Recently Active Questions

If the complex sequence of numbers z0, z1, z2........satisfy z_0=i+\frac{1}{137} and for n≥1 z_{n+1}=\frac{z_n+i}{z_n-i} then find the value of z2007 ...

1.the radii r1,r2,r3 of escribed circles of a triangle ABC are in harmonic progression.if its area is 24 sq.cm. and its perimeter is 24 cm,find the lengths of its sides. ans:6,8,10 2.In a triangle ABC,if A:B:C =3:5:4,then a+b ...

plz balance the following equations: 1)KMnO4 + FeSO4 + H2SO4->K2SO4 +MnSO4 + +Fe2(So4)3 + H2O [ by oxidation no. method ] 2) Cr2O7 + NO2- -> Cr3+ + NO3- [by half reaction method] ...

Why is the outer layer of optic fibre has refractive index of 1.48 and inner layer has refractive index of 1.5? Why didn't they have anyy other value of refractive index? How is it applicable to total internal reflection? ...

*Image* find the acceleration of the 1 kg mass!! :D ...

guys , in this thread i want u to share everything u know abt shapes of orbitals.... basically a type of discussion some questions also..... so plzz come on.... ...

a well known one, but still very amusing(i think this has been already been discussed but still): An airplane has 100 seats, and 100 passengers were assigned seats. The first passenger enters the plane and rather than sitting ...

plz can ne1.... provide me the graph 4 f(x) = sin n x n= 1,2,3,.......... ...

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This qsn cud have been in the MO section, but it's way easier than an Olympiad problem, as such. Define a function f over the set of naturals as f(n)=n! Now let a positive real a have the decimal representation as a=0.f(1)f(2 ...

Let a1=0 and a2=1. an= n/2 an-1+ n/2 (n-1)an-2+(-1)n(1- n/2 ). Find f=an+2 nC2an-1 +3 nC3an-2+...+na1. ...

The IIT-K will be coordinating the IIT Joint Entrance Exam (IIT-JEE) for 2011. The members of the IIT Joint Admission Board (JAB) will be attending a meeting at IIT-K on August 21 to finalise the schedule. Representatives of ...

*Image* the net force acting on the particle shown if figure is: 1. m a (vector) 2. F(vector) 3. F(vector) + m a (vector) 4. F(vector) - m a (vector) ...

Prove that for all real a,b and c satisfying: a^3+b^3=c^3 the following inequality holds: a^2+b^2-c^2> 6(c-a)(c-b) ...

1)For which of the following reversible reactions Kp may be equal to 0.5 atm and how? a)PCl5 ---------------> PCl3 + Cl2 b)N2 + 3H2 ---------> 2NH3 c)2NO2 ---------------------> N2O4 2)A 1 litre container contains 2 ...

Q) Why is Wurtz reaction not given by tert. alkyl halides? ...

It was his own struggle against poverty that helped Anand Kumar to get where he is today – the iconic maths coach, with a 100% success rate in helping his students crack the tough IIT Joint Entrance Exams. His Patna-based S ...

It has been almost a week now and ccb is still not showing the indicative seats...a message"your choices have not been processed yet " is being displayed.....is everyone facing a similar problem..??? plzz reply.. ...

1.select the correct alternatives (a)Work done by the friction is always zero. (b)Work down by the kinetic friction can be positive (c)Kinetic energy of the system can not be increased without applying any external force (d)W ...

In electron's frame of reference, attractive electrostatic force is balanced by centrifugal force [don't chuckle to read that word as many including me often do ;)] and thus doesnot move! (remember we are in electron's refere ...

please solve pg 166 Q12). 2 conducting spheres radii R1 and R2 kept separated if spheres connected by conducting wire, find capacitance Ans = 4*pi*epsilon not*(R1+R2) Why is it parallel Q47.b) capcitor 5 microfarad charged to ...

1) In a series resonant LCR circuit the voltage across R is 100V and R= 1KΩ, C=2μF. The resonant frequency ω is 200 rad s-1. At resonance, the voltage across L is: a)40 b)250V c)4*10-3V d)2.5*10-2V 2)A coil of inductance 3 ...

*Image* Five identical capacitor plates each of area A are arranged such that adjacent plates are at a distance d apart. The plates are conneted to a source of emf V as shown.What is the magnitude and nature of charge on plat ...

let y=f(x) be differentiable function for all x belongs to R . then which one of the following is always true : (a) d2y/dx2 - (dx/dy)3 =0 (b) d2y/dx2+ (dy/dx).d2x/dy2 =0 (c) d2y/dx2 - (dy/dx)3 = 0 (d) none of these ...

*Image* is treated with H2SO4 and heated. Wat is d product formed???? ...

A step down transformer reduces 220V to 11V. the primary draws 5amp. of current and the secondary supplies 90amp. The efficiency of transformer is: 1) 20% 2)44% 3) 90% 4)100% ...

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Ragging today denotes verbal, physical and sexual harassment of students. ‘BusAurNahin’ is an anti ragging drive to create awareness amongst students and enforce anti ragging act in colleges. I am supporting this nationwi ...

a spotlight S rotates in a horizontal plane with a constant angular vel. of o.1 rad/s . The spot of light P moves alsong the wall at a distance of 3 m .What is The vel. of the spot P when angle is 45? *Image* Q2 . on friction ...

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