Recently Active Questions

NEWLY ADDED QUESTIONS unsolved questions are underlined. 1.for what value of k the system of linear equations x+2y+x=1;x+3y+4z=k;x+5y+10z=k2 has solution?find the solution in each case. [roorkee 97] SOLVED 2.true/false(plz gi ...

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1)if *Image* then the range of f(x) is? 2)if the function f(x)=sinx+cosax is periodic, then a must be a)a rational number b)an integer c)any real number d)irrational ...

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\sum_{s=0}^{n}{(1)} = ( n + 1 ) how is it coming.... or shud we just remember it [12][12][12][12][12][12][12][12][12] ...

\sum_{s=0}^{n}{(1)} = ( n + 1 ) how is it coming.... or shud we just remember it [12][12][12][12][12][12][12][12][12] ...

P.T: (n c 0) (2n c n) - (n c 1) (2n-1 c n) +.... [(-1)^n] (n c n) (n c n)] =8 ...

The maximum speed that a van can have is 100km/h. The speed of the van decreases proportionally to the number of passengers. The train can carry a maximum of 7 people. If the speed of the train is 88km/h when it carries 3 peo ...

Which species is not coloured ? (a) Ni(DMG)2 (b) [Co(SCN)4]2- (c) [Fe(H2O)5SCN]2+ (d) [Al(OH)4]- ...

\int \frac{x^4-1}{x^2(x^4+x^2+1)^{\frac{1}{2}}}dx ...

1. A bag contains "W" white and 3 black balls. Balls are drawn one by one without replacement till all the black balls are drawn. What is the probability that this procedure for drawing the balls will come to an end at the r ...

I just dont know how to use pascal's equal height-equal pressure law in cases where the point of considerations are at same height BUT the level of liquid above each of them is different from other .. for eg : PLEASE SOLVE TH ...

Q1: A dog is sitting in a boat which is floating in a pond.The dog drinks some water from the pond.Prove that the level of water remains unchanged . My doubt : I dont know how to prove this BCOZ I DONT KNOW HOW TO CONSIDER TH ...

Which Nitrogen oxide does not have a coordinate bond ?? Its NO right ? ...

Q1. A neutral solid sphere has an unsymmetrical cavity in which in charge q is placed. Find potential at P. *Image* Q2. *Image* ...

A is an orthogonal matrix of odd ordeer such that |A|(x2+x+1) > 0, x belongs R. If I is a unit matrix of the same order as of A then value of |A(I+A2)-(I+A)(I+A2-A)| is equal to A) 1 B) -1 C) 0 D) 2 ...

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Q1 Solublity order Beso4,MgSO4,CaSO4,SrSO4 Q2 2nd ionisation enthalpy Cr,V,T,Mn Q3 *Image* ...

Let f (x) is a continuous function which takes positive values for x≥0 and satisfy \int_{0}^{x}{f(t)dt}=x\sqrt{f(x)} with f (1) =1/2. Then the value of f(\sqrt{2}+1) equals 2 ??? ...

Convert Benzene to - 1) Ph-CH2-CH2-D 2) Ph-CHD-CH3 3) para-D-(C6H4-CH2CH3) In not more than "X" no. of steps, where "X"→ ∞ .... :D P.S. They are Doubts. ...

1) Total no. of stereoisomers for- Me--CH(Cl)--CH=CH--CH=C=C(Me)--Me .....? 2) Total no. of products on MOnochlorination of n-Pentane in the presence of sunlight ? 3)Arrange in Decreasing order of Rate of ElectroPhillic Subst ...

An insect crawls up a hemispherical surface very very slowly. The coefficient of friction between the insect and the surface is 1/3. If the line joining the centre of the hemisphere to the insect makes an angle of \alpha with ...

*Image* 2 moles of the above compound + H+ ---> ...

Please can anyone propose mechanism for this *Image* ...

is there any shortcut to determine whether a species is paramagnetic or dimagnetic without actually writing the electronic configuration? ...

QUES : A BAG CONTAINS 3 WHITE, 3 BLACK AND 2 RED BALLS. ONE BY ONE ,THREE BALLS ARE DRAWN WITHOUT REPLACING THEM. FIND THE PROBABILITY THAT THIRD BALL IS RED. ...

In reformatsky reaction, why doesnt the ester get hydrolysed when H+ is added after the nucleophilic addition?? ...

Q1 *Image* Q2 *Image* Q3 Which of the following is true? (a) O2– is a hard ion (b) O2+ is a hard ion (c) O2– is liquid ion (d) Both (b) and (c) are correct. ...

will friction behave as a conservative force in quasi-static process? ...

let each of circles S1≡x2+y2+4y-1=0 S2≡x2+y2+6x+y+8=0 S3≡x2+y2-4x-4y-37=0 touches the other two. let P1,P2,P3 be the point of contact of S1 and S2, S2 and S3, S3 and S1 respectively. let T be the point of concurrence of ...