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JEEMAIN and NEET
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If the radius of first Bohr orbit of hydrogen atom is 'x' then de Broglie wavelength of electron in $3^{rd}$ Orbit is nearly
sat
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
medium
q179
asked
Feb 7, 2014
by
sharmaaparna1
1
answer
For what value of $\lambda$ does the line $y=x+\lambda$ touches the ellipse $\large\frac{x^2}{36}+\frac{y^2}{25}$$=1$?
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q83
medium
asked
Feb 7, 2014
by
sreemathi.v
1
answer
If the electric potential of the inner shell is 10V and that of the outer shell is 5V , then the potential at the centre will be
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Feb 7, 2014
by
yamini.v
1
answer
How many times does light travel faster in vaccum than an electron in Bohr first orbit of hydrogen atom?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
medium
q178
asked
Feb 7, 2014
by
sharmaaparna1
1
answer
Find the condition of tangency for a line $y=mx+c$ touches the ellipse
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q82
medium
asked
Feb 7, 2014
by
sreemathi.v
1
answer
Potential difference between centre and surface of the sphere of radius R and $\rho$ uniform volume charge density within it will be
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Feb 7, 2014
by
yamini.v
1
answer
Imagine an atom made up of proton and a hypothetical particle of double the mass of electron but having the same charge as the electron . Apply the Bohr's atomic model and consider all possible transitions of this hypothetical particle to the first excited level. The largest wavelength photon that will be emitted has wavelength $\lambda$ (given in terms of the Rydberg constant R for the hydrogen atom) equal to.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
medium
q177
asked
Feb 7, 2014
by
sharmaaparna1
1
answer
Find all values of m for which $y-e^{mx}$ is solution of equation $y'''-2y''-y'+2y=0$
jeemain
math
class12
ch9
differential-equations
homogeneous-differential-equations
q86
medium
asked
Feb 7, 2014
by
meena.p
1
answer
Find the equation of the ellipse referred to its centre whose minor axis is equal to the distance between the foci and whose latus is 10?
jeemain
math
class11
coordinate-geometry-conic-sections
parabola
ch11
q81
medium
asked
Feb 7, 2014
by
sreemathi.v
2
answers
Which of following satisfy the differential equation $y'+2xy=0?$
jeemain
math
class12
ch9
differential-equations
ordinary-differential-equations
q85
easy
asked
Feb 7, 2014
by
meena.p
1
answer
Three concentric matallic shells A , B and C of radii R , 2R and 3R have surface charge densities $\;\sigma , -\sigma\;and\;\sigma\;$ respectively . Find the potential difference between A & C
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Feb 7, 2014
by
yamini.v
1
answer
Which of the following satisfy differential equation $(1- \sin x) ^2 y''=\cos x$
jeemain
math
class12
ch9
differential-equations
ordinary-differential-equations
q84
medium
asked
Feb 7, 2014
by
meena.p
1
answer
The total energy of the electron of H-atom in the Second quantum State is $E_2$. The total energy of the ${He^+}$ atom in the third quantum state is
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q201
asked
Feb 7, 2014
by
sharmaaparna1
1
answer
Find the length of major and minor axes of the ellipse $3x^2+2y^2=6$?Also find its eccentricity?
jeemain
math
class11
coordinate-geometry-conic-sections
ellipse
ch11
q80
medium
asked
Feb 7, 2014
by
sreemathi.v
1
answer
When a hydrogen atom emits a photon of energy 12.1eV, the orbital angular momentum changes by
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
difficult
q176
asked
Feb 7, 2014
by
sharmaaparna1
1
answer
Two concentric conducting spheres of radii R and 2R are carrying charges Q and -2Q respectively . If the charge on inner sphere is doubled the potential difference between the two spheres will becomes
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Feb 7, 2014
by
yamini.v
1
answer
Find nature of curve not passing through origin for which tangent at any point P. on curve is equal to radius vector of point P.
