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Questions asked by balaji.thirumalai
Questions
4474
questions
1
answer selected
(chatquestion)...45) In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semicircular paths of radius R using a magnetic field B. If V and B are kept constant, the charge on the ion ratio will be proportional to mass of the ion (a) 1/R? (c) R (b) R? (d) 1/R. (2007)...(Plz Solve this ques also)
other
telegram-58147
asked
Feb 24, 2020
0
answers
(chatquestion)...67 A sample of radioactive element has a mass of 10 g at an instant t = 0. The approximate mass of this element in the sample after two mean lives is (a) 1.35 g (c) 3.70 g (b) 2.50 g (d) 6.30 g (2003) l the radius...(Please solve this)
other
telegram-58145
asked
Feb 24, 2020
0
answers
(chatquestion)...How many nodal plane is/are present in o*2p, 79. antibonding molecular orbital :- (Z= internuclear axis) (1) 0 (2) 1 (3) 2 (4) 3...(Plz explain this question)
other
telegram-58143
asked
Feb 24, 2020
0
answers
(chatquestion)...2.45 m/s End 1 has a hemis (1) Zero r. End 2 has sub- (2Y20.0 cm shown in figure. Ju (3) 10.6 cm (4) 40. 0 cm (1) Air from end 1 flow in the volume of the 11. A small ball is left in a viscous liquid form very much height. Correct graph of its velocity with time is : (2) Air from end 1 flow bubble (1) A of the soap (3) No change occurs (2) B (4) Air from end 2 flo 3) C of the soap bubbi time velocity...(11)
other
telegram-5144
asked
Feb 23, 2020
0
answers
(chatquestion)...Or, Resistance of an electric instrument is 200 2 and it can bear a maximum current of 0-1 A. If someone wants to connect it to a D.C. source of 1A current, find the resistance to be connected parallel to it. 2
other
telegram-58135
asked
Feb 23, 2020
0
answers
(chatquestion)...ах 1-2xCosU + У (a+bx)-e*3= x a: xy, = (xy,-y) (y, y
other
telegram-58133
asked
Feb 23, 2020
0
answers
(chatquestion)...Ph 8. Mg НСНО → Y; Нуо Ether `Br Product 'Y'is : Ph (a) (b) Ph ОН "CH—ОН Ph, (c) ОН (d) None of these
other
telegram-58131
asked
Feb 23, 2020
0
answers
(chatquestion)...USTWALD Which of the following species can act both as Bronsted acid and base? a. HBr b. NO, C. HCO3 d. HI 1. LASU 2017, Q. 35
other
telegram-58127
asked
Feb 23, 2020
0
answers
(chatquestion)...74 The percentage strength of H,O, solution obtained by mixing equal volumes of two H,O, solutions of "10 volume" and "20 volume" strength is 83. (1) 0.45 2) 4.55 (3) 15 (4) 9...(Solve it plz)
other
telegram-58125
asked
Feb 23, 2020
0
answers
(chatquestion)...y" +y = x² s in2x...(how could solve this question ?)
other
telegram-58117
asked
Feb 23, 2020
0
answers
(chatquestion)...bluish tinge Un SKIll, Ilanj un (4) All of the above 108. In an accident, a man dies immediately although 108. their was no injury to brain, kidney, stomach and heart, The probable cause of death may be :- (1) Coagulation (2) Digestion stopped (3) Diaphragm got punctured (4) Larynx got punctured inuous rings in trachea are incomplete 109...(??)
other
telegram-5123
asked
Feb 23, 2020
0
answers
(chatquestion)...A far sighted person can see object beyond 71 cm clearly if separation between glasses and eye lens is 2 cm, then find focal length of glass? 30 35 (1) 23 cm (2) 34.5 cm (3) 18.4 cm (4) 30 cm Y If velocity of an electromagnetic wave in a medium...(ye kese solve hoga...)
other
telegram-5119
asked
Feb 23, 2020
0
answers
(chatquestion)...23. When mass M, is suspended from the lower end of an uniform string, its equilibrium length is I,. When two mass M, and M, both are suspended from its lower end, its equilibrium length is I,. The natural length of the wire is M24 - M,l2 (2) M, + M2 M1 (4-2)+4 (1) M2 4+/2 (3) (4) Jilz
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telegram-58109
asked
Feb 23, 2020
0
answers
(chatquestion)...NOTES COOH S03H 503H...(Aisa kuch ayega kya
other
telegram-58107
asked
Feb 23, 2020
0
answers
(chatquestion)...***...(Toh yeh hai kya Autumn
other
telegram-58101
asked
Feb 23, 2020
0
answers
(chatquestion)...Cooy MgBL
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telegram-58098
asked
Feb 23, 2020
0
answers
(chatquestion)...NGC Mg Bz (d mole)
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telegram-58092
asked
Feb 23, 2020
0
answers
(chatquestion)...P= Bx AV Pzp Pzp(AR AR ERROR Concent 2. 3.
