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Recent questions tagged class12
Questions
A graph between $1/[A]^2$ vs t is plotted below where [A] is conc of [A] at time t and $[A_o]$ is initial conc and k is the rate constant of a $Rx^n$ $nA\rightarrow$ product. What is the order of the $Rx^n$
jeemain
chemistry
chemical-kinetics
order-of-a-reaction
physical-chemistry
class12
ch4
general-characteristics
medium
basics
asked
Dec 12, 2013
by
sreemathi.v
1
answer
Integrate: $\int \limits_0^{z/4} \sin ^4 (2x)dx $
jeemain
math
class12
ch7
integral-calculus
integration-by-subsitution
easy
q8
asked
Dec 12, 2013
by
meena.p
1
answer
For the reaction $aA+bB\rightarrow cC+dD$ the rate of formation of [C] in term of [A] is given by
jeemain
chemistry
chemical-kinetics
physical-chemistry
class12
ch4
rate-of-reaction
general-characteristics
easy
basics
asked
Dec 12, 2013
by
sreemathi.v
1
answer
Integrate :$\int \limits_0^1 \large\frac{1}{\sqrt {x-(z-x)}} $$dx$
jeemain
math
class12
ch7
integral-calculus
definite-integrals-as-limit-of-sum
medium
q7
asked
Dec 12, 2013
by
meena.p
1
answer
Integrate :$\int \limits_3^4 \large\frac{1}{\sqrt {(x-3)(4-x)}} $$dx$
jeemain
math
class12
ch7
integral-calculus
definite-integrals-as-limit-of-sum
difficult
q6
asked
Dec 12, 2013
by
meena.p
1
answer
Integrate : $\int\limits_0^5 \sqrt {\large\frac{x^3}{5-x}}dx$
jeemain
math
class12
ch7
integral-calculus
definite-integrals-as-limit-of-sum
difficult
q5
asked
Dec 12, 2013
by
meena.p
1
answer
Integrate $\int \limits_0^3 \sqrt {\large\frac{x}{3-x}}$$dx$
jeemain
math
class12
ch7
integral-calculus
definite-integrals-as-limit-of-sum
difficult
q4
asked
Dec 12, 2013
by
meena.p
1
answer
Integrate $\int \limits_0^1 x(1-x)^n dx. n \in N$
jeemain
math
class12
ch7
integral-calculus
definite-integrals-as-limit-of-sum
easy
q3
asked
Dec 12, 2013
by
meena.p
1
answer
Integrate: $\int \large\frac{2}{3} \frac{e^x \sqrt {e^x-4}}{e^x+g}$$dt$
jeemain
math
class12
unit9
integral-calculus
definite-integrals-as-limit-of-sum
medium
q2
asked
Dec 12, 2013
by
meena.p
1
answer
Integrate $\int \limits_0^1 x^m (1-x)^n.dx$
jeemain
math
class12
unit9
integral-calculus
integration-by-parts
medium
q1
asked
Dec 11, 2013
by
meena.p
1
answer
If $\overrightarrow a=\hat i+\hat j+p\hat k\:\:and\:\:\overrightarrow b=\hat i+\hat j+\hat k$, then $|\overrightarrow a+\overrightarrow b|=|\overrightarrow a|+|\overrightarrow b|$ holds for ?
jeemain
math
class12
ch10
vector-algebra
easy
addition-of-vectors
q98
asked
Dec 10, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow {\alpha}=(x+4y)\overrightarrow a+(2x+y+1)\overrightarrow b\:\:and\:\:\overrightarrow {\beta}=(y-2x+2)\overrightarrow a+(2x-3y-1)\overrightarrow b$ where $\overrightarrow a\:\:\overrightarrow b$ are non zero non collinear and if $3\overrightarrow {\alpha}=2\overrightarrow {\beta}$, then $(x,y)=?$
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q97
asked
Dec 10, 2013
by
rvidyagovindarajan_1
1
answer
If a person standing at the point $(1,2) $ walks $5$ units towards east, then $3$ units towards north and $\sqrt 2$ units along the direction of $\hat i+\hat j$ and then walks $\sqrt 2 $ unit along the direction $\perp$ to this vector towards the starting point. What is the displacement of the person from origin?
jeemain
math
class12
ch10
vector-algebra
difficult
addition-of-vectors
q96
asked
Dec 9, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a+2\overrightarrow b+3\overrightarrow c=\overrightarrow 0$, then $\overrightarrow a\times\overrightarrow b+\overrightarrow b\times\overrightarrow c+\overrightarrow c\times\overrightarrow a=?$
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q95
asked
Dec 8, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a=2p\hat i+\hat j$ is rotated about an angle of $\theta$ in anti clock wise direction and becomes $(p+1)\hat i+\hat j$
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q94
asked
Dec 8, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow {AB}=3\hat i-2\hat j+2\hat k$ and $\overrightarrow {BC}=-\hat i-2\hat k$ are adjacent sides of a parallelogram, then the angle between the diagonals is ?
