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Recent questions tagged class11

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

asked Jan 31, 2014 by thanvigandhi_1

1 answer

Median of $ ^{2n}C_0, ^{2n}C_1, ^{2n}C_2, ^{2n}C_3...... ^{2n}C_n$ ( where n is even ) is

asked Jan 31, 2014 by thanvigandhi_1

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 $i=1$

asked Jan 31, 2014 by thanvigandhi_1

1 answer

The standard deviation of the numbers 31, 32, 33, 46, 47 is

asked Jan 31, 2014 by thanvigandhi_1

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

asked Jan 31, 2014 by thanvigandhi_1

1 answer

Atomic radius is of the order of $10^{-8} cm$ and nuclear radius is of the order of $10^{-13}$ cm. calculate what fraction of atom is occupied by nucleus?

asked Jan 31, 2014 by sharmaaparna1

1 answer

Find out the energy of H atom in first excitation state. The value of permitivity factor $4\pi E_{\large\circ} = 1.11264\times10^{-10} C^2N^{-1}m{-2}$

asked Jan 31, 2014 by sharmaaparna1

1 answer

What is the principal quantum no. of H-atom Orbital if the electron energy is -3.4 eV ? also report the angular momentum of electron

asked Jan 31, 2014 by sharmaaparna1

1 answer

What hydrogen like ion has the wavelength difference between the first lines of Balmer and Lyman series equal to 59.3 nm? $R_H = 109678 cm^{-1}$

asked Jan 31, 2014 by sharmaaparna1

1 answer

If the mean of $n$ observation $ 1^2, 2^2, 3^2.....n^2$ is $ \large\frac{46n}{11}$ then $n$ is equal to

asked Jan 30, 2014 by thanvigandhi_1

1 answer

The photo electric emission requires a threshold frequency $V_o$. For a certain metal $\lambda_1$ = 2200 $\overset{\circ}{A}$ and $\lambda_2$ = 1900 $\overset{\circ}{A}$ produce electrons with a maximum kinetic energy $KE_1$ and $KE_2$. If $KE_2 = 2KE_1$. Calculate $V_o$ and corresponding $\lambda_o$.

asked Jan 30, 2014 by sharmaaparna1

1 answer

Calculate the largest wavelength which can remove the electron from 1 Bohr's orbit. Given $E_1$ = 13.6 eV

asked Jan 30, 2014 by sharmaaparna1

1 answer

The variance of $n$ natural number is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

If you flip a fair coin 19 times, what is the probability that you will end up with an even number of heads?

asked Jan 29, 2014 by balaji

1 answer

The correlation coefficient of two variables $x$ and $y$ is 0.8. The regression coefficient of $y$ on $x$ is 0.2 then the regression coefficient of $x$ and $y$ is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The correlation coefficient between $x$ and $y$ is from the following data is \[\] $ \Sigma x = 40\: \: \Sigma y=50\: \: \Sigma xy = 220\: \: \Sigma x^2=200\: \: \Sigma y^2 = 262\: \: n=10$

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The geometric mean of $ 2.262.....2^n$ is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The sum of absolute deviation about median is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The coefficient of correlation $r$ is independent of

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The variance of 6, 8, 10, 12, 14 is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

If $b_{yx}=1.6$ and $b_{xy}=0.4$ and the angle between two regression lines is $ \theta$ then $ \tan \theta$ is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

If 25% of item are less than 10 and 25% are more than 40, then coefficient of quartile deviation is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

If the coefficient of variation of a distribution is 45% and the mean is 12 then its standard deviation is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The average marks of boys in a class is 52 and that of girls is 42. The average marks of boys and girls combined is 50. The percentage of boys in the class is

asked Jan 29, 2014 by thanvigandhi_1

1 answer

The mean of the numbers $ a, b, 8, 5, 10$ is $6$ and the variance is $6.80$. Then which one of the following gives possible values of $a$ and $b$ ?

asked Jan 29, 2014 by thanvigandhi_1

1 answer

If the mean deviation of the numbers $ 1, 1+d, 1+2d......1+100d$ from their mean is $255$, then the $d$ is equal to

asked Jan 29, 2014 by thanvigandhi_1

1 answer

Calcium oxide can be used for drying of

asked Jan 29, 2014 by sreemathi.v

1 answer

The thermal stability of $BaCO_3,CaCO_3$ and $MgCO_3$ is

asked Jan 29, 2014 by sreemathi.v

1 answer

Metals used in flash photography is

asked Jan 29, 2014 by sreemathi.v

1 answer

Gypsum is not chemically similar to

asked Jan 29, 2014 by sreemathi.v

1 answer

Alkaline earth metal(s) which does(do) not impact colour to the flame is(are)

asked Jan 29, 2014 by sreemathi.v

1 answer

Halides (Cl,Br and I) of alkaline earth metal which cannot be dehydrated by heating is (are)

asked Jan 29, 2014 by sreemathi.v

1 answer

Oxalates of alkaline earth metal(s) sparingly soluble in water (is) are

asked Jan 29, 2014 by sreemathi.v

1 answer

Alkaline earth metal sulphates which crystallises in hydrated form are

asked Jan 29, 2014 by sreemathi.v

1 answer

Slaked lime is obtained when water is added to

asked Jan 29, 2014 by sreemathi.v

1 answer

The compound insoluble in acetic acid is :

asked Jan 29, 2014 by sreemathi.v

1 answer

The pair of amphoteric hydroxides is :

asked Jan 29, 2014 by sreemathi.v

1 answer

For two data sets each of size 5, the variances are given to be 4 and 5 and the corresponding means are given to be 2 and 4 respectively. The variance of the combined data set is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

The standard deviation of -1, -2, -3, -4, -5, -6, -7 is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

The two lines of regression are $ x+2y-5=0$ and $ x+3y-8=0$. The coefficient of correlation between $x$ and $y$ is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

Yellow phosphorous on reaction with $Ca(OH)_2$ gives

asked Jan 28, 2014 by sreemathi.v

1 answer

If $r_1$ and $r_2$ are regression coefficients of $y$ on $x$ and $x$ on $y$ respectively

asked Jan 28, 2014 by thanvigandhi_1

1 answer

Which of the following quantities cannot be zero on an average for the molecules of an ideal gas in equilibrium condition?

asked Jan 28, 2014 by balaji.thirumalai

1 answer

Which of the following is the strongest reducing agent?

asked Jan 28, 2014 by sreemathi.v

1 answer

Which of the following relations hold true for a monatomic gas?

asked Jan 28, 2014 by balaji.thirumalai

1 answer

The specific heat of a gas:

asked Jan 28, 2014 by balaji.thirumalai

1 answer

The most active metal is

asked Jan 28, 2014 by sreemathi.v

1 answer

The coefficient of correlation between $x$ and $y$ is $0.5$ and their covariance is $16$ and SD of $x$ is $4$ then SD of $y$ is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

Portland cement does not contain :

asked Jan 28, 2014 by sreemathi.v

1 answer

Keeping the volume constant and increasing the temperature, which of the following will hold true?

asked Jan 28, 2014 by balaji.thirumalai

1 answer

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