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q83
difficult
asked
Feb 7, 2014
by
meena.p
1
answer
Find the equation of an ellipse whose focus is $(-1,1)$ eccentricity is $\large\frac{1}{2}$ and the directix is $x-y+3=0?$
jeemain
math
class11
coordinate-geometry-conic-sections
ellipse
ch11
q79
easy
asked
Feb 7, 2014
by
sreemathi.v
1
answer
Find the position of the point (4,-3) relative to the ellipse $5x^2+7y^2=140$?
jeemain
math
class11
coordinate-geometry-conic-sections
ellipse
ch11
q78
easy
asked
Feb 7, 2014
by
sreemathi.v
1
answer
The largest internal for which solution of differential equation $\large\frac{dy}{dx}=\sqrt {\large\frac{1-y^2}{(1+x^2)^2}}$ where $y(0)= \large\frac{1}{\sqrt 2}$ holds good is
jeemain
math
class12
ch9
differential-equations
homogeneous-differential-equations
q82
difficult
asked
Feb 7, 2014
by
meena.p
1
answer
Four point charges $\;+1 \mu C ,+1 \mu C,-1 \mu C-1 \mu C\;$ are placed at the four consecutive corners of a square of side 0.1m . What is the magnitude of electric field at E as shown in figure .
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Feb 7, 2014
by
yamini.v
1
answer
Find the parametric form of normal for the ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$?
jeemain
math
class11
coordinate-geometry-conic-sections
ellipse
ch11
q77
easy
asked
Feb 7, 2014
by
sreemathi.v
1
answer
Find the equation of normal for ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$?
jeemain
math
class11
coordinate-geometry-conic-sections
ellipse
ch11
q76
easy
asked
Feb 7, 2014
by
sreemathi.v
1
answer
Solve : $\log \bigg(\large\frac{1}{x}.\frac{dy}{dx}\bigg)$$=2x+5y$
jeemain
math
class12
ch9
differential-equations
homogeneous-differential-equations
q81
easy
asked
Feb 7, 2014
by
meena.p
1
answer
Form a differential equation represent family of curve given by $y= (c_1+c_2) -\sin (x+c_3)-c_4 e^{x+c_5}$
jeemain
math
class12
ch9
differential-equations
homogeneous-differential-equations
q80
medium
asked
Feb 7, 2014
by
meena.p
1
answer
Solve : $ \bigg(4 \sin ^{-1} \log \bigg(\large\frac{d^4y}{dx^4}\bigg)\bigg)^3=x+y^2$
jeemain
math
class12
ch9
differential-equations
ordinary-differential-equations
q79
easy
asked
Feb 7, 2014
by
meena.p
1
answer
Find the order and degree of differential equation : $e^{\Large\frac{d^6y}{dx^6}}-x^2 \large\frac{d^4y}{dx^4}$$+y=0$
jeemain
math
class12
ch9
differential-equations
order-and-degree-of-a-differential-equation
q78
easy
asked
Feb 7, 2014
by
meena.p
1
answer
Two wires of resistivity $\rho 1$ and $\rho 2$ are connected in series. Equivalent resistivity of the combination is
jeemain
physics
current-electricity
cbse
class12
ch4
resistivity
medium
asked
Feb 6, 2014
by
thanvigandhi_1
1
answer
A $4 \mu F$ capacitor and a 2.5MW resistor are connected in series with a 12V battery. Find the time after which the potential difference across the capacitor is 3 times the potential difference across the resistor.
jeemain
physics
electrostatic-potential-and-capacitance
cbse
class12
charging-and-discharging-of-capacitors
easy
asked
Feb 6, 2014
by
thanvigandhi_1
1
answer
The potential difference across the terminals of a battery is 10V when there is a current of 3A in the battery from the negative to the positive terminal. When the current is 2A in the reverse direction, the potential difference becomes 15V. The internal resistance of battery is
jeemain
physics
current-electricity
cbse
class12
ch4
easy
cells-emf-internal-resistance
asked
Feb 6, 2014
by
thanvigandhi_1
1
answer
Which of the following has the maximum resistance?
