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Recent questions tagged q18
Questions
The wave described by $y = 0.25 \: \sin \: ( 10\: \pi x\: -2\: \pi t),$ where x and y are in meters and t in seconds, is a wave travelling along the :
aipmt
modelpaper
physics
2008
q18
asked
Dec 15, 2013
by
thanvigandhi_1
0
answers
Integrate : $ \int \limits_0^{\large\frac{\pi}{2}} max ^m \{ \sin x , \cos x \} dx$
jeemain
math
class12
ch7
integral-calculus
integration-using-partial-fractions
easy
q18
asked
Dec 13, 2013
by
meena.p
1
answer
$E^o_{Zn^{+2}/Zn}=0.76V,E^o_{Cu^{+2}/Cu}=0.34V$ find $\Delta G^orx_n$ of following cell $Zn/Zn^{+2}\parallel Cu^{+2}/Cu$
jeemain
chemistry
unit8
redox-reactions-and-electrochemistry
q18
easy
asked
Dec 10, 2013
by
sreemathi.v
1
answer
Stable compounds in +1 oxidation state are formed by
jeemain
chemistry
physical-chemistry
class11
unit4
chemical-bonding-and-molecular-structure
vsepr(valence-shell-electron-pair-repulsion)theory
q18
medium
asked
Dec 9, 2013
by
sreemathi.v
1
answer
The plant breeder who developed the first artificial hybrid ?
jeemain
eamcet
biology
2002
q18
asked
Dec 6, 2013
by
thanvigandhi_1
0
answers
Alkanes containing 6 or more carbon atoms catalytically treated under pressure, passed over chromic oxide carried on an alumina support at temperature ranging 480-550 degree C,eventually
jeemain
chemistry
unit21
organic-chemistry
q18
difficult
basic-organic-chemistry
class11
ch12
asked
Dec 4, 2013
by
sreemathi.v
1
answer
Under conditions where carbocation rearrangements are not observed, 3 products are obtained from the addition of HBr to 1,3-pentadiene. Which of the following structures are not expected to be among the products?
jeemain
chemistry
unit21
organic-chemistry
q18
medium
basic-organic-chemistry
class11
ch12
asked
Dec 3, 2013
by
sreemathi.v
1
answer
An example of xerophytic plants with cladode is
jeemain
eamcet
biology
2001
q18
asked
Dec 1, 2013
by
thanvigandhi_1
0
answers
Shape of $H_2S$ is
jeemain
chemistry
unit15
p-block-elements
q18
easy
asked
Nov 26, 2013
by
sreemathi.v
1
answer
Matrix $A$ satisfies $A^2=2A-I$ where $I$ is the identity matrix then for $n^32A^n$ is equal to $(n\in N)$
jeemain
math
class12
ch3
matrices
q18
operations-on-matrices
difficult
asked
Nov 25, 2013
by
sreemathi.v
1
answer
Vascular wilts are caused by this pathogen :
jeemain
eamcet
biology
2000
q18
asked
Nov 24, 2013
by
thanvigandhi_1
0
answers
As compared to sclerenchyma, parenchyma does NOT function in
jeemain
eamcet
biology
1999
q18
asked
Nov 22, 2013
by
thanvigandhi_1
0
answers
If $A$ and $B$ are square matrices of the same order such that $(A+B)(A-B)=A^2-B^2$ then $(ABA^{-1})^2$ is equal to
jeemain
math
class12
ch3
matrices
q18
equality-of-matrices
medium
asked
Nov 22, 2013
by
sreemathi.v
1
answer
The determinant $\begin{vmatrix}xp+y&x&y\\yp+z&y&z\\0 &xp+y&yp+z\end{vmatrix}=0$ if
jeemain
math
ch4
class12
determinants
q18
properties-of-determinants
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
For the following gaseous equilibria X, Y and Z at 300 K. $X: 2SO_2 + O_2 \rightleftharpoons 2SO_3$ $Y: PCl_5 \rightleftharpoons PCl_3 + Cl_2$ $Z: 2HI \rightleftharpoons H_2 + I_2$ ratio of $K_p$ and $K_c$ in the increasing order is:
jeemain
aipmt
chemistry
equilibrium
difficult
q18
biology
asked
Nov 15, 2013
by
mosymeow_1
1
answer
The pressure and density of a given mass of a diatomic gas $\bigg(\gamma =\large\frac{7}{5}\bigg)$ change adiabatically from $(P,d)\;to \; (P',d'')$. If $\large\frac{d''}{d}$$=32$, then $\large\frac{P'}{P}$ is $(\gamma$= ratio of specific heats)
jeemain
eamcet
physics
2004
q18
asked
Nov 13, 2013
by
meena.p
1
answer
If $m [-3 \quad 4]+n [ 4 \quad -3]=[10 \quad -11]$ then $3m+7n$ is equal to :
jeemain
eamcet
math
2005
q18
asked
Nov 11, 2013
by
meena.p
1
answer
Study the following lists
jeemain
eamcet
biology
2010
q18
asked
Nov 10, 2013
by
thanvigandhi_1
0
answers
Which of the following is correct ?
