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A moving coil galvanometer of resistance $100 \Omega$ is used as an ammeter using a resistance of $ 0.1 \Omega$. The maximum deflection current in the galvanometer is $100 \mu A$. Find the current in the circuit so that the ammeter shows full scale deflection
jeemain
physics
current-electricity
cbse
class12
ch5
meter-bridge-and-potentiometer-instrumentation
medium
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Rutherford proposed the atomic model after his most striking experiment on $\alpha$ – scattering leading to discovery of nucleus. Bohr later on modified the atomic model on the basis of Planck’s quantum theory of light and proposed the concept of stationary circular orbits of quantised energy $\large\frac{nh}{2\pi}$. The collection of fine lines in line spectrum led Sommerfeld to gave the idea of elliptical orbits. He successfully explained the existence of subshells and their number in a shell. The angular momentum of subshells was propped as $\sqrt{l(l+1}\times\large\frac{h}{2\pi}$. The emission of a spectral line in atomic spectra was supposed to be due to the jump of electron from one energy level to other. Calculate the total number of fundamental particles in $^{14}_6C$ is
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q184
asked
Feb 8, 2014
by
sharmaaparna1
1
answer
A rigid container with thermally insulated walls contains a coil of $100 \Omega$ resistance with a current of $1A$. Change in internal energy after 5 min will be
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
A steady current flows in a metallic conductor of non-uniform cross-section. The quantity/quantities constant along the length of the conductor are
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
medium
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Rutherford proposed the atomic model after his most striking experiment on $\alpha$ – scattering leading to discovery of nucleus. Bohr later on modified the atomic model on the basis of Planck’s quantum theory of light and proposed the concept of stationary circular orbits of quantised energy $\large\frac{nh}{2\pi}$. The collection of fine lines in line spectrum led Sommerfeld to gave the idea of elliptical orbits. He successfully explained the existence of subshells and their number in a shell. The angular momentum of subshells was propped as $\sqrt{l(l+1}\times\large\frac{h}{2\pi}$. The emission of a spectral line in atomic spectra was supposed to be due to the jump of electron from one energy level to other. Calculate the Non-directional orbital.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q183
asked
Feb 8, 2014
by
sharmaaparna1
1
answer
A capacitor $C_1$ of capacitance $1 \mu F$ and $C_2$ of capacitance $ 2 \mu F$ are separately charged by a common battery for a long time. The two capacitors are then separately discharged through equal resistors. Both the discharge circuits are connected at $t=0$. One or more of the following happen.
jeemain
physics
electrostatic-potential-and-capacitance
cbse
class12
ch3
charging-and-discharging-of-capacitors
medium
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
A capacitor of capacitance $ 500 \mu F$ is connected to a battery through a $10k \Omega $resistor. Then, which of the following are true: \[\] The charge stored on the capacitor in the first $5s$ is larger than the charge stored in the next
jeemain
physics
electrostatic-potential-and-capacitance
cbse
class12
ch3
charging-and-discharging-of-capacitors
easy
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Rutherford proposed the atomic model after his most striking experiment on $\alpha$ – scattering leading to discovery of nucleus. Bohr later on modified the atomic model on the basis of Planck’s quantum theory of light and proposed the concept of stationary circular orbits of quantised energy $\large\frac{nh}{2\pi}$. The collection of fine lines in line spectrum led Sommerfeld to gave the idea of elliptical orbits. He successfully explained the existence of subshells and their number in a shell. The angular momentum of subshells was propped as $\sqrt{l(l+1}\times\large\frac{h}{2\pi}$. The emission of a spectral line in atomic spectra was supposed to be due to the jump of electron from one energy level to other. Then the volume occupied by the nucleus is about .....times of volume of atom.
