Messages posted by Krishna Gopal Singh

Integral of x^n = x^(n+1)/(n+1) . If we take n = -1 this is x^0/0 which is not defined.

MM of methane is 16. If rate of diffusion of methane is twice that of x then MM of X is 4*16 = 64 units

No because there will be equall expansion of glass and mercury and mercury will not rise in glass tube on heating.

for zero tension at topmv^2/r = mg-kq^2/r^2. solve this to get v at top. V at bottom = sqrt(v^2+4*g*r)

If its given then you should consider it. If it is not given you can assume it to be infinite.

mobility = velocity/electric field so its unit is (m/s)/(V/m) = m^2/(V-s)

a metal rod A of 25 cm length expands by 0.050 cm when its temperature is rasied from 0 deg to 100 deg. another rod B of a different metal of length 40 cm expands by 0.040 cm for the same rise in temp. A third rod C of 50 cm length is made up of pieces of rods A and B placed end to end expands by 0.03 cm on heating from 0 deg to 50 deg. Find the lengths of each portion of the composite rod.

For rod A alpha_A = .05/25/100 = 2e-5

For rod B alpha_B = .04/40/100 = 1e-5

If composite rod is x cm A and 50-x cm B then

x*50*2e-5 + (50-x)*50*1e-5 = 0.03

x+50 = 60

x = 10

so composite rod is 10 cm A and 40 cm B

dU =Q-W = Q/2

so Q =2*dU = 28nCv*dT

hence specific heat = 2Cv

a679b is divisible by 8, so 79b is devisble by 8. so b is 2. It is divisible by 9 so sum is divisible by 9 so a is 3.

I am taking f(x) = (x/x)-(1/x)-1 = -1/x which has a range of R-{0}

If we have a vector V. Then unit vector parallel to V is given by V/mod(V)

Fe in + 1 oxidation state has 3 unpaired electrons hence it has a magnetic moment of sqrt(15) BM and sp3d2 hybridisation.

4. Two through two hydrogen atoms and two through 2 lone pairs of oxygen.

(c) is the right answer. In this case Fe exist as Fe+1 with d7 electrons and NO+ is diamagnetic. 3 unpaired electrons of Fe give it magnetic moment of sqrt(15) BM

If we use concave spherical mirror and put light source at focus then reflected light will be parallel only for paraxial rays. the rays away from axis will not be parallel. In parabolic reflector the reflected rays are parallel for all cases. that is why parabolic reflectors are used in search lights.

(c) is the right answer. Diastereomers may or may not be optically active.

i) Weight of water picked from first bulb is proportional to P.ii) Weight of water picked from second bulb is proportional to Po-Piii) Weight of water absorbed by CaCl2 is proportional to Po. From this data mole fraction of organic compound = 0.087/2.036 = (26.66/M)/((26.66/M)+200). Solve this equation to get M.

Vector AB = 6i + 6j - 6kVector AC = -5i -5j + 5kAs AC = (-5/6)AB we can say that ABC are colinear.

As both B and C will move for same time interval, ratio of distance will be equal to ratio of speed = 5/4

a and c cannot remain constant as they are vectors and their direction will change in circular motion. But b and d can remain constant as they are scalar.

Let us help you better in your preparations
Fill your details and get additional benefits of www.goiit.com

Mobile No:
Class:
City:

Preparing for JEE?

Kickstart your preparation with new improved study material - Books & Online Test Series for JEE 2014/ 2015

@ INR 5,443/-

For Quick Info