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If 2^x=3^y=6^-z,then what is the value of 1/x+1/y+1/z? How should I do this ? ...

A light wave was sent and it returned after 0.00001 secs .Then how much was the distance? ...

In a class of 70 students, the ratio to boys and girls is 4:3. Among girls the no of rich to poor girls is 1:4. If the ratio of rich and poor students is 8:27.Find the ratio of rich and poor boys in the class. ...

Convert ethanol to 2 methoxy propane ...

Dehydrobromination of A and B yield the same compound alkene C. C can regenerate A and B by addn of Hbr in the presence and absence of peroxide. 1,2 diphenyl ethane is obtained on reaction of C in presence of H+. Give structu ...

If x=2+2^2/3+2^1/3,show that x^3-6x^2+6x-2=0. I cannot match the answer. My answer = 6. Is there anything wrong with the Q or have I done something wrong in doing the sum? ...

A merchant has 3 different kinds of milk: 453 l, 493 l and 551 l. Find the least no of casks of equal size to store all the milk without mixing? How will I do this sum? ...

why does it appear that the morning sun moves faster than the midday sun? ...

A boy stands in front of a tall wall and claps. The boy continues to clap every time an echo is heard. Another boy finds that the time taken between the firs and 51st clap is 18s. v=? 330m/s 340 m/s 333m/s none ...

Speed of light in air or vacuum is (in cm/s) 3 X10^8 2 X 10^8 2 X 10^5 3 X 10^10 Your Answer d Correct Answer a HOW IT IS POSSIBLE WHEN IT IS IN CM/S? ...

for light to reflect obeying the laws of refection the surface must be smooth rough neither smooth nor rough any surface would do Your Answer d Correct Answer a BOTH IN SMOOTH AND ROUGH SURFACES LAWS OF REFLECTION ARE OBEYED ...

Which of the following is not the characteristic of the image formed by the pinhole camera? real Virtual erect B & D Your Answer c Correct Answer b THE CHARACTERISTICS OF A PINHOLE CAMERA STATES THAT THE IMAGE IS REAL,INVERTE ...

Image formed by a convex mirror is real virtual magnified B & C Your Answer b Correct Answer d Image formed by a convex mirror is always virtual,erect and diminished then why the answer is virtual and magnified?(option d) ...

If 9/10 of an iceberg is underwater what is the density of ice ? 9 gm per cc 900 kg per m^3 Both a and b 9 Kg per m^3 Your Answer b Correct Answer c How 9g/cc =900kg/m^3? ...

Here is an interesting one x+x+x+x.......x times..=x2 diff. both sides w.r.t x 1+1+1..x times=2x x=2x 1=2 ...

differential coefficient of sin-1(3x-4x3) w.r.t. sin-1x is : a) 3 if -1 ≤ x ≤ 1 b) -3 if -1 ≤ x < -0.5 c) 3 if -0.5 < x < 0.5 d) -3 if -0.5 < x ≤ 1 ...

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prove.. 1.cos2θcosθ/2-cos3θcos9θ/2=sin5θsin5θ/2 2.sinAsin(A+2B)-sinBSin(B+2A)=sin(A-B)sin(A+B) ...

Find the HCF of 2/3,4/6,8/27 Your Answer Not Attempted Correct Answer a a.2/27 how it is possible?the answer should be 1/27,and what about my marks? ...

The fractional representation of the no 11.457 11343/990 11457/1000 1138/999 11343/999 Your Answer a Correct Answer d HOW? 25)Which of the following nos. is between 0.1123476 and 0.1123571? 0.112523 0.1123473 0.1123473 Both a ...

find a positive integral solution to the equation- 1+3+5+.....................+(2n-1)/2+4+6+..........2n = 115/116 ...

what is the structure of elaidic acid ...

Given sin(θ+α)/cos(θ-α)=1-m/1+m Prove that tan(π/4-θ)tan(π/4-α)=m ...

Why tears come out of our eyes when we are very upset? ...

If ultrasonic, infrasonic and audio waves travel through a medium with speed v1 v2 and v3 respectively, then v1 = v2 = v3 v1 > v3 > v2 v1 < v3 < v2 v3 ≤ v1 and v1= v3 Your Answer b Correct Answer a 3 WAVES HAVE ...

A sample contains both H3PO4 and HIO3 along with other unknown substances.10 g of sample required 85 ml of 0.15 N NaOH during titration with phenolphthalein as indicator.A separate 10 g sample required 66ml of 0.15 N NaOH dur ...

Two thin similar convex glass pieces are joined together front to front,with its rear portion silvered such that a sharp image is formed 0.2 m for an object at infinity.When the air between the glass pieces is replaced by wat ...

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1. ∫ (cos 5x +cos 4x) / (1- 2 cos 3x ) dx 2. ∫ ( cos3 x ) . x. elog(sin x) .dx 3. ∫ ( x + ( x 2 ) + 2. x1/6 ) / [ x. { 1+ x } ] ...

1-bromo prop-1-ene + Bu-Li+ → A A+CuI + ether → B B+ 3-bromo cyclohex-1-ene → C what is C? plz briefly specify the mechanism ...