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(chatquestion)...[8. Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis? (a) Less than 1% Jo 2-10% (d) 50% (c) 30%...(Iska answer agar option hota to 1-5% nhi hota kya? Kab 1-5% hota hai answer or kab 2-10% hota answer?)

asked Apr 30, 2020 by balaji.thirumalai

1 answer

(chatquestion)...If sin x+ cos x-1, then general value of x is: (a) nn t (b) 2nn + 4 4 (c) 2nn t (d) nn-

asked Apr 30, 2020 by balaji.thirumalai

1 answer

(chatquestion)...If 3 cosx - sinx =1, then general value of x is: (a) 2nx t (b) 2nn t (c) 2na +- (d) nn + (-1)": 비3

asked Apr 30, 2020 by balaji.thirumalai

0 answers

(chatquestion)...WHAT IS 4

asked Apr 29, 2020 by balaji.thirumalai

1 answer

(chatquestion)...If tan 20 tane = 1, then general value of 0 is: (a) (b) (n + 2) n+ (c) (n+ (d) (n + 2) KIM

asked Apr 29, 2020 by balaji.thirumalai

0 answers

(chatquestion)...1.05. AM=-ve (3) 1.19 V 26.912 V (1) (4) 2.05 V A solid dissolves in water exothermically, if its saturated solution at 20°C is cooled to 0°C than:- (1) Some solid separates out 62. (3) 62. एक पर (2) Some ice separates out (3) Both the solid and ice separate (1 28oc (4) Neither the solid nor the ice separates out 63. Which of the following compounds is most reactive | 63. towards nucleophilic acyl substitution :- Slae)...(Qno.62)

asked Apr 29, 2020 by balaji.thirumalai

0 answers

(chatquestion)...12. A rope passes over a pulley has a ladder with a man of mass m on one end while another mass M on its other end as shown in the figure. M Initially system is at rest. The man climbs up with velocity Vo relative to ladder. If all strings and pulleys are ideal then the velocity of centre of mass of this system is mV, (1) 2M MV (2) M+m mV. (3) М+ т MV, (4) 2(M +m)

asked Apr 28, 2020 by balaji.thirumalai

0 answers

(chatquestion)...The circumfoence e of base cisent aylindey Ahe hight of the eylinder is of 6 Acm squal Hoiw mary Diameter litre base find it cam hold to the watey to

asked Apr 28, 2020 by balaji.thirumalai

1 answer

(chatquestion)...Soumyaa Date Page A Radius There find the gurfase cerbe 6/30m wooden spheue of Asmea of the lasugeat the sphese. passible out from

asked Apr 28, 2020 by balaji.thirumalai

1 answer

(chatquestion)...1) The probability that Mr. Bala will be alive in 25 years time s 0.6 and the probability that Mr. Audu will be alive in 25 years is 0.9. What is the probability that neither will be alive in 25 years? 2) The probably that a married man watches a certain television show is 0.4 and the probability that a married woman watches the show is 0.5. The probability that a man watches the show given that his wife does is 0.7. Calculate; (a) (b) The probability that a couple watches the show The probability that a wife watches the show given that her husband does The probability that at least one person of a married couple will watch the show. (c) 3) What is the probability of getting a total of 7 or 11 when a pair of dice is tossed.

asked Apr 28, 2020 by balaji.thirumalai

1 answer

(chatquestion)...A plane polarized light (lambda = 589.3 nm) is incident on the quartz plate cut with optic axis parallel to the face. If the ratio of transmitted intensities of E-ray and O-ray is 3:1 , find the angle made by the light vibration with the optic axis.

asked Apr 27, 2020 by balaji.thirumalai

0 answers

(chatquestion)...From 1990 to 2012, Cambodia showed an increase of life expectancy by nine years. A. True B. False C. Not stated...(Help me

asked Apr 26, 2020 by balaji.thirumalai

0 answers

(chatquestion)...WHO's annual statistics report shows that low-income countries have made the greatest progress, with an average increase in life expectancy by nine years from 1990 to 2012. The top six countries where life expectancy increased the most 2 were Liberia which saw a 20-year increase (from 42 years in 1990 to 62 years in 2012) followed by Ethiopia (from 45 to 64 years), Maldives (58 to 77 years), 10 Cambodia (54 to 72 years), Timor-Leste (50 to 66 years) and Rwanda (48 to 65 years).