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telegram-58085
asked
Feb 23, 2020
0
answers
(chatquestion)...The bulk modulus of a spherical object is 'B'. If it is subjected to uniform pressure 'p', the fractional decrease in radius is :- B (1) Зр Зр (2) 3B (3) (4)
other
telegram-58070
asked
Feb 23, 2020
1
answer
(chatquestion)...Mez Cule Product H200...(What is the func of this reagent?)
other
telegram-58064
asked
Feb 23, 2020
1
answer
(chatquestion)...A liquid of density p is coming out of a hose pipe of radius a with horizontal speed v and hits a mesh. 50% of the liquid passes through the mesh unaffected. 25% looses all of its momentum and 25% comes back with the same speed. The resultant pressure on the mesh will be (a) pv2 (b) ov (c) (d)...(Solve this...)
other
telegram-58061
asked
Feb 23, 2020
0
answers
(chatquestion)...heragoral felas Ph MgB Preodiect ంత HO (9b) Ph (d) Ph
other
telegram-58056
asked
Feb 23, 2020
1
answer
(chatquestion)...**3. Find the area enclosed by the curves y? = 4x and y? = 4(4 – x). (Mar-2011, 2007) %3D %3D
other
telegram-58053
asked
Feb 23, 2020
1
answer
(chatquestion)...%23 The reaistance of 0.2 molere Sousion of electratyfes u the Conductivity of The resistance' of Same electrolyter u hoas Conductivity of the solus" ü 1.4. 0'5 molak selus" of 200 2.find the 0'5 molar solus".
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telegram-58049
asked
Feb 23, 2020
0
answers
(chatquestion)...60. Which of the following has highest enol content. (1) (2) H. (3) C,H,O CH3 (4) C,H,O- ОСН.
other
telegram-58036
asked
Feb 23, 2020
0
answers
(chatquestion)...energy spent in this process. Tempaer Solution 4 R As volume of water remains constant, so R3 Increase in surface area AA = n (4ar) - 4TR? = 47(n/3 -1) R2 = 4n(100 – 1)10-6 .. Energy spent = TAA = 4n x 99 x 10-6 x 72 x 10-3 = 89.5 x 106 J BEGINNER'S BOX-6 A stick of length 4 cm is floating on the surface of water. If one side of it has surface tension of 80 dyne/cm and on the other side by keeping a piece of camphor the surface tension is reduced to 60 dyne/cm, then find the resultant Torce (in dyne) acting on the stick. (resultant felce ene side) %3D on A thin wire ring of radius 1m is situated on the surface of a liquid. If the excess force required to lift it upwards (before the liquid film breaks) from the liquid surface is 8 N. calculate the surface tension of liquid? A circular frame made of 20 cm long thin wire is floating on the surface of water. The surface tension of water 3. is 70 dyne/cm. Calculate the required excess force to separate this frame from water ? A metallic wire of density d floats horizontally in water. Find out the maximum radius of the wire so that the wite may not sink. (surface tension of water T) A rectangular film of liquid is 5 cm long and 3 cm wide. If the work done in increasing its area to 9 cm x5 cm is 6 x 104 joule, find the surface tension of the liquid ? 5....(1 Ques btado plz)
other
telegram-5104
asked
Feb 23, 2020
0
answers
(chatquestion)...3 R2=2JE YT=R ZR2=2,1tSRE=2J2 29.=286 0n she Owthe praphyf ho fined Qi Ro tah Chekdigtor 6i Totai Eurrent :- O Inthe fiken ůr cuits thown Nfhen find the ralhe of Rad I NT-18V 27
other
telegram-58032
asked
Feb 23, 2020
0
answers
(chatquestion)...( -चे (+) उेच पेचे 2.-...(How can i solve this? Can someone please help?)
