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Questions asked by balaji.thirumalai
Questions
4474
questions
1
answer selected
(chatquestion)...sin 2x+h) 2 sin 2 - lim- COS x 2h cos(x+h) 2x+h sin - lim- h40 cos(x+h) sin - lim coS x 2 sin x COS X COS X = sec x tan x...(What did happen here ?)
other
telegram-57206
asked
Feb 16, 2020
0
answers
(chatquestion)...R. r/2 T/2 Ar r/2 r/2 R. B....(Find equivalent resistance....if anyone knows..)
other
telegram-57199
asked
Feb 16, 2020
1
answer
(chatquestion)...If ax +2hxy+ by² = c ,then show that d²y_c(h² - ab) (hx+by) dx2
other
telegram-57194
asked
Feb 16, 2020
0
answers
(chatquestion)...ABC is a right angle triangle in which AB Q.68 = 3 cm, BC = 4 cm and ZABC = The %3D %3D three charges +15, +12 and – 20 e.s.u. are placed respectively on A, B and C. The force acting on B is (1) 125 dynes (3) 25 dynes (2) 35 dynes (4) Zero
other
telegram-57192
asked
Feb 16, 2020
0
answers
(chatquestion)...6. The operation manager of a plant that manufactures tires want to compare the actual inner diameter of two grades tires, each of which is expected to be 575 millimeters. A sample of five tires of each grade has following result Grade X 568 570 575 578 584 Grade Y 573 574 575 577 578 a. Find mean and standard deviation of each grade. b. Which grade of tires is providing better quality?
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telegram-57188
asked
Feb 16, 2020
0
answers
(chatquestion)...What is the action of conc. NaOH on methanal? What is the action of dilute alkali on ehanal? What is action of Br2 on ethanoic acid?
other
telegram-57183
asked
Feb 16, 2020
1
answer
(chatquestion)...f (x+h)- f(x) ian We have f'(x) = lim- 1 (x+h) x = lim %3D [(*+*), *J"...(Pls explain the second step)
other
telegram-57180
asked
Feb 16, 2020
0
answers
(chatquestion)...f (x)-2 If the function f(x) satisfies lim -= TT, evaluate lim f (x). x² -1 x-1 x-1
other
telegram-57174
asked
Feb 16, 2020
0
answers
(chatquestion)...deóxythymidine. When a phosphate group nucleoside through phosphoester linkage, a corresponding nucleo (or deoxynucleotide depending upon the type of sugar present) is form Two nucleotides are linked through 3-5 nhosnhodiester linkage to for a dinucleotide. More nucleotides ca ut Joneu in sucha manner to for a polynucleotide chain. A polymer thus formed has at one end a f sphate...(What does 3'-5' indicate)
other
telegram-57171
asked
Feb 15, 2020
0
answers
(chatquestion)...If tan x + tan y = ; xy < 1, then write 4 the value of x + y + xy. All India 2014
other
telegram-57165
asked
Feb 15, 2020
1
answer
(chatquestion)...x sin-1 dx. Evaluate | V1-x²
other
telegram-57162
asked
Feb 15, 2020
1
answer
(chatquestion)...A solution of Ni(NO3), is electrolysed between platinum electrodes using a current of 5.0 A for 20 min. What mass of nickel will be deposited at the cathode? (Given : Atomic mass of Ni = 58.7 g mol 1F= 96500 Cmol-1) %3D Foreign 2014 %3D
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telegram-57156
asked
Feb 15, 2020
1
answer
(chatquestion)...10. In Young's double slit experiment fringe width for the interferences of light of wavelength 6000 Aº is found to be 0-8 mm. If the wavelength of light 7500 A° is used and the distance between slits is doubled then determine the fringe width.
other
telegram-57154
asked
Feb 15, 2020
1
answer
(chatquestion)...A current of 1.50 A was passed through an electrolytic cell containing AgNO3 solution with inert electrodes. The weight of silver deposited was 1.50 g. How long did the current flow? (Molar mass of Ag = 108 g mol, 1F = 96500 C mol-). %3D %3D
other
telegram-57151
asked
Feb 15, 2020
1
answer
(chatquestion)...Deduce an expression for the frequency of revolution of a charged particle in a magnetic field and show that it is independent of velocity or energy of the particle.
other
telegram-57146
asked
Feb 15, 2020
1
answer
(chatquestion)...In a potentiometer arrangement for determining the emf of a cell, the balance point of the cell in open circuit is 350 cm. When a resistance of 9 Q is used in the external circuit of the cell, the balance point shifts to 300 cm. Determine the internal resistance of the cell. 2018
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telegram-57143
asked
Feb 15, 2020
1
answer
(chatquestion)...3. %3D 3D The V-I characteristic of a silicon diode is as shown in the figure. Calculate the resistance of the diode at (i) I = 15 mA and (ii) V = -10V (1 mA) 30 Silicon 20 15 10 -10 V 01 0.51 0.7 0.8 V 1 µA
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telegram-57140
asked
Feb 15, 2020
1
answer
(chatquestion)...69. Consider the following three statements and select the Y correct option stating which ones are true (T) and which ones are false (F). O Hybridisation is crossing of two or more types of 1. plants for bringing their traits together in progeny. (i) Semi-dwarf rice varieties were derived from IR-8 and Taichung Native -1. T (ii) Hybrid breeding have led to the development of several high yielding varieties resistant to water stress.
