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In a modified YDSE a monochromatic uniform and parallel beam of light of wavelength 6000 A and intensity $\bigg(\large\frac{10}{\pi}\bigg) \large\frac{w}{m^2}$ is incident normally on two circular operates A and B of radii $0.001\;m $ and $0.002\;m$ respectively. A perfectly transparent film of thickness $2000 A^{\circ}$ and refractive index $1.5 $ for wavelength $6000\;A^{\circ}$ is placed in front of aperture A. Calculate the pour (in waters) received at Focal spot F of lens. The lens is symmetrically placed with respect to aperture. Assume $10 \%$ of power received by each aperture goes in original direction and is bought to focal speet.
jeemain
physics
class12
wave-optics
youngs-double-slit-experiment
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
An inductor of inductance $ L = 400\: mH$ and resistors of resistances $R1 = 2\Omega$ and $R2 = 2\Omega$ are connected to a battery of $emf\: 12V$ as shown in the figure. The internal resistance of the battery is negligible. The switch $K$ is closed at $t= 0$. The potential drop across $L$ as a function of time is
jeemain
physics
electromagnetic-induction
cbse
class12
ch3
q94
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Two points $P$ and $Q$ are maintained at the potentials of $10V$ and $-4V$ respectively. The work done in moving $100$ electrons from $P$ to $Q$ is
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Two conductors have the same resistance at $0^{\circ} C$ but their temperature coefficients of resistance are $ \alpha 1 \: and \: \alpha 2$. The temperature coefficient for the parallel combination is
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Two conductors have the same resistance at $0^{\circ}C$ but their temperature coefficient of resistance are $ \alpha 1\: and \: \alpha 2$. The temperature coefficient for the series combination is
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
A beam of light consisting of two wavelength $6500 A^{\circ}$ and $5200 A^{\circ}$ is used to obtain interference fringes in a young's double slit exp. Then what is the distance from central maxima where the bright fringes due to both wavelength coincides? The distance between slits is 2 mm and distance between plane of slits and screen is 120 cm
jeemain
physics
class12
unit16
wave-optics
sec-b
youngs-double-slit-experiment
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
In the circuit shown below, the key K is closed at $ t = 0$. The current through the battery is
jeemain
physics
electromagnetic-induction
cbse
class12
ch6
inductance
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
The intensity of an electric field depends on the coordinates x and y as follows $\;\overrightarrow{E}=\large\frac{a\;(x \hat{i} + y \hat{j})}{x^2+y^2}\;$ where a is constants. Find the charge within a sphere of radius R with the centre at the origin
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 13, 2014
by
yamini.v
1
answer
A 4 cm thick layer of water covers 6 cm thick glass slab. A coin is placed at the bottom of slab and is being observed from the air side along the normal to surface. Then the apparent position of coin surface is
jeemain
physics
class12
unit16
ray-optics-and-optical-instruments
refraction
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
A $1.37\; M$ aqueous solution of citric acid ($H_3C_6 H_5O_7$; Molecular Weight = $192.1 g/mol$) has a density of $1.10 g/cm^{3}.$ What is the molality and mole fraction of the citric acid?
composition-of-a-solution
medium
basics
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
asked
Feb 13, 2014
by
sreemathi.v
1
answer
What is the molarity of 0.60N $H_3PO_4$ (a tribasic acid)in the following reaction?$H_3PO_4+2OH^-\rightarrow HPO_4^{2-}+2H_2O$
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
easy
basics
asked
Feb 13, 2014
by
sreemathi.v
1
answer
In a YDSE with $D= 1m,d=1mm$ light of wave length $500 \;nm$ is incident at an angle of $0.57^{\circ}$ with respect to axis of symmetry of experimental set up. If centre of symmetry of screen is 0. Then the intensity at point 0 in terms of intensity of central maxima $I_0$ is
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 13, 2014
by
meena.p
1
answer
A charged +Q is uniformly distributed in a spherical volume of radius R . A particle of charge +q and mass m projected with velocity $\;v_{0}\;$ from the surface of the spherical volume to its centre inside a smooth tunnel dug across the sphere . The minimum value of $\;v_{0}\;$ such that it just reaches the centre of the spherical volume is
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 13, 2014
by
yamini.v
1
answer
What is the normality of 0.20M $H_3PO_4$ (a tribasic acid)in the following reaction?$H_3PO_4+2OH^-\rightarrow HPO_4^{2-}+2H_2O$