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telegram-57997
asked
Feb 23, 2020
0
answers
(chatquestion)...Úgzinl) MOTAHEDOON 2-
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telegram-57995
asked
Feb 23, 2020
0
answers
(chatquestion)...3. If gravitational force between a planet and its satellite is inversely proportional to the distance between them (instead of square of distance between them) then orbital velocity of satellite vo depends on distance as (r is distance between centres of satellite and planet) 16.0km/s m/s (1) Vo (2) Vo c oltshov alns (3) Vo c (4) Vo c 1/2
other
telegram-57989
asked
Feb 23, 2020
0
answers
(chatquestion)...4.13 smooth A rod of mass M and length L is hung from the massless string as shown and kept stationary on a frictionless horizontal surface. The ratio of tension in the string to the force exerted by horizontal sur- face on the rod is (1) 1 (2) 2 tan 0 (3) cot 0 (4) 2
other
telegram-57982
asked
Feb 23, 2020
1
answer
(chatquestion)...18. Coiling of garden pea tendrils around any support is an example of (a) thigmotaxis (c) thigmotropism (b) ihigmonasty (d) thermotaxis. (2010)
other
telegram-57978
asked
Feb 23, 2020
1
answer
(chatquestion)...15, If lift mvoes upwards with acceleration of 7m/s, then net force on block of mass 5 kg is :- LIFT N2Mg |2kg 0 5kg 10kg (b l) (b 85 N (2) 50 N (3) 70 N (4) 35 N...(How is the answer 4)
other
telegram-57976
asked
Feb 23, 2020
1
answer
(chatquestion)...from the origin, the distance covered by it in 3 s is (1) 12 m (3) 24 m Two balls are projected simultaneously with the same speed from the top of a tower, one vertically upwards and the other vertically downwards. They reach ground in 9 seconds and 4 seconds respec- tively. Height of the tower is (Take g 10 ms) (1) 100 m 431 180 m A car 'A' crosses a certain point on the road mov- ing with a uniform velocity of 20 m/s att-D0. Af- 7. The ratio of time taken by 6 kg mass to drop th (1) 16:9 (3) 3:4 siuie (21 18 m (4) 36 m 6. A particle moves along x- 4t-2)+3(t-2) where x is in meter an (2) 120 m (4) 200 m (1) initial velocity of 2 acceleration of p (3) particle is at orie (4 All of these 3. An object starts with acceleration. W Sv only the reversed. The ve ter 4 sec. another car 'B' starts from the same point with a uniform acceleration of 2 m/s. Time t after which 'B' overtakes 'A' is approximately. 15 sec. (1) (3) 27 sec. (2) 22 sec. (4) 35 sec. point is-Nv, w (1) 6 A man is 45 8. acceleratin...(2nd and 3rd ques)
other
telegram-57964
asked
Feb 22, 2020
1
answer
(chatquestion)...7. Among the fol lowing the one which reacts most readily with ethanol is (a) p-nitrobenzyl bromide (b) p-chlorobenzyl bromide (c) p-methoxybenzyl bromide (d) p-methylbenzyl bromide [2004]
other
telegram-57959
asked
Feb 22, 2020
0
answers
(chatquestion)...01. Ifa resistance is measured in terms of a unit 'u' made by combining the electric current, T, Bohr radius 'ao, Planck's constant 'h'and speed of light 'c' then: hc2 (1) Pao h°c (2) Pad h°c³ (3) Paổ hc3 (4) Pao 3....(Pls Solve this ques)
other
telegram-57949
asked
Feb 22, 2020
0
answers
(chatquestion)...Naphthalene and benzoic acid can be separated from each other best by the method of (1) Crystallisation (2) Sublimation (3) Distillation (4) Chromatography...(Please help)
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telegram-57943
asked
Feb 22, 2020
0
answers
(chatquestion)...Example 24: Acceleration of particle is a=bt m/s?, 2. where b is a constant. Find the velocity and displace- ment of the particle at t seconds, if initially it was mov- ing with speed of 'u' m/s. 1nt² -ht2 Position
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telegram-57934
asked
Feb 22, 2020
1
answer
(chatquestion)...(d) none of these 2. When an atomic gas or vapour is excited at low pressure, by passingan electric current through itthen (a) emission spectrum is observed (b) absorption spectrum is observed (c) band spectrum is observed (d) both (b) and (c)...(Plz answer)
other
telegram-5093
asked
Feb 22, 2020
0
answers
(chatquestion)...In a vessel A 84 litres mixture of milk and water contains in the ratio 5:2. If x litres mixture from vessel A taken out and 12 litres water added into vessel A, then the ratio of milk and water becomes 3:2. Find the value of x.