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q93
asked
Dec 8, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a\:\:and\:\:\overrightarrow b$ are unit vectors that are inclined at angle $2\theta$ where $0\leq \theta \leq \pi$ and $|\overrightarrow a-\overrightarrow b| < 1$ then $ \theta$ lies in the interval....
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q92
asked
Dec 8, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow b\:\:is\:\: \perp\:\:to \:\:\overrightarrow a+\overrightarrow b\:\:and\:\:\overrightarrow a\:\:is\:\:\perp \:\:to\:\:2\overrightarrow b+\overrightarrow a$ then $|\overrightarrow a|=?$
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q91
asked
Dec 8, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a\:\:and\:\:\overrightarrow b$ are two unit vectors such that $\overrightarrow a+2\overrightarrow b\:\:and\:\:5\overrightarrow a-4\overrightarrow b$ are $\perp$ to each other, then the angle between $\overrightarrow a\:\:and\:\:\overrightarrow b$ is?
jeemain
math
class12
ch10
vector-algebra
easy
addition-of-vectors
q90
asked
Dec 8, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a\:and\:\overrightarrow b$ are two non collinear unit vectors and $\overrightarrow u=\overrightarrow a-(\overrightarrow a.\overrightarrow b)\overrightarrow b\:\:and\:\:\overrightarrow v=\overrightarrow a\times\overrightarrow b$, then $|\overrightarrow v|=?$
jeemain
math
class12
ch10
vector-algebra
difficult
vector-product
q89
asked
Dec 8, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow v=2\hat i+\hat j-\hat k, \:\:and\:\:\overrightarrow w=\hat i+3\hat k\:\:and\:\:\overrightarrow u$ is a unit vector, then the maximum value of $[\overrightarrow u\:\overrightarrow v\:\overrightarrow w]=?$
jeemain
math
class12
ch10
vector-algebra
medium
vector-product
q88
asked
Dec 8, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a,\:\overrightarrow b,\:\overrightarrow c$ are unit vectors, then the maximum value of $|\overrightarrow a-\overrightarrow b|^2+|\overrightarrow b-\overrightarrow c|^2+|\overrightarrow c-\overrightarrow a|^2$ is ?
jeemain
math
class12
ch10
vector-algebra
difficult
addition-of-vectors
q87
asked
Dec 7, 2013
by
rvidyagovindarajan_1
1
answer
If $|\overrightarrow a|=|\overrightarrow c|=1, \:|\overrightarrow b|=4,\:\overrightarrow a\times\overrightarrow b=2\overrightarrow a\times\overrightarrow c\:and\:$ if the angle between $\overrightarrow b\:and\:\:\overrightarrow c$ is $cos^{-1}\large\frac{1}{4}$ then $\overrightarrow b-2\overrightarrow c=?$
jeemain
math
class12
ch10
vector-algebra
medium
vector-product
q86
asked
Dec 7, 2013
by
rvidyagovindarajan_1
1
answer
The number of vectors $\overrightarrow b$ of unit length which are $\perp$ to $\overrightarrow a=\hat i+2\hat j\:\:and\:\:\overrightarrow c=\hat j+2\hat k$ is?
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q85
asked
Dec 7, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a\:\:and\:\:\overrightarrow b$ are two unit vectors, then $\overrightarrow a\times\overrightarrow b$ is also a unit vector if ?