jeemain
eamcet
chemistry
2005
q18
asked
Nov 8, 2013
by
meena.p
0
answers
The ratio of specific heats of a gas is $ \gamma$. The change in internal energy of one mole of the gas, when the volume changes from V to 2V at constant pressure P is :
jeemain
eamcet
physics
2005
q18
asked
Nov 7, 2013
by
meena.p
1
answer
If A is an invertible matrix of order n , then the determinant of adj A is equal to :
jeemain
eamcet
math
2006
q18
asked
Nov 5, 2013
by
meena.p
1
answer
If $\overrightarrow a$ and $\overrightarrow b$ are such that $|\overrightarrow a+\overrightarrow b|=\sqrt {29}$ and $\overrightarrow a\times (2\hat i+3\hat j+4\hat k)=(2\hat i+3\hat j+4\hat k) \times \overrightarrow b$, then the possible value of $(\overrightarrow a+\overrightarrow b).(-7\hat i+2\hat j+3\hat k)=?$
jeemain
math
class12
ch10
vector-algebra
difficult
vector-product
q18
asked
Nov 4, 2013
by
rvidyagovindarajan_1
1
answer
Which of the following is not a characteristic property of chemical equilibrium?
jeemain
eamcet
chemistry
2006
q18
asked
Oct 30, 2013
by
meena.p
1
answer
Find the number of g-molecules of oxygen in $6.023\times 10^{24}$ CO molecules
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q18
easy
asked
Oct 30, 2013
by
sreemathi.v
1
answer
A given mass of a gas is compressed isothermally until its pressure is doubled. It is then allowed to expand adiabatically until its original volume is restored and its pressure is then found to be 0.75 of its initial pressure. The ratio of the specific heats of the gas is approximately :
jeemain
eamcet
physics
2006
q18
asked
Oct 29, 2013
by
meena.p
1
answer
Study the following combinations and identify the correct matches
jeemain
eamcet
biology
2011
q18
asked
Oct 26, 2013
by
thanvigandhi_1
1
answer
If $\begin {bmatrix} 1 & 2 & x \\ 4 & -1 & 7\\ 2 & 4 & -6\end{bmatrix}$ is a singular matrix, then x is equal to
jeemain
eamcet
math
2007
q18
asked
Oct 24, 2013
by
meena.p
1
answer
\[CH_3 COOH \quad \underrightarrow {LiAlH_4} \quad A\] \[A +CH_3COOH \quad \underrightarrow {H_3O^{+}} \quad B+H_2O\] In the abive reactions 'A' and 'B' respectively are
jeemain
eamcet
chemistry
2007
q18
asked
Oct 23, 2013
by
meena.p
1
answer
Calculate the percentage of nitrogen present in the composition of calcium nitrate.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
q18
medium
asked
Oct 23, 2013
by
sreemathi.v
1
answer
The temperature of the system decreases in the process of
jeemain
eamcet
physics
2007
q18
asked
Oct 22, 2013
by
meena.p
1
answer
Let $a,b,c$ be positive real numbers .Let $\theta=\tan^{-1}\sqrt{\large\frac{a(a+b+c)}{bc}}+$$\tan^{-1}\sqrt{\large\frac{b(a+b+c)}{ca}}$$+\tan^{-1}\sqrt{\large\frac{c(a+b+c)}{ab}}$.Then $\tan\theta$
jeemain
math
class12
ch2
inverse-trigonometric-functions
q18
inverse-trignometric-properties
difficult
asked
Oct 21, 2013
by
sreemathi.v
1
answer
If $A=\begin {bmatrix} 1 & -2 \\ 4 & 5 \end{bmatrix}$ and $f(t)=t^2-3t+7$, then $f(A)+ \begin {bmatrix} 3 & 6 \\ 12 & -9 \end{bmatrix} = $
jeemain
eamcet
math
2008
q18
asked
Oct 17, 2013
by
meena.p
0
answers
Study the following lists
jeemain
eamcet
biology
2012
q18
asked
Oct 16, 2013
by
thanvigandhi_1
1
answer
If $\cos A=m\cos B$ and $\cot\large\frac{A+B}{2}$$=\lambda\tan\large\frac{B-A}{2}$ then $\lambda$ is
jeemain
math
class11
ch3
trigonometric-functions
q18
trignometric-equations
medium
asked
Oct 15, 2013
by
sreemathi.v
1
answer
If $\begin{bmatrix} 1 & -1 & x \\ 1 & x & 1 \\ x & -1 &1 \end {bmatrix}$ has no inverse, then the real value of x is :
jeemain
eamcet
math
2009
q18
asked
Oct 9, 2013
by
meena.p
1
answer
If $\cos x=\large\frac{2\cos y-1}{2-\cos y}$ where $x,y\in (0,\pi)$ then $\tan\large\frac{x}{2}$$.\cot\large\frac{y}{2}$ is equal to
jeemain
math
class11
ch3
