Questions asked by Shreya

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• The solubility of Pb(OH)2 in water is 6.7 *10^-6 M.What is its solubility in a buffer solution of pH=8 ?
  
• 200 ml of aqueous solution of HCl(pH=2) is mixed with 300 ml of an aqueous solution of NaOH(pH=12).what is the pH of the resulting solution?
  
• A ceiling fan starts rotating from rest with angular acceleration varying as `A=D^(1/2)` where D is the angular displacement magnitude.how does its angular velocity vary with respect to D?
  
• Two particles A and B of mass 2 kg and 3kg are thrown from the top of a tower such that A moves horizontally with vel. of 30m/s and B moves vertically up with vel. of 20m/s(g=10m/s^2).What is the acceleration of the centre of mass of the system?
  
• Two persons A and B of mass 50 kg and 100 kg are standing at extremities of a boat of mass 100 kg with length 5 m floating at rest in still water.What the distance moved by the boat if they interchange their positions ?
  
• If moment of inertia of a point particle at a distance r from an axis would have been defined as I=mr,then what will be the M.I of an uniform rod of mass M and length L about an axis passing through its centre and perpendicular to the rod?
  
• The temperature of a `"15-mL"` strong acid solution increases by `2^@"C"` when `"15 mL"` of a strong base is added. By how much should the temperature increase if `"5 mL"` of each are mixed?
  
• A particle of mass m is projected with initial speed u at an angle of 45 degree with the horizontal.What is the torque of the force on the object about point of projection at the highest point?
  
• Between two positive real nos. a and b there are 2 G.M's G_1 and G_2 and a single A.M A.The G.M between G_1 and G_2 is M.Can you prove that M^3=ab(A^3)?
  
• If a,b and c are in G.P and the equations ax^2+2bx+c=0 and dx^2+2ex+f=0 have a common root,can you prove that d/a,e/b and f/c are in A.P?
  
• A person when asked about his age,said,"The day before yesterday i was 15 and i will be 18 the next year".Is it possible that he is telling the truth?
  
• What is the concentration of ferrous ion?
  
• What is the value of `gamma` for a polyatomic gas?
  
• Find the value of x?
  
• A gas is filled in a vessel of volume V at 35 degree centigrade.To what temperature should it be heated in order that half of the gas may escape out?
  
• What is the exact mechanism that causes Parkinson's disease?
  
• A solid sphere of radius R is pulled by a force T acting at the top of the sphere . The sphere is in pure rolling. what is the work done by the force when the centre of mass moves by a distance 'd'?
  
• An arched bridge is to be designed that cars may pass over safely a a speed of 180km/h without jumping off the road.what should the minimum or maximum value of the radius of curvature of the arch be?
  
• Why does methyl(CH3) show electron donating effect?
  
• Find the derivative of `f(x)=log(sin(x))` using the first principle?
  
• Please help?
  
• Which of the following is more stable?
  
• How can i derive newton's law of cooling?
  
• What is the difference between SHM and oscillatory motion?
  
• In the equation of a standing wave where y=2Asin(kx)cos(wt),what does 'w' represent?is it representing the standing wave's frequency or the frequency of any particle in that wave?
  
• The sound intensity level at a point 4 m from the point source is 10 dB,then what will be the sound level at a distance 2 m from the same source?
  
• What do you mean by the resonance frequency of a tuning fork or a stretched string?
  
• When do we use the prefixes iso,neo tert,sec when we name organic compounds?
  
• Please help with this physics problem?
  
• What is the coefficient?
  
• Can anyone prove this please?
  
• Even if i keep on increasing the frequency,why does the no of photo-electrons emitted from a metal surface reach a maximum and remain constant at that value?
  
• What is the relation between photoelectric current and the intensity of the photon provided?
  
• What do you mean by an electron wave?how come an electron generates a wave while it moves?
  
• What are the nodal planes in `3d_(x^2-y^2)` orbital?
  
• The resultant of 2 forces at right angles is 17 N.if the maximum resultant is 23 N,then what is the value of the greater force?
  
• Please solve with a detailed explanation?
  
• Please help?
  
• The acceleration of a particle is increasing linearly with time t as bt. The particle starts from the origin with an initial velocity V_O.The distance traveled by the particle in time t will be?
  
• Differentiate with respect to x from the first principle?
  
• Why is cyclo octatetraene non-aromatic?Please give a detailed explanation?
  
• A train accelerates from rest at a constant rate `alpha` for distance X and time T(a).after that it retards at a constant rate `beta` for distance Y and time T(b).Which of the following relations is correct?
  
• If the equation of a progressive wave is `y_1=asin(omega t-kx)`,then what is the equation of its reflected wave at a free boundary?
  
• What is the charge on `Co` in `[Co(CN)_6]^(-3)`?
  
• Is `Ni(CO)_4` a complex compound?
  
• If the vibrations of a string are to be increased to a factor of 2,then what should the tension in the string be made?
  
• The time period of S.H.M of a particle is 12 seconds. What is the phase difference between the position at t=3 s and t=4 s?please give a detailed explanation.
  
