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Anirudh Kumar   Anirudh Kumar is offline Anirudh Kumar's messages in the community
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Catalogs Discussion Forums -> Science and Tech -> A compound `X` with molecular formula C2H4 burns with a soot -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

X is ethene. I don't think it will dissove in water . and it will not conduct electricity in any form. It wil have a low melting point.
Catalogs Discussion Forums -> Science and Tech -> Cinnabar is an ore of metal X.It exists in the lower order o -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

Cinnabar is HgS ore or Mercury.

1. The Ore is concentrated.

2. Reduction:- It is directly reduced by heating.

              HgS  +  O2   HgO  + SO2  

              HgO   + Heat    Hg  + O2

 

 
Catalogs Discussion Forums -> General Physics -> is ac current more benefitial or dc current n why? -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

Hey,but you cannot use AC for electrolysis or electroplating .  
Catalogs Discussion Forums -> Social Science -> What is communalism? -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

Communalism is the belief of supririority of one's religion over the other and that two religion cannot exist together. It is very much evident in India. It causes society to fragment over communal lines  
Catalogs Discussion Forums -> Algebra -> The coefficient of x8 in the expansion (2+x)2(3+x)3(4+x)4 must be (a)26 (b -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

27  ?? 
Catalogs Discussion Forums -> General Physics -> explain why the stars twinkle but not planets. -> Go to message
This Post 5 points    (1 Olaaa!! Perrrfect answer.   in 1 votes )   [?]

chirag explained it but in  simple language the total variation in amount of light entering our eyes from the planets average to be zero thus we do not experience twinkling effect in stars.
Catalogs Discussion Forums -> General Physics -> Please explain with figure- -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

explain how can the angle between two lines be 180. 
Catalogs Discussion Forums -> Science and Tech -> Pls answer this question A white compound reacts vigorously with water. The solution formed turns r -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

your compund is Calcium Oxide. CaO. It's to other uses are


1. Drying agent


don't know any other sorry. 
Catalogs Discussion Forums -> General Physics -> why sound need a medium to travel -> Go to message
This Post 7 points    (1 Olaaa!! Perrrfect answer.   in 2 votes )   [?]

sound is the energy that travels because of the vibrations it creates . It needs particles to vibrate and pass on the energy. thus it requires a medium fro propagation 
Catalogs Discussion Forums -> Magnetism -> Why are microwaves used in radar systems? -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

hey microwaves frequency is lower than UV and X-rays. 
Catalogs Discussion Forums -> Magnetism -> Why are microwaves used in radar systems? -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

microwavwes wavelength is high so I think that they are not scattered very easily that's why they are used in radar and satelitte commuications. 
Catalogs Discussion Forums -> Science and Tech -> what is water of crystallisation -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

water of crystallisation is the fixed no. of water molecules in loose chemical combination with a molecule of a hydrated salt. it gives the salt it's crystalline structure. for example Na2SO4.10H2O here 10H2O symbolises water of crstallisation .
Catalogs Discussion Forums -> Science and Tech -> ARE ELECTRIC GENERATORS &MOTORS INCLUDED IN 2008-2009 X CBSE BOARD EXAM? -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

WE have also been told in school that it has been deleted . but of basic priciples and construction can be asked. 
Catalogs Discussion Forums -> Science and Tech -> A student dropped few pieces of marble in dilute HCl contain -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

thank you


 
Catalogs Discussion Forums -> Science and Tech -> what is gypsum -> Go to message
This Post 5 points    (1 Olaaa!! Perrrfect answer.   in 1 votes )   [?]

it is chemically hydrated calcium sulphate CaSO4.2H2O  .  It is a hard substance. it is heated to form plaster of paris.
Catalogs Discussion Forums -> Differential Calculus -> why does the change 'h' has to be small in formula for derivation -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

why cannot it be a large change?
Catalogs Discussion Forums -> Magnetism -> The coil of a heater is cut into two equal halves and only o -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

2:1

 
Catalogs Discussion Forums -> Differential Calculus -> why does the change 'h' has to be small in formula for derivation -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
why does the change 'h' has to be small in formula for derivation?
Catalogs Discussion Forums -> Magnetism -> how can we find the force on a moving charged particle in uniform magnetic field?state rul -> Go to message
This Post 0 points    (0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]

Formula is   qvbsin  ,where   is the angle between the direction of motion of particle and direction of magnetic field.
Catalogs Discussion Forums -> Analytical Geometry -> PLZZZ SOLVE a rt triangle .,rt angled at A wose side AB=15cm ND AC =20cm is made to revolve -> Go to message
This Post 5 points    (1 Olaaa!! Perrrfect answer.   in 1 votes )   [?]

Hypotenuse will be 25 cm.  



ABCDBC    =>   AOCDOC


AOC= DOC = 90  


Let OC be X cm


so,BO= 25-x cm  


Here AD is the diamter of the double cone. Calculate


x= 16cm  BO= 9cm and AO= 12 cm


Now Volume=   1/3 r2(BO+OC)=  48*25*=1200 Ans.  
 
 
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