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Correlation coeffiecient between $x$ and $y$ is $0.5 \: cov ( x,y )=8$ and $\sigma_y=4$ then $ \sigma_x$ is
jeemain
math
cbse
class11
statistics
easy
analysis-of-frequency-distributions-(coefficient-correlation)
q100
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
If $ \sigma_x= \sigma_y$ and $x,y$ are related by $u=x+y\: v=x-y$ then $cov (u,v)$ is
jeemain
math
cbse
class11
statistics
analysis-of-frequency-distributions-(correlation-coefficient)
difficult
q42
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
If two variables $x, y$ are related by $ax+by+c=0$ with $ab < 0$ then correlation coefficient between $x$ and $y$ is given by
jeemain
math
cbse
class11
statistics
analysis-of-frequency-distributions-(correlation-coefficient)
difficult
q41
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
The value of covariance of two variable $x$ and $y$ is $- \large\frac{148}{3}$ variance of $x$ is $ \large\frac{272}{3}$ and variance of $y$ is $ \large\frac{131}{3}$. Then coefficient of correlation is
jeemain
math
cbse
class11
statistics
analysis-of-frequency-distributions-(correlation-coefficient)
easy
q91
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
Gas-A is kept in the left partition of the container with a temperature of T at pressure 2P. Gas-B is kept in the right part of the container with a temperature of 4T at pressure P. When what is the value of the Pressure P' when the partition is removed?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
medium
asked
Jan 31, 2014
by
balaji
1
answer
Gas-A is kept in the left partition of the container with a volume 2V at pressure P. Gas-B is kept in the right part of the container with a volume of 3V at pressure P. Both the portions are the same temperature T. When what is the value of the Pressure P' when the partition is removed?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
easy
asked
Jan 31, 2014
by
balaji
1
answer
If $x= \sec \theta -\cos \theta $ and $y=\sec^n \theta -\cos ^n \theta$ then $\bigg(\large\frac{dy}{dx}\bigg)^2=$
jeemain
math
class12
ch9
differential-equations
linear-differential-equations
q6
difficult
asked
Jan 31, 2014
by
meena.p
1
answer
Gas-A is kept in the left partition of the container with a volume V/n at pressure P. Gas-B is kept in the right part of the container with a volume of V/(n+1) at pressure P. Both the portions are the same temperature T. When what is the value of the Pressure P' when the partition is removed?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
easy
asked
Jan 31, 2014
by
balaji
1
answer
Consider the following case. What is the value of P' ?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
medium
asked
Jan 31, 2014
by
balaji
1
answer
Hot air balloon is an application of what law?
jeemain
physics
kinetic-theory-of-gases
easy
class11
ch13
behaviour-of-gases
ideal-gas-law
charles-law
asked
Jan 31, 2014
by
balaji
3
answers
Bursting of a soda bottle in summer is an example of ?
jeemain
physics
kinetic-theory-of-gases
easy
class11
ch13
behaviour-of-gases
ideal-gas-law
guy-lussacs-law
asked
Jan 31, 2014
by
balaji
1
answer
If the two lines of regression are $ 5x+3y=55$ and $ 7x+y=45$ then find the correlation coefficient between $x$ and $y$
jeemain
math
cbse
class11
statistics
analysis-of-frequency-distributions-(correlation-coefficient)
difficult
q40
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
Which of the following graphs will be linear with zero slope in case of an ideal gas?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
ideal-gas-law
easy
behaviour-of-gases
asked
Jan 31, 2014
by
balaji
1
answer
If SD of 15 items is 6 and each item is decreased by 1, find the SD of the new set.
jeemain
math
cbse
class11
statistics
variance-and-standard-deviation
easy
q90
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
Two diatomic gases have denisities d1 and d2 under similar conditions. The ratio of the root mean square velocities is?
jeemain
physics
kinetic-theory-of-gases
speed-of-molecules
easy
class11
ch13
kinetic-theory-of-an-ideal-gas
asked
Jan 31, 2014
by
balaji
1
answer
A container contains an ideal gas. The wall is hit by "n" molecules / second, each of mass "m" and moving the same velocity "u". The force exerted by the molecules on the wall is?
jeemain
physics
kinetic-theory-of-gases
speed-of-molecules
medium
class11
ch13
kinetic-theory-of-an-ideal-gas
asked
Jan 31, 2014
by
balaji
1
answer
Given $ n=10, \: \Sigma x = 3,\: \Sigma x^2=8,\: \Sigma y^2=9,\: \Sigma xy=3$ Find correlation coefficient
jeemain
math
cbse
class11
statistics
analysis-of-frequency-distributions-(correlation-coefficient)
difficult
q39
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
An ideal gas kept in vessel has rms spped of 200 m/s. If 10% of the gas leaks out of the vessel, then the rms speed of the remaining molecules is?
