Recent questions in JEEMAIN-2014

The first conization potential of four consecutive elements, present in the second period of the periodic table are $8.3,11.3,14.5$ and $13.6\;ev$ respectively. Which one of the following is the first conization potential (in ev) of nitrogen ?

asked Apr 7, 2015 by meena.p

1 answer

The maximum oxidation states shown by $Ru$ and $Os$ , respectively are :

asked Apr 7, 2015 by meena.p

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An aromatic molecule will :

asked Apr 7, 2015 by meena.p

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Two solutions of a substance are mixed in the following manner. $480 \;ml $ of $1.5\;M$ First solution +$520\;ml\;of\;1.2 M$ second solution . What is the molarity of the final mixture?

asked Apr 7, 2015 by meena.p

1 answer

The bonds present in $N_2O_5$ are

asked Apr 7, 2015 by meena.p

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Element X is strong electropositive and element Y is strongly electro negative. Both are univalint . The compound formed formed will be

asked Apr 7, 2015 by meena.p

1 answer

The chemical formula of feldspar is

asked Apr 7, 2015 by meena.p

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The correct order of stability for the following super oxides is

asked Apr 7, 2015 by meena.p

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An isomer of ethanol is

asked Apr 7, 2015 by meena.p

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The number of isomers of $C_6H_{14}$ is

asked Apr 7, 2015 by meena.p

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The de Broglie wavelengths of electron waves in $3:5$ . The ratio of kinetic energy of electrons will be

asked Apr 7, 2015 by meena.p

1 answer

The orbital angular momentum of an electron in 2s orbital is

asked Apr 7, 2015 by meena.p

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The number of radial nodes of 3s and 2 p orbitals are respectively.

asked Apr 7, 2015 by meena.p

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The ratio of radii of first three orbits in hydrogen atom is

asked Apr 6, 2015 by meena.p

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The radius of Bohr's first orbit is $Li^{2t}$ is

asked Apr 6, 2015 by meena.p

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For the vaporization process of HI, the molar entropy and molar enthalpy are respectively $89.0\;jk^{-1}$ and $21.16\;kj\;mol^{-1}$. The temperature at which the value of $\delta G$ becomes zero for this process is

asked Apr 6, 2015 by meena.p

1 answer

The values of four quantum number of valence electron of an element $n=4,l=0,m=0$ and $s= \large\frac{+1}{2}$. The element is

asked Apr 6, 2015 by meena.p

1 answer

The correct order of $ \angle FMF$ bond angles in $NSF_3,SiF_4$ and $PoF_3$ is

asked Apr 6, 2015 by meena.p

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For an irreversible reaction $A \to 2B$ , the rate is increased by four times when the concentration of A is doubled. The incorrect statement about this reaction is

asked Apr 6, 2015 by meena.p

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The point $(0,5) $ is closet to the curve $x^2=2y$ at

asked Mar 23, 2015 by meena.p

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A line passes through Point $(2,2) $ and is perpendicular to the line $3x+y=3$, then its y -intercept is

asked Mar 23, 2015 by meena.p

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The value of $ (-1+\sqrt {-3})^{62} $$+(-1- \sqrt {-3})^{62}$

asked Mar 16, 2015 by meena.p

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The inverse of the function $f(x) =\large\frax{(ax-b)}{(cx-a)}$$ x \neq \large\frac{a}{c}$ is equal to

asked Mar 16, 2015 by meena.p

1 answer

If $z= \large\frac{1}{z}$$=1 $ and z be any complex number, then the value of $z^{99} +\frac{1}{z^{99}}$ is

asked Mar 16, 2015 by meena.p

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If the lines $Y=x+1, 2x -3y+5 =0$ and $3x-y+m=0$ are concurrent , then the value of m is

asked Mar 16, 2015 by meena.p

1 answer

From $0 < a < x$ , the minimum value of the function $y= \log _a x + \log _a a$ is

asked Mar 16, 2015 by meena.p

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The vertex of the parabola $y= x^2-8x+c$ will be a point on the x-axis , if the value of c is

