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Recent questions tagged q20
Questions
When fats are the respiratory substrates RQ is :
jeemain
eamcet
biology
2000
q20
asked
Nov 24, 2013
by
thanvigandhi_1
0
answers
Triganella belongs to the following family
jeemain
eamcet
biology
1999
q20
asked
Nov 22, 2013
by
thanvigandhi_1
0
answers
If $A=\begin{bmatrix}1&x\\x^2&4y\end{bmatrix}$ and $B=\begin{bmatrix}-3&1\\1&0\end{bmatrix}$ and adj$(A+B)=\begin{bmatrix}1 &0\\0&1\end{bmatrix}$ then values of $x$ and $y$ are
jeemain
math
class12
ch4
determinants
q20
adjoint-and-inverse
medium
asked
Nov 22, 2013
by
sreemathi.v
1
answer
The number of values of k for which the system of equations $(k+1)x+8y=4k,kx+(k+3)y=3k-1$ has infinitely many solutions is
jeemain
math
ch4
class12
determinants
q20
system-of-linear-equations
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
Given a reaction $ A + B \rightleftharpoons C + D $ taking place in a 1L vessel. If we start with 1 mole each of A and B, equilibrium concentration of [C] = [D] = 0.5 M. Percentage of A converted into C if we start with 2 moles of A and 1 mole of B, is
jeemain
aipmt
chemistry
equilibrium
difficult
q20
biology
asked
Nov 15, 2013
by
mosymeow_1
1
answer
A black body of mass $34.38\;g$ and surface area$19.2\;cm^2$ is at an initial temperature of $400\;K$. It is allowed to cool inside an evacuated enclosure kept at constant $0.04^{\circ}c$ per second. The specific heat of the body in $J\;kg^{-1} K^{-1}$ is : (Stefan's constant $\sigma = 5.73 \times 10^{-8} Wm ^{-2} K^{-4})$
jeemain
eamcet
physics
2004
q20
asked
Nov 13, 2013
by
meena.p
1
answer
If $A= \begin {bmatrix} -1 & 0 \\ 0 & 2 \end {bmatrix}$ then $A^3-A^2$ is equal to :
jeemain
eamcet
math
2005
q20
asked
Nov 11, 2013
by
meena.p
1
answer
Assertion (A) : Induced mutations are widely used in crop improvement. Reasons (R) : Physical and chemical mutagens cause genetic variability in a population and produce only desirable characters.
jeemain
eamcet
biology
2010
q20
asked
Nov 11, 2013
by
thanvigandhi_1
0
answers
In the reaction
jeemain
eamcet
chemistry
2005
q20
asked
Nov 8, 2013
by
meena.p
0
answers
Two identical bodies have temperatures $277^{\circ}C $ and $67^{\circ}C$. If the surroundings temperature is $27^{\circ}C$, the ratio of loss of heats of the two bodies during the same interval of time is (approximately) :
jeemain
eamcet
physics
2005
q20
asked
Nov 7, 2013
by
meena.p
1
answer
The locus of the point $z=x+iy$ satisfying the equation $\bigg|\large\frac{z-i}{z+i} \bigg|$$=1$is given by :
jeemain
eamcet
math
2006
q20
asked
Nov 5, 2013
by
meena.p
1
answer
If $\overrightarrow a=\hat i-\hat k,\:\overrightarrow b=x\hat i+\hat j+(1-x)\hat k\:and\:\overrightarrow c=y\hat i+x\hat j+(1+x-y)\hat k$, then $[\overrightarrow a\:\overrightarrow b\:\overrightarrow c]$ depends on?