jeemain
chemistry
atomic-structure
unit2
class11
easy
q182
asked
Feb 8, 2014
by
sharmaaparna1
1
answer
A wire of length $L$ and $3$ identical cells of negligible internal resistances are connected in series. Due to the current, the temperature of the wire is raised by $ \Delta T$ in a time $t$. A number $N$ of similar cells are now connected in series with a wire of the same material and cross-section but of length $2L$. The temperature is raised by the same amount $ \Delta T$ in the same time. The value of $N$ is
jeemain
physics
current-electricity
cbse
class12
ch4
electrical-energy-and-power
difficult
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
In steady state, a resistor is carrying a current $i$. The power lost to the surroundings is $b(T- T_0)$. Here $b$ is a constant, $T$ is the temperature of the resistance and $T_0$ is the surrounding temperature. If the coefficient of linear expansion is $ \alpha$. The strain in the wire is
jeemain
physics
current-electricity
cbse
class12
ch4
electrical-energy-and-power
difficult
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Rutherford proposed the atomic model after his most striking experiment on $\alpha$– scattering leading to discovery of nucleus. Bohr later on modified the atomic model on the basis of Planck’s quantum theory of light and proposed the concept of stationary circular orbits of quantised energy $\large\frac{nh}{2\pi}$. The collection of fine lines in line spectrum led Sommerfeld to gave the idea of elliptical orbits. He successfully explained the existence of subshells and their number in a shell. The angular momentum of subshells was propped as $\sqrt{l(l+1}\times\large\frac{h}{2\pi}$. The emission of a spectral line in atomic spectra was supposed to be due to the jump of electron from one energy level to other. Calculate the angular momentum of electron in 2p orbital is
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
medium
q181
asked
Feb 8, 2014
by
sharmaaparna1
1
answer
The length of the potentiometer wire is l. A cell of emf E is balanced at length $ \large\frac{l}{3}$ from the positive end of the wire. If the length of the wire is increased by $ \large\frac{l}{2}$, at what distance will the same cell give a balance point
jeemain
physics
current-electricity
cbse
class12
ch4
medium
meter-bridge-and-potentiometer-instrumentation
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
Two wires of resistivity $\rho 1$ and $ \rho 2$ are connected in parallel. Equivalent resistivity of the combination is
jeemain
physics
current-electricity
cbse
class12
ch4
resistivity
medium
asked
Feb 8, 2014
by
thanvigandhi_1
1
answer
$\large\frac{dy}{dx}$$=1$ passes through $\large[$$0,\large\frac{3}{2}]$ and $ \large\frac{dy}{dx}$$=2$ passes through $[0,1]$ represents two curve which passes through a point whose coordinates are zeroes of a quadratic polynomial . The quadratic equation is gradient polynomial. Find sum of coefficients of $x^3,x^2,x$
jeemain
math
class12
ch9
differential-equations
homogeneous-differential-equations
q98
difficult
asked
Feb 7, 2014
by
meena.p
1
answer
A tank contains $200\; gal$ of water of $40\; lb$ salt dissolves. $5\; gal$ of brine , each containing $2\; lb$ of dissolved salt, run into tank per minute and mixture kept uniform by stirring runs out at same rate. Find amount of salt $y(t)$ in tank at any time $(t)$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q97
difficult
asked
Feb 7, 2014
by
meena.p
1
answer
Solve : $2e^{\Large\frac{x}{y}}(dx-dy)+dx-2e^{\Large\frac{x}{y}} \large\frac{x}{y}$$dy=0$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q96
medium
asked
Feb 7, 2014
by
meena.p
1
answer
Solve : $y'= 1+y^2$
jeemain
math
class12
ch9
differential-equations
linear-differential-equations
q95
easy
asked
Feb 7, 2014
by
meena.p
1
answer
The two curves represents by $9yy'+4x=0,\; y(0)=2,\; yy'+x=0,\; y(0)=3$ then number of common normals for two curves will be
jeemain
math
class12
ch9differential-equations
linear-differential-equations
q94
medium
asked
Feb 7, 2014
by
meena.p
1
answer
Initially the spheres A and B are at potential $\;V_{A}\;$ and $\;V_{B}\;$ respectively . Now sphere B is earthed by closing the switch . The potential of A will now become
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Feb 7, 2014
by
yamini.v
1
answer
Find solution of differential equation $(y-x+1) dy -(y+x+2)dx=0$
jeemain
math
class12
ch9
differential-equations
linear-differential-equations
q93
medium
asked
Feb 7, 2014
by
meena.p
1
answer
Find solution : $(x-2y+1) dy -(3x-6y+2)dx=0$
jeemain
math
class12
ch9
differential-equations
linear-differential-equations
q92
medium
asked
Feb 7, 2014
by
meena.p
1
answer
Eliminate arbitrary constant and obtain differential equation $x^2-y^2= a(x^2+y^2)^2$
jeemain
math
class12
ch9
differential-equations
homogeneous-differential-equations
q91
medium
mock
asked
Feb 7, 2014
by
meena.p
1
answer
What is the relation between $b$ and $a$ for an hyperbola?
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q99
easy
asked
Feb 7, 2014
by
sreemathi.v
1
answer
What should be the value of eccentricity for a hyperbola?
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q98
easy
asked
Feb 7, 2014
by
sreemathi.v
1
answer
The locus of a point which moves in a plane such that its distance from a fixed point (i.e focus) is e times its distance from a fixed line (i.e directix).It is called as __________
jeemain
math
class11
coordinate-geometry-conic -sections
hyperbola
ch11
q97
easy
asked
Feb 7, 2014
by
sreemathi.v
1
answer
Solve: $(3xy+y^2)dx+(x^2+xy)dy=0 \qquad y(1)=1$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q90
medium
asked
Feb 7, 2014
by
meena.p
1
answer
A charged particle of mass m and charge q is released from rest from the position $\;(x_{0} ,0)\;$ in a uniform electric field $\;E_{0} \hat{j}\;.$ The angular momentum of particle about origin
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Feb 7, 2014
by
yamini.v
1
answer
Find the locus of mid-points of the portions of the tangents to the ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$ intercepted between the axis?
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q96
difficult
asked
Feb 7, 2014
by
sreemathi.v
1
answer
Solve: $\large\frac{dy}{dx}=\frac{-\sqrt {1-y^2}}{x-e^{\Large\sin ^{-1}y}}$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q89
difficult
asked
Feb 7, 2014
by
meena.p
1
answer
Find the locus of feet of perpendicular from the foci on and tangent to an ellipse?
