Recent questions tagged 2014

Which of these statements is not true ?

asked May 25, 2014 by yamini.v

0 answers

Example of a three - dimensional silicate is :

asked May 25, 2014 by yamini.v

0 answers

Amongst the following , identify the species with an atom in +6 oxidation state :

asked May 25, 2014 by yamini.v

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Which one of the following ores is known as Malachite :

asked May 25, 2014 by yamini.v

1 answer

The major product formed when 1,1,1 - trichloro - propane is treated with aqueous potassium hydroxide is :

asked May 25, 2014 by yamini.v

1 answer

Which one of the following is an example of thermosetting polymers ?

asked May 25, 2014 by yamini.v

0 answers

The final product formed when Methyl amine is treated with $\;NaNO_{2}\;$ and $\;HCl\;$ is :

asked May 25, 2014 by yamini.v

1 answer

Which one following compounds will not be soluble in sodium bicarbonate ?

asked May 25, 2014 by yamini.v

0 answers

Williamson synthesis of ether is an example of :

asked May 25, 2014 by yamini.v

0 answers

The reason for double helical structure of DNA is the operation of :

asked May 25, 2014 by yamini.v

1 answer

Among the following organic acids , the acid present in rancid butter is :

asked May 25, 2014 by yamini.v

2 answers

The total number of octahedral void(s) per atom present in a cubic close packed structure is :

asked May 25, 2014 by yamini.v

1 answer

The observed osmotic pressure for a 0.10 M solution of $\;Fe(NH_{4})_{2}(SO_{4})_{2}\;$ at $\;24^{0}C\;$ is 10.8 atm . The expected and experimental (observed) values of Van't Hoff factor (i) will be respectively : $\;(R=0.082\;L\; atm\; k^{-1} mol^{-1})$

asked May 25, 2014 by yamini.v

0 answers

Sulphur dioxide and oxygen were allowed to diffuse through a porous partition .$\;20\;dm^{3}\;$ of $\;SO_{2}\;$ diffuses through the porous partition in 60 seconds .The volume of $\;O_{2}\;$ in $\;dm^{3}\;$ which diffuses under the similar condition in 30 seconds will be (atomic mass of sulphur =32 u):

asked May 25, 2014 by yamini.v

1 answer

Zirconium phosphate $\;[Zr_{3}(PO_{4})_{4}]\;$ dissociates into three zirconium cations of charge +4 and four phosphate anions of charge -3 . If molar solubility of zirconium phosphate is denoted by S and its solubility product by $\;K_{sp}\;$ then which of the following relationship between $\;S\;$ and $\;K_{sp}\;$ is correct ?

asked May 25, 2014 by yamini.v

1 answer

Which one of the following molecules is paramagnetic ?

asked May 25, 2014 by yamini.v

1 answer

Choose the correct statement with respect to the vapour pressure of a liquid among the following :

asked May 25, 2014 by yamini.v

0 answers

Ionization of energy of gaseous Na atoms is $\;495.5\;kJmol^{-1}\;$.The lowest possible frequency of light that ionizes a sodium atom is $\;(h=6.626 \times 10^{-34}\;Js\;N_{A}=6.022 \times 10^{23}\;mol^{-1})\; $

asked May 25, 2014 by yamini.v

0 answers

If the function $\; f(x) = \{ \begin{array} \large\frac{\sqrt{2+cos x}-1}{(\pi-x)^{2}} ,& x \neq \pi \\ k ,& x=\pi \end{array} \;$ is continuous at $\;x=\pi \;$ , then k equals :

asked May 25, 2014 by yamini.v

0 answers

If m is non - zero number and $\;\int \large\frac{x^{5m-1}+2x^{4m-1}}{(x^{2m}+x^{m}+1)^{3}} \normalsize dx= \normalsize f(x)+c\;$ , then $\;\normalsize f(x)\;$ is :

asked May 25, 2014 by yamini.v

0 answers

The contrapositive of the statement " If i am not feeling well , then i will go to the doctor " is :

asked May 25, 2014 by yamini.v

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The principal value of $\;tan^{-1}(cot \large\frac{43 \pi}{4})\;$ is :

asked May 25, 2014 by yamini.v

0 answers

The function $\;f(x)=|sin 4x|+|cos 2x|\;$ , is a periodic function with period :

