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Questions asked by balaji.thirumalai
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4474
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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)
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telegram-57408
asked
Feb 17, 2020
1
answer
(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.
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telegram-57406
asked
Feb 17, 2020
0
answers
(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)
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telegram-57404
asked
Feb 17, 2020
1
answer
(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
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telegram-57402
asked
Feb 17, 2020
0
answers
(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
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telegram-57400
asked
Feb 17, 2020
0
answers
(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 ?)
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telegram-57398
asked
Feb 17, 2020
0
answers
(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
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telegram-57391
asked
Feb 17, 2020
1
answer
(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)-
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telegram-57386
asked
Feb 17, 2020
0
answers
(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
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telegram-57379
asked
Feb 17, 2020
0
answers
(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
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telegram-57375
asked
Feb 17, 2020
0
answers
(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
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telegram-57370
asked
Feb 17, 2020
0
answers
(chatquestion)...Problem #5: The vapor pressure of pure water is 23.8 mmHg at 25.0 °C. What is the vapor pressure of 2.50 molal C6H12O6...(Help me)
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telegram-57364
asked
Feb 17, 2020
0
answers
(chatquestion)...4. According to Bohr's theory (assuming of the nucleus), the infinite mass frequency of the second line of the Balmer series is (b) 6.16× 1013 Hz (d) 6.16x 100 Hz (a) 6.16× 1014 Hz (c) 6.16x 1010 Hz
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telegram-57361
asked
Feb 16, 2020
1
answer
(chatquestion)...Write the expression for the de-Broglie wavelength associated with a charged particle having charge q and mass m, when it is accelerated by a potential.
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telegram-57358
asked
Feb 16, 2020
1
answer
(chatquestion)...Why is photoelectric emission not possible at all frequencies? All India 2012C
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telegram-57355
asked
Feb 16, 2020
1
answer
(chatquestion)...In a meter bridge, the null point is found at a distance of 60 cm from A. If a resistance of 5Q is connected in series with S, then null point occurs at 50.0 cm from A. Determine the values of R and S. (G)
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telegram-57352
asked
Feb 16, 2020
1
answer
(chatquestion)...- A circular coil of N turns and radius R carries a current I. It is unwound and rewound to make another coil of radius R/ 2, current I remaining the same. Calculate the ratio of the magnetic moments of the new coil and the original coil. All India 2012
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telegram-57349
asked
Feb 16, 2020
1
answer
(chatquestion)...A compound microscope uses an objective lens of focal length 4 cm and eyepiece lens of focal length 10 cm. An object is placed at 6 cm from the objective lens. Calculate the magnifying power of the compound microscope. Also, calculate the length of the microscope. All India 2011
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telegram-57346
asked
Feb 16, 2020
1
answer
(chatquestion)...The ratio of the widths of two slits in Young's double slit experiment is 4:1. Evaluate the ratio of intensities at maxima and minima in the interference pattern. Delhi 2015
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telegram-57343
asked
Feb 16, 2020
1
answer
(chatquestion)...- In what way is plane polarised light different from an unpolarised light? 2015 C, All India 2012 C
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telegram-57340
asked
Feb 16, 2020
1
answer
(chatquestion)...(i) The mass of a particle moving with velocity 5x 106 m/s has de-Broglie wavelength associated with it to be 0.135 nm. Calculate its mass. (ii) In which region of the electromagnetic spectrum does this wavelength lie? All India 2011C
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telegram-57337
asked
Feb 16, 2020
1
answer
