Recently Active Questions

Most of us aren't happy with JEE-2010 and the way it was conducted?Can we do something?Can we have a re-exam? those in support of a re-exam do reply here............ ...

A rubber band with initial length L has one end tied to a wall. At t = 0, the other end is pulled away from the wall at speed V (assume that the rubber band stretches uniformly). At the same time, an ant located at the end no ...

1.How many 4 digit numbers divisible by 4 can be made with the digits 1,2,3,4,5 if repitition of the digits is not allowed? 2.Determine the number of natural numbers smaller than 104,in the decimal notation of which all the d ...

a healthy young man standing at a distance of 7m from a 11.8 m high building sees a kid slipping from the top floor . with what speed (assumed uniform ) should he run to catch the kid at an arm height (1.8m) ...

if a person is walking in south direction with a speed of 20 m/s and in that time the direction of the wind ne direction and if the person increases the speed and walking with a speed of 40m/s then the direction of wind will ...

a ball is dropped from a height of 5m onto a sandy floof and penentrates the sand upto 10 cm before coming to rest . find the retardation of the ball in sand assuming it to be uniform. ...

1)The metre is defined as the distance by travelled light in 1/299,792,458 second. Why didn't people choose some easier number such as 1/300,000,000 second? Why not 1 second? 2)Suppose you are told that the linear size of eve ...

A person sitting on the top of a tall building is droping ball at regular intervals of one seconds .Find the position of 3rd,4th,and5th ball when the sixth ball is being dropped. ...

I couldn't solve this.- Rain is falling vertically with a speed of 30m/s.A woman on a bicycle is travelling with a speed of 10m/s in the north to south direction.In what direction should she hold her umbrella in order to prot ...

1.find the condition that the root of the equation ax^2+bx+c=0 may differ by 5. 2.if the equation x^2+px+q=0 and x^2+p'x+q'=0 have a common root ,show that it must be equal to pq'-- p'q/q--q' or q--q'/p'--p ...

how is A DAS GUPTA subjective for practising problems for JEE?? ...

a sample of C2H2 gas has a pressure of 7.8 kpa. After some time a portion of it reacts to form C6H6 gas . The pressure of mixture of gases is then 3.9 kpa . Assuming constant V and T , find the fraction of C2H2 that has under ...

Please give an answer with reasons as to why it is preferred / not preferred ? ...

All those who have passed out from class XII this year that is 2009 and are going to give IIT next year please post ur name.... May be we can keep in touch...,cuz it's v depressing to be alone and think ur the only one who is ...

An NCC is going at a uniform speed of 6 Km/hr through a place under a berry tree on which a bird is sitting at height of 12.1m. At a particular instant the bird drop a berry . Which cadet (give the distance from the tree at t ...

in a soccer practice session the football is kept at the centre of the field 40yards from the 10ft high goalpoast. a goal is attempted by kicking the football at a speed of 64ft/s at an angle of 45° to the horizontal. will t ...

find the no. of ways of distributing 10 identical balls in 3 boxes so that no box contains more than 4 balls and less than 2 balls... ...

when is the 4 th rnd of AIEEE? ...

In d Modern Physics chapter in our syllabus(ICSE X), under d Beta emission heading i found something called "anti-neutrino". wud nyone plz say wat is dat. ...

A piece of metal of 2kg-wt is suspended from one end of a vertical wire whose end is fixed and the piece is fully immersed in an oil od density 0.7*1000 kg/m3 .The length of the wire increases by 1mm.If the diameter of the wi ...

1.Three particles are situated at 3 vertices of a triangle ABC of side a.Each particle moves with a speed v such that A moves towards B, B towards C and C towards A.Find the trajectory of the the particles. ...

The dissociation constant of a substituded benzoic acid at 25 degree C is 10-4 The pH of a 0.001 M solution of its sodium salt is ...

If f(x) \epsilon [1,2] when x \epsilon R and for a fixedreal number p f(x+p) = 1 + f(x)- {f(x)}2 for all x \epsilon R then prove that f(x) is a peroidic function. ...

Find the following limit for \alpha >1 : \lim_{n\to \infty} n\left(\dfrac{1^\alpha + 2^\alpha + \ldots + n^\alpha}{n^{\alpha+1}}-\dfrac{1}{\alpha +1}\right) Here n is a natural number. ...

TOTAL 2 PROBLEMS *Image* It Came in IITJEE 1999 How To Solve This One ?? PLease solve it in DETAIL Stating HOW you got this ! *Image* Answer in "nCr" or Factorial Form !! ...

1) How to evaluate dis ?????? *Image* How to evaluate dis ?????? ...

Mr and Mrs. Bajaj invite three other couples to a party and as usual some people shake hands. Spouses do not shake hands with each other. At the end of introductions, Mr. Bajaj asks all others including Mrs. Bajaj how many ti ...

Let {D1,D2.......,Dn}be the set of all third order determinants that can be formed with the distinct non-zero real numbers a1,a2....,an,then (A) \sum_{i=1}^{}{n} Di=1 (B) \sum_{i=1}^{}{n} Di=0 (C)Di=Dj for all i,j (D) none. A ...

In the relation; P= α/β e -αZ/kθ ,where P is pressure,Z is the distance,k is Boltzmann's constant and θ is the temperature.The dimensional formula for β will be: a)[L2] b)[ML2T] c)[MT-1];here T is raised to the power -1 ...

Can we find a non-const. Polynomial which is prime for all integers x? The co-efficents of the Polynomial are all integers. ...