asked May 25, 2014 by yamini.v

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Let $\;\overline{x}\;,M\;$ and $\;\sigma^{2}\;$ be respectively the mean ,mode and variance of n observations $\;x_{1},x_{2},...,x_{n}\;$ and $\;d_{i}=-x_{i}-a\;,i=1,2,...,n\;$, where a is any number.\[\] Statement I : Variance of $\;d_{1},d_{2},..,d_{n}\;$ is $\;\sigma^{2}\;$\[\] Statement II :Mean and mode of $\;d_{1},d_{2},..,d_{n}\;$ are $\;\overline{x}-a\;$ and $\;-M-a\;$, respectively

asked May 25, 2014 by yamini.v

0 answers

Let A and E be any two events with positive probabilities :\[\] Statement I : $\;\normalsize P(\large\frac{E}{A}) \geq \normalsize P(\large\frac{A}{E}) \normalsize P(E)\;$ \[\] Statement II : $\;\normalsize P(\large\frac{A}{E}) \geq \normalsize P(A \cap E)\;$ .

asked May 25, 2014 by yamini.v

0 answers

If $\;\overrightarrow{x}=3 \hat{i}-6 \hat{j}-\hat{k}\;, \overrightarrow{y}=\hat{i}+4 \hat{j}-3 \hat{k}\;$ and $\;\overrightarrow{z}=3 \hat{i}-4 \hat{j}-12 \hat{k}\;$ , then the magnitude of the projection of $\;\overrightarrow{x} \times \overrightarrow{y}\;$ on $\;\overrightarrow{z}\;$ is :

asked May 25, 2014 by yamini.v

0 answers

If the angle between the line $\;2(x+1)=y=z+4\;$ and the plane $\;2x-y+\sqrt{\lambda}z+4=0\;$ is $\;\large\frac{\pi}{6}\;$ ,then the value of $\;\lambda\;$ is :

asked May 24, 2014 by yamini.v

0 answers

Equation of the line of the shortest distance between the lines $\;\large\frac{x}{1}=\large\frac{y}{-1}=\large\frac{z}{1}\;$ ans $\;\large\frac{x-1}{0}=\large\frac{y+1}{-2}=\large\frac{z}{i}\;$ is :

asked May 24, 2014 by yamini.v

0 answers

The tangent at an extremely (in the first quadrant) of latus rectum of the hyperbola $\;\large\frac{x^{2}}{4}-\large\frac{y^{2}}{5}=0\;$ , meets x -axis and y -axis at A and B respectively .Then $\;(OA)^{2}-(OB)^{2}\;$ , where O is the origin , equals :

asked May 24, 2014 by yamini.v

0 answers

A chord is drawn through the focus of the parabola $\;y^{2}=6x\;$ such that its distance from the vertex of this parabola is $\;\large\frac{\sqrt{5}}{2}\;$ , then its slope can be :

asked May 24, 2014 by yamini.v

0 answers

The equation of the circle described on the chord $\;3x+y+5=0\;$ of the circle $\;x^{2}+y^{2}=16\;$ as diameter is :

asked May 24, 2014 by yamini.v

0 answers

If a line L is perpendicular to the line $\;5x-y=1\;$ , and the area of the triangle formed by the line L and the coordinate axes is 5 , then the distance of line L from the line $\;x+5y=0\;$ is :

asked May 24, 2014 by yamini.v

0 answers

The circumcentre of a triangle lies at the origin and its centroid is the mid point of the line segment joining the points $\;(a^{2}+1,a^{2}+1)\;$ and $\;(2a ,-2a)\;, a \neq 0\;$.Then for any a , the orthocentre of this triangle lies on the line :

asked May 24, 2014 by yamini.v

0 answers

If $\;\large\frac{dy}{dx} + y tan x=sin 2x\;$ and $\;y(0)=1\;$ , then $\;y(\pi)\;$ is equal to :

asked May 24, 2014 by yamini.v

0 answers

The area of the region above the x - axis bounded by the curve $\;y=tan x\;,0 \leq x \leq \large\frac{\pi}{2}\;$ and the tangent to the curve at $\;x= \large\frac{\pi}{4}\;$ is :

