Recent questions tagged class11

If $l,m,n$ are $\;x^{th}\;,y^{th}\;and\;z^{th}$ term of a GP then , $\begin{vmatrix}\log l& x & 1\\\log m &y &1\\\log n &z &1\end{vmatrix}=$

asked Jan 21, 2014 by yamini.v

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Increase in concentration of pollutant by the process of food chains is called

asked Jan 21, 2014 by sreemathi.v

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The disease caused due to excess of fluoride

asked Jan 21, 2014 by sreemathi.v

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If first and last term of an AP are $a$ & $l$ and sum of all terms is $s$, then common difference is

asked Jan 21, 2014 by yamini.v

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Which of the following is used as Bioremedies

asked Jan 21, 2014 by sreemathi.v

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Sum of $n$ terms of AP is $6n^2+5n$ while $a_{m}=164$, the value of $m$ is

asked Jan 21, 2014 by yamini.v

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The suspected carcinogenic water pollutant is

asked Jan 21, 2014 by sreemathi.v

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The density of air is maximum in

asked Jan 21, 2014 by sreemathi.v

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Let $S=\frac{3}{19}+\frac{33}{(19)^2}+\frac{333}{(19)^3}+$......$\infty$. Find $S$.

asked Jan 21, 2014 by yamini.v

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Which of the following is not a primary pollutant

asked Jan 21, 2014 by sreemathi.v

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Harmonic mean of roots of equation $(5+\sqrt{2})\;x^2$ - $(4+\sqrt{2})\;x$ + $8$ + $2\;\sqrt{2}$ will be

asked Jan 21, 2014 by yamini.v

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Which is not responsible for environment pollution

asked Jan 21, 2014 by sreemathi.v

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Th type of bond formed by CO with haemoglobin in blood is

asked Jan 21, 2014 by sreemathi.v

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Natural numbers are divided into groups $\;(1)\;,\;(2,3,4)\;,\;(5,6,7,8,9)\;.....$ Sum of first and last term of $n^{th}\;$ group will be :

asked Jan 21, 2014 by yamini.v

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The smog is essentially caused by presence of

asked Jan 21, 2014 by sreemathi.v

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If in an AP $m$ times $\;m^{th}\;$ term equals $n$ times $\;n^{th}$ term , then $\;(m+n)^{th}$ term will be

asked Jan 21, 2014 by yamini.v

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Herbicides are

asked Jan 21, 2014 by sreemathi.v

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Nerve toxins are

asked Jan 21, 2014 by sreemathi.v

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Let $a_{n}\;$ be $\;n^{th}$ term of AP. If $\;\displaystyle\sum_{r=1}^{50}\;a_{2r}=p\;and \;\displaystyle\sum_{r=1}^{50}\;a_{2r-1}=q\;$ the common difference is :

asked Jan 21, 2014 by yamini.v

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Green house gases radiate back the following radiations to the earth surface

asked Jan 21, 2014 by sreemathi.v

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Which of the following is not the effect of acid rain

asked Jan 21, 2014 by sreemathi.v

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A high or good quality water will have

asked Jan 21, 2014 by sreemathi.v

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Due to fluorosis disease

asked Jan 21, 2014 by sreemathi.v

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Which of the following can be removed by ion exchange method

asked Jan 21, 2014 by sreemathi.v

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What is the converse of the statement: n is divisible by 3, if the sum of digits of n is divisible by 3?

asked Jan 20, 2014 by thanvigandhi_1

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What is the contrapositive of the statement: If $f(2)=0$, then $ f(x)$ is divisible by $(x-2)$?

asked Jan 20, 2014 by thanvigandhi_1

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What is the converse of the statement: If $x-4 = 5$, then $x=9$?

asked Jan 20, 2014 by thanvigandhi_1

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What is the contradiction of the statement: In $ \Delta ABC,\: if\: AB=AC$, then angles $C=B$?

asked Jan 20, 2014 by thanvigandhi_1

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What is the negation of the statement, Rashmi is tall, and therefore, she is slim?

asked Jan 20, 2014 by thanvigandhi_1

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What is the negation of the statement, If it rains, the humidity increases?

asked Jan 20, 2014 by thanvigandhi_1

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Indicate the Premise2 in the following Premise1: All integers less than zero are negativenumbers. Conclusion : y is a negative number.

asked Jan 20, 2014 by thanvigandhi_1

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Which is a false statement?

asked Jan 20, 2014 by thanvigandhi_1

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Which of the following is a true statement?

asked Jan 20, 2014 by thanvigandhi_1

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Which counter example cannot be used to show that the statement, if n is an odd integer then n is prime is false?

asked Jan 20, 2014 by thanvigandhi_1

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Which of the following statements do not convey the same meaning as, If a natural number is even then its square is also even?

asked Jan 20, 2014 by thanvigandhi_1

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If $\;x=\sqrt{2+\sqrt{2+\sqrt{2+------\;\infty}}}\;and\;y=\sqrt{2\;\sqrt{2\;\sqrt{2\;\sqrt{2\;----\;\infty}}}}$ then $xy$ equals

asked Jan 20, 2014 by yamini.v

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Which of the following statements do not convey the same meaning as, If a triangle is equiangular then it is an obtuse angled triangle.?

asked Jan 20, 2014 by thanvigandhi_1

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Sum of series $\;S=\frac{1}{2\sqrt{1}+1\sqrt{2}}+\frac{1}{3\sqrt{2}+2\sqrt{3}}+\;....\;+\frac{1}{100\sqrt{99}+99\sqrt{100}} \;is$

asked Jan 20, 2014 by yamini.v

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Identify the contrapositive of the statement, If 2 is the only even prime number then 6 is divisible by 3.

asked Jan 20, 2014 by thanvigandhi_1

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Identify the contrapositive of the statement, If 2 lines are intersecting then they are not parallel.

asked Jan 20, 2014 by thanvigandhi_1

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Identify the converse of the statement: If x is a prime number then x is even.

asked Jan 20, 2014 by thanvigandhi_1

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Identify the converse of the statement: If a parallelogram is a square then it is a rhombus?

asked Jan 20, 2014 by thanvigandhi_1

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Which statement represents the inverse of the statement "If it is snowing, then Skeeter wears a sweater."?

asked Jan 20, 2014 by thanvigandhi_1

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If BOD of river is high

asked Jan 20, 2014 by sreemathi.v

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If $1^4+2^4+3^4+.....n^4$ = $an^5+bn^4+cn^3+dn^2+en+f$, find $a$

asked Jan 20, 2014 by yamini.v

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What happens when chlorides are heated with $NH_4Cl$

asked Jan 20, 2014 by sreemathi.v

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The statement: 5 divides 20 if 5 divides -20, in if-then form would be

asked Jan 20, 2014 by thanvigandhi_1

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Sum of series $(n)(n)$ + $(n-1)(n+1)$ + $(n-2)(n+2)$ +....+ $1\;(2n-1)$ is

asked Jan 20, 2014 by yamini.v

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The statement: 24 is divisible by 6 if 25 is a multiple of 5, in if-then form would be

asked Jan 20, 2014 by thanvigandhi_1

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Cracking of rubber is due to

asked Jan 20, 2014 by sreemathi.v

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