Recent questions tagged set f

Under ambiet conditions , which among the following surfactants will form micelles in aqueous solution at lower molar concentration ?

asked Oct 5, 2015 by meena.p

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$A+2B \to C$ , the rate equation for this reaction is given as $Rate = k[A][B]$. If the concentration of A is kept the same but that of B is doubled What will happen to the rate itself ?

asked Oct 5, 2015 by meena.p

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At $298\;K$ the standard reduction potential are $1.51\;V$ for $MnO_4^{-} |Mn^{2+}, 1.36\;V$ for $Cl_2|Cl^{-}, 1.07\;V$ for $Br_2|Br^{-}$, and $0.54\;V$ for $I_2|I^{-}.$ At $pH=3$ permanganate is expected to oxidize$\bigg( \large\frac{RT}{F} $$=0.059\;V\bigg)$

asked Oct 5, 2015 by meena.p

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The increase of pressure on ice to water system at constant temperature will lead to :

asked Oct 5, 2015 by meena.p

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Determination of the molar of acetic acid in benzene using freezing point depression is affected by

asked Oct 5, 2015 by meena.p

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For the equilibrium, $A(g) \to B(g), \Delta H$ is $-40\;kJ/mol$. If the ratio of the activation energies of the forward $(E_f)$ and reverse $(E_b)$ reaction is $ \large\frac{2}{3}$ then

asked Oct 5, 2015 by meena.p

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Molecule $AB$ has a bond length of $1.617 A^{\circ}$ and a dipole moment of $0.38\;D$. The fractional charge on each atom (absolute magnitude) is : $(e_0=4.802 \times 10^{-10}\;esu)$

asked Oct 5, 2015 by meena.p

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At temperature T, the average kinetic energy of any particles is $\large\frac{3}{2}$KT . The de Brogile wavelength follows the order :

asked Oct 5, 2015 by meena.p

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When does a gas deviate the most from its ideal behaviour?

asked Oct 5, 2015 by meena.p

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$A+2B+3C \to AB_2C_3$ Reaction of $60\;g$ of $A, 6.0 \times 10^{23}$ atomic mass of A and C are $60$ and $80$ amu, respectively , the atomic mass of B is (Avogadro no $=6 \times 10^{23}$):

asked Oct 5, 2015 by meena.p

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The AC voltage across a resistance can be measured using a :

asked Oct 5, 2015 by meena.p

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A 2V battery is connected across AB as shown in the figure. The value of the current supplied by the battery when in one case battery 's positive terminal is connected to B will respectively be :

asked Oct 5, 2015 by meena.p

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Let $N_{\beta}$ be the number of $\beta$ particles emitted by $1\;gram$ of $Na^{24}$ radioactive nuclei (half life = 15 hrs) in $7.5$ hours , $N_{\beta}$ is close to (Avogadro number

asked Oct 5, 2015 by meena.p

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The de- Broglie wavelength associate with the electron in the $n=4$ level is :

asked Oct 5, 2015 by meena.p

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Unpolarized light of intensity $I_0$ is incident on surface of a block of gass at Brewster's angle. In that case , which one of the following statement is true ?

asked Oct 5, 2015 by meena.p

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In a Young's double slit experiment with light of wavelength $\lambda$ the separation of slits is d and distance of screen is D. Such that $D >> d >> \lambda$ . If the Fringe width is $\Beta$ the distance from point where intensity of the point where intensity falls to half of maximum intensity on either side is :

asked Oct 5, 2015 by meena.p

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A thin convex lens of focal length 'f' is put on a plane mirror as shown in the figure . When an object is kept at a distance 'a' from the lens - mirror combination , its image is formed at a distance $\large\frac{a}{3}$ in front of the combination. The value of 'a' is :

asked Oct 5, 2015 by meena.p

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For plane electromagnetic waves propagating in the z direction , which one of the following combination gives thw correct possible direction for $\overrightarrow{E} $ and $\overrightarrow{B} $ field respectively?

asked Oct 5, 2015 by meena.p

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For the LCR circuit , shown here , the current is observed to lead the applied voltage. An additional capacitor C', when joined with the capacitor C present in the circuit , makes the power factor of the circuit unity. The capacitor C', must have been connected in :

asked Oct 5, 2015 by meena.p

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A short bar magnet is placed in the magnetic meridian of the earth with north pole pointing north. Neutral points are found at a distance of $30\;cm$ from the magnet on the East - west line, drawn through the middle point of the magnet. The magnetic moment of the magnet in $Am^2$ is close to :

asked Oct 1, 2015 by meena.p

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A wire carrying current I is tied between points P and Q and is in the shape of a circular arch of radius R due to a uniform magnetic field B (perpendicular to the place of the paper, shown by xxx) in the vicinity of the wire. If the wire subtends an angle $2 \theta$ at the center of the circle(of which it forms an arch) then the tension in the wire is :

asked Oct 1, 2015 by meena.p

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Two long straight parallel wires, carrying (adjustable) currents $I_2$ and $I_2$ are kept at a distance d apart. If the force $'F'$ between the two wires is taken as 'positive' when the wires repel each other and negative when the wires attract each other , the graph showing the dependence of $'F'$, on the product $I_1,I_2$ would be :

asked Oct 1, 2015 by meena.p

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The value of the resistor , $R_s$, needed in the dc voltage regular circuit shown here, equals :