trigonometric-functions
q18
trignometric-identities
easy
asked
Oct 7, 2013
by
sreemathi.v
1
answer
A capillary of shapes as shown is dipped in a liquid. Contact angle between liquid minisues is to be neglected . T is surface tension of liquid, r is radius of meniscus g is acceleration due to gravity $\rho$ is density of the liquid then height h in equillibrium is
jeemain
physics
class11
unit7
properties-of-solids-and-fluids
q18
medium
asked
Oct 3, 2013
by
meena.p
1
answer
Study the following lists
jeemain
eamcet
biology
2013
q18
asked
Oct 3, 2013
by
thanvigandhi_1
1
answer
If A is a nonzero square matrix of order $n$ with det $(I+A) \neq 0$ and $A^3=0$, Where $I,O$ are unit and null matrices of order $n \times n $ respectively the $(1+A^{-1})=$
jeemain
eamcet
math
2010
q18
asked
Sep 26, 2013
by
meena.p
1
answer
If $y=y(x)$ is the solution of the differential equation $\bigg(\large\frac{2+ \sin x}{y+1}\bigg) \frac{dy}{dx} $$+ cos x=0$ with $y(0)=1,$ then $y\bigg(\large\frac{\pi}{2}\bigg)=$
jeemain
eamcet
math
2011
q18
asked
Sep 20, 2013
by
meena.p
1
answer
The number of real values of $t$ such that the system of homogeneous equations:\[tx+(t+1)y+(t-1)z=0\]\[(t+1)x+ty+(t+2)z=0\] \[(t-1)x+(t+2)y+tz=0\] has non-trivial solutions, is
jeemain
eamcet
math
2013
q18
asked
Sep 14, 2013
by
meena.p
1
answer
The locus of the middle points of chord of the circle $x^2+y^2-2x=0$ passing through the orgin is ................. .
jeemain
eamcet
math
1991
fitb
q18
asked
Sep 13, 2013
by
meena.p
0
answers
Derive $\sec^{-1}\bigg(\large\frac{1}{2x^2-1}\bigg)$ with respect to $\sqrt {1+3x}$ at $x=-\large\frac{1}{3}$:
jeemain
eamcet
math
1991
q18
asked
Sep 13, 2013
by
meena.p
1
answer
One atom of $^{39}_{19} K$ contains :
jeemain
eamcet
chemistry
1991
q18
asked
Sep 11, 2013
by
meena.p
1
answer
A body of mass $\mathit{m}\;$ thrown horizontally with velocity $\mathit{v}\;$, from the top of tower of height $\mathit{h}\;$, touches the level of ground at a distance of 250 m from the foot of the tower. A body of mass $2\mathit{m}\;$, thrown horizontally with velocity $\mathit{v/}\;2$, from the top of a tower of height $4\mathit{\;h}\;$ will touch the level ground at a distance .................. meters from the foot of the tower.
jeemain
eamcet
physics
1991
fitb
q18
asked
Sep 11, 2013
by
meena.p
0
answers
A piece of aluminium and germanium each are cooled from $T_1\;K $ to $T_2\;K$. The resistance of:
jeemain
eamcet
physics
1991
q18
asked
Sep 10, 2013
by
meena.p
1
answer
Arrange the following in decreasing order of SN1 reactivity
jeemain
chemistry
unit22
organic-chemistry
halogens
q18
medium
asked
Sep 3, 2013
by
sreemathi.v
1
answer
For what value of \( \lambda \) is the function defined by \(f\) defined by $ f(x) = \left\{ \begin{array} {1 1} \lambda(x^2 - 2x) ,& \quad\text{ if $ x $ \(\leq 0\)}\\ 4x + 1,& \quad \text{if $x$ > 0}\\ \end{array} \right.$ What about continuity at \( x = 1\)?
cbse
class12
bookproblem
ch5
sec1
q18
q18-2
p160
sec-a
easy
math
asked
Aug 19, 2013
by
sreemathi.v
1
answer
Light planet is revolving around a very massive star in a circular orbit of radius 'r' with a period of revolution T. On what power of 't' will the square of period depend if the gravitational force of attraction between planet and the star is proportional to $r^{\large\frac{-5}{2}}$
jeemain
physics
class11
unit6
gravitation
q18
medium
asked
Aug 10, 2013
by
meena.p
1
answer
If the unit of force and length each increased by 4 times , then the unit of energy is increased by
jeemain
physics
class11
ch6
work
work-energy-theorem
work-power-energy
q18
easy
dimensional-formulae-and-analysis
units-and-measurements
asked
Jul 18, 2013
by
meena.p
1
answer
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