Recent questions tagged class11

The statement: A rectangle is a square if all the 4 sides are equal, in if-then form would be

asked Jan 20, 2014 by thanvigandhi_1

1 answer

What is the negation of: For every real number $x ,x \gt x+2$?

asked Jan 20, 2014 by thanvigandhi_1

1 answer

Supersonic jets cause pollution by thinning of

asked Jan 20, 2014 by sreemathi.v

1 answer

In which of the following statements is the OR inclusive?

asked Jan 20, 2014 by thanvigandhi_1

1 answer

Lichens can serve as pollution

asked Jan 20, 2014 by sreemathi.v

1 answer

In which statement is the OR exclusive?

asked Jan 20, 2014 by thanvigandhi_1

1 answer

Sum of series $\;\sum_{r=1}^{n}\;r\;log\;\frac{r+1}{r}$ is :

asked Jan 20, 2014 by yamini.v

1 answer

If $ t$ and $ c$ denote a tautology and a contradiction respectively, then for any statement $p, p \wedge t$ is equal to

asked Jan 20, 2014 by thanvigandhi_1

1 answer

Caliche is used in manufacture of

asked Jan 20, 2014 by sreemathi.v

1 answer

If p : Nidhi is a girl and q : Anurag is a boy, then the statement: Nidhi is a girl and Anurag is a boy, is written in symbols as

asked Jan 20, 2014 by thanvigandhi_1

1 answer

What is the negation of: Ram is in class X or Rashmi is in class XII?

asked Jan 20, 2014 by thanvigandhi_1

1 answer

Laughing gas is also known as

asked Jan 20, 2014 by sreemathi.v

1 answer

"If Deb and Sam go to the mall, then it is snowing." Which statement below is logically equivalent?

asked Jan 20, 2014 by thanvigandhi_1

1 answer

If $a_{1},a_{2},...a_{n}$ are in HP. , Then $\;a_{1}a_{2}+a_{2}a_{3}+.....+a_{n}\;a_{n-1}$ is equal to

asked Jan 20, 2014 by yamini.v

1 answer

Carbogen is a mixture of

asked Jan 20, 2014 by sreemathi.v

1 answer

If Susan does not like spinach, what is the truth value of the statement "Susan likes ice cream and she like spinach."?

asked Jan 20, 2014 by thanvigandhi_1

1 answer

The sentence "____ if and only if $ x + x = 3x$" is TRUE. Which of the following could be used to fill in the blank?

asked Jan 20, 2014 by thanvigandhi_1

1 answer

The sentence "____ if and only if $ x + x = 3x$" is TRUE. Which of the following could be used to fill in the blank?

asked Jan 20, 2014 by thanvigandhi_1

1 answer

Carbon molecules having $C60$ formulae are known as

asked Jan 20, 2014 by sreemathi.v

1 answer

What is the nature of classical smog?

asked Jan 20, 2014 by sreemathi.v

1 answer

Sum of $n$ terms of series $S$ = $1$ + $2 \;(1+\frac{1}{n})$ + $3(1+\frac{1}{n})^2$ + ....is given by

asked Jan 20, 2014 by yamini.v

1 answer

What is the relative contribution of $CO_2$ to green house effect

asked Jan 20, 2014 by sreemathi.v

1 answer

In the absence of green house effect what would be the mean temperature of earth?

asked Jan 20, 2014 by sreemathi.v

1 answer

The beauty of Tajmahal is getting destroyed due to

asked Jan 20, 2014 by sreemathi.v

2 answers

For $0\;<\;x\;<\;\pi$, the values of x which satisfies $1+|cos\;x|+|cos\;x|^2+|cos\;x|^3+$....$\infty$ = $2^4$ are

asked Jan 20, 2014 by yamini.v

1 answer

The level of CO gas in air that causes immediate death is

asked Jan 20, 2014 by sreemathi.v

1 answer

If $f\;(x)$ is a two degree polynomial such that $f\;(3)=f\;(-3)$ and $a, b, c$ are in $AP$, then $f'(a)$, $f'(b)$ and $f'(c)$ are in

asked Jan 20, 2014 by yamini.v

1 answer

Which of the following is primary pollutant?

asked Jan 20, 2014 by sreemathi.v

1 answer

If $\frac{1}{1^2}+\frac{1}{2^2}+\frac{1}{3^2}+$......upto $\infty$ = $\frac{\phi^2}{g}$, then $\frac{1}{1^2}+\frac{1}{3^2}+\frac{1}{5^2}+$.....upto $\infty$ will be

asked Jan 20, 2014 by yamini.v

1 answer

Acid rain contains

asked Jan 20, 2014 by sreemathi.v

1 answer

PH of acid rain may be

asked Jan 20, 2014 by sreemathi.v

1 answer

Global warming can be prevented by

asked Jan 20, 2014 by sreemathi.v

1 answer

The most abundant hydrogen pollutant is

asked Jan 20, 2014 by sreemathi.v

1 answer

Solid component of the earth consisting of soil,rocks and mountains is called

asked Jan 20, 2014 by sreemathi.v

1 answer

The region which is greatly affected by air pollution is

asked Jan 20, 2014 by sreemathi.v

1 answer

If $S_{n}=\frac{1}{6}\;n\;(2n^2+9n+13)\;$, then $\sum_{r=1}^n\;\sqrt{a_{r}}\;$ equals.

asked Jan 20, 2014 by yamini.v

1 answer

The greatest affinity for haemoglobin is shown by

asked Jan 20, 2014 by sreemathi.v

1 answer

Ozone layer is present in

asked Jan 20, 2014 by sreemathi.v

1 answer

Sum of series $\;\frac{1}{2}+\frac{3}{4}+\frac{7}{8}+\frac{15}{16}+.....\;is:$

asked Jan 20, 2014 by yamini.v

1 answer

The study of toxicity of organo metallic compound is termed as

asked Jan 20, 2014 by sreemathi.v

1 answer

COD is measure of

asked Jan 20, 2014 by sreemathi.v

1 answer

Chemical oxygen is determined by using

asked Jan 20, 2014 by sreemathi.v

1 answer

If $f\;(xy)=f\;(x+y)\;\forall\;x,y\;\in\;R$ and $\;f\;(2009)=2009$, then $f\;(-2009)$ equals

asked Jan 20, 2014 by yamini.v

1 answer

Sum of n terms of series $\;\frac{1}{1^3}\;+\frac{1+2}{1^3+2^3}\;+\frac{1+2+3}{1^3+2^3+3^3}\;+....\;is$

asked Jan 20, 2014 by yamini.v

1 answer

The amount of oxygen required for healthy growth of plants and animals in water is

asked Jan 20, 2014 by sreemathi.v

1 answer

Among the following which is contaminant

asked Jan 20, 2014 by sreemathi.v

1 answer

If x, y, z > 1 are in GP, then $\frac{1}{1+lnx}$, $\frac{1}{lny}$, $\frac{1}{lnz}$ are in

asked Jan 20, 2014 by yamini.v

1 answer

A good quality of water will have

asked Jan 20, 2014 by sreemathi.v

1 answer

Which of the following can act as sink for $CO_2$ and $SO_2$

asked Jan 20, 2014 by sreemathi.v

1 answer

If in an AP , $\;m^{th}$ term is $\;\frac{1}{n}$ and $\;n^{th}\;term\;is\frac{1}{m}$ , then $\;mn^{th}$ term is :

asked Jan 20, 2014 by yamini.v

1 answer

Ask Questions, Get Answers