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Recent questions tagged q23
Questions
Assertion (A) :Propagation of light through an option fibre is due to total internal reflection taking place place at the core-clad interface. Reason (R): Refractive index of the material of the core of the optical fibre is greater than that of air .
jeemain
eamcet
physics
2005
q23
asked
Nov 7, 2013
by
meena.p
0
answers
Area of a parallelogram with adjacent sides $\overrightarrow a=\overrightarrow p+2\overrightarrow q,$ and $\overrightarrow b=2\overrightarrow p+\overrightarrow q$, where $\overrightarrow p,\overrightarrow q$ are unit vectors with angle $\large\frac{\pi}{6}$ between them is ?
jeemain
math
class12
ch10
vector-algebra
medium
vector-product
q23
asked
Nov 6, 2013
by
rvidyagovindarajan_1
1
answer
$\sin 120^{\circ} \cos 150^{\circ}- cos 240^{\circ} \sin 330^{\circ}$ is equal to :
jeemain
eamcet
math
2006
q23
asked
Nov 5, 2013
by
meena.p
1
answer
How many milliliter of 0.5M $H_2SO_4$ are needed to dissolve 0.5g of copper II carbonate?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q23
easy
asked
Oct 31, 2013
by
sreemathi.v
1
answer
Which of the products is formed when acetone is reacted with barium hydroxide solution ?
jeemain
eamcet
chemistry
2006
q23
asked
Oct 30, 2013
by
meena.p
1
answer
The two surfaces of a biconvex lens has same radii of curvatures. This lens is made of glass of refractive index 1.5 has a focal length 10 cm in air. The lens is cut into two equal halves along a plane perpendicular to its principal axis to yield two plano-convex lenses. The two pieces are glued such that the convex lenses. The two pieces are glued such that the convex surface touch each other. If this combination lens is immersed in water(refractive index=4/3), its focal length (in cm) is :
jeemain
eamcet
physics
2006
q23
asked
Oct 29, 2013
by
meena.p
1
answer
Study the following statements
jeemain
eamcet
biology
2011
q23
asked
Oct 26, 2013
by
thanvigandhi_1
1
answer
A value of n such that $\bigg(\large\frac{\sqrt 3}{2}+\frac{i}{2}\bigg)^n$$=1$ is
jeemain
eamcet
math
2007
q23
asked
Oct 24, 2013
by
meena.p
1
answer
Calculate the empirical formula for a compound that contains 26.6% potassium,35.4% chromium and 38.1% oxygen.(Given :K=39.1,Cr=52,O=16)
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
q23
medium
asked
Oct 24, 2013
by
sreemathi.v
1
answer
The following are some statement related to VA group hydrides,
jeemain
eamcet
chemistry
2007
q23
asked
Oct 23, 2013
by
meena.p
1
answer
Match the following
jeemain
eamcet
physics
2007
q23
asked
Oct 22, 2013
by
meena.p
1
answer
The radii $r_1,r_2,r_3$ of described circle of a $\Delta$le ABC are in harmonic progression.If its area is 24sq .cm,and its perimeter is 24,find the lengths of its sides
jeemain
math
class11
ch3
trigonometric-functions
q23
angles
difficult
asked
Oct 21, 2013
by
sreemathi.v
1
answer
If $m_1,m_2,m_3$ and $m_4$ respectively denote the moduli of the complex numbers $1+4 i,3+i,1-i,$ and $2-3i,$ then the correct one, among the following is
jeemain
eamcet
math
2008
q23
asked
Oct 17, 2013
by
meena.p
1
answer
Two different plants associated with the discovery of two different phytohormones having common biosynthetic precursor exhibit one of the following character each
jeemain
eamcet
biology
2012
q23
asked
Oct 16, 2013
by
thanvigandhi_1
1
answer
$\cos\large\frac{\pi}{11}$$\cos\large\frac{2\pi}{11}$$\cos\large\frac{3\pi}{11}..........$$\cos\large\frac{11\pi}{11}$ is equal to
jeemain
math
class11
ch3
trigonometric-functions
q23
basic-trigonometric-functions
medium
asked
Oct 15, 2013
by
sreemathi.v
1
answer
$\large\frac{\cos x}{\cos (x-2y)}$$=\lambda => \tan (x-y) \tan y=$
jeemain
eamcet
math
2009
q23
asked
Oct 9, 2013
by
meena.p
1
answer
The angle between minute hand and hour hand of a clock at "half past 4" equals
jeemain
math
class11
ch3
trigonometric-functions
q23
angles
easy
asked
Oct 7, 2013
by
sreemathi.v
1
answer
The volume of solid rubber ball when it is carried from surface of 200 m deep lake decreases by $0.1\%$ The value for bulk modulus elasticity of rubber will be
jeemain
physics
class11
unit7
properties-of-solids-and-fluids
q23
easy
asked
Oct 4, 2013
by
meena.p
1
answer
Assertion (A) : Application of cytokinins causes the opening of stomata $ $ Reason (R) : cytokinins induce the influx of potassium ions into guard cells.