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q95
difficult
asked
Feb 7, 2014
by
sreemathi.v
1
answer
An electric dipole is placed perpendicular to an infinite line of charge at some distance as shown in figure . Identify the correct statement
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
medium
asked
Feb 7, 2014
by
yamini.v
1
answer
Find the length of sub tangent and sub-normal for an ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$?
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q94
difficult
asked
Feb 7, 2014
by
sreemathi.v
1
answer
If the angle between the straight line joining foci and the ends of the minor axis of the ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$ is $90^{\large\circ}$ .Find its eccentricity?
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q93
medium
asked
Feb 7, 2014
by
sreemathi.v
1
answer
Potential due to a system at polar coordinates $\;(r , \theta)\;$ is given by $\;\large\frac{\alpha \;cos \theta}{r^2}\;$ Find the magnitude of electric field at that point if $\;\alpha=3 Vm^2\;,(r , \theta)=(\sqrt{3} ,tan^{-1} \large\frac{1}{\sqrt{2}}). $
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
medium
asked
Feb 7, 2014
by
yamini.v
1
answer
The equation $\large\frac{x^2}{5-a}+\frac{y^2}{4-a}$$=1$ represent ellipse if value of 'a' belongs to what value?
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q92
medium
asked
Feb 7, 2014
by
sreemathi.v
1
answer
The length of the major axis of the ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$ is 2 times the length of minor axis its eccentricity is :
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q91
medium
asked
Feb 7, 2014
by
sreemathi.v
1
answer
Find potential difference $\;V_{AB}\;$ between $\;A(0,0,0)$ and $\;B(1m ,1m, 0)\;$ in an electric field $\;\overrightarrow{E}=y \hat{i}+x \hat{j}$
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatic-potential
medium
asked
Feb 7, 2014
by
yamini.v
1
answer
A uniform electric field exists in x -y plane. The potential of points $\;A (2m ,2m) , B (-2m ,2m)\;and\; C(2m ,4m)\;$ are 4V , 16V and 12V respectively . The electric field is
jeemain
physics
class12
unit11
electrostatics
medium
asked
Feb 7, 2014
by
yamini.v
1
answer
Find the value of p for which $e=\large\frac{1}{2}$ where ellipse is $\large\frac{x^2}{4}+\frac{y^2}{p^2}$$=1$?
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q90
medium
asked
Feb 7, 2014
by
sreemathi.v
1
answer
Solve : $y''+e^{2y}(y')^3=0$
jeemain
math
class12
ch9
differential-equations
formation-of-differential-equations
q88
medium
asked
Feb 7, 2014
by
meena.p
1
answer
Find the maximum area of $\Delta PSS'$ for the ellipse $\large\frac{x^2}{36}+\frac{y^2}{16}$$=1$ where S,S' are foci & P is any point on ellipse?
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q89
medium
asked
Feb 7, 2014
by
sreemathi.v
1
answer
Find general solution of equation $y'-2y+a=0$ a=fixed
jeemain
math
class12
ch9
differential-equations
homogeneous-differential-equations
q87
medium
asked
Feb 7, 2014
by
meena.p
1
answer
Find the equation of chord of contact of tangents drawn from a point $(x_1,y_1)$ to the ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$.
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q88
medium
asked
Feb 7, 2014
by
sreemathi.v
1
answer
Find the common tangent of $x^2+y^2=4$ and $2x^2+y^2=2$.
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q87
medium
asked
Feb 7, 2014
by
sreemathi.v
1
answer
The electric field on the axis of a dipole of dipole moment $\;\overrightarrow{P}\;$ at a distance x from the line joining the charges and $\;(x > > d)\;$
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-flux-and-dipole
medium
asked
Feb 7, 2014
by
yamini.v
1
answer
Find the equation of director circle for ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$?
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q86
medium
asked
Feb 7, 2014
by
sreemathi.v
1
answer
Calculate the shortest and longest wavelength in H spectrum of Lyman series. $R_H = 109678 cm^{-1}$
sat
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
medium
q180
asked
Feb 7, 2014
by
sharmaaparna1
1
answer
The ecentricity of an ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$ whose latus rectum is half to its major axis is e.Find the value of e?
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q85
medium
asked
Feb 7, 2014
by
sreemathi.v
1
answer
Find the length of lactus rectum and end points of lactus rectum for a ellipse $\large\frac{x^2}{a^2}+\frac{y^2}{b^2}$$=1$?
jeemain
math
class11
coordinate-geometry-conic -sections
ellipse
ch11
q84
medium
asked
Feb 7, 2014
by
sreemathi.v
1
answer
There are four concentric shells A , B , C ,D of radii a , 2a ,3a and 4a respectively . Shells B and D are given charges +q and -q respectively . Shell C is now earthed . The potential difference $\;V_{A}-V_{C}\;$ is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
medium
asked
Feb 7, 2014
by
yamini.v
1
answer
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