Recent questions tagged medium

Consider a block of conducting material of resistivity $ \rho$ shown in the figure. Current I enters at A and leaves from D. We apply superposition principle to find voltage $ \Delta V$ developed between B and C. The calculation is done in the following steps. \[\] (i) Take current I entering from A and assume it to spread over a hemispherical surface in the block. \[\] Calculate field E(r) at distance r from A by using ohm's law $E= \rho j$, where j is the current per unit area at r. \[\] (iii) From the r dependence of E(r) obtain the potential V(r) at r. \[\] (iv) Repeat (i), (ii) and (iii) for current I leaving D and superpose results for A and D \[\] For current entering at A, the electric field at a distance r from A is

asked Feb 14, 2014 by thanvigandhi_1

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When the screen is moved away from plane of slits in YDSE then the effect on interference fringes is

asked Feb 14, 2014 by meena.p

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A parallel plate capacitor with air between the plates has a capacitance of $9\: pF$. The separation between the plates is $d$ . The space between the plates is now filled with two dielectrics. One of the dielectrics has dielectric constant $k_1=3$ and thickness $ \large\frac{d}{3}$ while the other has dielectric constant $k_2=6$ and thickness $ \large\frac{2d}{3}$. Capacitance of the capacitor is now

asked Feb 14, 2014 by thanvigandhi_1

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Which of the following statements about Raoult's Law is/are correct?

asked Feb 14, 2014 by sreemathi.v

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A thin plano- convex lens of focal length f is split into two halves one of halves is shifted along the optical axis. The separation b/w object and image plane is 1.8 m. The magnification of image formed by one of half lenses is 2. Find the focal length of lens and separation b/w the two halves.

asked Feb 14, 2014 by meena.p

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$PtCl_4.6H_2O$ can exist as a hydrated complex. If 1 molal aqueos solution has a depression in freezing point of $3.72^{\large\circ}$,assuming 100% ionization and $K_f$ of $1.86^{\large\circ}mol^{-1}kg$ which of the following is the complex in question?

asked Feb 14, 2014 by sreemathi.v

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Calculate the effective resistance between points A and B

asked Feb 14, 2014 by thanvigandhi_1

1 answer

The cross section of glass prism has the form of an isosceles triangle . One of equal face is silvered. A ray of light incident normally on other equal face and after being reflected twice, emerges through base of prism along normal. That the angle of prism is :-

asked Feb 14, 2014 by meena.p

1 answer

At what temperature would the temperature of a copper conductor be double its value at $0^{\circ}C\: \alpha_{Cu} = 4 \times 10^{-3}$

asked Feb 14, 2014 by thanvigandhi_1

1 answer

12.2gm of benzonic acid (M=122) in 100gm benzene has depression in freezing point $2.6^{\large\circ}C$; $K_f = 5.2 ^{\circ} mol^{-1}kg$. If there is 100% polymerization, the number of molecules of benzonic acid in associated state is

asked Feb 14, 2014 by sreemathi.v

1 answer

The 2.56gm of sulphur in 100gm of $CS_2$ has depression in freezing point of $0.010^{\large\circ}$C. $K_f=0.1^{\large\circ}C$/molal. Hence atomicity of sulphur in $CS_2$

asked Feb 14, 2014 by sreemathi.v

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A lens has a power of +5 diopter in air what will be its power if completely immersed in water ? $ \mu_g =\large\frac{3}{2};$$ \mu_w=\large\frac{4}{3}$

asked Feb 14, 2014 by meena.p

1 answer

Match the column-I with column-II ,which are true for 20% w/w aqueous KI solution (density of KI solution is 1.20g/ml & M.wt of KI is 166 g/mol)

asked Feb 14, 2014 by sreemathi.v

1 answer

Match the column-I and column-II

asked Feb 14, 2014 by sreemathi.v

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Which is true about ideal solutions?

asked Feb 14, 2014 by sreemathi.v

1 answer

Total vapour pressure of mixture of 1 mole $X(P_x^0=150torr)$ and 2 mol Y$(P_y^0=240torr)$ is 210mm.In this case

asked Feb 14, 2014 by sreemathi.v

1 answer

Mole fraction of the benzene in the vapour phase which is in equilibrium with a solution of benzene $(p^0=120torr)$ and toluene$(p^0=80torr)$ having 4.0mole of benzene and 6 mole of toluene in solution.