jeemain
eamcet
biology
2013
q23
asked
Oct 3, 2013
by
thanvigandhi_1
1
answer
$a \sin ^2 \theta+ b \cos ^2 \theta=c=>\tan ^2 \theta=$
jeemain
eamcet
math
2010
q23
asked
Sep 26, 2013
by
meena.p
1
answer
The number of five digit numbers divisible by 5 that can be formed using the numbers $0,1,2,3,4,5$ without repetition is
jeemain
eamcet
math
2011
q23
asked
Sep 20, 2013
by
meena.p
1
answer
$\sin \theta+\cos \theta=p, \sin ^3 \theta+\cos ^3 \theta=q=>p(p^2-3)=$
jeemain
eamcet
math
2013
q23
asked
Sep 14, 2013
by
meena.p
1
answer
In $\Delta ABC,a= \sqrt 3+1, \angle B=30^{\circ},\; \angle C=45^{\circ};$ then $c=$................ .
jeemain
eamcet
math
1991
fitb
q23
asked
Sep 13, 2013
by
meena.p
0
answers
The conjugate base of $HSO^-_4$ ion is ............. .
jeemain
eamcet
chemistry
1991
fitb
q23
asked
Sep 12, 2013
by
meena.p
0
answers
The method of connecting the negative pole of battery to $\mathit{p}\;$- material and positive pole to $\mathit{n}\;$-material of a $\mathit{p-n}\;$ junction is called .................... connection.
jeemain
eamcet
physics
1991
fitb
q23
asked
Sep 11, 2013
by
meena.p
0
answers
The most probable product in the following reaction will be
jeemain
chemistry
unit22
organic-chemistry
halogens
q23
medium
asked
Sep 4, 2013
by
sreemathi.v
1
answer
The eacape velocity from earth is 11km/s. The escape velocity from a planet having twice the radius and same mean density as that of earth is
jeemain
physics
class11
unit6
gravitation
q23
medium
asked
Aug 12, 2013
by
meena.p
1
answer
From an automatic gun a man fires 360 bullets per minute with speed of 360 km/hr. If each weighs 20g the power of gun
jeemain
physics
class11
ch6
work-power-energy
q23
easy
power
asked
Jul 18, 2013
by
meena.p
1
answer
Obtain the inverse of the following matrix using elementary operations :$A=\begin{bmatrix}3 & 0 & -1\\2 & 3 & 0\\0 & 4& 1\end{bmatrix}$
cbse
class12
modelpaper
2012
sec-c
q23
math
asked
Jul 18, 2013
by
sreemathi.v
1
answer
A horizontal force F is applied on a rod inserted between two identical blocks A and B placed over a rough surface as shown.Force F is gradually increased then which of the block will move first.
jeemain
physics
class11
unit3
laws-of-motion
q23
difficult
asked
Jul 8, 2013
by
meena.p
1
answer
The dimensions of $CV^2$ match with the dimensions of
jeemain
physics
class11
ch2
units-and-measurement
q23
easy
dimensional-formulae-and-analysis
asked
Jun 17, 2013
by
meena.p
1
answer
If a normal makes an angle $\theta$ with positive $x$-axis then the slope of the curve at the point where the normal is drawn is
tnstate
class12
bookproblem
p231
objective
q23
sec-a
medium
modelpaper
oct-2007
asked
May 16, 2013
by
poojasapani_1
1
answer
If $A=\large\frac{1}{3}$$\begin{bmatrix} 2 & 2 & 1 \\-2 & 1 & 2 \\1 & -2 & 2 \end{bmatrix}$ prove that $A^{-1}=A^T$.
tnstate
class12
bookproblem
p265
objective
q23
modelpaper
jun-2006
mar-2007
jun-2008
oct-2008
asked
May 8, 2013
by
poojasapani_1
1
answer
Find the vector equation of the line passing through the point (1,2,3) and parallel to the planes $\overrightarrow{r}.(\hat{i}-\hat{j}+2\hat{k})=5$ and $\overrightarrow{r}.(3\hat{i}+\hat{j}+\hat{k})=6.$
cbse
class12
modelpaper
2013
sec-c
q26
q26-2
65-1
q23
q23-2
65-2
65-3
math
asked
Mar 20, 2013
by
sreemathi.v
1
answer
Find the equation of the plane passing through the line of intersection of the planes $\overrightarrow{r}.(\hat{i}+3\hat{j})-6=0$ and $\overrightarrow{r}.(3\hat{i}-\hat{j}-4\hat{k})=0$,whose perpendicular distance from origin is unity.
cbse
class12
modelpaper
2013
sec-c
q26
q26-1
65-1
q23
q23-1
65-2
65-3
math
asked
Mar 20, 2013
by
sreemathi.v
1
answer
Find the equations of tangents to the curve $3x^2-y^2=8$,which pass through the point$\big(\frac{4}{3},0\big)$. (Note: This question has been split into 2 questions)
cbse
class12
modelpaper
2013
sec-c
q23
q23-2
65-1
26-2
65-2
27-2
65-3
math
asked
Mar 20, 2013
by
sreemathi.v
1
answer
Find the area of the greatest rectangle that can be inscribed in an ellipse $\Large \frac{x^2}{a^2}+\frac{y^2}{b^2}\normalsize = 1.$
cbse
class12
modelpaper
2013
sec-c
q23
q23-1
65-1
q26
q26-1
65-2
q27
q27-1
65-3
math
asked
Mar 20, 2013
by
sreemathi.v
1
answer
Find the volume of the largest cylinder that can be inscribed in a sphere of radius r.