asked Apr 26, 2020 by balaji.thirumalai

0 answers

(chatquestion)...The degree of dissociation of Ca(NO3)2 in a dilute aqueous solution containing 14g of the salt per 200g of water 100° C is 70 percent. If the vapour pressure of water at 100°C is 760 cm. Calculate the vapour pressure of the solution (a) 746.3 mm of Hg (b) 757.5 mm of Hg (c) 740.9 mm of Hg (d) 750 mm of Hg...(Plz do solve it)

asked Apr 26, 2020 by balaji.thirumalai

1 answer

(chatquestion)...8:31 PM ...0.1KB/s G M 38 4 Vo LTE Saral Study Easly atoul oonplicates hings fQ are at the corners of t... BLAZE DOWNLOAD NOW REVOLUTIONS Question 12 A cubic solid is made of two elements P and Q. Atoms of Q are at the corners of the cube and P at the body-centre. What is the formula of the compound? What are the coordination numbers of P and Q? Answer It is given that the atoms of Q are present at the corners of the cube. Therefore, number of atoms of Q in one unit cell = 8 x 1/8 = 1 It is also given that the atoms of P are present at the body-centre. Therefore, number of atoms of P in one unit cell = 1 %3D This means that the ratio of the number of P atoms to the number of Q atoms, P:Q = 1:1 Hence, the formula of the compound is PQ. The coordination number of both P and Q is 8. Previous Question Next Question...(My doubt is why the coordination no. Of P is 8)

asked Apr 26, 2020 by balaji.thirumalai

0 answers

(chatquestion)...Uui U AChlever Course/Phase-MLA,MLD MLE MAZA MAZ AN Following data was obtained for the first order decomposition of SO,Cl,(g) at constant volume: + Cl 71. 75. Which of the following metet's fe (1) Artificial silk is derived from SO,Cl) → SO. 2(g) 2(g) 2(g) (2) Nylon-66 is an example of elae (3) The repeating unit in natul ner S No. Time(s) | Total pressure (atm) (4) Both starch and cellukose are polymerd 76. The activation energy for the macios 0.5 2H1H 100 0.6 0.770.8. KJ is 200- at 600 K. Calculate the fractio df mol Calculate the rate constant: molecules of reactant having energy equal (2) 8.30 x 104 greater than activation cnergy (D6 (1) 4.02 x 10-3 (4) 5.06 x 10-3 (1) e (3) 2.06 × 10-3

asked Apr 26, 2020 by balaji.thirumalai

0 answers

(chatquestion)...25. The rate of chemical reaction between gases is *independent of pressure. The order of the reaction is a. 0 b, 1 c. 2 d. 3 26. Information about the order of reaction is obtained from a. reaction rate b. moleculatrity 1f life neriod...(Can anyone explain these why 3 is answer)

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...A tank circuit consisting of a capacitor of 100 µF and an inductor of inductance 10-4 H. Find the frequency of the wave generated by the tank circuit. [Ans. 1592 Hz]

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...[Ans. 2 x 10 ] 10. Acarrier wave of frequency 1500 kHz is produced by a tank circuit consisting of a capacitor of 1 pF and an inductor of inductance L. Find the value of L. [Ans. 0-011 HJ

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...[Ans. 6.75 V] A carrier wave of frequency 1.5 MHz is used to transmit a message signal of 20 kHz. Find the side band frequencies in the AM wave. 7. [Ans. 1520 kHz, 1480 kHz]

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...The peak value of carrier wave is 9 V. This carrier wave is used to transmit message signal. If the modulation is 75%, find the peak voltage of the message signal. [Ans. 6-75 V] nsmit

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...A transmitting antenna can cover a distance of 50 km on the earth to transmit the signal. Find the height of the antenna. Given, radius of the earth = 6400 km. [Ans. 195 m]

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...- Two signals A and B are used as inputs of an AND gate. Draw its output wave form. Give the logic symbol of AND gate. (C.B.S.E. 2005 S) 7 8 3

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...(H. Two signals A and B are used as inputs of a NAND gate. Draw its output wave form. Give the logic symbol of NAND gate (C.B.S.E. 2005 S) 3 4 7. 8. A B

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...19. For a transistor having Bas 80 feeds 6000 2 load with VCC of 13 V. If knee voltage is 1V and charge in VBE is 1V find maximum input signal for a change of 2.5 mA in collector current.