asked May 24, 2014 by yamini.v

0 answers

Let function F be defined as $\;F(x) =\int \limits_{1}^{x} \large\frac{e^{t}}{t} dt\;$ , x > 0 then the value of the integral $\;\int \limits_{1}^{x} \large\frac{e^{t}}{t+a} dt\;$ , where a > 0 , is :

asked May 24, 2014 by yamini.v

0 answers

If the volume of a spherical ball is increasing at the rate of $\;4 \pi \;cc/sec\;$ , then the rate of increase of its radius (in cm/sec) , when the volume is $\;288 \pi\;cc\;$ , is :

asked May 24, 2014 by yamini.v

0 answers

If non - zero real numbers b and c are such that min f(x) > max g(x) , where $\;f(x)=x^{2}+2bx+2c^{2}\;$ and $\;g(x)=-x^{2}-2cx+b^{2}\;(x \in R)\;$ ;then $\;|\large\frac{c}{b}|\;$ lies in the interval :

asked May 24, 2014 by yamini.v

0 answers

Let $\;f: R \to R\;$ be a function such that $\;|f(x)| \leq x^{2}\;$ , for all $\;x \in R\;$.Then , at x= 0 , f is :

asked May 24, 2014 by yamini.v

0 answers

Let $\;f(n)=[\large\frac{1}{3} + \large\frac{3n}{100}]n\;$ , where [n] denotes the greatest integer less than or equal to n .Then $\;\sum_{n=1}^{56} f(n)\;$ is equal to :

asked May 24, 2014 by yamini.v

0 answers

The number of terms in an A.P. is even ; the sum of the odd terms in it is 24 and that the even terms is 30 . If the last term exceeds the first term by $\;10 \large\frac{1}{2}\;$, then the number of terms in the A.P. is :

asked May 24, 2014 by yamini.v

1 answer

The coefficient of $\;x^{1012}\;$ in the expansion of $\;(1+x^{n}+x^{253})^{10}\;$,(where $\;n \leq 22\;$ is any positive integer),is :

asked May 24, 2014 by yamini.v

0 answers

Two women and some men participated in a chess tournament in which every participant played two games with each of the other participants .If the number of games that the men played between them - selves exceeds the number of games that the men played with the women by 66 , then the number of men who participated in the tournament lies in the interval :

asked May 24, 2014 by yamini.v

1 answer

If $\;\bigtriangleup_{r}=\begin{vmatrix} r & 2r-1 & 3r-2 \\[0.3em] \large\frac{n}{2} & n-1 & a \\[0.3em] \large\frac{1}{2}n(n-\normalsize 1) & (n-\normalsize 1)^{2} & \large\frac{1}{2} (n-\normalsize 1)(\normalsize 3n-\normalsize 4)\end{vmatrix}\;$ , then the value of $\;\sum_{r=1}^{n-1} \bigtriangleup_{r}\;$ :

asked May 24, 2014 by yamini.v

0 answers

Let A and B be any $\;3 \times 3\;$ matrices . If A is symmetric and B is skewsymmetric , then the matrix AB - BA is :

asked May 24, 2014 by yamini.v

0 answers

The equation $\;\sqrt{3x^{2}+x5}=x-3\;$ , where x is real , has :

asked May 24, 2014 by yamini.v

0 answers

For all complex numbers z of the form $\;1+i \alpha\;, \alpha \in R\;$ , if $\;z^{2}=x+iy\;$ , then :

asked May 24, 2014 by yamini.v

1 answer

Let $\;f: R \to R \;$ be defined by $\;f(x) = \large\frac{|x|-1}{|x|+1}\;$ then f is :

asked May 24, 2014 by yamini.v

0 answers

Interference pattern is absorbed at ' P ' due to superimposition of two rays coming out from a source ' S ' as shown in the figure . The value of ' l ' for which maxima is obtained at ' P ' is : (R is perfect reflecting surface)

asked May 24, 2014 by yamini.v

0 answers

A lamp emits monochromatic green light uniformly in all directions . The lamp is $\;3 \%\;$ efficient in converting electrical power to electromangetic waves and consumes 100 W of power .The amplitude of the electric filed associated with the electromagnetic radiation at a distance of 5 m from the lamp will be nearly :

asked May 24, 2014 by yamini.v

0 answers

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