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If 4x-y is divisible by 3, prove that 4x2+7xy-2y2 is divisible by 9. ...

A) 3 dice are rolled and 3 numbers a,b,c are selected, then probability that the 3 planes : ax+by+cz=0 bx+cy+az=0 cx+ay+bz=0 form 1) exactly 1 line is 0 2) a point is 105/108 3) a prism is 0 4) whole space is 1 (Multiple Choi ...

A body executes simple harmonic motion under the action of a force F1 with a time period 4/5s. If the force is changed to F2 it executes S.H.M with time period 3/5 s. If both the forces F1 and F2 act simultaneously in the sam ...

1)If a>0>b>c & the system of eqn ax+by+cz,bx+cy+az=0,cx+ay+bz=0 has a non trivial soln,then find nature of roots of (b+c)t2+(c+a)t+a+b=0 . From first 3 eqns i got a+b+c=0 what next ?? 2) Let (1+x)2n=a0+a1x+....+a2nx2 ...

Q1 *Image* Q2 *Image* Q3 Synthesise from benzene .. *Image* Q4 *Image* Q5 Identify best reducing agent in step2 *Image* ...

A uniform heavy rod of weight W, cross sectional area A, and length L, is hanging from a fixed support . young's modulus of the rod is Y . Find the elongation of the core. .... .... 1)What will be the answer 2)wont we conside ...

PLEASE EXPLAIN TO ME THE STEPS THAT I'M SHOWING HERE : *Image* This is a popular Irodov problem. (FLUID IS FILLED UPTO THE BRIM ). I am putting down a few lines of what i can't understand here ..... if you have good will....p ...

A)Na p)CCP B)Cu q)BCC C)Au r)12 D)K s)8 i thought we have to learn data only for NaCl...so whats all this ????or am i misinterpretting ? ...

*Image* a. 6 kg b. 4 kg c. 8 kg d. 10 kg ans is c ...

Q1 A open tank having non viscous liquid to height 5m is palced over gorund.A heavy spherical ball falls from height 40m over the ground in tank.Find height to which ball will go back.Collison b/w ball and bottom of tank is e ...

1)A:Negative work is done on water vapor in air molecules that ocndense on outside of glass of cold water R:Temperature of condensing molecules is getting decreased due to condensation 2)A:A flywheel is a disc shaped body of ...

If a triangle is inscribed in a rectangular hyperbola,the locus of its orthocentre is ? ...

*Image* latex not working here....thats why posted like this.. ...

A request to all who spend time here...especially the seniors....can u please start a thread on graphs...how to draw them using and without using calculus ,......., asymptotes and everything....for THE BEGINNERS ? ...

1) *Image* The figure shows an inductor and Resistance connecdted in series across a battery of EMF=V. Choose the correct options. At time t=0, i) Potential drop across Inductor is 0. ii) Potential drop across Inductor is V. ...

can someone upload his 11th class chemistry practical work?? ...

1.ABCD is a rectangle with A(-1,2) B(3,7) and AB:BC=4:3.If distance of the origin from the centre of the rectangle is d,then find [d]. ...

When a hydrogen atom emits a photon during the transition n = 5 to n = 1, its recoil speed is approximately (a) 4 m/s (b) 800 m/s (c) 3 mm/s (d) 0.1 mm/s ...

(1) Let I=\int_{1/2}^{2}{\frac{ln(t)}{1+t^{n}}}dt , find the sign of Integral for different values of n\varepsilon N +\left\{0 \right\} ...

5) angular displacement of the rod shown in figure below is defined as θ=(4∩/25)t2 where θ is in radian and time 't' in second . The collar B slides along the rod in such a way that its distance from O is r=12t2 where r i ...

Statement 1-Ag maybe prepared from Ag coins by treating them with HNO3 adn then with HCl to get AgCl but not directly treated with HCl Statement 2-HCl is not a good oxidising agent. ...

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In a college of 300 students, every student reads 5 newspapers and every newspaper is read by 60 students. The number of newspapers is : a. At least 30 b. At most 20 c. Exactly 25 d. None of the above ...

*Image* ans is give d. Plz tell me how the OH has been replaced ...... although double bond character is there ? ...

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1. lim x->0 (1+sin x) - (1- sin x) /x 2. lim x->0 xcos x -sin x/x2sin x ...

(1) Find (+ve) integral solution of the equation 3x^{2}-2xy+7y^{2}=0 (2) find Integral solution of the equation x^{3}+11^{3}=y^{3} in 1st quadrant ...

1. Is cos x2 a periodic function ? 2. Find the fundamental period of the function 2cos x-Ï€/3 ...