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telegram-57136
asked
Feb 15, 2020
1
answer
(chatquestion)...The number of atoms of radioactive substance of half-life T is Natt = 0. The time necessary to decay from No/2 atoms to No/10 atoms will be In 5 (d) T In 2 (a) T In 5 (c) T In
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telegram-57134
asked
Feb 15, 2020
1
answer
(chatquestion)...1 mg gold undergoes decay with 2.7 days half-life period, amount left after 8.1 days is (b) 0.5 mg (d) 0.91 mg (a) 0.125 mg (c) 0.25 mg
other
telegram-57127
asked
Feb 15, 2020
1
answer
(chatquestion)...When four hydrogen nuclei combine to form a helium nucleus estimate the amount of energy in MeV released in this process of fusion (Neglect the masses of electrons and neutrons) Foreign 2011 Given: (i) Mass of H = 1.007825 u (ii) Mass of helium nucleus =4.002603 u, 1 u= 931 MeVIc"
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telegram-57122
asked
Feb 15, 2020
1
answer
(chatquestion)...A radioactive isotope has a half-life of T years. How long will it take the activity to reduce to 3.125% of js original value?
other
telegram-57119
asked
Feb 15, 2020
1
answer
(chatquestion)...The number of nuclei of a given radioactive sample at time t = 0 and t = T are No and Nln, respectively. Obtain an expression for the half-life (T12) of the nucleus %3D in terms ofn and T.
other
telegram-57116
asked
Feb 15, 2020
1
answer
(chatquestion)...The magnetic susceptibility of magnesium at 300K is 1.2×10°. At what temperature will its magnetic susceptibility become 1.44x105? A|l India 2019
other
telegram-57109
asked
Feb 15, 2020
1
answer
(chatquestion)...A bar magnet of magnetic moment 6 J/T is aligned at 60° with a uniform external magnetic field of 0.44 T. Calculate (a the work done in turning the magnet tO align its magnetic moment inormal to the magnetic field, opposite to the magnetic field and bthe torque on the magnet in the final orientation in case (ii). CBSE 2018
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telegram-57104
asked
Feb 15, 2020
1
answer
(chatquestion)...Prove that the magnetic moment of the electron revolving around a nucleus in an orbit of radius r with orbital speed v is equal to evr/2. Hence using Bohr's postulate of quantisation of angular momentum, deduce the expression for the magnetic moment of hydrogen atom in the ground state. All India 2019
other
telegram-57102
asked
Feb 15, 2020
1
answer
(chatquestion)...A small compass needle of magnetic moment M and moment of inertia I is free to oscillate in a magnetic field B. It is slightly disturbed from its equilibrium position and then released. Show that it executes simple harmonic motion. Hence, write the expression for its time period. 00110
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telegram-57100
asked
Feb 15, 2020
1
answer
(chatquestion)...57. What is displacement currènt? Why was this concept introduced? Explain? PTICS
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telegram-57096
asked
Feb 15, 2020
1
answer
(chatquestion)...queStTon oT 2020 Exam, 36. Discuss the transmission.of radio waves through earth's atmosphere earth's atmosphere using amplitude modulated band and Give the relation between height of antenna and radius of earth.
other
telegram-57092
asked
Feb 15, 2020
1
answer
(chatquestion)...35.Describe electromagnetic spectrum, giving their wavelength and frequency range, their properties and uses, briefly.
other
telegram-57090
asked
Feb 15, 2020
1
answer
(chatquestion)...EMW electromagnetic waves? What are the characteristics of e.m. waves? 34. What are
other
telegram-57084
asked
Feb 15, 2020
1
answer
(chatquestion)...21, Due to the earth's magnetic field, charged cosmic ray particles [CBSE AIPMT 1997] (a) can never reach the poles (b) can never reach the equator (c) require less kinetic energy to reach the equator than the poles (d) require greater kinetic energy to reach the equator than the poles
other
telegram-57063
asked
Feb 15, 2020
1
answer
(chatquestion)...reaction. 83 What is a Chain reaction? When is it called chain reaction?
other
telegram-57058
asked
Feb 15, 2020
1
answer
(chatquestion)...2. What are stable and unstable nuclei? What factors contribute towards stability of nuclei?) Discuss the nature of nuclear forces and Discuss nuclear fission
other
telegram-57054
asked
Feb 15, 2020
1
answer
(chatquestion)...What is mass defect? Explain. Explain the terms mass and nuclear binding energy.