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q20
asked
Nov 4, 2013
by
rvidyagovindarajan_1
1
answer
Calculate number of oxalic acid molecules in 100ml of 0.02N oxalic acid
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q20
easy
asked
Oct 30, 2013
by
sreemathi.v
1
answer
The concentration of oxalic acid is $'x' molL^{-1}$. 40 mL of this solution reacts with 16 mL of 0.05 M acidified $KMnO_4$. What is the pH of 'x' M oxalic acid solution ? (Assume that oxalic acid dissociate completely)
jeemain
eamcet
chemistry
2006
q20
asked
Oct 30, 2013
by
meena.p
1
answer
Two solid spheres A and B made of the same material have radii $r_A$ and $r_B$ respectively. Both the sphere are cooled from the same temperature under the conditions valid for Newton's law of cooling. The ratio of the rate of change of temperature of A and B is :
jeemain
eamcet
physics
2006
q20
asked
Oct 29, 2013
by
meena.p
1
answer
Identify the plant having both spongy petiole and submerged assimilatory roots
jeemain
eamcet
biology
2011
q20
asked
Oct 26, 2013
by
thanvigandhi_1
1
answer
The number of non-arrival solutions of the system $x-y+z=0, x+2y-z=0,2x+y+3z=0$ is
jeemain
eamcet
math
2007
q20
asked
Oct 24, 2013
by
meena.p
1
answer
Match the following:
jeemain
eamcet
chemistry
2007
q20
asked
Oct 23, 2013
by
meena.p
1
answer
On analysis of an impure sample of sodium chloride,the percentage of chloride was found to be 45.5.What is the percentage of pure sodium chloride in the given sample ?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
q20
medium
asked
Oct 23, 2013
by
sreemathi.v
1
answer
A black body radiates energy at the rate of $E watt/m^2$ at a high temperature T K. When the temperature is reduced to $\bigg(\large\frac{T}{2}\bigg)$K, the radiant energy is
jeemain
eamcet
physics
2007
q20
asked
Oct 22, 2013
by
meena.p
1
answer
The sides of a $\Delta$le are three consecutive natural numbers and its largest angle is twice the smallest one.Determine the sides of the triangle
jeemain
math
class11
ch3
trigonometric-functions
q20
angles
difficult
asked
Oct 21, 2013
by
sreemathi.v
1
answer
$\begin {bmatrix} a-b-c & 2a & 2a \\ 2b & b-c-a & 2b \\ 2c & 2c & c-a-b \end{bmatrix}$
jeemain
eamcet
math
2008
q20
asked
Oct 17, 2013
by
meena.p
1
answer
Study the following list
jeemain
eamcet
biology
2012
q20
asked
Oct 16, 2013
by
thanvigandhi_1
1
answer
If $\sin\alpha\sin\beta-\cos\alpha\cos\beta+1=0$ then the value of $\cot\alpha\tan\beta$ is
jeemain
math
class11
ch3
trigonometric-functions
q20
trignometric-equations
medium
asked
Oct 15, 2013
by
sreemathi.v
1
answer
The locus of z satisfying the inequity $\bigg|\large\frac{z+2i}{2z+i}\bigg| < 1,$ where $z=x+iy,$ is :
jeemain
eamcet
math
2009
q20
asked
Oct 9, 2013
by
meena.p
1
answer
If $\large\frac{1+\sin 2x}{1-\sin 2x}$$=\cot^2(a+x)$ $\forall x\in R\sim \big(n\pi+\large\frac{\pi}{4}\big)$$ n\in N$ then $'a'$ is equal to
jeemain
math
class11
ch3
trigonometric-functions
q20
trignometric-identities
easy
asked
Oct 7, 2013
by
sreemathi.v
1
answer
Two wire are made of same material and have same volume However wire 1 has cross-sectional area A and wire 2 has cross-sectional area 3A. If length of wire 1 is increased by $\Delta x$ on applying force F, how much force is needed to stretch wire 2 by same amount
jeemain
physics
class11
unit7
properties-of-solids-and-fluids
q20
medium
asked
Oct 3, 2013
by
meena.p
1
answer
Identify the correct pairs from the following
jeemain
eamcet
biology
2013
q20
asked
Oct 3, 2013
by
thanvigandhi_1
1
answer
If $\omega$ is a complex cube root of unity, then $(x+1)(x+ \omega)(x-\omega-1)=$
jeemain
eamcet
math
2010
q20
asked
Sep 26, 2013
by
meena.p
1
answer
If $f :IR \to IR$ is defined by $f(x) =\bigg[\large\frac{x}{5}\bigg]$ for $ x \in IR,$ Where $[y]$ denotes the greatest integer not exceeding y, then $ (f(x):|x| < 71)=$
jeemain
eamcet
math
2011
q20
asked
Sep 20, 2013
by
meena.p
1
answer
If a complex number z satisfies $|z^2-1|=|z|^2+1,$ then z lies on :
jeemain
eamcet
math
2013
q20
asked
Sep 14, 2013
by
meena.p
1
answer
The vector equation to the plane through the points $(1,-2,-3)$ and parallel to the vectors $(2,3,-6)$ is .............. .
jeemain
eamcet
math
1991
fitb
q20
asked
Sep 13, 2013
by
meena.p
0
answers
$X=\begin {bmatrix} 3 & -4 \\ 1 & -1 \end{bmatrix}$;$X^n$ is equal to :
jeemain
eamcet
math
1991
q20
asked
Sep 13, 2013
by
meena.p
1
answer
When an electron in an excited hydrogen atom jumps from an energy level for which $n=5$ level for which $n=2$ the spectral line is observed in the .................. series of the hydrogen spectrum.
jeemain
eamcet
chemistry
1991
fitb
q20
asked
Sep 12, 2013
by
meena.p
0
answers
A simple harmonic oscillation is represented by the equation $\gamma =0.40 \sin \bigg[\large\frac{40\;t}{7}$$+0.61\bigg]$ where $\gamma$ and $\mathit{t}\;$ are in meters and seconds respectively. The value of time period is ........... sec.