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...In a full wave rectifier calculate D.C. voltage when r.m.s. value of applied a.c. is 20 V. [Ans. 18 V]

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...A transistor with current gain 11-5 is operated in a 8. common-emitter configuration. Calculate the maximum alternating current gain. [Ans. 19]

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...How much mass will be converted into energy to produce 900 MW of electricity for half an hour ? (P.S.E.B. 2000) [Ans. 18 mg]

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...Calculate the number of fission of 92U235 taking place in 1 hour in a nuclear reactor which develops a power of 108 kW. The energy released per fission is 200 MeV. [Ans. 1.125 x 1025]

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...40 Two radioactive nuclei X and Y initially contain equal number of atoms. The half, life is 1 hr and 2 hr respectively. 5 Calculate the ratio of their rates of disintegration after 2 hr. / (C.B.S.E. 2005)[Ans. 1]

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...TAIS. Z1 0uays , daysj 30 Calculate the half life of radium. 1g of radium is reduced by 2 mg in 5 years by a-decay. [Ans. 1672 years]

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...le 4 The mass of Li' nucleus is 0-042 a.m.u. less than the sum of masses of its nucleons. Calculate the binding energy [Ans. 5-586 MeV] per nucleon.

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...show that atomic mass unit is equivalent to 931 MeV

asked Apr 25, 2020 by balaji.thirumalai

1 answer

(chatquestion)...in the transition, is 4875 mm, find the The electron in a hydrogen atom, initially in a state of quantum number n, makes a transition to a state whose excitation energy with respect to the ground state is 102 eV. If the wavelength, associated with the photon emitted (i) energy in eV and (ii) value of the quantum number n, of the electron its initial state. (C.B.S.E. Sample 2012) [Ans. - 0-85 eV, 4]

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...2 The spectrum of a star in the visible and the ultraviolet region was observed and the wavelength of some of the lines that could be identified were found to be 824 A, 970 Å, 1120 Å, 2504 Å, 5173 Ả, 6100 Å. Which of these lines cannot belong to hydrogen atom spectrum ? (Given Rydberg constant R = 1.03 x 10' m and 1/R = 960 A. Support your answer with suitable calculations. %3D [Ans. All except 970 Å] (C.B.S.E. Sample 2010) and an

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...32. fa Using de Broglie's hyopothesis, explain with the help of a suitable diagram, Bohr's second Aestulate of quantizetion of energy revels in "bongedrigon hydu &hom.

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...Find the first excitation potential of He+ ion. [Ans. 40-8 VJ Calculate the energy of nhoto

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...O Calculate value of Rydberg's constant for hydrogen by putting the value of the fundamental constants in its expression. [Ans. 1-09678 x 107 m] the states

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...Ultraviolet light of wavelength 2271 À from a 100 W mercury source radiates a photo cell made of molybdenum metal. If the stopping potential is 1-3 V, estimate the

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...wavCICnguT TAIS. Calculate the number of photons in 3.13 J of radiation energy of wavelength 6000 Å. (P.S.E.B.) [Ans. 1019 photons]

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...C Find the sum of n terms of the series 3+ 8+22 + 72+266 + 1036+ ..... ...

asked Apr 25, 2020 by balaji.thirumalai

1 answer

(chatquestion)...JA1 Find sum of n terms (S,) and sum upto infinity of the 1.3.5 +. 2.4 2.4.6 2.4.6.8 1.3 series

asked Apr 25, 2020 by balaji.thirumalai

1 answer

(chatquestion)...Find the sum to 50 terms of 1+ (2)(3) + 4 + (5)(6) +7 + (8)(9) + ..

asked Apr 25, 2020 by balaji.thirumalai

1 answer

(chatquestion)...(V) If x, x + 1|, |x - 1| are the first three terms of an A.P. its sum upto 20 terms is (1) 90 or 175 (2) 180 or 350 (3) 360 or 700 (4) 720 or 1400

asked Apr 25, 2020 by balaji.thirumalai

1 answer

(chatquestion)...Let a,, a2, a3, .. be an A.P. Prove that 2m n-1 (a?-am) %3D 2m-1 n=1

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...Prove that there exists only one value of x which satisfy both log25 x2 + (log, x)<2 and e*-5 +x 26

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...For what integral values of a , the equation x? - x(1-a)-(a+2) = 0 has integral roots. Find the roots.

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...Solve the inequation 24-2x- x log >1 25-x? 14 16

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...Show that the equation x (x + 1) (x + h) (x + 1 + h) = h2 has four real roots if Ih| > V5 +2 or h| < V5 -2

asked Apr 25, 2020 by balaji.thirumalai

0 answers

(chatquestion)...Find all real values of a for which the equation xA + (a - 1) x³ + x2 + (a - 1) x + 1 = 0 possesses at least two distinct negative roots.

asked Apr 25, 2020 by balaji.thirumalai

0 answers

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