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
easy
basics
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Let C be the capacitance of a capacitor discharging through a resistor R. Suppose t1 is the time taken for the energy stored in the capacitor to reduce to half its initial value and t2 is the time taken for the charge to reduce to one-fourth its initial value. Then the ratio $ \large\frac{t1}{t2}$ will be
jeemain
physics
electrostatic-potential-and-capacitance
cbse
class12
ch3
charging-and-discharging-of-capacitors
difficult
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
In a YDSE with $d= 1mm$ and $D= 1m$ slabs of $(t= 1 \mu m , \mu =3)$ and $(t=0.5\;\mu m , \mu =2) $ are introduced in front of upper and lower slit respectively . Then the shift in fringe pattern is :-
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
The current through the battery is
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
White light is used in a YDSE with $D= 1m$ and $d= 0.9 mm$ .Light reaching the screen at position $y= 1 mm$ is passed through a prism and its spectrum is obtained. The missing lines in the visible region of this spectrum is :-
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 13, 2014
by
meena.p
1
answer
The freezing point (in$^{\large\circ}C)$ of a solution containing 0.1g of $K_3[Fe(CN)_6]$ (mol .wt .329) in 100g of water $(K_t=1.86Kkgmol^{-1})$
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
depression-of-freezing-point
easy
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Dissolving 120g of urea (mol.wt.60) in 1000g of water gave a solution of density 1.15g/ml.The molarity of solution is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
medium
composition-of-a-solution
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Monochromatic light of wavelength $5000\;A^{\circ} $ is used in Y.D.S.E with slit- width $d= 1 mm$distance between screen and slits $D=1\;m$ Find the distance of 1000 th maxima
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
easy
asked
Feb 13, 2014
by
meena.p
1
answer
The net resistance between the points A and B is
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
difficult
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
In the circuit shown in the figure, reading of the voltmeter is V1 when only S1 is closed, V2 when only S2 is closed and V3 when both S1 and S2 are closed. Then
jeemain
physics
current-electricity
cbse
class12
ch5
ohms-law
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
For dilute solutions containing 2.5g of a non-volatile non electrolyte solute in 100g of water,the elevation in boiling point at 1atm pressure is $4^{\large\circ}C$.Assuming concentration of solute is much lower than the concentration of solvent,the vapour pressure (mm of Hg) of the solution is (take $K_b=0.76Kkgmol^{-1})$
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
lowering-vapour-pressure
elevation-of-boiling-point
difficult
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Monochromatic light of wavelength $5000\;A^{\circ} $ is used in Y.D.S.E with slit- width $d= 1 mm$distance between screen and slits $D=1\;m$ .Then the distance of 5th minima from central maxima on screen is :-
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 13, 2014
by
meena.p
1
answer
A particle of mass m and charge q is fastened to one end of a string of length l . The other end of the string is fixed to the point O . The whole system lies on a frictionless horizontal plane . Initially , the mass is at rest at A . A uniform electric field in the direction shown is the switched on . Then speed of the particle at B and tension in the string are
jeemain
physics
class12
ch1
electrostatics
electric-charges-and-fields
electric-field
difficult
asked
Feb 13, 2014
by
yamini.v
1
answer
For dilute solutions containing 2.5g of a non-volatile non electrolyte solute in 100g of water,the elevation in boiling point at 1atm pressure is $2^{\large\circ}C$.Assuming concentration of solute is much lower than the concentration of solvent,the vapour pressure (mm of Hg) of the solution is (take $K_b=0.76Kkgmol^{-1})$
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
colligative-properties
lowering-vapour-pressure
elevation-of-boiling-point
difficult
asked
Feb 13, 2014
by
sreemathi.v
1
answer
When no current passes through a conductor
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Find the maxima and minima obtained on screen in a $YDSE, D= 1m,d=1mm$ and $ \lambda=\large\frac{1}{2}\;mm$
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
medium
asked
Feb 13, 2014
by
meena.p
1
answer
Suppose you have three variable resistors each of range 15 ohms to 30 ohms. Which of the following values of equivalent resistance cannot be obtained using these 3 variable resistors?