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q84
asked
Dec 7, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a\times\overrightarrow b+\overrightarrow b\times\overrightarrow c+\overrightarrow c\times\overrightarrow a$ and $\overrightarrow a+\overrightarrow b+\overrightarrow c$ are $\perp$ then $\overrightarrow a,\:\overrightarrow b\:\overrightarrow c$ are .....
jeemain
math
class12
ch10
vector-algebra
easy
addition-of-vectors
q83
asked
Dec 7, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a$ is any vector such that $\overrightarrow a\times \hat i+2\overrightarrow a-5\hat k=\overrightarrow 0$, then $\overrightarrow a=?$
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q82
asked
Dec 6, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow d=x(\overrightarrow a \times\overrightarrow b)+y(\overrightarrow b\times\overrightarrow c)+z(\overrightarrow c\times\overrightarrow a)$ and $[\overrightarrow a\:\overrightarrow b\:\overrightarrow c]=\large\frac{1}{8}$, then $x+y+z=?$
jeemain
math
class12
ch10
vector-algebra
difficult
addition-of-vectors
q81
asked
Dec 6, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a=p\hat i+3\hat j+4\hat k\:\:and\:\:\overrightarrow b=\sqrt q\hat i+5\hat k$ are two vectors of same magnitude, then no. of values of $(p,q)$ are?
jeemain
math
class12
ch10
vector-algebra
easy
addition-of-vectors
q80
asked
Dec 6, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a=\hat i+\hat j-\hat k,\:\overrightarrow b=-\hat i+2\hat j+\hat k\:\:and\:\:\overrightarrow c=-\hat i+2\hat j-\hat k$, then a unit vector $\perp$ to $\overrightarrow a+\overrightarrow b$ and $\overrightarrow b+\overrightarrow c$ is ?
jeemain
math
class12
ch10
vector-algebra
easy
addition-of-vectors
q79
asked
Dec 6, 2013
by
rvidyagovindarajan_1
1
answer
A man walks 4 mtrs. towards west and then walks 3 mtrs in the direction of $\large\frac{\pi}{6}\:$ radians east of north. What is the displacement of the man from the starting point?
jeemain
math
class12
ch10
vector-algebra
difficult
vector-product
q78
asked
Dec 5, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a,\:\overrightarrow b,\:\overrightarrow c$ are any three unit vectors such that $\overrightarrow a.\overrightarrow b=\overrightarrow a.\overrightarrow c=0$ and the angle between $\overrightarrow b\:\:and\:\:\overrightarrow c $ is $\large\frac{\pi}{6}$, then $\overrightarrow b\times\overrightarrow c=?$
jeemain
math
class12
ch10
vector-algebra
medium
vector-product
q77
asked
Dec 5, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a,\:\overrightarrow b,\:\overrightarrow c$ are any three vectors such that $\overrightarrow a\times\overrightarrow b=\overrightarrow c\:\:and\:\:\overrightarrow b\times\overrightarrow c=\overrightarrow a$, then the magnitude of $\overrightarrow b$ is?
jeemain
math
class12
ch10
vector-algebra
medium
vector-product
q76
asked
Dec 5, 2013
by
rvidyagovindarajan_1
1
answer
$|\overrightarrow a\times\overrightarrow b|^2= ?$ (which one of the following )
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q75
asked
Dec 3, 2013
by
rvidyagovindarajan_1
1
answer
If vector $\overrightarrow a$ is unit vector and it makes angle $\large\frac{\pi}{4}$ with $\hat k$ and $\overrightarrow a+\hat i+\hat j$ is also a unit vector, then $\overrightarrow a=?$
jeemain
math
class12
ch10
vector-algebra
difficult
addition-of-vectors
q74
asked
Dec 3, 2013
by
rvidyagovindarajan_1
1
answer
If $D\:\:and\:\:E$ are mid points of the side $\overline {AB}\:\:and\:\:\overline {AC}$ of a $\Delta \:ABC$, then $\overrightarrow {BE}+\overrightarrow {DC}=?$
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q73
asked
Dec 3, 2013
by
rvidyagovindarajan_1
1
answer
If sum of two unit vectors is also a unit vector then the magnitude of their difference is ?
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q72
asked
Dec 3, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow {AB}=3\hat i+\hat j-2\hat k,\:and \:\overrightarrow {AC}=-\hat i+3\hat j+4\hat k$ are two sides af the $\Delta ABC$, then the length of the median through $A$ is ?
jeemain
math
class12
ch13
vector-algebra
medium
q71
asked
Dec 1, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a=\hat i+\hat j+\hat k,\:\overrightarrow b=\hat i\:\:and\:\:\overrightarrow c=x\hat i-\hat j+\hat k$, then the value of $x$ for which $\overrightarrow a\:\overrightarrow b\:and\:\overrightarrow c$ are coplanar is ?