cbse
class12
modelpaper
2012
sec-c
q23
difficult
math
asked
Feb 15, 2013
by
thanvigandhi_1
1
answer
A tank with rectangular base and rectangular sides, open at the top is to be constructed so that its depth is 2m and volume is \( 8m^3\). If building of tank costs Rs. 70 per sq. metre for the base and Rs.45 per sq. metre for sides, what is the cost of least expensive tank?
cbse
class12
modelpaper
2012
sec-c
q23
math
asked
Feb 15, 2013
by
thanvigandhi_1
0
answers
Find the maximum area of the isosceles triangle inscribed in the ellipse $ \large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$ with its vertex at one end of major axis.
class12
modelpaper
2012
sec-c
q23
difficult
asked
Feb 11, 2013
by
thanvigandhi_1
1
answer
Show that the semi-vertical angle of the right circular cone of given total surface area and maximum volume is \( sin^{-1} \frac{1}{3} \).
class12
modelpaper
2012
sec-c
q23
medium
asked
Feb 11, 2013
by
thanvigandhi_1
1
answer
Using matrices, solve the following system of equation \[ x+y-z=3\] \[ 2x+3y+z=10 \] \[ 3x-y-7z=1\]
cbse
class12
modelpaper
2012
sec-c
q23
math
asked
Feb 11, 2013
by
thanvigandhi_1
1
answer
A small firm manufactures items A and B. The total number of items that it can manufacture in a day is at the most 24 items. A takes one hour to make while item B takes only half an hour. The maximum time available per dat is 16 hours. If the profit on one unit of item A be Rs. 300 and that of one unit of item B be Rs. 160, how many of each type of item should be produced to maximize the profit? Solve the problem graphically.
cbse
class12
modelpaper
2012
sec-c
q23
difficult
math
asked
Feb 9, 2013
by
thanvigandhi_1
1
answer
Using matrices, solve the following system of equation \[ 2x+8y+5z=5\]\[x+y+z=-2\]\[x+2y-z=2\]
cbse
class12
modelpaper
2012
sec-c
q23
math
asked
Feb 8, 2013
by
thanvigandhi_1
1
answer
If $A = \begin{bmatrix} 2 & -3 & 5 \\ 3 & 2 & -4 \\ 1 & 1 & -2 \end{bmatrix} $ find \( A^{-1}\). Using \( A^{-1}\) solve the system of equations:\( 2x-3y+5z=11; 3x+2y-4z=-5; x+y-2z = -3\)
cbse
class12
modelpaper
2012
sec-c
q23
ch4
bookproblem
sec6
q15
p137
math
asked
Feb 7, 2013
by
thanvigandhi_1
0
answers
Obtain the inverse of the following matrix using elementary operation $A = \begin{bmatrix} 0 & 1 & 2 \\ 1 & 2 & 3 \\ 3 & 1 & 1 \end{bmatrix} $
cbse
class12
modelpaper
2012
sec-c
q23
2009
q32
ch3
medium
math
asked
Feb 7, 2013
by
thanvigandhi_1
1
answer
Obtain the inverse of the following matrix, using elementary operations $ A = \begin{bmatrix} 3 & 0 & -1 \\ 2 & 3 & 0 \\ 0 & 4 & 1 \end{bmatrix} $
cbse
class12
modelpaper
2012
sec-c
q23
2009
q26
ch3
medium
math
asked
Feb 6, 2013
by
thanvigandhi_1
1
answer
Find the equation of the plane passing through the point (1,1,-1) and perpendicular to the planes : $ x+2y+3z-7=0 \: and \: 2x-3y+4z=0 $
cbse
class12
modelpaper
2012
sec-c
q23
medium
math
asked
Feb 6, 2013
by
thanvigandhi_1
1
answer
Using elementary transformations, find the inverse of the matrix : $ \begin{bmatrix} 2 & 0 & -1 \\ 5 & 1 & 0 \\ 0 & 1 & 3 \end{bmatrix} $
cbse
class12
modelpaper
2012
sec-c
q23
ch3
medium
math
asked
Feb 5, 2013
by
thanvigandhi_1
1
answer
Use product of AB where $A= \begin{bmatrix} 1 & -1 & 2 \\ 0 & 2 & -3 \\ 3 & -2 & 4 \end{bmatrix} \; and \;B=\begin{bmatrix} -2 & 0 & 1 \\ 9 & 2 & -3 \\ 6 & 1 & -2 \end{bmatrix}$ <br> to solve the system of equations : $ \\ x-y+2z=1 \\ 2y-3z=1 \\ 3x-2y+4z=2 $
cbse
class12
modelpaper
2012
sec-c
q23
ch3
math
asked
Feb 5, 2013
by
thanvigandhi_1
1
answer
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