jeemain
eamcet
physics
1991
fitb
q20
asked
Sep 11, 2013
by
meena.p
0
answers
If $\overrightarrow {A}, \overrightarrow {B}$ are perpendicular vectors $ \overrightarrow {A}=5 \hat {i}+7 \hat {j}-3 \hat {k}.\quad \overrightarrow {B}=2 \hat {i}+2 \hat {j}-c \hat {k}$. The value of $\mathit{c}\;$ is:
jeemain
eamcet
physics
1991
q20
asked
Sep 10, 2013
by
meena.p
1
answer
An SN2 reaction in an asymmetric carbon of a compound always give
jeemain
chemistry
unit22
organic-chemistry
halogens
q20
medium
asked
Sep 3, 2013
by
sreemathi.v
1
answer
Average density of the earth
jeemain
physics
class11
unit6
gravitation
q20
medium
asked
Aug 11, 2013
by
meena.p
1
answer
A ball is released from certain height.It loses 50 % of its kinetic energy on striking ground. It will attain height again equal to
jeemain
physics
class11
ch6
kinetic-energy
work-power-energy
q20
easy
asked
Jul 18, 2013
by
meena.p
1
answer
A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block will be
jeemain
physics
class11
unit3
laws-of-motion
q20
easy
asked
Jul 5, 2013
by
meena.p
1
answer
Dimensional formula for $\large\frac{L}{RCV}$ is
jeemain
physics
class11
ch2
units-and-measurement
q20
easy
dimensional-formulae-and-analysis
asked
Jun 17, 2013
by
meena.p
1
answer
The gradient of the tangent to the curve $y=8+4x-2x^{2}$ at the point where the curve cuts the $y$-axis is
tnstate
class12
bookproblem
p231
objective
q20
sec-a
easy
asked
May 16, 2013
by
poojasapani_1
1
answer
If $\overrightarrow{a}$ is a non-zero vector and $m$ is a non-zero scalar then $m\overrightarrow{a} $ is a unit vector if
tnstate
class12
bookproblem
p265
objective
q20
modelpaper
mar-2007
asked
May 8, 2013
by
poojasapani_1
1
answer
Evaluate :$\int \large \frac{dx}{x(x^3+1)}$
cbse
class12
modelpaper
2013
sec-b
q20
65-3
math
asked
Mar 22, 2013
by
sreemathi.v
1
answer
Evaluate :$\int \large \frac{dx}{x(x^3+8)}$
cbse
class12
modelpaper
2013
sec-b
q20
65-2
math
asked
Mar 22, 2013
by
sreemathi.v
1
answer
If $\overrightarrow{a}=\hat{i}-\hat{j}+7\hat{k}$ and $\overrightarrow{b}=5\hat{i}-\hat{j}+\lambda\hat{k}$,then find the value of $\lambda$,so that $\overrightarrow{a}+\overrightarrow{b}$ and $\overrightarrow{a}-\overrightarrow{b}$ are perpendicular vectors.
cbse
class12
modelpaper
2013
sec-b
q20
65-1
math
asked
Mar 20, 2013
by
sreemathi.v
1
answer
If \( \hat i+ \hat j+\hat k,\: 2\hat i+5\hat j,\: 3\hat i+2\hat j=3\hat k\: and \: \hat i-6\hat j-\hat k\) are the position vectorsof the points A,B,C and D, find the angle between \( \overrightarrow{AB}\: and \: \overrightarrow{CD}\). Deduce that \( \overrightarrow{AB}\: and \: \overrightarrow{CD}\) are collinear.
cbse
class12
modelpaper
2012
sec-b
q20
easy
math
asked
Feb 15, 2013
by
thanvigandhi_1
1
answer
If \( \overrightarrow a = \hat i + \hat j + \hat k\: and \: \overrightarrow b = \hat j - \hat k\), find a vector \( \overrightarrow c\) such that \( \overrightarrow a\) x \( \overrightarrow c = \overrightarrow b\: and \: \overrightarrow a.\overrightarrow c=3\)
cbse
class12
modelpaper
2012
sec-b
q20
easy
math
asked
Feb 11, 2013
by
thanvigandhi_1
1
answer
Find the angle between the vectors \(( \overrightarrow a + \overrightarrow b)\: and \: ( \overrightarrow a - \overrightarrow b)\: if \: \overrightarrow a = (2i-j+3k)\: and\: \overrightarrow b = (3\hat i + \hat j -2\hat k).\)
cbse
class12
modelpaper
2012
sec-b
q20
easy
math
asked
Feb 9, 2013
by
thanvigandhi_1
1
answer
Solve the following differential equation : $ x\: \log\: x\: \frac{dy}{dx}+y=\large\frac{2}{x}$$\log\:x $
cbse
class12
modelpaper-2012
sec-b
q20
modelpaper-2014
math
asked
Feb 9, 2013
by
thanvigandhi_1
1
answer
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