asked Mar 16, 2015 by meena.p

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$\lim \limits_ {n \to \infty} \bigg[ \large\frac{1}{1+n^3}+ \frac{4}{8+n^3}+.......+\frac{r^2}{(r^2+n^3)}+....+\frac{1}{(2n)}\bigg]$=

asked Mar 16, 2015 by meena.p

1 answer

The value of m for which the scalsr product of the vector $(\overrightarrow{i}+\overrightarrow{j}+\overrightarrow{k}$ with the unit vector parallel to the sum of the vector $2\overrightarrow{i} + 4\overrightarrow{j}+5 \overrightarrow{k})$ and $ (m\overrightarrow{i}+2 \overrightarrow{j}+3 \overrightarrow{k})$ ie 1 is equal to

asked Mar 16, 2015 by meena.p

1 answer

The coefficient of x in the quadratic equation $ax^2+bx+c=0$ was wrongly taken as 17 in place of 13, and its roots were found to be $-2$ and $-15$ , the actual roots of the equation are

asked Mar 16, 2015 by meena.p

1 answer

If the equations $ax^2+bx+c=0$ and $x^2+x+1=0$ have a common root, then

asked Mar 16, 2015 by meena.p

1 answer

If $x,y,z$ are three positive real numbers then value of $(x+y) (y+z) (z+x) $ is

asked Mar 16, 2015 by meena.p

0 answers

Six points in a plane be joined in all possible ways by indefinite straight lines, and if no two of them be coincident or parallel, and no three passs through the same point. (with the expectation of the original 6). The number of distinct points of intersection is equal to

asked Mar 13, 2015 by meena.p

1 answer

The quartile deviation of the items $7,10,12,15,17,17,25$

asked Mar 13, 2015 by meena.p

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If $x^2-3x+2$ is a factor of $x^4-px^2+q=0$ then $P,q$ are

asked Mar 13, 2015 by meena.p

1 answer

Coefficient of correlation is

asked Mar 12, 2015 by meena.p

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Coefficient of $x^4$ in the expression of $ \large\frac{1-3x+x^2}{e^x} $ is

asked Mar 12, 2015 by meena.p

1 answer

Coefficient of $x^4$ in the expression of $\large\frac{1-3x+x^2}{e^x}$ is

asked Mar 12, 2015 by meena.p

1 answer

If the pair of straight line $x^2-2pxy-y^2=0$ and $x^2-2qxy-y^2=0$ be such that each pair bisects the angle between the other , then the correct relationship is

asked Mar 12, 2015 by meena.p

1 answer

The equation of the normal to the curve $y=x^3-x^2$ at the point $(1,1)$ lying on it is

asked Mar 12, 2015 by meena.p

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The equation of the normal to the curve $y=x^3-x^2$ at the point $(1,1)$ lying on it is

asked Mar 12, 2015 by meena.p

1 answer

If the roots of equation $x^3-12x^2+39x-28=0$ are in A.P, then common difference will be

asked Mar 12, 2015 by meena.p

1 answer

If $y= x -\large\frac{x^2}{2}+\frac{x^3}{3}-\frac{x^4}{4} +......$, then x is

asked Mar 12, 2015 by meena.p

1 answer

from the top of a h meter high cliff , the angles of depression of the top and the bottom of a tower are observed to be $30^{\circ}$ and $60^{\circ}$ respectively . the height of the tower is

asked Mar 12, 2015 by meena.p

1 answer

The least value of $3 \sin x - 4 \cos x++17 $ is

asked Mar 12, 2015 by meena.p

0 answers

The least value of $3 \sin x - 4 \cos x++17 $ is

asked Mar 12, 2015 by meena.p

1 answer

The largest value of $2x^2 - 3x^2-12 x +5$ for $-2 \geq x \geq 4$ occurs at x equal to

asked Mar 12, 2015 by meena.p

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If $y= \tan ^{-1} (\sec x +\tan x)$ then $\large\frac{dy}{dx} $ is

asked Mar 12, 2015 by meena.p

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The value of $\sec A (\cos B cosec C - \sin B \sin C)$ Where $A+B+C= \pi$

asked Mar 12, 2015 by meena.p

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If X and Y are two sets, then $ X \cap (Y \cup X)$ equal

asked Mar 12, 2015 by meena.p

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