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
A uniform wire of resistance $100\: ohms$ is cut into 10 equal parts and are connected in parallel to each other. The equivalent resistance of the combination is
jeemain
physics
current-electricity
cbse
class12
ch5
equivalent-resistance
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
98%(w/w) $H_2SO_4$ stock solution has a density of 1.8gm$L^{-1}$.The molecular weight of $H_2SO_4$ is 98g$mol^{-1}$.The volume(ml) of stock solution required to prepare a 1800ml of 1.0N $H_2SO_4$ is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
medium
asked
Feb 13, 2014
by
sreemathi.v
1
answer
The product of resistivity and conductivity of a conductor with uniform cross-section depends on
jeemain
physics
current-electricity
cbse
class12
ch5
resistivity
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
As the temperature of a metallic conductor is increased, the product of resistivity and conductivity
jeemain
physics
current-electricity
cbse
class12
ch5
resistivity
easy
asked
Feb 13, 2014
by
thanvigandhi_1
2
answers
A current passes through a resistor. Let K1 and K2 be the average kinetic energy of the conduction electrons and metal ions respectively. Then:
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Two resistors R and 2R are connected in series in a circuit. The thermal energy developed in R and 2R are in the ratio
jeemain
physics
current-electricity
cbse
class12
ch3
q79
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
Two resistors R and 2R are connected in parallel in a circuit. The thermal energy developed in R and 2R are in the ratio
jeemain
physics
current-electricity
cbse
class12
ch5
electrical-energy-and-power
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
29.2%(w/w) HCl stock solution has a density of 1.25g$ml^{-1}$.The molecular weight of HCl is 36.5$gmol^{-1}$.The volume (ml) of stock solution required to prepare a 500ml of 0.1M HCl is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
medium
asked
Feb 13, 2014
by
sreemathi.v
1
answer
In a YDSE, $D = 1m \; d= 1mm$ and $\lambda =\large\frac{1}{2}$$mm$ Then the distance between the first and central maxima on screen
jeemain
physics
class12
unit16
wave-optics
youngs-double-slit-experiment
difficult
asked
Feb 13, 2014
by
meena.p
1
answer
98%(w/w) $H_2SO_4$ stock solution has a density of 1.8g.m$L^{-1}$.The molecular weight of $H_2SO_4$ is 98g$mol^{-1}$.The volume (ml) of stock solution required to prepare a 450ml of 1.0M $H_2SO_4$ is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
medium
asked
Feb 13, 2014
by
sreemathi.v
1
answer
Consider the following two statements \[\] (A) Kirchhoff’s junction law follows from conservation of charge \[\] (B) Kirchhoff’s loop law follows from the conservative nature of electric field \[\] Then which of the following is true:
jeemain
physics
current-electricity
cbse
class12
ch5
kirchoffs-law
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
A charge q is placed at O in the cavity in a spherical uncharged conducter . Point S is outside the conducter . If q is displaced from O towards S (still remaining with in the cavity )
jeemain
physics
class12
ch2
electrostatics
electrostatic-potential-and-capacitance
electrostatics-of-conductors
difficult
asked
Feb 13, 2014
by
yamini.v
1
answer
Two resistors A and B have their resistances $R_A\: and\: R_B$ with $R_A\: >\: R_B$. The resistivities of their material are related by
jeemain
physics
current-electricity
cbse
class12
ch5
resistivity
easy
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
A metallic resistor is connected across a battery. If the number of collisions of free electrons with the lattice is somehow decreased in the resistor, the current will
jeemain
physics
current-electricity
cbse
class12
ch5
electric-current-concepts
easy
asked
Feb 13, 2014
by
thanvigandhi_1
2
answers
Light from two sources , each of same frequency and travelling in same direction. but with intensity in ratio 4:1 interface. Find ratio of maximum to minimum intensity.
jeemain
physics
class12
unit16
wave-optics
addition-of-waves
medium
asked
Feb 13, 2014
by
meena.p
1
answer
98%(w/w) $H_2SO_4$ stock solution has a density of 1.8g.m$L^{-1}$.The molecular weight of $H_2SO_4$ is 98g$mol^{-1}$.The volume (ml) of stock solution required to prepare a 900ml of 0.5M $H_2SO_4$ is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
medium
asked
Feb 13, 2014
by
sreemathi.v
1
answer
The root mean square speed of an ideal gas at constant pressure varies with density d as
jeemain
chemistry
physical-chemistry
class11
unit5
states-of-matter
liquifaction-of-gases
easy
q20
asked
Feb 13, 2014
by
sharmaaparna1
1
answer
In the circuit shown, potential difference between the points A and B is $16V$. The current passing through the $2\Omega$ resistor will be
jeemain
physics
current-electricity
cbse
class12
ch5
kirchoffs-law
medium
asked
Feb 13, 2014
by
thanvigandhi_1
1
answer
$29.2\%$(w/w) $HCl$ stock solution has a density of $1.25gmL^{-1}$. The molecular weight of $HCl$ is $36.5g\;mol^{-1}.$ Find the volume $(ml)$ of stock solution required to prepare a $200\;ml$ of $0.4\;M\; HCl$ is
cbse
class11
chemistry
ch1
some-basic-concepts-of-chemistry
jeemain
physical-chemistry
class12
ch2
solutions
composition-of-a-solution
medium
asked
Feb 13, 2014
by
sreemathi.v
1
answer
$S_1$ and $S_2$ are two sources of light which produce individually disturbance at a point P given by $\in _1=3 \sin wt,\;\in _2 =4 \cos wt$ Assuming $\overrightarrow {\in_1}$ and $\overrightarrow{\in_2}$ to be along the same line then result of their superposition is
jeemain
physics
class12
unit16
wave-optics
addition-of-waves
easy
aims-12-physics
asked
Feb 13, 2014
by
meena.p
1
answer
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