Mar 26, 2020 by balaji.thirumalai

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(chatquestion)...46, A virtual current of 4 A flows in a coil when it is connected in a circuit having alternating current of frequency 50 Hz. Power consumed in the coil is 240W. a Celculate the inductance of the coil ù the vintual ptential difrmce oeosst is l0oV ST

asked Mar 26, 2020 by balaji.thirumalai

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(chatquestion)...ле he 44.) A current of 1.1 A flows through a coil when connected to 110 V D.C. When 110 V A.C. of 50 Hz is applied to the same coil, only 0-5 A current nflows. Calculate (i) resistance, (ii) impedance and (iii) inductance of the coil. AJ or ng of (C.B.S.E.) [Ans. 100 2, 220 N, 0-62 H]

asked Mar 26, 2020 by balaji.thirumalai

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(chatquestion)...or 33. Find the value of maximum current passing through an V] inductance 5 henry connected to 100 volt, 21 c/s supply. $00 (P.S.E.B. 2000) [Ans. 0-21 A]

asked Mar 26, 2020 by balaji.thirumalai

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(chatquestion)...Solution set of x satisfying is |x|+ (1) {0} (1 0) (2) (1, 0) (3) (-1, ∞) (4) (-1,1)

asked Mar 26, 2020 by balaji.thirumalai

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(chatquestion)...2.If sin (sin8)– tan (tan10)+ cos- (cos12)+cot (cot 6) is of the form az +b then a-b=. ..... (key 33)

asked Mar 26, 2020 by balaji.thirumalai

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(chatquestion)...1/7 1) 12 x 1U 3) 12 x 107 4) 12 17. 17 to 20 Conceptual 13)3 14)1 15)I 1731 18)2 19)4 20)3 Light of wavelength 4000 a metal surface of work INTS & SOLUTIONS EXERCISE-II Given h=6.62 x 10-34 Js, the maximum KE of PHOTO ELECTRIC EFFECT A photometal is illuminated by lights. wavelengths and respectively. T maximum kinetic energies of electro 1. emitted and the corresp are respectively potential 1) 0. 6 eV, 0.6 V 3) 3.1 eV, 3.1 V The K.E of the electror 2) 2. emitted in the two cases are E, and E 4) 0- respectively. The work function of met is. 6. incident wavelength is a K.E of the electron to wavelength must be Ed-Ed 1) EA-E 2) E +E 3)スーム 4) - 2. Light of wavelength strikes sensitive surface and electrons with kinetic energy E. is to be 1D2え 2) o-a)

asked Mar 26, 2020 by balaji.thirumalai

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(chatquestion)...a ty sf uz log U= X+y P-TrXdutYou =3.

asked Mar 26, 2020 by balaji.thirumalai

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(chatquestion)...Two Carnot engine are connected in series. Temperature of source of first engine is 450 K and temperature of sink of second engine is 200 K. If efficiency of both the engine connected in series is same, then total efficiency of engine, is 금. n is

asked Mar 26, 2020 by balaji.thirumalai

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(chatquestion)...or a given charged conductor of potential V volts is.. Three point charges q, -2q and -2q are placed at the vertices of an equilateral triangle of sidea Find done by external forces to increase their separation to 2a ? DOW\ONEWH bowe

asked Mar 26, 2020 by balaji.thirumalai

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(chatquestion)...8. Which is incorrect curve for Boyle's law? log P 135 log V PV 1/V2...(Please explain this question)

asked Mar 25, 2020 by balaji.thirumalai

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(chatquestion)...y+2 _z-1 and 9. The plane containing the line %3D %3D -1 th also containing its projection on the plane 2x + 3y – z = 5, contains which one of the following points? (a) (0, -2, 2) (c) (2, 0, –2) (b) (-2, 2, 2) (d) (2, 2, 0) (January 2019)

asked Mar 25, 2020 by balaji.thirumalai

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(chatquestion)...Negative Marks : -1 In all other cases. 22. In the f V structu Paragraph X In an experiment, to determine charge to mass ratio of electron using a cylindrical diode, we use following equations L=0.120 ± 0.001 m, r = (3.4± 0.1) x 10 m. I = 1.92 ± 0.02 A and V = 20+1 V. 15. Error occurred in magnitude of magnetic field 8V is (i) %3D p²B² (a) 1% (b) 2% (c) 3% 16. Error in value of e/m of electron is т (d) 4% V = potential difference across diode of radius r %3D (a) 2% (b) 4% (c) 6% (d) 8% Paragraph A A thick spherical shell of charge Q and uniform volumetric charge density p has inner and outer radii 7 and r2, respectively. [Take, potential at infinity is zero, also r, =r and r, = 3r]. 17. Potential at a point distant 2r from centre is (a) 15 pr2/eo (c) 35 pr2 /eo B= magnitude of critical magnetic field, when electron pass undeviated. HonI (1+ D² / L²yU2 (ii) B= n = number of turns per metre length of solenoid, (b) 25 pr2 / eo (d) 45 pr2 /e, C) I = current in solenoid, 18. Potential at a point inside the shell at distance 0.5 r from centre is D= diameter of solenoid and L = length of solenoid. 23. V %3D (a) pr2 /Eo (c) 3 pr2 /eo (b) 2pr2 / Eo Experimental observations are (d) 4 pr2 / eo n = 3920 turns in 1 m, D= 0.035± 0.001 m,...(Pls solve question 15 and 16)

asked Mar 25, 2020 by balaji.thirumalai

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(chatquestion)...13. Which of the following potential energy curves can possible describe the elastic collision between two billiard balls (r is distance between centre of balls and Ris radius of balls). V(r)↑ V(r)1 (1) (2) fon 2 R 2 R V(り介 V(r) (3) (4) 2 R 2 Rr

asked Mar 25, 2020 by balaji.thirumalai

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(chatquestion)...In which of the following cases, would the weight of a body as recorded by a physical beam balance be greater than the true weight of the body? (1) In an elevator accelerating upwards (2) In an elevator accelerating downwards (3) In an elevator moving up with constant speed (4) None of the above

asked Mar 25, 2020 by balaji.thirumalai

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(chatquestion)...Statement I There is a natural asymmetry between converting work to heat and converting heat to work. Statement II No process is possible in which the sole result is the absorption of heat from a reservoir and its complete conversion into work. (2008, 3M)

asked Mar 25, 2020 by balaji.thirumalai

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(chatquestion)...(CH),C-OK CH;-CH-CH,-CH, A (Major), Br the compound 'A' is 1. СH — СH -СH—СНз 2. CH3 – CH = CH – CH3 CH, 3. CH, = C-CH3 4. No Reaction...(The answer is 1. Can you explain what reaction this is?)

asked Mar 25, 2020 by balaji.thirumalai

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(chatquestion)...26. A small block of mass m is placed inside a 1.0 m/s smooth hollow sphere of radius R at lowest 3 kg position. Initially system was at rest as shown in the figure. Now the sphere is given a constant (1) 30 cm horizontal acceleration g by an external agent. (3) 10 cm The maximum angular displacement of block with 30. Consider the vertical, w.r.t. sphere is (a) Linear mo (b) Kinetic en Choose the c →g (1) (a) implies (2) (a) does imply (a) (3) (a) implies (1) 60° (2) 30° (4) (b) implies (3) 45° (4) 90° 31. A particle is c 27 A rigid body of mass 4 ka is under the influence

asked Mar 25, 2020 by balaji.thirumalai

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(chatquestion)...12

asked Mar 25, 2020 by balaji.thirumalai

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(chatquestion)...y3= simm %3D Cosn

asked Mar 25, 2020 by balaji.thirumalai

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