Recent questions tagged class11

Find the distance between the lines $3x-4y+2=0$ & $3x-4y+10=0$?

asked Feb 4, 2014 by sreemathi.v

1 answer

Find the equation of line which is parallel to $3x-4y+10=0$.Also find such line through the point (2,2)?

asked Feb 4, 2014 by sreemathi.v

1 answer

The length of perpendicular from the origin to a line is 6 and line makes an angle of $145^{\large\circ}$ with the positive direction of y-axis .Find the equation of line.

asked Feb 4, 2014 by sreemathi.v

1 answer

Find the equation of straight line passing through $(at_1,\large\frac{a}{t_1})$ & $(at_2,\large\frac{a}{t_2})$?

asked Feb 4, 2014 by sreemathi.v

1 answer

Find the equations of the bisectors of the angle between the co-ordinate axes?

asked Feb 4, 2014 by sreemathi.v

1 answer

Find the value of $m$ and $c$ if the straight line ( equation is $y=mx +c$ ) passes through the point $A(2,3)$ and $B(1,6)$.

asked Feb 4, 2014 by sreemathi.v

1 answer

Find the equation of a line which is equidistant from the line $x=\large\frac{15}{2}$ and $x=\large\frac{1}{2}$?

asked Feb 4, 2014 by sreemathi.v

1 answer

A line passes through the points $A(1,2)$ and $B(4,+2)$.Find the slope of the line parallel to AB ?

asked Feb 3, 2014 by sreemathi.v

1 answer

Find the angle between the lines whose slope are $\large\frac{3}{2}$ and 7?

asked Feb 3, 2014 by sreemathi.v

1 answer

Determine the value of $\lambda$ so that 1 is the slope of line passing through (1,1) and $(\lambda,4)$?

asked Feb 3, 2014 by sreemathi.v

1 answer

Find the inclination of the line whose slope is 1?

asked Feb 3, 2014 by sreemathi.v

1 answer

Karl - Pearson's coefficient of Skewness of a distribution is $0.4$ If SD is 6 and mean 40, then median of the distribution is

asked Feb 1, 2014 by thanvigandhi_1

1 answer

If SD of $X$ is $ \sigma $ then SD of $ \large\frac{aX+b}{c}$ ( where $a,b,c$ are constants ) is

asked Feb 1, 2014 by thanvigandhi_1

1 answer

The average speed of a car running at the rate of 15 km/hr during the first 30 km at 20 km/hr during the second 30 km and at 25 km/hr during the third 30 km is

asked Feb 1, 2014 by thanvigandhi_1

1 answer

For a perfect correlation between the variables $x$ and $y$ the line of regression is $ ax+by+c=0$ where $a,b,c > 0$ then $ r$ is

asked Feb 1, 2014 by thanvigandhi_1

1 answer

Two regression lines intersect at

asked Feb 1, 2014 by thanvigandhi_1

1 answer

If an experiment with 15 observations on $x$ the following results were available: $\Sigma x^2=2830 \: \Sigma x = 170$. One observation that was 20 was found to be wrong and was replaced by the correct value 30. The corrected variance is

asked Feb 1, 2014 by thanvigandhi_1

1 answer

In a college of 300 students every student reads 5 newspapers and every newspaper is read by 60 students. The number of newspaper is

asked Feb 1, 2014 by thanvigandhi_1

1 answer

For $a$ bivariate distribution $(x,y)$ if $ \Sigma x = 50 \: \Sigma y = 60 \: \Sigma xy = 350 \: \overline x = 5\: \overline y = 6 \: var \: x=4\: var \: y=9\: then \: r(x,y)=$

asked Feb 1, 2014 by thanvigandhi_1

1 answer

If two random variables $x$ and $y$ are connected by the relation $ 2x+y=3$ then $ r_{xy} = $

asked Feb 1, 2014 by thanvigandhi_1

1 answer

$cov (x,y) $ if $ \Sigma x = 55\: \Sigma y = 82\: \Sigma xy = 565\: n=8$ is

asked Feb 1, 2014 by thanvigandhi_1

1 answer

If $b_{yx} = \large\frac{1}{2}$ and $b_{xy} = \large\frac{2}{3}$ and $ \theta$ is the acute angle between the two regression lines then $ \tan \theta$ =

asked Feb 1, 2014 by thanvigandhi_1

1 answer

The dissociation energy of $H_2$ is 430.53 KJ$mol^{-1}$. If $H_2$ is exposed to radiation energy of wavelength 253.7nm, what % of radiant energy will be converted into kinetic energy ?

asked Feb 1, 2014 by sharmaaparna1

1 answer

A certain dye absorbs light of $\lambda = 4530 A^{\large\circ}$ and then fluorescence light of $5080 \;A^{\large\circ}$ Assuming that under given conditions $47\%$ of the absorbed energy is re-emmited out as fluorescence, Calculate the ratio of Quantum emitted out to the no. of quanta absorbed

asked Feb 1, 2014 by sharmaaparna1

1 answer

$O_2$ undergoes photochemical dissociation into one normal oxygen atom and one oxygen atom, 1.967 eV more energetic than normal. The dissociation of $O_2$ into two normal atoms of oxygen requires 498 KJ$mol^{-1}$.what is the maximum wavelength effective for photochemical dissociation of $O_2$ ?

asked Feb 1, 2014 by sharmaaparna1

1 answer

Correlation coeffiecient between $x$ and $y$ is $0.5 \: cov ( x,y )=8$ and $\sigma_y=4$ then $ \sigma_x$ is

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

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

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

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?

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?

asked Jan 31, 2014 by balaji

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?

asked Jan 31, 2014 by balaji

1 answer

Consider the following case. What is the value of P' ?

asked Jan 31, 2014 by balaji

1 answer

Hot air balloon is an application of what law?

asked Jan 31, 2014 by balaji

3 answers

Bursting of a soda bottle in summer is an example of ?

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 $y$

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?

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.

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?

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?

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

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?

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?

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 $x$

asked Jan 31, 2014 by thanvigandhi_1

1 answer

The one which is the measure of the central tendency is

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?

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?

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

asked Jan 31, 2014 by thanvigandhi_1

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

asked Jan 31, 2014 by thanvigandhi_1

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

asked Jan 31, 2014 by thanvigandhi_1

1 answer

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