(chatquestion)...(i) Determine the de-Broglie wavelength of a proton whose kinetic energy is equal to the rest mass energy of an electron. Mass of a proton 1836 times that of electron. (ii) In which region of electromagnetic spectrum does this wavelength lie? All India 2011C
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telegram-57334
asked
Feb 16, 2020
1
answer
(chatquestion)...The ratio between the de-Broglie wavelengths associated with protons, accelerated through a potential of 512 V and a-particles, accelerated through a potential of X volt is found to be one. Find the value of X. Delhi 2010C
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telegram-57331
asked
Feb 16, 2020
1
answer
(chatquestion)...The graph shows the variation of stopping potential with frequency of incident radiation for two photosensitive metals A and B. Which one of the two has higher value of work function? Justify your answer. All India 2014 Metal B Metal A Stopping potential (Vo) VO v'O Frequency of incident radiation (v) Фо Фо
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telegram-57328
asked
Feb 16, 2020
1
answer
(chatquestion)...Show the variation of photoelectric current with collector plate potential for different frequencies but same intensity of incident radiation. Foreign 2011, All india 2010
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telegram-57325
asked
Feb 16, 2020
1
answer
(chatquestion)...A photon emitted during the de-excitation of electron from a state n to the first excited state in a hydrogen atom, irradiates a metallic cathode of work function 2eV, in a photocell, with a stopping potential of 0.55 V. Obtain the value of the quantum number of the state n.All India 2019
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telegram-57320
asked
Feb 16, 2020
1
answer
(chatquestion)...An a-particle moving with initial kinetic energy K towards a nucleus of atomic number Z approaches a distance d at which it reverses its direction. Obtain the expression for the distance of closest approach d in terms of the kinetic energy of a-particle K. All India 2016C
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telegram-57317
asked
Feb 16, 2020
1
answer
(chatquestion)...Calculate the de-Broglie wavelength of the electron orbiting in the n = 2 states of hydrogen atom. All India 2016 %3D
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telegram-57314
asked
Feb 16, 2020
1
answer
(chatquestion)...Find the wavelength of the electron orbiting in the first excited state in hydrogen atom. All India 2016
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telegram-57310
asked
Feb 16, 2020
1
answer
(chatquestion)...A hydrogen atom in the ground state is excited by an electron beam of 12.5 eV energy. Find out the maximum number of lines emitted by the atom from its excited state.Al India 2019
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telegram-57308
asked
Feb 16, 2020
1
answer
(chatquestion)...Obtain the expression for the ratio of the de-Broglie wavelengths associated with the electron orbiting in the second and third excited states of hydrogen atom,
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telegram-57305
asked
Feb 16, 2020
1
answer
(chatquestion)...When is H-line of the Balmer series in the emission spectrum of hydrogen atom obtained? Delhi 2013C
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telegram-57302
asked
Feb 16, 2020
1
answer
(chatquestion)...A converging lens has a focal length of 20 cm in air. It is made of a material of refractive index 1.6. It is immersed in a liquid of refractive index 1.3. Calculate its new focal length. All India 2011
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telegram-57280
asked
Feb 16, 2020
1
answer
(chatquestion)...A ray of light incident on the face AB of an isosceles triangular prism makes an angle of incidence i and deviates by angle B as shown in the figure. Show that in the position of minimum deviation ZB = Za. Also find out the condition, when the refracted ray QR suffer total internal reflection. %3D C All India 2019
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telegram-57278
asked
Feb 16, 2020
1
answer
(chatquestion)...The radii of curvature of the faces of a double convex lens are 10cm and 15 cm. If focal length of the lens is 12 cm, find the refractive index of the material of the lens. Delhi 2010
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telegram-57274
asked
Feb 16, 2020
1
answer
(chatquestion)...A beam of light converges at a point P. A concave lens of focal length 16 cm is placed in the path of this beam 12cm from P. Draw a ray diagram and find the location of the point at which the beam would now converge. All India 2011C
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telegram-57272
asked
Feb 16, 2020
1
answer