jeemain
physics
current-electricity
cbse
class12
ch4
easy
meter-bridge-and-potentiometer-instrumentation
concepts
asked
Feb 6, 2014
by
thanvigandhi_1
1
answer
Two identical batteries having emf 2.4 V and internal resistance 0.5$ \Omega$ are connected as shown. Potential Difference between A and B is
jeemain
physics
current-electricity
cbse
class12
ch4
cells-emf-internal-resistance
medium
asked
Feb 6, 2014
by
thanvigandhi_1
1
answer
Current through the 2$ \Omega$ resistor is
jeemain
physics
current-electricity
cbse
class12
ch4
kirchoffs-law-wheatstone-bridge
easy
asked
Feb 6, 2014
by
thanvigandhi_1
1
answer
A piece of copper and another of silicon are cooled from room temperature to 75K. The resistance of
jeemain
physics
current-electricity
cbse
class12
ch4
electric-current-conceptseasy
asked
Feb 6, 2014
by
thanvigandhi_1
1
answer
Solve : $ x \large\frac{dy}{dx}- \frac{y}{2}$$=x(\sin ^{-1}x) y^5$
jeemain
math
class12
ch9
differential-equations
solving-using-separation-of-variables
q77
medium
asked
Feb 6, 2014
by
meena.p
1
answer
Find the solution : $ (1+x^4) \large\frac{dy}{dx}$$-4x^3y =(x^5+x) \tan ^{-1} (x^2) \qquad y(1)=\pi$
jeemain
math
class12
ch9
differential-equations
solving-using-separation-of-variables
q76
medium
asked
Feb 6, 2014
by
meena.p
1
answer
A charge Q is placed at a distance $\;\large\frac{a}{2}\;$ above the centre of a horizontal , square surface of edge a as shown in figure . Find the flux of the electric field through the square surface
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Calculate the potential energy of the system shown in figure
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential-energy-of-a-system-of-charges
medium
asked
Feb 6, 2014
by
yamini.v
1
answer
Solve: $ (e^x+e^{-x} )\large\frac{dy}{dx}$$=1- \large\frac{(e^x+e^{-x})^2}{(e^x-e^{-x})}$$y$
jeemain
math
class12
ch9
differential-equations
homogeneous-differential-equations
q75
easy
asked
Feb 6, 2014
by
meena.p
1
answer
Find the equation of tangent for ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$?
jeemain
math
class11
coordinate-geometry-conic-sections
ellipse
ch11
q75
easy
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Solve : $y' +\tan x.y =\tan x \quad y(\large\frac{\pi}{4})$$=1$
jeemain
math
class12
ch9
differential-equations
homogeneous-differential-equations
q74
easy
asked
Feb 6, 2014
by
meena.p
1
answer
Find the parametric form of tangent for the ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}=$$1$
jeemain
math
class11
coordinate-geometry-conic-sections
ellipse
ch11
q74
easy
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Find the coordinate of double ordinate for the ellipse $\large\frac{x^2}{a^2}+\large\frac{y^2}{b^2}$$=1$
jeemain
math
class11
coordinate-geometry-conic-sections
ellipse
ch11
q73
easy
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Find the solution : $\large\frac{\sqrt x -2}{\sqrt y -1}$$dy =\large\frac{\sqrt y+1}{\sqrt x +2}$$dx$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q73
easy
asked
Feb 6, 2014
by
meena.p
1
answer
Find the vertex and focus of the parabola $\large\frac{x^2}{64}+\frac{y^2}{100}$=1.
jeemain
math
class11
coordinate-geometry-conic-sections
ellipse
ch11
q72
easy
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Solve : $\large\frac{dy}{dx}$$=\sqrt {16 x^2 y -4x^2 y^2}\qquad y(2)=1$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q72
medium
asked
Feb 6, 2014
by
meena.p
1
answer
Find the position of the point (1,1) relative to the ellipse $\large\frac{x^2}{64}+\frac{y^2}{100}$=1.
jeemain
math
class11
coordinate-geometry-conic-sections
ellipse
ch11
q71
easy
asked
Feb 6, 2014
by
sreemathi.v
1
answer
Solve : $(x^2+1) dy =(4x+xy^2)dx$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q71
medium
asked
Feb 6, 2014
by
meena.p
1
answer
Solve : $e^x y dx=(e^{2x}+1) dy \quad y \cos =1$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q70
medium
asked
Feb 6, 2014
by
meena.p
1
answer
Find the eccentricity of ellipse $\large\frac{x^2}{64}+\frac{y^2}{100}=1$?
jeemain
math
class11
coordinate-geometry-conic-sections
ellipse
ch11
q70
easy
asked
Feb 6, 2014
by
sreemathi.v
1
answer
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