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Recent questions tagged class11

The outer electronic configuration of radio active element present in 1A group is

asked Jan 27, 2014 by sreemathi.v

1 answer

The no of valance electrons in potassium atom are

asked Jan 27, 2014 by sreemathi.v

1 answer

Most widely occuring alkali metal is

asked Jan 27, 2014 by sreemathi.v

1 answer

The alkali metal atom that easily form cation is

asked Jan 27, 2014 by sreemathi.v

1 answer

The hardest alkali metal is

asked Jan 27, 2014 by sreemathi.v

1 answer

Natron is a mineral whose formula represented

asked Jan 27, 2014 by sreemathi.v

1 answer

What is the volume strength of molar solution of hydrogen peroxide

asked Jan 27, 2014 by sreemathi.v

1 answer

$2NaOD$ is also known as

asked Jan 27, 2014 by sreemathi.v

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$2Na+2D_2O\rightarrow x+D_2$.The $x$ is

asked Jan 27, 2014 by sreemathi.v

1 answer

$2D_2O\quad\underrightarrow{\text{Electrolysis}}\quad A+B$. $A+B$ are

asked Jan 27, 2014 by sreemathi.v

1 answer

If in a frequency distribution, the mean and median are 21 and 22 respectively, then its mode is approximately

asked Jan 26, 2014 by thanvigandhi_1

1 answer

In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72 then what is the average of the girls ?

asked Jan 26, 2014 by thanvigandhi_1

1 answer

If variance of $ x_1, x_2,....x_n$ is $ \sigma^2$ then variance of $ ax_1, ax_2,.....ax_n ( a \neq 0)$ is

asked Jan 26, 2014 by thanvigandhi_1

1 answer

The quartile deviation for the data : \[\] x : 2 3 4 5 6 \[\] f : 3 4 8 4 1

asked Jan 26, 2014 by thanvigandhi_1

1 answer

The quartile deviation of daily wages ( in Rs) of 7 person is 12, 7, 15, 10, 17, 17, 25 is

asked Jan 26, 2014 by thanvigandhi_1

1 answer

The mean age of a combined group of men and women is 30 years. If the mean of the age of men and women are respectively 32 and 27, then the percentage of women in the group is

asked Jan 26, 2014 by thanvigandhi_1

1 answer

A group of 10 items has mean 6. If mean of 4 of these items is 7.5 the mean of remaining items is

asked Jan 26, 2014 by thanvigandhi_1

1 answer

The mean of a set of observation is $ \overline x$. If each observation is divided by $ a, a \neq 0$ and then is increased by 10, then mean of the new set is

asked Jan 26, 2014 by thanvigandhi_1

1 answer

The A.M of $n$ observation is $ \overline x$ . If the sum of $ n-5$ observations is $a$, then the mean of remaining 5 observation is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The weighted A.M of first $n$ natural numbers whose weights are equal is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The A.M of set of 50 numbers is 48. If two numbers 52 and 44 are discarded then A.M of the remaining set of numbers is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The S.D of first $n$ naturals is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

Geometric mean of $ 1, 2, 2^2, 2^3.....2^n$ is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

Mode of the data : \[\] 5, 7, 2, 7, 7, 4, 7, 7, 6, 7 is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

Median of 16, 10, 14, 11, 9, 8, 12, 6, 5 is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

If mode of a data is 27 and mean is 24, then median is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

Mean of 100 items is 49. It was discovered that 3 items 60, 70, 80 were wrongly read as 38,22,50 respectively. The correct mean is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

A car owner buys petrol at Rs. 7.50 Rs. 8.00 and Rs. 8.50 per litre for the 3 successive years. If he spends Rs. 4000 each year, then the average cost per litre of petrol is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The weighted mean of first $n$ natural numbers whose weights are equal to the squares of the corresponding numbers is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

If the mean of the set of numbers $ x_1, x_2.....x_n$ is $ \overline x$ then mean of the numbers $ x_i+2i \: \: 1 \leq i \leq n $ is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The average salary of male employees in a factory was Rs. 520 and that of females was Rs. 420. If mean salary of all employees is Rs. 500, the % of male employees is?

asked Jan 25, 2014 by thanvigandhi_1

1 answer

If a student gets marks : English 80, Hindi 70, Mathematics 85, Physics 75 and Chemistry 67 and the weights of subjects are 1,2,1,3,1 respectively then weighted A.M is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The average weight of 25 boys was calculated to be 78.4 kg. It was later discovered that one weight was misread as 69 kg instead of 96 kg. The correct average is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The A.M of 9 items is 15. If one more item is added to this series, the A.M becomes 16. The value of 10th item is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

If A.M of $x_1, x_2....x_n$ is $ \overline x$ then A.M of $ ax_1+b, ax_2+b, ax_3+b...ax_4+b$ is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The A.M of $ nC_0, \: nC_1, nC_2.......nC_n$ is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The A.M of $a, a+d, a+2d.....a+2nd$ is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The A.M of squares of first $n$ natural numbers is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The A.M of first $n$ natural number is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

A batsman scores $ 38, 70, 48, 34, 42, 55, 63, 46, 54 \: and \: 44$ in 10 innings. Find his mean deviation from median.

asked Jan 25, 2014 by thanvigandhi_1

1 answer

Find the median of the data 21, 39, 27, 31, 23, 41, 49, 29.

asked Jan 25, 2014 by thanvigandhi_1

1 answer

Mean of 10 items was found to be 15. On verification it was found that an item 21 was miscopied as 12. Find the correct mean.

asked Jan 25, 2014 by thanvigandhi_1

1 answer

Find the geometric mean of 5 numbers 2, 8, 16, 128, 512

asked Jan 24, 2014 by thanvigandhi_1

1 answer

Find the mean of first $n$ odd natural numbers.

asked Jan 24, 2014 by thanvigandhi_1

1 answer

$^{\sim}(p \Rightarrow q)$ is equivalent to

asked Jan 24, 2014 by thanvigandhi_1

1 answer

Let f : $R \rightarrow R$ be a function defined by $f(x) = min \{ x+1, |x| + 1 \}$. Then which of the following statements is true?

asked Jan 24, 2014 by thanvigandhi_1

1 answer

For which of the sets of a, is the statement, “The difference between the roots of the equation $x^2+ax+1 = $ is less than $ \sqrt 5”$ true?

asked Jan 24, 2014 by thanvigandhi_1

1 answer

Reducing nature of $H_2O_2:H_2O_2\rightarrow x+y+z$. $z$ is

asked Jan 24, 2014 by sreemathi.v

1 answer

$ ^{\sim}(p V q)$ is equivalent to

asked Jan 24, 2014 by thanvigandhi_1

1 answer

Reducing nature of $H_2O_2:H_2O_2\rightarrow x+y+z$.The $x$ and $y$ are

asked Jan 24, 2014 by sreemathi.v

1 answer

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