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q70
asked
Dec 1, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a,\:\overrightarrow b,\:\overrightarrow c$ are three vectors of magnitude $3,4,5$ respectively. If each vector is $\perp$ to sum of the other two vectors then $|\overrightarrow a+\overrightarrow b+\overrightarrow c|=?$
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q69
asked
Nov 30, 2013
by
rvidyagovindarajan_1
1
answer
If the sum of two unit vectors is a unit vector, then the magnitude of their difference is ?
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q68
asked
Nov 30, 2013
by
rvidyagovindarajan_1
1
answer
If $ |\overrightarrow a+\overrightarrow b|=|\overrightarrow a|$, then the angle between $2\overrightarrow a+\overrightarrow b$ and $\overrightarrow b$ is ?
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q67
asked
Nov 29, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a= x^2\hat i+2\hat j-2\hat k,\:\overrightarrow b=\hat i-\hat j+\hat k\;and\:\overrightarrow c=x^2\hat i+5\hat j-4\hat k$ are three vectors, then the values of $x$ for which the angle between $\overrightarrow a\:and\:\overrightarrow b$ is acute and that between $\overrightarrow b\:and\:\overrightarrow c$ is obtuse is ?
jeemain
math
class12
ch10
vector-algebra
difficult
vector-product
q66
asked
Nov 29, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a,\:\overrightarrow b\:and\:\overrightarrow c$ are non coplanar vectors and if $\overrightarrow a'=\large\frac{\overrightarrow b\times \overrightarrow c}{[\overrightarrow a\:\overrightarrow b\:\overrightarrow c]},\:\overrightarrow b'=\large\frac{\overrightarrow c\times \overrightarrow a}{[\overrightarrow a\:\overrightarrow b\:\overrightarrow c]},\:and \:\overrightarrow c'=\large\frac{\overrightarrow a\times \overrightarrow b}{[\overrightarrow a\:\overrightarrow b\:\overrightarrow c]},$ then $\overrightarrow a.\overrightarrow a'+\overrightarrow b.\overrightarrow b'+\overrightarrow c.\overrightarrow c'=?$
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q65
asked
Nov 29, 2013
by
rvidyagovindarajan_1
1
answer
For any vector $\overrightarrow a\:\:and\:\:\overrightarrow b$ the angle between $|\overrightarrow a|\overrightarrow b+|\overrightarrow b|\overrightarrow a$ and $|\overrightarrow a|\overrightarrow b-|\overrightarrow b|\overrightarrow a$ is ?
jeemain
math
class12
vector-algebra
ch10
easy
vector-product
q64
asked
Nov 29, 2013
by
rvidyagovindarajan_1
1
answer
If the vectors $p\hat i+\hat j+\hat k,\:\hat i+q\hat j+\hat k,\: \:and\:\:\hat i+\hat j+r\hat k$ $(p\neq q\neq r\neq 1)$ are three coplanar vectors then the value of $pqr-(p+q+r)=?$
jeemain
math
class12
ch10
vector-algebra
easy
addition-of-vectors
q63
asked
Nov 29, 2013
by
rvidyagovindarajan_1
1
answer
The value of $a$ for which the volume of the parallelopiped formed by the vectors $\hat i+a\hat j+\hat k,\:\:\hat j+a\hat k,\:\:a\hat i+\hat k$ is minimum is ?
jeemain
math
class12
ch10
vector-algebra
medium
vector-product
q62
asked
Nov 28, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow u=\hat i+\hat j,\:\overrightarrow v=\hat i-\hat j\:\:and\:\:\overrightarrow w=\hat i+2\hat j+3\hat k$. and if $\hat n$ is a unit vector such that $\overrightarrow u.\hat n=\overrightarrow v.\hat n=0$, then $|\overrightarrow w.\hat n|=?$
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q61
asked
Nov 28, 2013
by
rvidyagovindarajan_1
1
answer
If $\Delta=\begin{vmatrix}x^n&x^{n+2}&x^{2n}\\1&x^p&p\\x^{n+5}&x^{p+6}&x^{2n+5}\end{vmatrix}=0$ then $p$ is given by
jeemain
math
class12
ch4
determinants
q25
properties-of-determinants
difficult
asked
Nov 26, 2013
by
sreemathi.v
1
answer
If a point $(x,y)$ moves on a curve and satisfies the equation $\small\begin{vmatrix}a&b&ax+by\\b&c&bx+cy\\ax+by&bx+ay&0\end{vmatrix}=0$ then
jeemain
math
class12
ch3
matrices
q24
elementary-operation-(transformation)-of-a-matrix
difficult
asked
Nov 26, 2013
by
sreemathi.v
1
answer
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