other
telegram-57051
asked
Feb 15, 2020
1
answer
(chatquestion)...9. Derive the expression for the number or remaining nuciei after time t. Definre half-life of a radioactive substance.
other
telegram-57046
asked
Feb 15, 2020
1
answer
(chatquestion)...Or, (a) Three point charges 200 µ C,-300 µ C and 400 u C are kept at the vertices A, B and C respectively of an equilateral triangle ABC with each side 0-1 m. Find the electrostatic energy of the system. (b) Write down the relation between electrostatic field intensity and ecetrostatic potential.
other
telegram-57038
asked
Feb 15, 2020
1
answer
(chatquestion)...What do you understand by radioactivity?
other
telegram-57035
asked
Feb 15, 2020
1
answer
(chatquestion)...How are electromagnetic waves produced by accelerating charges? All India 2019 PEGUTVA
other
telegram-57029
asked
Feb 15, 2020
1
answer
(chatquestion)...Sketch a schematic diagram depicting oscillating electric and magnetic fields of an EM wave propagating along positive Z-direction. Foreign 2014
other
telegram-57026
asked
Feb 15, 2020
1
answer
(chatquestion)...1. A girl throws a ball upwards, giving it an initial speed u= 15 m/s. Neglect air resistance, (a) How long does the ball take to return to the girl 's hand? (b) What will be its velocity
other
telegram-57024
asked
Feb 15, 2020
1
answer
(chatquestion)...A capacitor made of two parallel plates, each of area A and separation d is charged by an external DC source. Show that during charging, the displacement current inside the capacitor is the same as the current charging the capacitor. All India 2019
other
telegram-57021
asked
Feb 15, 2020
1
answer
(chatquestion)...6.(2) Two identical large metallic plates with surface charge densities +o and-o are kept apart by a small distance. There is a point P, in between the two plates and another point P, outside the two plates. Find the electric field intensities at P, and P,. 1 () Find the electric field intonai
other
telegram-57012
asked
Feb 15, 2020
0
answers
(chatquestion)...72.0) U) (0, 22 72 u)(77. 0) x'+128 x° +8 lim 2) %3D a) 56% b) 112% o) 12% d) 28% 20/3 3. 3. and touch
other
telegram-57008
asked
Feb 15, 2020
1
answer
(chatquestion)...is 5 x 10-5 mho cm- and at the same temperature molar conductance of the solution at infinite dilution is 390-5 mho cm?mol. Calculate the dissociation constant of acetic acid at that temperature. 1+2
other
telegram-57004
asked
Feb 15, 2020
0
answers
(chatquestion)...(c)OWrite the symbolic notation for standard Hydrogen electrode. (i) At a definite temperature specific conductance of an aqueous solution of 0-001 (M) CH,COOH
other
telegram-57001
asked
Feb 15, 2020
1
answer
(chatquestion)...Or, Identify the following A to J: 2x10=D5 NHO, [B] KCN (i) O. -СНО →[A]- KCN [C] Ethanol Ethanol i) NH,/A → [D] i) P,O, (ii) COOH i) Cr0,Cl, /CS, CH, CНO Dil. NaOH LF] -CH (iii) (O →[E] ti) Н,О СНО CH,N, (Excess) [H] Ag,0, A, H,0 50% NaOH → [G] (v) CH,COCI (iv) CHO N,H, (C) H,SO, [J] HNO, (vi) CH,CONH,
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telegram-56998
asked
Feb 15, 2020
0
answers
(chatquestion)...(c)(i) What is Braddy's Reagent? (ii) One alkene (A) produces acetone after ozonolysis and also given an aldehyde. That aldehyde gives (C) after reaction with bromine which produces hydroxy acid (D) after hydrolysis. Reaction between acetone and HCN forwarded to hydrolysis also produce acid (D). Find out A, B, C and D. (iii) Chemically differentiate between HCHO and HCOOH. 1+2+1
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telegram-56996
asked
Feb 15, 2020
0
answers
(chatquestion)...U 1 :Vo) LTE LTE 11 53% 20:59 You 7 minutes ago Ringtone 40 cm In Figure ABCD, find the area of the shaded region. 8cm 20 cm yoom3 10 cm 10 cm 254 VII CLASS MATHEMATICS...(Screenshot (15 February 2020 20:59))
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telegram-56993
asked
Feb 15, 2020
0
answers
(chatquestion)...013) 9. If 1, o and o are the cube root of unity, then then express x-xy+y as a linear factors. 10. If o is the imaginary cube root of unity, then prove that: (i) 1+o" +@" =0, n=2,4 .2 014) -8
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telegram-56991
asked
Feb 15, 2020
0
answers
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