asked Oct 1, 2015 by meena.p

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In the electric network shown, no current flows through the $4 \Omega$ resistor in the arm $EB$ , the potential difference between the points A and D will be

asked Oct 1, 2015 by meena.p

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In figure is shown a system of four capacitors connected across a $10\;V$ battery . Charge that will flow from switch S When it is closed is

asked Oct 1, 2015 by meena.p

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An electric field $ \overrightarrow{E} =(25 \hat i +30 \hat j) NC^{-1}$ exists in a region of space. If the potential at the orgin is taken to be zero then the potential at $x=2\;m,y= 2\;m$ is

asked Oct 1, 2015 by meena.p

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A wire, of length $L(=20 cm) $ is bent into a semi- circular arc. If the two equal halves , of the arc, were each to be uniformly chraged with charges [ $\pm Q, |Q|=10^{3}\; \in_0$ coulomb where $\in_0$ is the permittivity (in SI units)of free space] the net electric field at the center O of the semi circular arc would be :

asked Oct 1, 2015 by meena.p

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A source of sound emits waves at frequency $f_0$ . It is moving towards an observer with fixed speed $v_s (v_s < v$, where v is the speed $v_0$, One of the following twp graphs (A and B) will give the correct variation of the frequency f heard by the observer as $v_0$ is changed . The variation f with $v_0$ is given correctly by :

asked Oct 1, 2015 by meena.p

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A pendulum with time period of 1s is losing energy due to damping. At certain time its energy is $45\;J$. If after completing 15 oscillation , its energy has become $15\;J$ its damping constant (in $s^{-1})$ is

asked Sep 30, 2015 by meena.p

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Using equipartition of energy , the specific heat $(in Jkg^{-1}K^{-})$ of aluminium at room temperature can be estimated to be (atomic weight of aluminium = 27 )

asked Sep 30, 2015 by meena.p

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An experiment takes 10 minutes to raise the temperature of water in a container from $0^{\circ}C$ to $100^{\circ}$ and another 55 minutes to convert it totally into steam by a heater supplying heat at a uniform rate . Neglecting the specific heat at a container and taking specific heat of water to be $1\;cal/g^{\circ}C$, the heat of vaporization according to this experiment will come out to be :

asked Sep 30, 2015 by meena.p

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A beaker contains a fluid of density $\rho kg/m^3$ , specific heat $SJ/kg^{\circ}C$ and viscosity $ n$ The beaker is filled up to height h. To estimate the rate of heat transfer per unit are $(Q/A)$ by convection when beaker is put on a hot plate, a student proposes that it should depend on $n$. $\bigg(\large\frac{S \Delta \theta}{h}\bigg)$ and $\bigg(\large\frac{1}{\rho g}\bigg)$ When $\Delta \theta (in \; ^{\circ}C)$ is the difference in the temperature between the bottom and top of the fluid. In that situation the correct option for $(Q/A)$ is :

asked Sep 30, 2015 by meena.p

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A cylindrical block of wood (density $= 650 \;kg\;m^{-3} )$, of base area $30\;cm^2$ and height $54\;cm$ , floats in a liquid of density $900\;kg\;m^{-3}$. The block is depressed slightly and then released . The time period of the resulting oscillations of the block would be equal to that of a simple pendulum of length (nearly)

asked Sep 30, 2015 by meena.p

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Which of the following most closely depicts the correct variation of the gravitation potential $V_{(r)}$ due to a large planet of radius R and uniform mass density ? (figures are not drawn to scale )

asked Sep 30, 2015 by meena.p

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A particle of mass $2\;kg$ is on a smooth horizontal table and moves in a circular path of radius $0.6\;m$ The height of the table from the ground is $0.8\;m$ If the angular speed of the particle is $12 rad\;s^{-1}$ the magnitude of its angular momentum about a point on the ground right under the center of the circle is :

asked Sep 30, 2015 by meena.p

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A uniform thin rod AB of length L has linear mass density $\mu(x) =a +\large\frac{bx}{L}$, Where x is measured from A. If the CM of the rod lies at a distance of $ \bigg( \large\frac{7}{12}$$L\bigg)$ from A, then a and b are related as :

asked Sep 30, 2015 by meena.p

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A particle is moving in a circle of radius r under the action of a force $F= \alpha r^2$ which is directed towards center of the circle. Total mechanical energy (kinetic energy + potential energy ) of the particle is (take potential energy =0 for r=0):

asked Sep 30, 2015 by meena.p

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A large number (n) of identical beads, each of mass m and radius r are strung on a thin smooth rigid horizontal rod of length $L (L >> r) $ and are at rest at random positions. The rod is mounted between two rigid support (see fig) . If one of the beat is now given a speed v, the average force experienced by each support after a long time is (assume all collision are elastic ):

asked Sep 30, 2015 by meena.p

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A vector $\overrightarrow{A}$ is rotated by a small angle $\Delta \theta$ radian $\Delta \theta <1) $ to get a new vector $\overrightarrow{B}$. In that case $|\overrightarrow{B} -\overrightarrow{A}| $ is :

asked Sep 30, 2015 by meena.p

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If electronic charge e, electron mass m, speed of light in vacuum c and plank's constant h are taken as fundamental quantities , the permeability of vacuum $ \mu_0$ can be expressed in units of

asked Sep 30, 2015 by meena.p

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