(chatquestion)...- A ray of light incident on an equilateral glass prism (µ, = V3) moves parallel to the base line of the prism inside it. Find the angle of incidence for this ray. %3D
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telegram-57265
asked
Feb 16, 2020
1
answer
(chatquestion)...When monochromatic light travels from a rarer to a denser medium, explain the following giving reasons. (i) Is the frequency of reflected and refracted light same as the frequency of incident light? (ii) Does the decrease in speed imply a reduction in the energy carried by light wave? Delhi 2013
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telegram-57262
asked
Feb 16, 2020
1
answer
(chatquestion)...4G 10:20 PM VOLTE KB/s E AIATS For One Year Me... Revise laterN 02:46 : 45 English Q 98/180 Each codon is made of three adjacent nitrogen bases and there are 61 codons for various amino acids. How many substitution point mutations are possible for these 61 codons? 183 549 732 61 Clear Response
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telegram-57249
asked
Feb 16, 2020
1
answer
(chatquestion)...A ray of light falls on a transparent sphere with centre C as shown in the figure. The ray emerges from the sphere parallel to the line AB. Find the angle of refraction of A if the refractive index of material of sphere is 3. Air Air 60° dehbor
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telegram-57248
asked
Feb 16, 2020
1
answer
(chatquestion)...An equilateral glass prism has a refractive index 1.6 in air. Calculate the angle of minimum deviation of the prism, when kept in a medium of refractive index 4 5
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telegram-57244
asked
Feb 16, 2020
1
answer
(chatquestion)...A27. Calculate the radius of curvature of an equi-concave lens of refractive index 1.5, when it is kept in a medium of refractive index 1.4, to have a power of – 5 D ? Delhi 2019
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telegram-57242
asked
Feb 16, 2020
1
answer
(chatquestion)...A converging lens axially in contact with a diverging lens; both the lenses being of equal focal lengths. What is the focal length of the combination? All India 2010
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telegram-57238
asked
Feb 16, 2020
1
answer
(chatquestion)...Ionisation energy of element A are :- IE, 540 kJ/mol 47. IE, IE, 430 120 If A react with different elements, which compounds of A is not possible? (4) A,N, (3) A,N (2) A,0 (1) AF
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telegram-4874
asked
Feb 16, 2020
1
answer
(chatquestion)...hydrogen ? होगा - ) 1:4 (2) 4:1 (4) 8:1 (1) 1= (3) 1:8 Arrange the following compounds in decreasing 53. 53. निम्न यौ करें- order of acidity : ОН ОН ОН ОН ОН CH CH-CH, H,C-C-CH, CH, ČH,CH, ČH, CH, (P) (S) (R) (Q) (P) (1) (2) Q>R>P >S (1) P>Q>R> S.
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telegram-57231
asked
Feb 16, 2020
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answers
(chatquestion)...my ne column of a given determinant. corresponding elements of any two rows (or columns) of a determinant roportional (in the same ratio), then its value is zero. For example az b3 =0 (rows R, and R, are proportional) b2 A= b, %3D ka, ka, 102 18 36 4. 1 3 9 Evaluate 6. 3 17...(Explain how R1 and R2 are proportional)
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telegram-57226
asked
Feb 16, 2020
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answers
(chatquestion)...8. Dind eurtents d, andila intue netwepk EgplV...(Plz Give the Solution of this circuit)
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telegram-57219
asked
Feb 16, 2020
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answers
(chatquestion)...95 Which ALLEN part of neuron mitochondria? contain तंत्रिका के more 95. (1) Dendron (2) Axon hillock (1) दुप्र (3) Tigroid body (3) (4) Telodendria 96. Which organelle lack membranes ? 96. किस (2) Centrosome (1) Ribosome
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telegram-4868
asked
Feb 16, 2020
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answers
(chatquestion)...0.04K/s Z 4G VOLTE 5:13 PM 23% Major Test-4 NEET-UG - Major SAVE 6/41 A English A block of mass m is at rest on a rough inclined plane, whose friction coefficient is µ. Net force exerted by surface on block is :- mg 2 mg sin e 3 µmg cos 0 X Your Answer 4 umg sin e Solution Silly Conceptual
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telegram-4866
asked
Feb 16, 2020
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answers
(chatquestion)...If ax +2hxy+ by² = c ,then show that d²y_c(h² - ab) (hx+by) dx2
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telegram-57211
asked
Feb 16, 2020
0
answers
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