• What is the IUPAC name?
  
• Why is weightlessness experienced by astronauts when a satellite revolves around the earth?
  
• Why are rockets launched eastward at Cape Canaveral?
  
• A vertical rod A of mass m rests on the inclined surface of a wedge B of mass M?
  
• In the arrangement the coefficient of friction between the 2 blocks is`mu=1//2`What is the force of friction acting between the 2 blocks?
  
• What is the difference between gerund and participle?
  
• What is the relative error in the effective resistance in a parallel combination?`R_effective=frac{R_1xxR_2}(R_1+R_2)`.So what will `Delta(R)//R` be?
  
• How can the temperature of a gas be raised without supplying any heat to it?
  
• Please help?
  
• Which of the two `O_2NCH_2CH_2O` or `CH_3CH_2O^-` is expected to be more stable and why?
  
• Please solve this?
  
• Find therange of `f(x)=|x-1|`?
  
• Between the roots of the quadratic equation `3px^2 -10px +5q`=0(`p>0,frac{q}p<frac{5}3`),an odd number of A.M's are inserted and their sum exceeds their number by 10.Find the number of A.M's inserted?
  
• If `cos(alpha-beta) +cos(beta-gamma) +cos(gamma-alpha)=-frac{3}2`,can you prove that `cos alpha +cos beta +cos gamma=0` and `sin alpha +sin beta +sin gamma =0`?
  
• Vertices A(1,1),B(4,-2) and C(5,5) of a triangle are given.can you find the equation of the perpendicular dropped from C to the internal bisector of angle A?
  
• Through the vertex S of a parabola the chord SP and SQ are drawn at right angles.Show that the straight line PQ intersects the axis at a fixed point?
  
• Please solve q.26 part one? If `cot((alpha+beta)/2)+cot((beta+gamma)/2)+cot((gamma+alpha)/2)=0` **Rtp** `cosalpha+costheta+cosgamma=3cos(alpha+beta+gamma)`
  
• Prove that: `tan 70-tan 50+tan10=sqrt(3)`?
  
• Solve for x,y?
  
• If S be the sum,P be the product and R the sum of reciprocals of n terms in a G.P,prove that `P^2=(frac{S}R)^n`?
  
• A particle moves in the x-y plane with velocity `v_x`=`8t-2` and `v_y`=2.If it passes through the points `x=14` and `y`=4 at `t`=2,what is the equation of the path?
  
• 3 particles start from origin with velocity `u_1,u_2 and u_3`.They are moving with constant velocities.Find the relation between `u_1,u_2 and u_3` so that all 3 particles lie on the same plane?
  
• Please Help?
  
• A liter of air containing 1% Ar is repeatedly passed over hot Cu and hot Mg till no reduction of volume takes place. The final volume of Ar will be?
  
• In `ddotCX_2`,both the electron get paired up in `sp^2` hybrid orbital.Thus,`ddotCX_2` exists in the form of singlet state.Why?{here `X` refers to halogen}
  
• A spring balance has a scale that reads from 0 to 50 kg.The length of the scale is 20 cm.A block of mass `m` is suspended from this balance,when displaced and released,it oscillates with a period 0.5 s. What is the value of `m`?[`g=10 "m" s^(-2)`]
  
• 2 point masses each having mass `m` are placed at a distance `2a`.Escape velocity for a mass `m` projected from position P?
  
• The motion of a body falling from rest in a medium is given by the equation `d/dt(v)`=1-2`v`. What is the velocity at any time?Express in terms of time only.
  
• A body moves in a straight line under the retardation `a` which is given by `a=-bv^2`, (`b` is a positive constant and `v` represents the velocity). If the initial velocity is `2m/s`, what is the distance covered in time `t`=2 seconds?
  
• Find the number of solutions of this equation?
  
• A bag contains tickets numbered 1 to 30.Three tickets are drawn at random from the bag.Find the probability that the maximum number on the selected tickets exceeds 25?
  
• What is the acceleration of mass `m`?[take g=10`m/s^2`]
  
• What is the IUPAC as well as the common name?[CH3-Methyl group;C2H5-Ethyl group]
  
• Please help?
  
• Can someone explain to me the difference between potential and potential energy in details?And,work done in a conservative force field is the difference in potential or potential energy?
  
• During the preparation of picric acid,sulphonation is carried out first and after that nitration.Why?And why does the sulphonic group get replaced by the nitro group?
  
• `Ca(OCl)Cl and H_2O` is added to `C_2H_5OH` to get compound A.After that we add `HNO_3` in one pathway X to get a product B .We add `CH_3COCH_3` to A in another separate pathway Y to get product C.What is A,B and C?
  
• When does `ROH` dissociate as `R-O^(-)` and `H^(+)` and as`R^(+)` and `OH^(-)`?
  
• Why do linked genes show a lesser inclination towards crossing over than incompletely linked ones?
  
• The electronic configuration of silver is`[Kr] 4d^(10) 5s^(1)`.so it requires only one electron to attain stable configuration.So why does it act as a Lewis acid?