Recent questions tagged other

(chatquestion)...25. HA + OH- –→ H,0 + A¯ + q, kJ H* + OH → H,0 + q2 kJ The enthalpy of dissociation of HA is (2) (9, – 92) (1) (q, + q2) (4) –(q, + 92) (3) (92 – 91)

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...Simple Harmonic Motion AICE (IT-JEE) Sample Problem 9.8: Compare the time period of oscillations of the rods of mass m, length I as shown in the figures. In figure I the horizontal rod is welded while in figure II, the horizontal rod is free to rotate about the pin through its centre. Fig. I. Fig. II....(Solution?)

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...48. Which compound does not form in wurtz reaction when methyl chloride and ethyl chloride react with Na metal in presence of dry ether. (2) Butane Pentane Propane (4) Ethane...(Iska answer kaise aaega Koi samjha do please yaar

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...+7+7 Or, (a) How will you determine emf of a cell by the help of a potentiometer? th bo

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...Two rings R, and R, are made from same type of wire have diameters d, and d, respectively. If their moments of inertia are in the ratio 1:8, then ratio of d, to d, is 1:4 (1) (2) 1: 2 (3) 1: 2 1:21/3 (4) 3.17 A letter 'K' is made by joining three identical thin rods, each of length L and mass M. The moment of inertia of this arrangement about the axis shown is ML2 (1) 3 (2) ML2 2 (3) ML2 ML2 (4) 12 3,18 A solid and a hollow sphere, having same mass, 1/4...(Both questions, with explanation)

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...Example 2.65 Find the equivalent capacitance betuween A and B. (i) 2r 4r от Three conducting concentric shells of radii r, 2 r and 4r.

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...14. Evaluate sec x tan2x dx

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...14. Identify A and predict the type of reaction OCH, NaNH, Br OCH3 and substitution reaction (a) NH2 OCH3 NH2 and elimination addition reaction (b) OCH3 Br and cine substitution reaction OCH3 and cine substitution reaction (d) (c)

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...PARAGRAPH FOR QUESTIONS 80 - 81 A rod of length e (< 2R) is kept inside a smooth spherical shell as shown in figure. Mass of the rod is m. 80. Keeping mass to be constant, if length of the rod is increased (but always < 2R) the normal reactions at two ends of the rod: will remain constant (B) (D) (A) will increase will decrease (C) may increase or decrease The normal reaction when l = R is : mg mg (C) mg mg (B) (A) (D) 2/3 4 in v ovis as well as along x-axis. A ball of mass.

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...Arrange the following compounds in order of decreasing rate of hydrolysis for S1 reaction (1) CH,-Br (m) Н,С CH,-Br (I) CH, - CH, CH,-Br CH, CH (IV) CH, CH,-Br (A) II > II > M>I (B) IV> Im > 1I > I (C) II > V> l >I (D)I > n> m > V...(Anyone)

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...5 Marks Questions 50. A device X is connected to an AC source. V =V, sin øt. The variation of voltage, current and power in one cycle is shown in the following graph. (i) Identify the device X. (ii) Which of the curves A, B and C represent the voltage, current and the power consumed in the circuit? Justify the answer. (iii) How does its impedance vary with frequency of the AC source? Show graphically. (1v) Obtain an expression for the current in the circuit and its phase relation with AC voltage. All India 2017

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...EXAMPLE 18 Find the equation of the plane passing through the points (-1, 1, 1) and (1,-1, 1) and ls perpendicular to the plane x + 2y +2z 5 O Solution The equation of a plane passing through the point (-1, 1, 1) is a(x+1) + b(y-1) + c(z-1) = 0 ...(1) [where a, b, c are constants] Now, the plane (1) passes through the point (1, -1, 1) a(1 + 1) + b(-1 - 1) + c(1-1) = 0 2a - 2b = 0 or, a - b+0 c= 0 or, ...(2) Since the plane (1) is perpendicular to the plane x + 2y + 2z = 5 (given), so, normals to the planes (1) and x + 2y + 2z = 5 are are perpendicular to each other. a + 2b + 2c = 0 ..*(3) Hence, from (2) and (3) [by cross-multiplication] we get, 9. -k (+0, say) %3D 3. a = -2k, b =-2k, c= 3k in (1) we get, - 2k(x + 1) - 2k(y-1)+3k(z-1) = 0 - 2x- 2-2y + 2 + 3z -3 = 0 [: k#0] or, 2x + 2y-3z+3 = 0 Therefore, the equation of the required plane is or, 2x + 2y-3z +3 = 0

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...78. Figure shows a heavy block kept on a frictionless surface and being pulled by two ropes of equal mass m. At t = 0, the force on the left rope is withdrawn but the force on the right end continues to act. Let F and F, be the magnitudes of the forces by the right rope and the left rope on the block respectively. Fi = F2= F+ mg for t < 0 Fi < F, F2 < F for t> 0 (B) F = F2 F = F, F2 = F for t> 0 (A) = F for t < 0 %3D (C) (D)...(What does t<0 mean ?)

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...7. Which one of the following compounds will be most readily dehydrated? [2010] ОН (a) CH3 (b) CH; ОН (c) НаС ОН ОН (d) CH3

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...A variable line through the point (6/5, 6/5) cuts the co-ordinate axes at the points A and B. If the point P divides AB internally in the ratio 2: 1, show that the locus of P is 5xy 2(2x + y)-

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...18.O1 TERER 18, Figure (6-E6) shows two blocks in contact sliding down an inclined surface of inclination 30°. The friction coefficient between the block of mass 2-0 kg and the incline is u, and that between the block of mass 4-0 kg

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...and the incline is u.. Calculate the acceleration of the 2-0 kg block if (a) u. = 0-20 and µ, = 0-30, (b) µ = 0•30 and u, = 0-20. Take g = 10 m/s" %3D %3D %3D %D %3D 2 kg 4 kg 30 Figure 6-E6

asked Feb 17, 2020 by balaji.thirumalai

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(chatquestion)...Calculate Karl Pearson's coefficient of skewness from the following data. 10-40 10-30 10-50 10-60 10-70 10-20 10-80 Class 10-90 56 97 124 16 137 146 Frequency 150 Calculate Karl Pearson's coefficient of skewness for the following data. Sae 3(7.ml No. of employee Salary Below 100 Below 200 10 15 30 Below 300 42 Below 400 Below 500 Below 600 Below 700 57 64 68

asked Feb 17, 2020 by balaji.thirumalai

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