asked Feb 14, 2014 by sreemathi.v

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Mole fraction of the benzene in the vapour phase which is in equilibrium with a solution of benzene $(p^0=120torr)$ and toluene$(p^0=80torr)$ having 2.0mole of each is

asked Feb 14, 2014 by sreemathi.v

1 answer

Mole fraction of the toluene in the vapour phase which is in equilibrium with a solution of benzene $(p^0=120torr)$ and toluene$(p^0=80torr)$ having 2.0mole of each is

asked Feb 14, 2014 by sreemathi.v

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Under what conditions, can the current passing through the resistance R be increased? r1 and r2 are the internal resistances of the two batteries.

asked Feb 13, 2014 by thanvigandhi_1

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

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

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

asked Feb 13, 2014 by thanvigandhi_1

1 answer

In the circuit shown below, the key K is closed at $ t = 0$. The current through the battery is

asked Feb 13, 2014 by thanvigandhi_1

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?

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

asked Feb 13, 2014 by meena.p

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 :-

asked Feb 13, 2014 by meena.p

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Dissolving 120g of urea (mol.wt.60) in 1000g of water gave a solution of density 1.15g/ml.The molarity of solution is

asked Feb 13, 2014 by sreemathi.v

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

asked Feb 13, 2014 by thanvigandhi_1

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 :-

asked Feb 13, 2014 by meena.p

1 answer

Find the maxima and minima obtained on screen in a $YDSE, D= 1m,d=1mm$ and $ \lambda=\large\frac{1}{2}\;mm$

asked Feb 13, 2014 by meena.p

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

asked Feb 13, 2014 by sreemathi.v

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

asked Feb 13, 2014 by sreemathi.v

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

asked Feb 13, 2014 by sreemathi.v

1 answer

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.

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

asked Feb 13, 2014 by sreemathi.v

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

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

asked Feb 13, 2014 by sreemathi.v

1 answer

Current in the $3\: ohm$ resistor is

asked Feb 13, 2014 by thanvigandhi_1

1 answer

Ethylene glycol is used as an antifreeze in a cold climate.How much mass of ethylene glycol should be added to $5\;kg$ of water to prevent it form freezing at -$6^{\large\circ}C$ will be : $(K_t$ for water =$1.86Kkg mol^{-1}$ and molar mass of ethylene glycol=$62g mol^{-1})$

asked Feb 13, 2014 by sreemathi.v

1 answer

A binary liquid solution is prepared by mixing n-heptane and ethanol.Which one of the following statements is correct regarding the behaviour of the solution?

asked Feb 13, 2014 by sreemathi.v

1 answer

Which of the following aqueous solutions posses zero as Van't Hoff coefficient?

asked Feb 13, 2014 by sreemathi.v

1 answer

Which one of the following solutions will have the lowest freezing point?

asked Feb 13, 2014 by sreemathi.v

1 answer

The osmotic pressures of equimolar solutions of glucose, potassium chloride and Barium chloride will be in the order

asked Feb 13, 2014 by sreemathi.v

1 answer

A 0.3%(w/v) solution of urea (mol.wt.60) would be isotonic with

asked Feb 13, 2014 by sreemathi.v

1 answer

A glass convex lens of refractive index $\large\frac{3}{2}$ has got a focal length equal to $50 \;cm$ Find the focal length of lens if it is immersed in ethyl alcohol of $refractive index \;1.36$

asked Feb 12, 2014 by meena.p

1 answer

How much mass of urea $(NH_2CONH_2)$ is required in preparing 5 kg of 0.50 molal solution? (M.wt of urea=60g)

asked Feb 12, 2014 by sreemathi.v

1 answer

Calculate the dispersive power for crown glass from given data. $\mu_v= 1.523 $ and $\mu_R=1.5145$

asked Feb 12, 2014 by meena.p

1 answer

Find the dispersion produced by a thin prism of $18^{\circ}$ having refractive index fro red light $= 1.56$ and for violet light $=1.68$

asked Feb 12, 2014 by meena.p

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Figure shows two conducting thin concentric shells of radii r and 3r . The outer shell carries charge q . Inner shell is neutral . Find the charge that will flow from inner shell to outer after the switch S is closed .

asked Feb 12, 2014 by yamini.v

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