jeemain
physics
kinetic-theory-of-gases
speed-of-molecules
medium
class11
ch13
kinetic-theory-of-an-ideal-gas
asked
Jan 31, 2014
by
balaji
1
answer
A liquid is boiled and its temperature (T) versus Heat supplied (Q) graph is plotted. Which of the following is the correct graph?
jeemain
physics
kinetic-theory-of-gases
cbse
medium
class11
ch13
xtra
asked
Jan 31, 2014
by
balaji
1
answer
In a bivariate data $ \Sigma x = 30\: \: \Sigma y = 400 \: \: \Sigma x^2=196 \: \: \Sigma xy = 850 \: \: n=10$ \[\] Find the regression coefficient of $y$ and $x$
jeemain
math
cbse
class11
statistics
analysis-of-frequency-distributions-(regression-coefficient)
medium
q50
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
The one which is the measure of the central tendency is
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion
q89
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
The first of the two sample has 100 items with mean 15 and S.D= 3. If the whole group has 250 items with mean 15.6 and SD = $ \sqrt{13.44}$ the S.D of the second group is?
jeemain
math
cbse
class11
statistics
variance-and-standard-deviation
difficult
q38
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
If for an ideal gas, $\large\frac{R}{C_v} $$= 0.29$, it's shape is?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
easy
specific-heat-capacity
molar-specific-heat
asked
Jan 31, 2014
by
balaji
1
answer
If $r_{xy}$ between two variates $x$ and $y$ is 0.6 $ cov (x,y)=4.8\: \sigma_x^2=9$ then $\sigma_y$ is
jeemain
math
cbse
class11
statistics
variance-and-standard-deviation
difficult
q37
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
If $x= \cos^{-1} \bigg( \large\frac{1}{\sqrt {1+t^2}}\bigg) $ and $\; y= \sin ^{-1} \bigg( \large\frac{1}{\sqrt {1+t^2}}\bigg) $ then $\large\frac{dy}{dx}$
jeemain
math
class12
ch9
differential-equations
solving-using-separation-of-variables
q5
medium
asked
Jan 31, 2014
by
meena.p
1
answer
$x$ and $y$ are two correlated variables with the same standard deviation and the correlation coefficient $r$ , the correlation coefficient between $x$ and $x+y$ is
jeemain
math
cbse
class11
statistics
correlation-coefficient
difficult
q36
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
If $x^2+y^2=t-\large\frac{1}{t} ,$$x^4+y^4 =t^2+\large\frac{1}{t^2}$ then $\large\frac{dy}{dx}$
jeemain
math
class12
ch9
differential-equations
ordinary-differential-equations
q4
medium
asked
Jan 31, 2014
by
meena.p
1
answer
Which one of the following has a square planar geometry
jeemain
chemistry
class12
coordination-compounds
unit9
q39
medium
asked
Jan 31, 2014
by
sreemathi.v
1
answer
If $\phi (x) =f(x) g(x),$ where $f'(x) g'(x) =c$ and $ \large\frac {\phi ''}{\phi} =\frac {f''}{f} +\frac{g''}{g}+\frac{Kc}{fg}$ then value of K.