other
telegram-57917
asked
Feb 22, 2020
0
answers
(chatquestion)...(c) 12 A (d) 14 A 25. A d.c. main supply of e.m.f. 220 V is connected across a storage battery of e.m.f. 200 V through a resistance of 1N. The battery terminals are connected to an external resistance 'R'. The minimum value of 'R', so that a current passes through the battery to charge it is : (a) Zero (b) 11 0 (c) 92 (d) 7 N 373
other
telegram-57912
asked
Feb 22, 2020
0
answers
(chatquestion)...A rod made from a particular alloy is heated from 25℃ to the boiling point of water. Its length increases by 8.47 x10−4m. The rod is then cooled from 25℃ to the freezing point of water. By how much does the rod shrink?
other
telegram-57910
asked
Feb 22, 2020
0
answers
(chatquestion)...2.A plano-convex lens has a maximum thickness of 6 cm. When placed on a horizontal table with the curved surface in contact with the table surface, then the apparent depth of the bottom most point of the lens is found to be 4 cm. If the lens is inverted such that the plane face of the lens is in contact with the surface of the table, then the apparent depth of the centre of the plane face is found to be 17 cm. The radius of curvature of the lens is (a) 68 cm (c) 128 cm (b) 75 cm (d) 34 cm
other
telegram-57907
asked
Feb 22, 2020
0
answers
(chatquestion)...(b) Cofactor (a) Regulator Which of the following is true, if in a DNA adenine is represented by a, guanine by b, cytosine by c and thymine by d? (c) Repressor (a) Promoter a)a+c=d + b In a DNA molecule adenine wi!l be equal to (b) a + d = b + d (e) a + c = c + d (d) a +c = b + c KThumine (d) Cytosine
other
telegram-5084
asked
Feb 22, 2020
1
answer
(chatquestion)...Dato: \8ane for matim 8e permetting Taeneformant ina vectoo heepin seleti Antibotic Rei gene r s competent ceee taonefos med cece secombirant ceee nonef aboue
other
telegram-5078
asked
Feb 22, 2020
0
answers
(chatquestion)...2. Two Carnot engines A and B are operated in series. Engine A receives heat from a reservoir at 600 K and rejects heat to a reservoir at temperature T. Engine B receives heat rejected by engine A and in turn rejects it to a reservoir at 100 K. If the efficiencies of the two engines A and B are represented by n, and np, respectively, then what is the value of nn¿? Ng/M4? 12 12 (c) 5 (a) 12 (b) 12 (d) 5...(Solve this...)
other
telegram-57898
asked
Feb 22, 2020
0
answers
(chatquestion)...A 2 kg block starts from rest on the positive x axis 3m from the origin and thereafter has an accelera- tion given by ā =(4 i + 3ĵ) m/s². At the end of 2 %3D s, its angular momentum in kg m²/s about the ori- gin is (1) O (2) 36k АЗ) 13) 48k (4) 96k
other
telegram-57892
asked
Feb 22, 2020
0
answers
(chatquestion)...4.13 smooth A rod of mass M and length L is hung from the massless string as shown and kept stationary on a frictionless horizontal surface. The ratio of tension in the string to the force exerted by horizontal sur- face on the rod is (1) 1 (2) 2 tan 0 (3) cot 0 (4) 2
other
telegram-57890
asked
Feb 22, 2020
0
answers
(chatquestion)...16. Pick ou (3) K,SO, (4) MNSO, (1) K 8. Colourless solution of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution will turn blue? su (2) Irc (3) Pe (1) KNO, (3) Zn(NO,), (2) AGNO, (4) ZNSO, (4) Ir Cu+ conc. HNO,(hot): of nitrogen); then X is: (1) N,O 9. Cu(NO), +X (oxide T. CrO, 3. is :- (2) NO2 (4) N,O3 (1) A (3) NO (3) A 18...(8 and 9 both?)
other
telegram-5060
asked
Feb 22, 2020
0
answers
(chatquestion)...A rocket is launched with velocity 10 km/s. If radius of earth is R, then maximum height attained by it will be [RPET 1997] 8. (a) 2R (b) 3R (c) 4R (d) 5R...(Solution of this mcq)
other
telegram-57881
asked
Feb 22, 2020
1
answer
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