jeemain
math
class12
ch9
differential-equations
homogeneous-differential-equations
q3
medium
asked
Jan 31, 2014
by
meena.p
1
answer
The two variates $x$ and $y$ are uncorrelated and have standard deviation $ \sigma_x$ and $ \sigma_y$ respectively, the correlation coefficient between $x+y\: and \: x-y$ is
jeemain
math
cbse
class11
statistics
coefficient-correlation
difficult
q35
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with $Ca^{2+}$ ion
jeemain
chemistry
class12
coordination-compounds
unit9
q38
medium
asked
Jan 31, 2014
by
sreemathi.v
1
answer
In $Fe(CO)_5$,the $Fe-C$ bond poses
jeemain
chemistry
class12
coordination-compounds
unit9
q37
medium
asked
Jan 31, 2014
by
sreemathi.v
1
answer
The IUPAC name of the complex $[CO(NO_2)(NH_3)_5]Cl_2$ is
jeemain
chemistry
class12
coordination-compounds
unit9
q36
medium
asked
Jan 31, 2014
by
sreemathi.v
1
answer
Assertion : For the following equation degree $\large\frac{d^4}{dx^4} $$ +\sin \bigg ( \large\frac{d^2y}{dx^2}\bigg)=0$ Reason : Order of DE is the order of highest differentiate coefficient occurring in the equation
jeemain
math
class12
ch7
differential-equations
degree-of-a-differential-equation
q2
difficult
asked
Jan 31, 2014
by
meena.p
1
answer
Lines of regression of $y$ on $x$ and $x$ on $y$ are respectively $y=ax+b$ and $x=\alpha y+ \beta$. If mean of $x$ and $y$ series is same then its value is
jeemain
math
cbse
class11
statistics
easy
analysis-of-frequency-distributions
q88
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
Which of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour
jeemain
chemistry
class12
coordination-compounds
unit9
q35
medium
asked
Jan 31, 2014
by
sreemathi.v
1
answer
Median of $ ^{2n}C_0, ^{2n}C_1, ^{2n}C_2, ^{2n}C_3...... ^{2n}C_n$ ( where n is even ) is
jeemain
math
cbse
class11
statistics
easy
measures-of-dispersion-(median)
q87
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
Which of the following compound shows optical isomerism
jeemain
chemistry
class12
coordination-compounds
unit9
q34
medium
asked
Jan 31, 2014
by
sreemathi.v
1
answer
Solution of differential equation: $X^2= 1+\large\frac{1}{2} \bigg( \large\frac{x}{y}\bigg)^{-1} \frac{dy}{dx} + \large\frac{\bigg(\Large\frac{x}{y}\bigg)^{-2} \bigg(\Large\frac{dy}{dx}\bigg)^{2}}{4 \times 2 \times 1}+ \large\frac{\bigg(\Large\frac{x}{y}\bigg)^{-3} \bigg(\Large\frac{dy}{dx}\bigg)^{3}}{8 \times 3 \times 2 \times 1}+ \large\frac{\bigg(\Large\frac{x}{y}\bigg)^{-4} \bigg(\Large\frac{dy}{dx}\bigg)^{4}}{16 \times 4 \times 3 \times 2 \times 1}+..........$
jeemain
math
class12
unit9
differential-equations
solving-using-separation-of-variables
q1
difficult
asked
Jan 31, 2014
by
meena.p
1
answer
IUPAC name of coordination compound $K_3[Fe(CN)_6]$ is
jeemain
chemistry
class12
coordination-compounds
unit9
q33
medium
asked
Jan 31, 2014
by
sreemathi.v
1
answer
The standard deviation of $n$ observations $x_1, x_2, ....x_n$ is 2. If $ \sum_{i=1}^n x_i=20$ and $ \sum_{i=1}^n x_i^2=100$ then $n$ is $i=1$
jeemain
math
cbse
class11
statistics
variance-and-standard-deviation
medium
q49
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
The standard deviation of the numbers 31, 32, 33, 46, 47 is
jeemain
math
cbse
class11
statistics
easy
variance-and-standard-deviation
q86
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
Calomol $(Hg_2Cl_2)$ on reaction with ammonium hydroxide gives
jeemain
chemistry
class12
coordination-compounds
unit9
q32
medium
asked
Jan 31, 2014
by
sreemathi.v
1
answer
If the variance 1,2,3,4,5....10 is $ \large\frac{99}{12}$ then the standard deviation of 3,6,9,12....30 is
jeemain
math
cbse
class11
statistics
easy
variance-and-standard-deviation
q85
asked
Jan 31, 2014
by
thanvigandhi_1
1
answer
The oxidation state of Cr in the complex $[Cr(NH_3)_4Cl_2]^+$ is
jeemain
chemistry
class12
coordination-compounds
unit9
q31
medium
asked
Jan 31, 2014
by
sreemathi.v
1
answer
The correct order of magnetic moments (spin only values in B.M) among is
jeemain
chemistry
class12
coordination-compounds
unit9
q30
medium
asked
Jan 31, 2014
by
sreemathi.v
1
answer
In the circuit given below the value of current is :
jeemain
physics
class12
ch14
q100
easy
mock
junction-diodes
semiconductor-electronics
asked
Jan 31, 2014
by
meena.p
1
answer
Which one of the following has largest no of isomers
jeemain
chemistry
class12
coordination-compounds
unit9
q29
medium
asked
Jan 31, 2014
by
sreemathi.v
1
answer
A transistor is connected in common emitter mode. In the collector circuit the voltage drop across the resistor of $800 \; \Omega$ is $0.5 V$ . If current gain $\alpha$ is $0.96$ What is base current
jeemain
physics
class12
unit19
ch14
q99
medium
transistors
semiconductor-electronics
asked
Jan 31, 2014
by
meena.p
1
answer
Which one of the following complexes is an outer orbital complex
jeemain
chemistry
class12
coordination-compounds
unit9
q28
medium
asked
Jan 31, 2014
by
sreemathi.v
1
answer
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